Andrew Orr

Climate Physicist

Biography

I work within the Atmospheric, Ice and Climate team of the British Antarctic Survey (BAS), carrying out research into the processes responsible for climate variability and change in the polar regions and the Himalayas. This is important because these regions are particularly vulnerable to a wide range of climate change impacts This is predominately achieved using regional atmosphere models and global climate models.
Research Interests

Antarctic climate change, and impacts on surface mass balance and ice shelves.
Himalayan and Andean climate change, and the impacts on hydrology.
Use of high-resolution atmospheric models over complex regions.
Dynamical mechanisms associated with Southern Hemisphere climate change in response to the ozone hole.
Mountain wave-induced polar stratospheric clouds (PSCs).

Research grants

2021-2025 Co-investigator, Polar Regions in the Earth System (PolarRES), EU Horizon 2020, £815k funded.
2019-2022 Co-investigator, Peruvian Glacier Retreat and its impact on Water Resources (Peru-GROWS), £500K funded.
2019-2021 Co-investigator, HEavy Precipitation forecast Post-processing over India (HEPPI), £300K funded.
2017-2020 Co-investigator, Polar expertise – Supporting development, NERC National Capability Overseas Development Assistance, £1.1M funded.
2017-2018 Principal-investigator, Measuring cloud properties from meteorological radiosondes in India, NERC International Development Innovation and Impact Award, £21K funded.
2016-2018 Co-investigator, Sustaining Himalayan Water Resources in a Changing Climate (SusHi-Wat), NERC Newton Sustaining Water Resources, £200k funded.
2014-2017 Co-investigator, Poles apart: why has Antarctic sea-ice increased, and why can’t coupled climate models reproduce observations?, NERC standard, £500k funded.
2014-2017 Co-investigator, Improved prediction of 21st century West Antarctic climate change: the role of the Amundsen Sea Low, NERC standard, £600k funded.
2010-2014 Principal-investigator, Modelling the effects of realistic polar stratospheric clouds on past climate and future ozone, NERC standard, £500k funded.
2010-2014 Co-investigator, The role of atmosphere-ocean-ice interactions in ice loss from Pine Island and Thwaites Glaciers, West Antarctica, NERC standard, £600k funded.
2009-2012 Co-investigator, Orographic flows and the climate of the Antarctic Peninsula (OFCAP), NERC Antarctic Finance Initiative, £500k funded.
2003 Principal-investigator, Coriolis effects in stably stratified flows with sharp changes in surface conditions, EC Integrated infrastructure initiative award to use the Coriolis turntable, Grenoble, France, £50k funded.

Supervision of students

2020-present Marc Girona-Mata (PhD) “A machine learning approach to mapping local-scale hydro-meteorological regimes in the Himalayas ” (Primary supervisor).
2019-present Jeremy Carter (PhD) “Diagnosing Antarctic ice shelf risk using coupled computational modelling” (Co-supervisor).
2016 – 2020 Ella Gilbert (PhD) “Melting of the ice shelves around the Antarctic Peninsula” (Primary supervisor).
2015-2019 Emily Potter (PhD) “What are the fundamental processes when atmospheric flow interacts with localised orography in valleys in the Himalayas” Cambridge Earth System Science NERC DTP (Primary supervisor).
2019 Aymeric Delon (Masters) “Study of mountain-wave-induced stratospheric cooling over the Antarctic Peninsula using a parameterisation scheme in the UM-UKCA chemistry climate model” (Co-supervisor).
2016-2017 Zoran Kaufmann (Masters) “The effects of ozone depletion, increased greenhouse gas emissions, and increased aerosols on precipitation in High-Mountain Asia” (Primary supervisor).
2015 Margaux Couttet (Masters) “Intercomparison of four cloud microphysics schemes in the Weather Research and Forecasting (WRF) model for the simulation of summer monsoon precipitation in Langtang Valley, Himalayas” (Primary supervisor).
2013-present Richard Jones (PhD) “Weather and climate in the Amundsen Sea Embayment, Antarctica” (Joint supervisor).
2009-2013 Andy Elvidge (PhD) “Mesoscale modelling of foehn flow across the Antarctic Peninsula” (Joint supervisor).

Previous appointments

2005-2008 Consultant, European Centre for Medium-Range Weather Forecasting (ECMWF): Researching the role of orography (resolved and sub-grid) in the ECMWF forecast system, and on the parameterisation of non-orographic gravity waves.
2001-2005 Post-doctoral researcher, University College London: Modelling of atmosphere/ocean/sea-ice processes in the polar regions.

2021

Mottram, R., N. Hansen, C. Kittel, M. van Wessem, C. Agosta, C. Amory, F. Boberg, W. J. van de Berg, X. Fettweis, A. Gossart, N. P. M. van Lipzig, E. van Meijgaard, A. Orr, T. Phillips. S. Webster, S. B. Simonsen, and N. Souverijns (2021), What is the surface mass balance of Antarctica? An intercomparison of regional climate model estimates, The Cryosphere.

Tritscher, I., M. C. Pitts, L. R. Poole, S. P. Alexander, F. Cairo, M. P. Chipperfield, J.-U. Groob, M. Hopfner, A. Lambert, B. P. Luo, S. Molleker, A. Orr, R. Salawitch, M. Snels, R. Spang, W. Woiwode, and T. Peter (2021), Polar Stratospheric Clouds: Satellite Observations, Processes, and Role in Ozone Depletion, Reviews in Geophysics.

King, J. C., J. Turner, S. Colwell, H. Lu, A. Orr, T. Phillips, and S. Hosking (2021), Inhomogeneity of the surface air temperature record from Halley, Antarctica, Journal of Climate.

2020

Orr, A., H. Lu, P. Martineau, E. P. Gerber, G. Marshall, T. Bracegirdle (2020), Is our dynamical understanding of the circulation changes associated with the Antarctic ozone hole sensitive to the choice of reanalysis dataset?, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-1288.

Orr, A., S. Hosking, A. Dellon, L. Hoffmann, R. Spang, T. Moffat-Griffin, J. Keeble, L. Abraham, and P. Braesicke (2020), PSCs initiated by mountain waves in a global chemistry-climate model: A missing piece in fully modelling polar stratospheric ozone depletion, Atmos. Chem. Phys., 20, 12,483-12,497, https://doi.org/10.5194/acp-20-12483-2020.

Potter, E., A. Orr, I. Willis, D. Bannister, and P. Wagnon (2020), Meteorological impacts of a novel debris-covered glacier category in a regional climate model across a Himalayan catchment, Atmos. Sci. Lett., https://doi.org/10.1002/asl.1018.

Gilbert, E., A. Orr, J. King, I. Renfrew, T. Lachlan-Cope, P. Field, and I. Boutle (2020), Summertime cloud phase strongly influences surface melting on the Larsen C ice shelf Antarctica, Q. J. Roy. Met. Soc., 146, 1575-1589, https://doi.org/10.1002/qj.3753.

Pope, J., A. Orr, G. J. Marshall, and N. L. Abraham (2020), Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry, Atmos. Sci. Lett., https://doi.org/10.1002/asl.1004.

Sedlar, J., M. Tjernstrom, A. Rinke, A. Orr, J. Cassano, X. Fetweis, G. Heinemann, M. Seefeldt, A. Solomon, H. Matthes, T. Phillips, and S. Webster (2020), Confronting Arctic troposphere, clouds, and surface energy budget representations in regional climate models with observations, J. Geophys. Res., 125, https://doi.org/10.1029/2019JD031783.

Inoue, J., K. Sato, A. Rinke, J. J. Cassano, X. Fettweis, G. Heinemann, H. Matthes, A. Orr, T. Phillips, M. Seefeldt, A. Solomon, and S. Webster (2020), Clouds and radiation processes in regional climate models evaluated using observations over the ice-free Arctic Ocean, J. Geophys. Res., https://doi.org/10.1029/2020JD033904.

Dell, R., N. Arnold, I. Willis, A. Banwell, A. Williamson, H. Pritchard, and A. Orr (2020), Lateral meltwater transfer across an Antarctic ice shelf’, The Cryosphere, 14, 2313–2330, https://doi.org/10.5194/tc-14-2313-2020.

2019

Bannister, D., A. Orr, S. K. Jain, I. P. Holman, A. Momblanch, T. Phillips, A. J. Adeloye, B. Snapir, T. W. Waine, J. S. Hosking, and C. Allen-Sadler (2019), Bias correction of high‐resolution regional climate model precipitation output gives the best estimates of precipitation in Himalayan catchments, J. Geophys. Res., 124, 14,220–14,239, https://doi.org/10.1029/2019JD030804.

Bannister, D., A. Orr, and T. Phillips, Model‐simulated and bias‐corrected daily total precipitation from a reanalysis‐driven Weather Research and Forecasting simulation of the Beas and Sutlej river basins in the Himalaya, 1980 to 2012 (Version 1.0) [Data set], UK Polar Data Center, Natural Environment Research Council, UK Research & Innovation, https://doi.org/10.5285/74fab393-2718-4bdb-b229-190ae72a9fe1.

Gumber, S., S. Ghosh, A. Orr, S. Kumar, and J. Pope (2019), On the microphysical processing of aged combustion aerosols impacting warm rain microphysics over Asian megacities, Theor. Appl. Climatol., 139, 1479-1491, https://doi.org/10.1007/s00704-019-03042-0.

Prasad, V., A. V. Kulkarni, S. Pradeep, S. Pratibha, S. A. Tawde, T. Shirsat, A. R. Arya, A. Orr, and D. Bannister (2019), Large losses in glacier area and water availability by the end of the century under high greenhouse gas emission scenario, Satluj basin, Himalaya, Curr. Sci., 116, 1721-1730, https://doi.org/10.18520/cs/v116/i10/1721-1730.

Gerber, E. P., P. Martineau, B. Ayarzaguena, D. Barriopedro, T. J. Bracegirdle, A. H. Butler, N. Calvo, S. C. Hardiman, P. Hitchcock, M. Iza, U. Langematz, H. Lua, G. Marshall, A. Orr, F. M. Palmeiro, S.-W. Son, and M. Taguchi (2019), Extratropical Stratosphere–troposphere Coupling, Stratosphere-troposphere Processes and their Role in Climate (SPARC) Reanalysis Intercomparison Project (S-RIP) Chapter 6, M. Fujiwara, G. L. Manney, L. Gray, and J. S. Wright, Eds.

2018

Clem, K., A. Orr, and J. Pope (2018), The Springtime Influence of Natural Tropical Pacific Variability on the Surface Climate of the Ross Ice Shelf, West Antarctica: Implications for Ice Shelf Thinning, Sci. Rep., 8, https://doi.org/10.1038/s41598-018-30496-5.

Deb., P., A. Orr, D. H. Bromwich, J. P. Nicholas, J. Turner, and J. S. Hosking (2018), Summer drivers of atmospheric variability affecting ice shelf thinning in the Amundsen Sea Embayment, West Antarctica, Geophys. Res. Lett., 45, 4124-4133, https://doi.org/10.1029/2018GL077092.

Potter, E. R., A. Orr, I. C. Willis, D. Bannister, and F. Salerno (2018), Dynamical drivers of the local wind regime in a Himalayan valley, J. Geophys. Res., https://doi.org/10.1029/2018JD029427.

Widmann, M., R. Blake, K.P. Sooraj, A. Orr, J. Sanjay, A. Karumuri, A. K Mitra, E. N. Rajagopal, A .F. Van Loon, D. M. Hannah, N. Barrand, R. Singh, V. Mishra, F. Sugden, and D. S. Arya (2018), Current Opportunities and Challenges in Developing Hydro-Climatic Services in the Himalayas: Report of India-UK Water Center Pump Priming Project 2017, Center for Ecology & Hydrology, Wallingford and Indian Institute of Tropical Meteorology, Pune.

Spang, R., L. Hoffmann, R. Muller, J.-U. Groob, I. Tritscher, M. Hopfner, M. Pitts, A. Orr, and M. Riese (2018), A climatology of polar stratospheric cloud composition between 2002 and 2012 based on MIPAS/Envisat observations, Atmos. Chem. Phys., 18, 5089-5113, https://doi.org/10.5194/acp-18-5089-2018.

Kuipers Munneke, P., A. J. Luckman, S. L. Bevan, C. J. P. P. Smeets, E. Gilbert, M. R. van den Broeke, W. Wang, C. Zender, B. Hubbard, D. Ashmore, A. Orr, and J. C. King (2018), Intense winter surface melt on an Antarctic ice shelf’, Geophys. Res. Lett., 45, https://doi.org/10.1029/2018GL077899.

2017

Orr, A., C. Listowski, M. Couttet, E. Collier, W. Immerzeel, P. Deb, and D. Bannister (2017), Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya to cloud microphysics schemes in WRF, J. Geophys. Res., 122, 6298-6318, https://doi.org/10.1002/2016JD025801

Orr, A., (2017), Regional climate downscaling through the Antarctic CORDEX project, World Meteorological Organization Antarctic Treaty Paper.

Turner, J., A. Orr, H. Gudmundsson, A. Jenkins, R. G. Bingham, C.-D. Hilenbrand, and T. J. Bracegirdle (2017), Atmosphere-ocean-ice interactions in the Amundsen Sea Embayment, West Antarctica, Rev. Geophys., 55, 235-276, https://doi.org/10.1002/2016RG000532.

Alexander, S., A. Orr, S. Webster, and D. Murphy (2017), Observations and fine-scale model simulations of gravity waves over Davis, East Antarctica (69S, 78E), J. Geophys. Res., 122, 7355-7370, https://doi.org/10.1002/2017JD026615.

Hoffman, L., R. Spang, A. Orr, M. J. Alexander, L. A. Holt, and O. Stein (2017), A decadal satellite record of gravity wave activity to study polar stratospheric cloud formation, Atmos. Chem. Phys., 17, 2901-2920, https://doi.org/10.5194/acp-17-2901-2017.

Pope, J. O., P. R. Holland, A. Orr, G. J. Marshall, and T. Phillips (2017), The impacts of El Niño on the observed sea ice budget of West Antarctica, Geophys. Res. Lett., 44, 6200-6208, https://doi.org/10.1002/2017GL073414.

Zhang, X., T. Jung, M. Wang, Y. Luo, T. Semmler, and A. Orr (2017), Preface to the special issue: Towards improving understanding and prediction of Arctic change and its linkage with Eurasian mid-latitude weather and climate, Adv. Atmos. Sci., 35, 1-4, https://doi.org/10.1007/s00376-017-7004-7.

Moffat-Griffin, T., M. J. Taylor, T. Nakamura, A. J. Kavanagh, J. S. Hosking, and A. Orr (2017), 3rd Antarctic Gravity Wave Instrument Network (ANGWIN) science workshop, Adv. Atmos. Sci., 32, 1-3, https://doi.org/10.1007/s00376-016-6197-5.

King, J., A. Kirchgaessner, S. Bevan, A. D. Elvidge, P. Kuipers Munneke, A. Luckman, A. Orr, I. A. Renfrew, M. R. van den Broeke (2017), The impacts of fohn winds on surface energy balance during the 2010-2011 melt season over Larsen C Ice Shelf, Antarctica, J. Geophys. Res., 122, 12,062-12,076, https://doi.org/10.1002/2017JD026809.

Bramberger, M., A. Dornbrack, K. Bossert, B. Ehard, D. C. Fritts, B. Kaifler, C. Mallaun, A. Orr, P.-D. Pautet, M. Rapp, M. J. Taylor, S. Vosper, B. P. Williams, and B. Witschas (2017), Does strong tropospheric forcing cause large-amplitude mesospheric gravity waves? – A DEEPWAVE case study, J. Geophys. Res., 122, 11,422– 11,443, https://doi.org/10.1002/2017JD027371.

2016

Hosking, S., A. Orr, T. Bracegirdle, and J. Turner (2016), Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing, Geophys. Res. Lett., 43, 367-376, https://doi.org/10.1002/2015GL067143.

Deb, P., A. Orr, J. S. Hosking, T. Phillips, J. Turner, D. Bannister, J. Pope, and S. Colwell (2016), An assessment of the Polar WRF representation of near-surface meteorological variables over West Antarctica, J. Geophys. Res., 121, 1532-1548, https://doi.org/10.1002/2015JD024037.

Jones, R. W., I. A. Renfrew, A. Orr, B. G. M. Webber, D. M. Holland, and M. A. Lazzara (2016), Evaluation of four global reanalysis products using in situ observations in the Amundsen Sea Embayment, Antarctica, J. Geophys. Res., 121, 6240-6257, https://doi.org/10.1002/2015JD024680.

Elvidge, A., I. Renfrew, J. King, A. Orr, and T. A. Lachlan-Cope (2016), Foehn warming distributions in non-linear and linear flow regimes: A focus on the Antarctic Peninsula, Q. J. Roy. Met. Soc., 142, 618-631, https://doi.org/10.1002/qj.2489.

Spang, R., L. Hoffmann, M. Hopfner, S. Griessbach, R Muller, M. C. Pitts, A. Orr, and M. Riese (2016), A multi-wavelength classification method for polar stratospheric cloud types using infrared limb spectra, Atmos. Meas. Tech., 9, 3619-3639, https://doi.org/10.5194/amt-9-3619.

2015

Orr, A., J. S. Hosking, L. Hoffmann, J. Keeble, S. M. Dean, H. K. Roscoe, L. Abraham, S. Vosper, and T. Phillips (2015), Inclusion of mountain wave-induced cooling for the formation of PSCs over the Antarctic Peninsula in a chemistry-climate model, Atmos. Chem. Phys., 15, 1071-1086, https://doi.org/10.5194/acp-15-1071-2015.

Orr, A. and J. C. R. Hunt (2015), Wind jets and associated variations in cloudiness along coastlines and in valleys associated with Coriolis effects, Met Office Forecast Handbook, 2015.

Elvidge, A., I. Renfrew, J. King, A. Orr, T. A. Lachlan-Cope, M. Weeks, and S. L. Gray (2014), Foehn jets over the Larsen C Ice Shelf, Antarctica, Q. J. Roy. Met. Soc., 141, 698-713, https://doi.org/10.1002/qj.2382.

King, J. C., A. Gadian, A. Kirchgaessner, P. Kuipers Munneke, T. A. Lachlan-Cope, A. Orr, C. Reijmer, M. R. van den Broeke, J. M. van Wessem, and M. Weeks (2015), Validation of the summertime surface energy budget of Larsen C Ice Shelf (Antarctica) as represented in three high-resolution atmospheric models, J. Geophys. Res., https://doi.org/10.1002/2014JD022604.

2014

Orr, A., T. Phillips, S. Webster, A. Elvidge, M. Weeks, S. J. Hosking, and J. Turner (2014), Met Office Unified Model high resolution simulations of a strong wind event in Antarctica, Q. J. Roy. Met. Soc., 140, 2287-2297, https://doi.org/10.1002/qj.2296.

Hosking, J. S., D. Bannister, A. Orr, J. King, E. Young, and T. Phillips (2014), Orographic forcing of surface winds over the shelf waters adjacent to South Georgia, Atmos. Sci. Lett., 16, 50-55, https://doi.org/10.1002/asl2.519.

2013

Orr, A., T. J. Bracegirdle, J. S. Hoskings, W. Feng, H. Roscoe, and J. D. Haigh (2013), Strong dynamical modulation of the cooling of the polar stratosphere associated with the Antarctic ozone hole, J. Climate, 26, 662-668, https://doi.org/10.1175/JCLI-D-12-00480.1.

Orr, A. (2013), Mesoscale modelling method development in the offshore wind accelerator program: Comparison of UM and HIRLAM models, Cambridge Environmental Research Consultants, Cambridge, UK.

Hosking, J. S., A. Orr, G. J. Marshall, J. Turner, and T. Phillips (2013), The influence of the Amundsen-Bellingshausen Seas Low on the climate of West Antarctica and its representation in coupled climate model simulations, J. Climate, 26, 6633-6648, https://doi.org/10.1175/JCLI-D-12-00813.1.

Marshall, G. J., A. Orr, and J. Turner (2013), A predominant reversal in the relationship between the SAM and East Antarctic temperatures during the 21st Century, J. Climate, 26, 5196-5204, https://doi.org/10.1175/JCLI-D-12-00671.1.

2012

Orr, A., T. J. Bracegirdle, J. S. Hoskings, T. Jung, J. D. Haigh, T. Phillips, and W. Feng (2012), Possible dynamical mechanisms for Southern Hemisphere climate change due to the ozone hole, J. Atmos. Sci., 69, 2917-2932, https://doi.org/10.1175/JAS-D-11-0210.1.

Turner, J., T. Phillips, J. S. Hosking, G. J. Marshall, and A. Orr (2012), The Amundsen Sea low, Int. J. Climatol., https://doi.org/10.1002/joc.3558.

2010

Orr, A., P. Bechtold, J. Scinocca, M. Ern, and M. Janiskova (2010), Improved middle atmosphere climate and forecasts in the ECMWF model through a non-orographic gravity wave drag parametrization, J. Climate, 23, 5905-5926, https://doi.org/10.1175/2010JCLI3490.1.

Jung, T., G. Balsamo, P. Bechtold, A. C. M. Beljaars, M. Kohler, M. J. Miller, J.-J. Morcrette, A. Orr, M. J. Rodwell, and A. M. Tomkins (2010), The ECMWF model climate: Recent progress through improved physical parametrizations, Q. J. Roy. Met. Soc., 136, 1145-1160, https://doi.org/10.1002/qj.634.

2009

Orr, A., and P. Bechtold (2009), Improvement in the capturing of short-range warm season orographic precipitation in the ECMWF model, Meteorol. Atmos. Phys., 103, 15-23, https://doi.org/10.1007/s00703-008-0288-5.

Orr, A., (2009), The representation of non-orographic gravity waves in the IFS Part II: A physically based spectral parametrization, ECMWF technical memo no. 593, ECMWF, Reading, UK, doi: 10.21957/jpko88tx6, https://www.ecmwf.int/node/11446.

Orr, A., and N. Wedi (2009), The representation of non-orographic gravity waves in the IFS Part I: Assessment of the middle atmosphere climate with Rayleigh friction, ECMWF technical memo no. 592, ECMWF, Reading, UK, doi: 10.21957/45nr8vsb, https://www.ecmwf.int/node/11447.

Turner, J., S. N. Chenoli, A. abu Samah, G. Marshall, T. Phillips, and A. Orr (2009), Strong wind events in the Antarctic, J. Geophys. Res., 114, D18103, https://doi.org/10.1029/2008JD011642.

Turner, J., J. C. Comiso, G. J. Marshall, T. A. Lachlan-Cope, T. Bracegirdle, T. Maksym, M. P. Meredith, Z. Wang, and A. Orr (2009), Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent, Geophys. Res. Lett., 36, L08502, https://doi.org/10.1029/2009GL037524.

Turner, J., P. Anderson, T. Lachlan-Cope, S. Colwell, T. Phillips, A. Kirchgaessner, G. J. Marshall, J. C. King, T. J. Bracegirdle, D. G. Vaughan, V. Lagun, and A. Orr (2009), Record low surface air temperature at Vostock station, Antarctica’, J. Geophys. Res., 114, D24102, https://doi.org/10.1029/2009JD012104.

2008

Orr, A., G. J. Marshall, J. C. R. Hunt, J. Sommeria, C. Wang, N. van Lipzig, D. Cresswell, and J. C. King (2008), Characteristics of airflow over the Antarctic Peninsula and its response to recent strengthening of westerly circumpolar winds, J. Atmos. Sci., 65, 1396-1413, https://doi.org/10.1175/2007JAS2498.1.

Van Lipzig, N. P. M., G. J. Marshall, A. Orr, and J. C. King (2008), The relationship between the southern hemisphere annular mode and Antarctic Peninsula summer temperatures: Analysis of a high-resolution model, J. Climate, 21, 1649–1668, https://doi.org/10.1175/2007JCLI1695.1.

2007

Orr, A., (2007), Evaluation of revised parameterization of sub-grid orographic drag’, ECMWF technical memo no. 536, ECMWF, Reading, UK, doi:10.21957/1yye3n6ik, https://www.ecmwf.int/node/11452.

2006

Marshall, G. J., A. Orr, N. van Lipzig, and J. C. King (2006), The impact of a changing Southern Hemisphere Annular Mode on Antarctic Peninsula summer temperatures, J. Climate, 19, 5388-5404, https://doi.org/10.1175/JCLI3844.1.

2005

Orr, A., J. C. R. Hunt, R. Capon, J. Sommeria, D. Cresswell, and A. Owinoh (2005), Coriolis effects on wind jets and cloudiness along coasts, Weather, 60, 291-299, https://doi.org/10.1256/wea.219.04.

Orr, A., E. Hanna, J. C. R. Hunt, J. Cappelen, K. Steffen, and A. Stephens (2005), Characteristics of stable flows over Southern Greenland, Pure Appl. Geophys., 162, 1747-1778, https://doi.org/10.1007/s00024-005-2691-x.

Owinoh, A., J. C. R. Hunt, A. Orr, P. Clark, R. Klein, H. J. S. Fernando, and F. T. N. Nieuwstadt (2005), Effects of changing surface heat flux on the atmospheric boundary layer flow over flat terrain, Bound.-Layer Meteorol., 116, 331-361, https://doi.org/10.1007/s10546-004-2819-z.

2004

Orr, A., D. Cresswell, G. J. Marshall, J. C. R. Hunt, J. Sommeria, C. G. Wang, and M. Light (2004), A ‘low-level’ explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation, Geophys. Res. Lett., 31, L06204, https://doi.org/10.1029/2003GL019160.

Hunt, J. C. R., A. Orr, J. W. Rottman, and R. Capon (2004), Coriolis effects in mesoscale flows with sharp changes in surface conditions, Q. J. Roy. Met. Soc., 130, 2703-2731, https://doi.org/10.1256/qj.04.14.

2003

Hunt, J. C. R., A. Orr, D. Cresswell, and A. Owinoh (2003), Coriolis effects in mesoscale shallow layer flows, Proceedings of the International Symposium on Shallow Flows (Eds. G. H. Jirka and W. S. J. Uijttewaal), Delft, June 16-18, 117-124.

Publications from NERC Open Research Archive

2021

Tritscher, I., Pitts, M. C., Poole, L. R., Alexander, S. P., Cairo, F., Chipperfield, M. P., Grooß, J.‐U., Höpfner, M., Lambert, A., Luo, B. P., Molleker, S., Orr, A. , Salawitch, R., Snels, M., Spang, R., Woiwode, W., Peter, T.. (2021) Polar stratospheric clouds satellite observations, processes, and role in ozone depletion. Reviews of Geophysics. 10.1029/2020RG000702

King, John C., Turner, John , Colwell, Steve, Lu, Hua , Orr, Andrew , Phillips, Tony , Hosking, J. Scott , Marshall, Gareth J. . (2021) Inhomogeneity of the surface air temperature record from Halley, Antarctica. Journal of Climate, 34. 45 pp. 10.1175/JCLI-D-20-0748.1

Potter, Emily R. , Orr, Andrew , Willis, Ian C., Bannister, Daniel , Wagnon, Patrick. (2021) Meteorological impacts of a novel debris-covered glacier category in a regional climate model across a Himalayan catchment. Atmospheric Science Letters, 22. 12 pp. 10.1002/asl.1018

Inoue, Jun, Sato, Kazutoshi, Rinke, Annette, Cassano, John J., Fettweis, Xavier, Heinemann, Günther, Matthes, Heidrun, Orr, Andrew , Phillips, Tony , Seefeldt, Mark, Solomon, Amy, Webster, Stuart. (2021) Clouds and radiation processes in regional climate models evaluated using observations over the ice‐free Arctic Ocean. Journal of Geophysical Research: Atmospheres, 126. 25 pp. 10.1029/2020JD033904

2020

Orr, Andrew , Lu, Hua , Martineau, Patrick, Gerber, Ed P., Marshall, Gareth , Bracegirdle, Tom J. . (2020) Is our dynamical understanding of the circulation changes associated with the Antarctic ozone hole sensitive to the choice of reanalysis dataset? [in review]. Atmospheric Chemistry and Physics Discussions. 10.5194/acp-2020-1288

Pope, James , Orr, Andrew , Marshall, Gareth , Abraham, Nathan Luke. (2020) Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry. Atmospheric Science Letters, 21. 10.1002/asl.1004

Orr, Andrew , Hosking, J. Scott , Delon, Aymeric, Hoffman, Lars, Spang, Reinhold, Moffat-Griffin, Tracy , Keeble, James, Abraham, Nathan Luke, Braesicke, Peter. (2020) Polar stratospheric clouds initiated by mountain waves in a global chemistry–climate model: a missing piece in fully modelling polar stratospheric ozone depletion. Atmospheric Chemistry and Physics, 20. 15 pp. 10.5194/acp-20-12483-2020

Dell, Rebecca, Arnold, Neil, Willis, Ian, Banwell, Alison, Williamson, Andrew, Pritchard, Hamish , Orr, Andrew . (2020) Lateral meltwater transfer across an Antarctic ice shelf.. The Cryosphere, 14. 18 pp. 10.5194/tc-14-2313-2020

Gilbert, Ella , Orr, Andrew , King, John C., Renfrew, I.A., Lachlan-Cope, Thomas , Field, P.F., Boutle, I.A.. (2020) Summertime cloud phase strongly influences surface melting on the Larsen C ice shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 146. 1575-1589. 10.1002/qj.3753

Gumber, Siddarth, Ghosh, Sat, Orr, Andrew , Kumar C.R., Sathish, Pope, James . (2020) On the microphysical processing of aged combustion aerosols impacting warm rain microphysics over Asian megacities. Theoretical and Applied Climatology, 139. 1479-1491. 10.1007/s00704-019-03042-0

2019

Bannister, Daniel, Orr, Andrew , Jain, Sanjay K., Holman, Ian P., Momblanch, Andrea, Phillips, Tony , Adeloye, Adebayo J., Snapir, Boris, Waine, Toby W., Hosking, Scott , Allen-Sader, Clare. (2019) Bias correction of high-resolution regional climate model precipitation output gives the best estimates of precipitation in Himalayan catchments. Journal of Geophysical Research: Atmospheres, 124. 20 pp. 10.1029/2019JD030804

Prasad, Veena, Kulkarni, Anil V., Pradeep, S., Pratibha, S., Tawde, Sayli A., Shirsat, Tejal, Arya, A.R., Orr, Andrew , Bannister, Daniel . (2019) Large losses in glacier area and water availability by the end of the twenty-first century under high emission scenario, Satluj basin, Himalaya. Current Science, 116. 1721-1730. 10.18520/cs/v116/i10/1721-1730

2018

Potter, Emily R. , Orr, Andrew , Willis, Ian C., Bannister, Daniel , Salerno, Franco. (2018) Dynamical drivers of the local wind regime in a Himalayan valley. Journal of Geophysical Research: Atmospheres, 123. 13186-13202. 10.1029/2018JD029427

Clem, Kyle R., Orr, Andrew , Pope, James O. . (2018) The springtime influence of natural tropical Pacific variability on the surface climate of the Ross Ice Shelf, West Antarctica: implications for ice shelf thinning. Scientific Reports, 8. 10.1038/s41598-018-30496-5

Kuipers Munneke, P., Luckman, A.J., Bevan, S.L., Smeets, C.J.P.P., Gilbert, Ella , van den Broeke, M.R., Wang, W., Zender, C., Hubbard, B., Ashmore, D., Orr, Andrew , King, John C., Kulessa, B.. (2018) Intense winter surface melt on an Antarctic ice shelf. Geophysical Research Letters, 45. 7615-7623. 10.1029/2018GL077899

Deb, Pranab, Orr, Andrew , Bromwich, David H., Nicolas, Julien P., Turner, John , Hosking, J. Scott . (2018) Summer drivers of atmospheric variability affecting ice shelf thinning in the Amundsen Sea Embayment, West Antarctica. Geophysical Research Letters, 45. 4124-4133. 10.1029/2018GL077092

Spang, Reinhold, Hoffmann, Lars, Müller, Rolf, Grooß, Jens-Uwe, Tritscher, Ines, Höpfner, Michael, Pitts, Michael, Orr, Andrew , Riese, Martin. (2018) A climatology of polar stratospheric cloud composition between 2002 and 2012 based on MIPAS/Envisat observations. Atmospheric Chemistry and Physics, 18. 5089-5113. 10.5194/acp-18-5089-2018

Zhang, Xiangdong, Jung, Thomas, Wang, Muyin, Luo, Yong, Semmler, Tido, Orr, Andrew . (2018) Preface to the special issue: Towards improving understanding and prediction of Arctic change and its linkage with Eurasian mid-latitude weather and climate. Advances in Atmospheric Sciences, 35. 1-4. 10.1007/s00376-017-7004-7

2017

Bramberger, Martina, Dörnbrack, Andreas, Bossert, Katrina, Ehard, Benedikt, Fritts, David C., Kaifler, Bernd, Mallaun, Christian, Orr, Andrew , Pautet, P.-Dominique, Rapp, Markus, Taylor, Michael J., Vosper, Simon, Williams, Bifford P., Witschas, Benjamin. (2017) Does Strong Tropospheric Forcing Cause Large-Amplitude Mesospheric Gravity Waves? A DEEPWAVE Case Study. Journal of Geophysical Research: Atmospheres, 122. 11,422-11,443. 10.1002/2017JD027371

King, J.C., Kirchgaessner, A. , Bevan, S., Elvidge, A.D., Kuipers Munneke, P., Luckman, A., Orr, A. , Renfrew, I.A., van den Broeke, M.R.. (2017) The impact of föhn winds on surface energy balance during the 2010-11 melt season over Larsen C Ice Shelf, Antarctica. Journal of Geophysical Research: Atmospheres, 122. 12062-12076. 10.1002/2017JD026809

Alexander, S.P., Orr, A. , Webster, S., Murphy, D. J.. (2017) Observations and fine-scale model simulations of gravity waves over Davis, East Antarctica (69°S, 78°E). Journal of Geophysical Research: Atmospheres, 122. 7355-7370. 10.1002/2017JD026615

Orr, A. , Listowski, C., Couttet, M., Collier, E., Immerzeel, W., Deb, P., Bannister, D. . (2017) Sensitivity of simulated summer monsoonal precipitation in Langtang Valley, Himalaya to cloud microphysics schemes in WRF. Journal of Geophysical Research: Atmospheres, 122. 6298-6318. 10.1002/2016JD025801

Pope, James O. , Holland, Paul R. , Orr, Andrew , Marshall, Gareth J. , Phillips, Tony . (2017) The impacts of El Niño on the observed sea ice budget of West Antarctica. Geophysical Research Letters, 44. 6200-6208. 10.1002/2017GL073414

Turner, John , Orr, Andrew , Gudmundsson, G. Hilmar , Jenkins, Adrian , Bingham, Robert G., Hillenbrand, Claus-Dieter , Bracegirdle, Thomas J. . (2017) Atmosphere-ocean-ice interactions in the Amundsen Sea Embayment, West Antarctica. Reviews of Geophysics, 55. 235-276. doi:10.1002/2016RG000532

Hoffmann, Lars, Spang, Reinhold, Orr, Andrew , Alexander, M. Joan, Holt, Laura A., Stein, Olaf. (2017) A decadal satellite record of gravity wave activity in the lower stratosphere to study polar stratospheric cloud formation. Atmospheric Chemistry and Physics, 17. 2901-2920. doi:10.5194/acp-17-2901-2017

Moffat-Griffin, Tracy , Taylor, Mike J., Nakamura, Takuji, Kavanagh, Andrew J. , Hosking, J. Scott , Orr, Andrew . (2017) 3rd ANtarctic Gravity Wave Instrument Network (ANGWIN) science workshop. Advances in Atmospheric Sciences, 34. 1-3. doi:10.1007/s00376-016-6197-5

2016

Spang, Reinhold, Hoffmann, Lars, Höpfner, Michael, Griessbach, Sabine, Müller, Rolf, Pitts, Michael C., Orr, Andrew M.W. , Riese, Martin. (2016) A multi-wavelength classification method for polar stratospheric cloud types using infrared limb spectra. Atmospheric Measurement Techniques, 9. 3619-3639. doi:10.5194/amt-9-3619-2016

Jones, R. W., Renfrew, I. A., Orr, A. , Webber, B. G. M., Holland, D. M., Lazzara, M. A.. (2016) Evaluation of four global reanalysis products using in-situ observations in the Amundsen Sea Embayment, Antarctica. Journal of Geophysical Research: Atmospheres, 121. 6240-6257. doi:10.1002/2015JD024680

Deb, Pranab, Orr, Andrew , Hosking, J. Scott , Phillips, Tony , Turner, John , Bannister, Daniel, Pope, James O. , Colwell, Steve. (2016) An assessment of the Polar Weather Research and Forecast (WRF) model representation of near-surface meteorological variables over West Antarctica. Journal of Geophysical Research - Atmospheres, 121. 1532-1548. 10.1002/2015JD024037

Hosking, J. Scott , Orr, Andrew , Bracegirdle, Thomas J. , Turner, John . (2016) Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing. Geophysical Research Letters, 43. 367-376. 10.1002/2015GL067143

Elvidge, Andrew D., Renfrew, Ian A., King, John C., Orr, Andrew , Lachlan-Cope, Tom A. . (2016) Foehn warming distributions in non-linear and linear flow regimes: A focus on the Antarctic Peninsula. Quarterly Journal of the Royal Meteorological Society, 142. 618-631. doi:10.1002/qj.2489

2015

Elvidge, Andrew D., Renfrew, Ian A., King, John C., Orr, Andrew , Lachlan-Cope, Tom A. , Weeks, Mark, Gray, Sue L.. (2015) Foehn jets over the Larsen C Ice Shelf, Antarctica. Quarterly Journal of the Royal Meteorological Society, 141. 698-713. 10.1002/qj.2382

King, J.C., Gadian, A., Kirchgaessner, A. , Kuipers Munneke, P., Lachlan-Cope, T.A. , Orr, A. , Reijmer, C., van den Broeke, M.R., van Wessem, J.M., Weeks, M.. (2015) Validation of the summertime surface energy budget of Larsen C Ice Shelf (Antarctica) as represented in three high-resolution atmospheric models. Journal of Geophysical Research: Atmospheres, 120. 1335-1347. 10.1002/2014JD022604

Orr, A. , Hosking, J.S. , Hoffmann, L., Keeble, J., Dean, S.M., Roscoe, H.K., Abraham, N.L., Vosper, S., Braesicke, P.. (2015) Inclusion of mountain wave-induced cooling for the formation of PSCs over the Antarctic Peninsula in a chemistry-climate model. Atmospheric Chemistry and Physics, 15. 1071-1086. 10.5194/acp-15-1071-2015

Hosking, J. Scott , Bannister, Daniel, Orr, Andrew , King, John, Young, Emma , Phillips, Tony . (2015) Orographic disturbances of surface winds over the shelf waters adjacent to South Georgia. Atmospheric Science Letters, 16. 50-55. doi:10.1002/asl2.519

2014

Orr, Andrew , Phillips, Tony , Webster, Stuart, Elvidge, Andy, Weeks, Mark, Hosking, Scott , Turner, John . (2014) Met Office unified model high resolution simulations of a strong wind event in Antarctica. Quarterly Journal of the Royal Meteorological Society, 140. 2287-2297. 10.1002/qj.2296

Meredith, Michael , Orr, Andrew , Shanklin, Jonathan, Turner, John , [and 126 others], . Ennis, Christine A. (eds.). (2014) Assessment for Decision-Makers: Scientific Assessment of Ozone Depletion: 2014. Geneva, Switzerland, World Meteorological Organization, 46 pp. (Global Ozone Research and Monitoring Project Report No. 56.)

2013

Hosking, J. Scott , Orr, Andrew , Marshall, Gareth J. , Turner, John , Phillips, Tony . (2013) The influence of the Amundsen–Bellingshausen Seas low on the climate of West Antarctica and its representation in coupled climate model simulations. Journal of Climate, 26. 6633-6648. doi:10.1175/JCLI-D-12-00813.1

Marshall, Gareth J. , Orr, Andrew , Turner, John . (2013) A predominant reversal in the relationship between the SAM and East Antarctic temperatures during the Twenty-First Century. Journal of Climate, 26. 5196-5204. 10.1175/JCLI-D-12-00671.1

Turner, John , Phillips, Tony , Hosking, J. Scott , Marshall, Gareth J. , Orr, Andrew . (2013) The Amundsen Sea low. International Journal of Climatology, 33. 1818-1829. doi:10.1002/joc.3558

Orr, Andrew , Bracegirdle, Thomas J. , Hosking, J. Scott , Feng, Wuhu, Roscoe, Howard K., Haigh, Joanna D.. (2013) Strong dynamical modulation of the cooling of the polar stratosphere associated with the Antarctic ozone hole. Journal of Climate, 26. 662-668. doi:10.1175/JCLI-D-12-00480.1

2012

Orr, Andrew , Bracegirdle, Thomas J. , Hosking, J. Scott , Jung, Thomas, Haigh, Joanna D., Phillips, Tony , Feng, Wuhu. (2012) Possible dynamical mechanisms for Southern Hemisphere climate change due to the ozone hole. Journal of the Atmospheric Sciences, 69. 2917-2932. 10.1175/JAS-D-11-0210.1

2010

Jung, T., Balsamo, G., Bechtold, P., Beljaars, A.C.M., Köhler, M., Miller, M.J., Morcrette, J.-J., Orr, A. , Rodwell, M.J., Tompkins, A.M.. (2010) The ECMWF model climate: Recent progress through improved physical parametrizations. Quarterly Journal of the Royal Meteorological Society, 136. 1145-1160. 10.1002/qj.634

2009

Turner, John , Comiso, Josefino C., Marshall, Gareth J. , Lachlan-Cope, Tom A. , Bracegirdle, Toms , Maksym, Ted, Meredith, Michael P. , Wang, Zhaomin , Orr, Andrew . (2009) Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent. Geophysical Research Letters, 36. 5 pp. 10.1029/2009GL037524

Turner, John , Chenoli, Sheeba Nettukandy, abu Samah, Azizan, Marshall, Gareth , Phillips, Tony , Orr, Andrew . (2009) Strong wind events in the Antarctic. Journal of Geophysical Research, 114. 25 pp. 10.1029/2008JD011642

Turner, John , Anderson, Philip, Lachlan-Cope, Thomas , Colwell, Steven, Phillips, Tony , Kirchgaessner, Amelie , Marshall, Gareth , King, John, Bracegirdle, Thomas , Vaughan, David , Lagun, V, Orr, Andrew . (2009) Record low surface air temperature at Vostok Station, Antarctica. Journal of Geophysical Research: Atmospheres, 114. 14 pp. 10.1029/2009JD012104

2008

Orr, Andrew , Marshall, Gareth J. , Hunt, Julian C.R., Sommeria, Joel, Wang, Chang-Gui, Van Lipzig, Nicole P.M., Cresswell, Doug, King, John C.. (2008) Characteristics of summer airflow over the Antarctic Peninsula in response to recent strengthening of westerly circumpolar winds. Journal of the Atmospheric Sciences, 65. 1396-1413. 10.1175/2007JAS2498.1

Van Lipzig, Nicole P.M., Marshall, Gareth J. , Orr, Andrew , King, John C.. (2008) The relationship between the Southern Hemisphere Annular Mode and Antarctic Peninsula summer temperatures: analysis of a high-resolution model climatology. Journal of Climate, 21. 1649-1668. 10.1175/2007JCLI1695.1

2004

Orr, A. , Cresswell, D., Marshall, G.J. , Hunt, J.C.R., Sommeria, J., Wang, C.G., Light, M.. (2004) A ‘low-level’ explanation for the recent large warming event trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation. Geophysical Research Letters, 31. 4 pp. 10.1029/2003GL019160

2018

“Hairdryer winds” cause ice melt during Antarctic winter
News 3 May, 2018

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