Andrew Orr

Climate Physicist

Andrew Orr

Contact

Andrew Orr

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

  • Why the Antarctic Peninsula has warmed and the impact of this on ice shelves.
  • Improved understanding and prediction of West Antarctic climate change.
  • Why Antarctic sea ice has increased in recent decades.
  • The assessment and improvement of high-resolution atmospheric models over complex regions.
  • The dynamical mechanisms associated with recent Southern Hemisphere climate change in response to the Antarctic ozone hole.
  • Modelling the effects of realistic polar stratospheric clouds (PSCs) to improve projections of the closure of the Antarctic ozone hole.
  • Hydrological impacts of climate change in the Himalayas and Andes.
  • Clarifying cloud microphysics in the Himalayan region.

Research grants

  • 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

  • 2019-present Jeremy Carter (PhD) “Diagnosing Antarctic ice shelf risk using coupled computational modelling” (Co-supervisor)
  • 2019 Aymeric Delon (Masters) “Study of mountain-wave-induced stratospheric cooling over the Antarctic Peninsula using a parameterisation scheme in the UM-UKCA chemisty 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).
  • 2016 – present Ella Gilbert (PhD) “Melting of the ice shelves around the Antarctic Peninsula” (Primary supervisor).
  • 2016-present Claire Donnely (PhD) “Modelling the flow and mass budget of the Patagonian ice fields” (Joint 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).
  • 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.

 

2019

V. Prasad, A. V. Kulkarni, S. Pradeep, S. Pratibha, S. A. Tawde, T. Shirsat, A. R. Arya, A. Orr, and D. Bannister, ‘Large losses in glacier area and water availability  by the end of the century under high greenhouse gas emission scenario, Satluj basin, Himalaya’, Current Science, 2019.

 

2018

K. Clem, A. Orr, and J. Pope, ‘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, doi:10.1038/s41598-018-30496-5, 2018.

P. Deb. A. Orr, D. H. Bromwich, J. P. Nicholas, J. Turner, and J. S. Hosking, ‘Summer drivers of atmospheric variability affecting ice shelf thinning in the Amudsen Sea Embayment, West Antarctica’, Geophysical Research Letters, 45, 4124-4133, https://doi.org/10.1029/2018GL077092, 2018.

E. R. Potter, A. Orr, I. C. Willis, D. Bannister, and F. Salerno, ‘Dynamical drivers of the local wind regime in a Himalayan valley’, Journal of Geophysics Research, doi: 10.1029/2018JD029427, 2018.

M. Widmann, 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. ‘Current Opportunities and Challenges in Developing Hydro-Climatic Services in the Himalayas: Report of India-UK Water Centre Pump Priming Project 2017’, Centre for Ecology & Hydrology, Wallingford and Indian Institute of Tropical Meteorology, Pune, 2018.

R. Spang, L. Hoffmann, R. Muller, J.-U. Groob, I. Tritscher, M. Hopfner, M. Pitts, A. Orr, and M. Riese, ‘A climatology of polar stratospheric cloud composition between 2002 and 2012 based on MIPAS/Envisat observations’, Atmospheric Chemistry and Physics, 18, 5089-5113, doi: 10.5194/acp-18-5089-2018, 2018.

P. Kuipers Munneke, 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. ‘Intense winter surface melt on an Antarctic ice shelf’, Geophysical Research Letters, 45, https://doi.org/10.1029/2018GL077899, 2018.

2017

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

Orr, A., ‘Regional climate downscaling through the Antarctic CORDEX project’, World Meteorological Organisation Antarctic Treaty Paper, 2017.

Turner, J., A. Orr, H. Gudmundsson, A. Jenkins, R. G. Bingham, C.-D. Hilenbrand, and T. J. Bracegirdle, ‘Atmosphere-ocean-ice interactions in the Amundsen Sea Embayment, West Antarctica’, Review of Geophysics, 55, 235-276, doi: 10.1002/2016RG000532, 2017.

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

Hoffman, L., R. Spang, A. Orr, M. J. Alexander, L. A. Holt, and O. Stein, ‘A decadal satellite record of gravity wave activity to study polar stratospheric cloud formation’, Atmospheric Chemistry and Physics, 17, 2901-2920, doi: 10.5194/acp-17-2901-2017, 2017.

Pope, J. O., P. R. Holland, A. Orr, G. J. Marshall, and T. Phillips, ‘The impacts of El Niño on the observed sea ice budget of West Antarctica’, Geophysical Research Letters, 44, 6200-6208, doi: 10.1002/2017GL073414, 2017.

Zhang, X., T. Jung, M. Wang, Y. Luo, T. Semmler, and A. Orr, ‘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, 2017.

Moffat-Griffin, T., M. J. Taylor, T. Nakamura, A. J. Kavanagh, J. S. Hosking, and A. Orr, ‘3rd Antarctic Gravity Wave Instrument Network (ANGWIN) science workshop’, Advances in Atmospheric Science, 32, 1-3, doi: 10.1007/s00376-016-6197-5, 2017.

King, J., A. Kirchgaessner, S. Bevan, A. D. Elvidge, P. Kuipers Munneke, A. Luckman, A. Orr, I. A. Renfrew, M. R. van den Broeke, ‘The impacts of fohn winds on surface energy balance during the 2010-2011 melt season over Larsen C Ice Shelf, Antarctica’, Journal of Geophysical Research, doi: 10.1002/2017JD026809, 2017.

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, ‘Does strong tropospheric forcing cause large-amplitude mesospheric gravity waves? – A DEEPWAVE case study’, Journal of Geophysical Research, doi: 10.1002/2017JD027371, 2017.

2016

Hosking, S., A. Orr, T. Bracegirdle, and J. Turner, ‘Future circulation changes off West Antarctica: Sensitivity of the Amundsen Sea Low to projected anthropogenic forcing’, Geophysical Research Letters, 43, 367-376, doi: 10.1002/2015GL067143, 2016.

Deb, P., A. Orr, J. S. Hosking, T. Phillips, J. Turner, D. Bannister, J. Pope, and S. Colwell, ‘An assessment of the Polar WRF representation of near-surface meterological variables over West Antarctica’, Journal of Geophysical Research, 121, 1532-1548, doi: 10.1002/2015JD024037, 2016.

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

Elvidge, A., I. Renfrew, J. King, A. Orr, and T. A. Lachlan-Cope, ‘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, 2016.

Spang, R., L. Hoffmann, M. Hopfner, S. Griessbach, R Muller, M. C. Pitts, A. Orr, and M. Riese ‘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, 2016.

 

2015

Orr, A., J. S. Hosking, L. Hoffmann, J. Keeble, S. M. Dean, H. K. Roscoe, L. Abraham, S. Vosper, and T. Phillips, ‘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, doi: 10.5194/acp-15-1071-2015, 2015.

Orr, A. and J. C. R. Hunt, ‘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, ‘Foehn jets over the Larsen C Ice Shelf, Antarctica’, Quarterly Journal of the Royal Meteorological Society, 141, 698-713, doi: 10.1002/qj.2382, 2014.

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, ‘Validation of the summertime surface energy budget of Larsen C Ice Shelf (Antarctica) as represented in three high-resolution atmospheric models’, Journal of Geophysical Resarch, doi: 10.1002/2014JD022604, 2015.

 

2014

Orr, A., T. Phillips, S. Webster, A. Elvidge, M. Weeks, S. J. Hosking, and J. Turner, ‘Met Office Unified Model high resolution simulations of a strong wind event in Antarctica’, Quarterly Journal of the Royal Meteorological Society, 140, 2287-2297, doi: 10.1002/qj.2296, 2014.

Hosking, J. S., D. Bannister, A. Orr, J. King, E. Young, and T. Phillips, ‘Orographic forcing of surface winds over the shelf waters adjacent to South Georgia’, Atmospheric Science Letters, 16, 50-55, doi: 10.1002/asl2.519, 2014.

 

2013

Orr, A., T. J. Bracegirdle, J. S. Hoskings, W. Feng, H. Roscoe, and J. D. Haigh, ‘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, 2013.

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

Hosking, J. S., A. Orr, G. J. Marshall, J. Turner, and T. Phillips, ‘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, 2013.

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

 

2012

Orr, A., T. J. Bracegirdle, J. S. Hoskings, T. Jung, J. D. Haigh, T. Phillips, and W. Feng, ‘Possible dynamical mechanisms for Southern Hemisphere climate change due to the ozone hole’, Journal of the Atmospheric Sciences, 69, 2917-2932, doi: 10.1175/JAS-D-11-0210.1, 2012.

Turner, J., T. Phillips, J. S. Hosking, G. J. Marshall, and A. Orr, ‘The Amundsen Sea low’, International Journal of Climatology, doi: 10.1002/joc.3558, 2012.

 

2010

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

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, ‘The ECMWF model climate: Recent progress through improved physical parametrizations’, Quarterly Journal of the Royal Meteorological Society, 136, 1145-1160, 2010.

 

2009

Orr, A., and Bechtold, P., ‘Improvement in the capturing of short-range warm season orographic precipitation in the ECMWF model’, Meteorology and Atmospheric Physics, 103, 2009.

Orr, A., ‘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, 2009.

Orr, A., and N. Wedi, ‘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, 2009.

Turner, J., S. N. Chenoli, A. abu Samah, G. Marshall, T. Phillips, and A. Orr, ‘Strong wind events in the Antarctic’, Journal of Geophysical Research, 114, D18103, doi:10.1029/2008JD011642, 2009.

Turner, J., J. C. Comiso, G. J. Marshall, T. A. Lachlan-Cope, T. Bracegirdle, T. Maksym, M. P. Meredith, Z. Wang, and A. Orr, ‘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, L08502, doi:10.1029/2009GL037524, 2009.

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, ‘Record low surface air temperature at Vostock station, Antarctica’, Journal of Geophysical Research, 114, D24102, doi:10.1029/2009JD012104, 2009.

 

2008

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

Van Lipzig, N. P. M., Marshall, G. J., Orr, A., and King, J. C., ‘The relationship between the southern hemisphere annular mode and Antarctic Peninsula summer temperatures: Analysis of a high-resolution model’, Journal of Climate, 21, 2008.

 

2007

Orr, A., ‘Evaluation of revised parameterization of sub-grid orographic drag’, ECMWF technical memo no. 536, ECMWF, Reading, UK, 2007.

 

2006

Marshall, G. J., Orr, A., van Lipzig, N., and King, J. C., ‘The impact of a changing Southern Hemisphere Annular Mode on Antarctic Peninsula summer temperatures’, Journal of Climate, 19, 5388-5404, 2006.

 

2005

Orr, A., Hunt, J. C. R., Capon, R., Sommeria, J., Cresswell, D. and Owinoh, D., ‘Coriolis effects on wind jets and cloudiness along coasts’, Weather, 60, 291-299, 2005.

Orr, A., Hanna, E., Hunt, J. C. R., Cappelen, J., Steffen, K. and Stephens, A., ‘Characteristics of stable flows over Southern Greenland’, Pure and Applied Geophysics, 162, 1747-1778, 2005.

Owinoh, A., Hunt, J. C. R., Orr, A., Clark, P., Klein, R., Fernando, H. J. S., and Nieuwstadt, F. T. N., ‘Effects of changing surface heat flux on the atmospheric boundary layer flow over flat terrain’, Boundary Layer Meteorology, 116, 331-361, 2005.

 

2004

Orr, A., Cresswell, D., Marshall, G. J., Hunt, J. C. R., Sommeria, J., Wang, C. G. and Light, M., ‘A ‘low-level’ explanation for the recent large warming trend over the western Antarctic Peninsula involving blocked winds and changes in zonal circulation’, Geophysical Research Letters, 31, L06204, doi:10.1029/2003GLO19160, 2004.

Hunt, J. C. R., Orr, A., Rottman, J. W. and Capon, R., ‘Coriolis effects in mesoscale flows with sharp changes in surface conditions’, Quarterly Journal of the Royal Meteorological Society, 130, 2703-2731, 2004.

 

2003

Hunt, J. C. R., Orr, A., Cresswell, D. and Owinoh, A., ‘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, 2003.

 

Publications from NERC Open Research Archive

2019

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