I have a background in Climate modelling and Chemical Engineering.

I am currently in the final stages of my PhD in Climate Modelling at the University of Leeds. The focus of my PhD research is to assess the impact of aerosol particles and cloud droplets on global climate.

I also have a Bachelors in Chemical Engineering from the Indian Institute of Technology Madras, and a masters in Chemical Engineering from TU Delft, where I gained experience designing air quality monitoring instruments.

Research interests

The particular focus of my research work is to develop new parameterisations of sea salt aerosol production from blowing snow, and its climate impact acting as cloud condensation nuclei (CCN) and ice nucleating particle (INP). In particular, we aim to improve the emission scheme above sea ice as a function of i) atmospheric state and ii) sea ice/snow properties. To do this we will use advanced statistical and/or machine learning techniques to explore the underlying processes and the dependence of cloud phase on aerosol properties, atmospheric state parameters, and sea ice. We will test improved model representations of polar aerosols and clouds in a global climate model UKESM to assess associated climate impacts.

Ranjithkumar A, Gordon H, Williamson C, Rollins A, Pringle K, Kupc A, Abraham NL, Brock C, Carslaw K. 2021. Constraints on global aerosol number concentration, SO₂ and condensation sink in UKESM1 using ATom measurements. Atmospheric Chemistry and Physics. 21(6), pp. 4979-5014

Lamkaddam H, Dommen J, Ranjithkumar A, Gordon H, Wehrle G, Krechmer J, Majluf F, Salionov D, Schmale J, Bjelić S, Carslaw KS, El Haddad I, Baltensperger U. 2021. Large contribution to secondary organic aerosol from isoprene cloud chemistry. Science Advances. 7(13)

Chu B, Dias A, Ding A, Dommen J, Duplissy J, El Haddad I, Gonzalez Carracedo L, Granzin M, Hansel A, Heinritzi M, Hofbauer V, Junninen H, Kangasluoma J, Kemppainen D, Kim C, Kong W, Krechmer JE, Kvashin A, Laitinen T, Lamkaddam H, Lee CP, Lehtipalo K, Leiminger M, Li Z, Makhmutov V, Manninen HE, Marie G, Marten R, Mathot S, Mauldin RL, Mentler B, Möhler O, Müller T, Nie W, Onnela A, Petäjä T, Pfeifer J, Philippov M, Ranjithkumar A, Saiz-Lopez A, Salma I, Scholz W, Schuchmann S, Schulze B, Steiner G, Stozhkov Y, Tauber C, Tomé A, Thakur RC, Väisänen O, Vazquez-Pufleau M, Wagner AC, Wang Y, Weber SK, Winkler PM, Wu Y, Xiao M, Yan C, Ye Q, Ylisirniö A, Zauner-Wieczorek M, Zha Q, Zhou P, Flagan RC, Curtius J, Baltensperger U, Kulmala M, Kerminen V-M, Kurtén T, Donahue NM, He X-C, Tham YJ, Dada L, Wang M, Finkenzeller H, Stolzenburg D, Iyer S, Simon M, Kürten A, Shen J, Rörup B, Rissanen M, Schobesberger S, Baalbaki R, Wang DS, Koenig TK, Jokinen T, Sarnela N, Beck LJ, Almeida J, Amanatidis S, Amorim A, Ataei F, Baccarini A, Bertozzi B, Bianchi F, Brilke S, Caudillo L, Chen D, Chiu R, and 5 other authors. 2021. Role of iodine oxoacids in atmospheric aerosol nucleation. Science. 371(6529), pp. 589-595

Simon M, Dada L, Heinritzi M, Scholz W, Stolzenburg D, Fischer L, Wagner AC, Kürten A, Rörup B, He X-C, Almeida J, Baalbaki R, Baccarini A, Bauer PS, Beck L, Bergen A, Bianchi F, Bräkling S, Brilke S, Caudillo L, Chen D, Chu B, Dias A, Draper DC, Duplissy J, El-Haddad I, Finkenzeller H, Frege C, Gonzalez-Carracedo L, Gordon H, Granzin M, Hakala J, Hofbauer V, Hoyle CR, Kim C, Kong W, Lamkaddam H, Lee CP, Lehtipalo K, Leiminger M, Mai H, Manninen HE, Marie G, Marten R, Mentler B, Molteni U, Nichman L, Nie W, Ojdanic A, Onnela A, Partoll E, Petäjä T, Pfeifer J, Philippov M, Quéléver LLJ, Ranjithkumar A, Rissanen MP, Schallhart S, Schobesberger S, Schuchmann S, Shen J, Sipilä M, Steiner G, Stozhkov Y, Tauber C, Tham YJ, Tomé AR, Vazquez-Pufleau M, Vogel AL, Wagner R, Wang M, Wang DS, Wang Y, Weber SK, Wu Y, Xiao M, Yan C, Ye P, Ye Q, Zauner-Wieczorek M, Zhou X, Baltensperger U, Dommen J, Flagan RC, Hansel A, Kulmala M, Volkamer R, Winkler PM, Worsnop DR, Donahue NM, Kirkby J, Curtius J. 2020. Molecular understanding of new-particle formation from α-pinene between −50 and +25 °C. Atmospheric Chemistry and Physics. 20(15), pp. 9183-9207

Stolzenburg D, Simon M, Ranjithkumar A, Kürten A, Lehtipalo K, Gordon H, Ehrhart S, Finkenzeller H, Pichelstorfer L, Nieminen T, He X-C, Brilke S, Xiao M, Amorim A, Baalbaki R, Baccarini A, Beck L, Bräkling S, Caudillo Murillo L, Chen D, Chu B, Dada L, Dias A, Dommen J, Duplissy J, El Haddad I, Fischer L, Gonzalez Carracedo L, Heinritzi M, Kim C, Koenig TK, Kong W, Lamkaddam H, Lee CP, Leiminger M, Li Z, Makhmutov V, Manninen HE, Marie G, Marten R, Müller T, Nie W, Partoll E, Petäjä T, Pfeifer J, Philippov M, Rissanen MP, Rörup B, Schobesberger S, Schuchmann S, Shen J, Sipilä M, Steiner G, Stozhkov Y, Tauber C, Tham YJ, Tomé A, Vazquez-Pufleau M, Wagner AC, Wang M, Wang Y, Weber SK, Wimmer D, Wlasits PJ, Wu Y, Ye Q, Zauner-Wieczorek M, Baltensperger U, Carslaw KS, Curtius J, Donahue NM, Flagan RC, Hansel A, Kulmala M, Lelieveld J, Volkamer R, Kirkby J, Winkler PM. 2020. Enhanced growth rate of atmospheric particles from sulfuric acid. Atmospheric Chemistry and Physics. 20(12), pp. 7359-7372

Wang M, Kong W, Marten R, He X-C, Chen D, Pfeifer J, Heitto A, Kontkanen J, Dada L, Kürten A, Yli-Juuti T, Manninen HE, Amanatidis S, Amorim A, Baalbaki R, Baccarini A, Bell DM, Bertozzi B, Bräkling S, Brilke S, Murillo LC, Chiu R, Chu B, De Menezes L-P, Duplissy J, Finkenzeller H, Carracedo LG, Granzin M, Guida R, Hansel A, Hofbauer V, Krechmer J, Lehtipalo K, Lamkaddam H, Lampimäki M, Lee CP, Makhmutov V, Marie G, Mathot S, Mauldin RL, Mentler B, Müller T, Onnela A, Partoll E, Petäjä T, Philippov M, Pospisilova V, Ranjithkumar A, Rissanen M, Rörup B, Scholz W, Shen J, Simon M, Sipilä M, Steiner G, Stolzenburg D, Tham YJ, Tomé A, Wagner AC, Wang DS, Wang Y, Weber SK, Winkler PM, Wlasits PJ, Wu Y, Xiao M, Ye Q, Zauner-Wieczorek M, Zhou X, Volkamer R, Riipinen I, Dommen J, Curtius J, Baltensperger U, Kulmala M, Worsnop DR, Kirkby J, Seinfeld JH, El-Haddad I, Flagan RC, Donahue NM. 2020. Rapid growth of new atmospheric particles by nitric acid and ammonia condensation. Nature. 581(7807), pp. 184-189

Barmpounis K, Ranjithkumar A, Schmidt-Ott A, Attoui M, Biskos G. 2018. Enhancing the detection efficiency of condensation particle counters for sub-2 nm particles. Journal of Aerosol Science. 117, pp. 44-53

Publications from NERC Open Research Archive

1. How sea ice and snow regulate climate

   CRiceS investigates the rapid decline of sea ice and its links to physical and chemical changes in polar oceans and the atmosphere.

   Read more of: How sea ice and snow regulate climate

   

1. Clouds formed with sea salt contribute to Arctic warming

   Scientists studying Arctic warming have shared new evidence that sea salt aerosols from “blowing snow” play a significant role in forming clouds that reflect solar radiation back to the Earth’s surface.

   Read more of: Clouds formed with sea salt contribute to Arctic warming