Arvind Singh E-mail: arvinds@prl.res.in Telephone: +91-79-2631 4366

Research Interests: primarily focusing on the following aspects of ocean biogeochemistry

·      ocean alkalinity enhancement

·      C, N, P and S cycling

·      past and present ocean (de)oxygenation

·      anthropogenic impacts on ocean nutrient cycling

·      isotopic fractionation processes

 

Professional Affiliations

·      Associate Professor (July 2020 - present) at PRL, Ahmedabad, India

·      Reader (December 2015 – July 2020) at PRL, Ahmedabad, India

·      Post-doctoral Fellow (May 2013 - December 2015) at GEOMAR, Kiel, Germany

·      Post-doctoral Fellow (September 2011 - April 2013) at University of Gothenburg, Sweden

·      NF-POGO Scholar (August 2011 - May 2012) at Bermuda Institute of Ocean Sciences (BIOS), Bermuda

·      Post-doctoral Fellow (February 2011 - August 2011) at PRL, Ahmedabad, India

·      POGO-SCOR Scholar (September 2009 - November 2009) at Max Plank Institute for Marine Microbiology (MPIMM), Bremen, Germany

·      Research Fellow (July 2006 - January 2011) at PRL, Ahmedabad

·      Project Associate (January 2005 - June 2006) at PRL, Ahmedabad

 

Professional Activities

·           Editor: JGR: Oceans (an AGU journal) (July 2021 - present)

·           Topic Editor: Ocean Science (an EGU journal) (June 2020 - June 2021)

·           International Implementation Committee member of BioGeoSCAPES (2024 - present)

·           Scientific Steering Committee member: SOLAS (Surface Ocean Lower Atmosphere Study) (2022-2024)

·           Member: AGU’s Diversity, Equity, Inclusion, and Accessibility (DEIA) committee (2022-present)

·           Member: National Committee for Scientific Committee on Oceanic Research (SCOR, 2024-2027)

·           Member: Board of Studies, Pandit Deendayal Petroleum University, India (2020 - present)

·           Member: Board of Studies, Geology Department, Gujarat University (2019 onwards)

·           Visiting faculty, Dept of Botany, Gujarat University (2017 onwards)

·           Member: International Science Planning Committee of International Indian Ocean Science Conference-2022 at Goa

·           Founding member (2018 - 2021) of early career researchers network of IAPSO

·           Chairperson and Founding member of Early Career Scientists Network (ECSN) of IIOE-2

 

 

Honours and Awards

·           INSA Associate Fellow (2023)

·           DST-Swarnajayanti Fellowship (2021-2025)

·           Member, Indian National Young Academy of Sciences (INYAS) (2021-2025)

·           Young Researcher Award, Ministry of Earth Sciences, India (2020)

·           Indian Geophysical Union (IGU) - Krishnan Medal (2020)

·           Young Associate (2017-2019), Indian Academy of Sciences (IASc), Bangalore

·           INSPIRE faculty fellowship, DST India (2015-2020)

·           DFG (Leibniz-Preis) Post-doctoral fellowship (May 2015 - April 2016)

·           Sonderforschungsbereich ‘(SFB-754)’ Post-doctoral fellowship (October 2014 - April 2015)

·           Cluster of Excellence ‘The Future Ocean’ Post-doctoral fellowship (May 2013 – October 2014)

·           Swedish Institute Post-doctoral fellowship (September 2011 - February 2013)

·           NF-POGO Center of Excellence 2011 fellowship for participating in a ten months Observational Oceanography training programme at BIOS, Bermuda

·           POGO-SCOR fellowship in 2009 to work at Max Plank Institute for Marine Microbiology, Bremen Germany during September-November 2009

 

 

Peer-Reviewed Journal Articles

1.  Saxena, H., S. Mehta, S. Nazirahmed, J. Kumar, S. Kumar, S., and A. Singh (2025), Diazotrophs: An overlooked sink of N₂O. Geophysical Research Letters, 52(6), e2024GL114117.

2.  Thirumalai, K., S. Clemens, Y. Rosenthal, S. Conde, K. Bu, S. Desprat, M. Erb, L. Vetter, M. Franks, J. Cheng, L. Li, Z. Liu, L. Zhou, L. Giosan, A. Singh, and V. Mishra (2025), Extreme Indian summer monsoon states stifled Bay of Bengal productivity across the last deglaciation. Nature Geoscience, pp.1-7.

3.  Gupta, M., L. Sahu, N. Tripathi, A. K. Sudheer, and A. Singh (2025), Processes Controlling DMS Variability in Marine Boundary Layer of the Arabian Sea During Post-Monsoon Season of 2021. Journal of Geophysical Research: Atmospheres,130 (9), e2024JD042547

4.  Nazirahmed, S., P. Rahi, H. Saxena, A. Singh, and R. Panchal (2025), High prokaryotic diversity in the oxygen minimum zone of the Bay of Bengal: implications for nutrient cycling. Aquatic Microbial Ecology, 91, 31-51.

5.  Mehta, S., R. Kiko, H. Hauss, N. Ojha, and A. Singh (2024), Phosphate influx and dust deposition create zonal and meridional biogeochemical gradients in Trichodesmium abundance. Global Biogeochemical Cycles, 38(8), e2024GB008182.

6.  Sahoo, D., H. Saxena, S. Nazirahmed, M. Khan, D. Rai, N. Sharma, S. John, S. Kumar, A. K. Sudheer, R. Bhushan, and A. Singh (2024), Winter convective mixing regulates oceanic C: N: P ratios. Limnology and Oceanography, 69(8), 1720-1733.

7.  Sarkar, S., A. Rahman, M. Khan, A. Rathi, P. Ragavan, A. Singh, and S. Kumar (2024), Isotopic evidence for degradation of particulate black carbon in the ocean. Geophysical Research Letters, 51(9), e2023GL106050.

8.  Lachkar, Z., M. Cornejo-D'Ottone, A. Singh, J. Arístegui, B. Dewitte, S. Fawcett, V. Garçon, E. Lovecchio, V. Molina, and P. N. M. Vinayachandran (2024), Biogeochemistry of greenhouse gases in coastal upwelling systems: Processes and sensitivity to global change. Elementa: Science of the Anthropocene 12 (1).

9.  Chowdhury, S., H. Berthelot, C. Baudet, D. González-Santana, C. Reeder, S. l'Helguen, J. Maguer, C. Löscher, A. Singh, S. Blain, N. Cassar, S. Bonnet, H. Planquette, and M. Benavides (2024), Fronts divide diazotroph communities in the Southern Indian Ocean. FEMS Microbiology Ecology, 100(8), p.fiae095.

10.  Saxena, H., D. Sahoo, S. Nazirahmed, N. Sharma, D. Rai, S. Kumar, and A. Singh, A. (2024), Winter convective mixing mediating coupling of N‐gain and‐loss in the Arabian Sea. Journal of Geophysical Research: Oceans, 129(5), e2023JC020839.

11.  Xenopoulos, M. A., B. Bond‐Lamberty, A. Desai, D. Huntzinger, P. Buchanan, A. East, A. Singh, P. Wooden, K. Jewett, and M. Ricci (2024), AGU publications updates authorship policy to foster greater equity and transparency in global research collaborations. AGU Advances, 5(3), e2024AV001298.

12.  AGU Editorial Network (2024). Challenges Facing Scientific Publishing in the Field of Earth & Space Sciences. AGU Advances, 5(4), e2024AV001334.

13.  Krishna, A., A. Tirkey, M. Raman, S.M. Ali, A. Sahay, A., & A. Singh (2024), Unravelling pre-monsoon phytoplankton: pigment profiles and community structure in the western and central Bay of Bengal. Marine and Freshwater Research, 75(18)

14.  Kumar, P.K., A. Singh, and R. Ramesh (2023), Convective mixing and transport of the Bay of Bengal water stir the δ¹⁸O-salinity relation in the Arabian Sea. Journal of Marine Systems, 238, 103842, doi://10.1016/j.jmarsys.2022.103842

15.  Saxena, H., D. Sahoo, S. Nazirahmed, D. Chaudhari, P. Rahi, S. Kumar, M. Benavides, A.V. Krishna, A.K. Sudheer, and A. Singh (2023), The Bay of Bengal: An Enigmatic Diazotrophic Niche. Journal of Geophysical Research: Biogeosciences, doi:// 10.1029/2023JG007687

16.  Chowdhury, S., E. Raes, C. Hörstmann, A. Ahmed, C. Ridame, N. Metzl, P.S. Bhavya, T. Sato, T. Shiozaki, S. Bonnet, C.R. Löscher, A. Singh, and M. Benavides (2023), Diazotrophy in the Indian Ocean: Current understanding and future perspectives. Limnology and Oceanography Letters, 8(5), doi://10.1002/lol2.10343

17.  Iglesias-Rodríguez, M.D., R.E. Rickaby, A. Singh, and J.A. Gately (2023), Laboratory experiments in ocean alkalinity enhancement research. State of the Planet, doi:///10.5194/sp-2-oae2023-5-2023

18.  Saxena, H., and A. Singh (2023). Primary Production and Its Governing Factors in the Northern Indian Ocean. In Dynamics of Planktonic Primary Productivity in the Indian Ocean (pp. 149-168). Cham: Springer International Publishing.

19.  Shao, Z., Y. Xu, Y.,.. A. Singh, et al. (2023), Global oceanic diazotroph database version 2 and elevated estimate of global oceanic N₂ fixation, Earth System Science Data, doi://10.5194/essd-15-3673-2023

20.  Saxena, H., D. Sahoo, S. Nazirahmed, D. Rai, A. Khan, N. Sharma, S. Kumar, and A. Singh (2022), Contribution of Carbon Fixation towards Carbon Sink in the Ocean Twilight Zone. Geophysical Research Letters, doi://10.1029/2022GL099044

21.  Khan, A., A. Rahman, D. Sahoo, H. Saxena, A. Singh, and S. Kumar (2022), Nitrous oxide in the central Bay of Bengal during the summer monsoon. Regional Studies in Marine Science, 52, 102314, doi://10.1016/j.rsma.2022.102314

22.  Kumar, A., G. Shukla, and A. Singh (2022), Long Range Global Transport of Dust and Characterization of Dust, In Asian Atmospheric Pollution, pp. 483-504, Elsevier, doi://10.1016/B978-0-12-816693-2.00012-3.

23.  Varna, M., A. Singh, D. Sahoo, and D. Sengupta (2021), Strengthening of basin-scale ocean currents in winter drives decadal salinity decline in the eastern Arabian Sea. Geophysical Research Letters, 48, e2021GL094516.

24.  Sahoo, D., H. Saxena, S. Nazirahmed, S. Kumar, A. Sudheer, R. Bhushan, A. Sahay, and A. Singh (2021), Role of eddies and N₂ fixation in regulating C:N:P proportions in the Bay of Bengal. Biogeochemistry, doi://10.1007/s10533-021-00833-4

25.  Rahman, A., A. Khan, A. Singh, and S. Kumar (2021), Hydrological characteristics of the Bay of Bengal water column using δ¹⁸O during the Indian summer monsoon. Continental Shelf Research, 226, 104491, doi://10.1016/j.csr.2021.104491

26.  Singh, A., L. Bach, C. Löscher, A. Paul, N. Ojha, and U. Riebesell (2021), Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling. Limnology and Oceanography, 66(7), 2855-2867, doi://10.1002/lno.11795

27.  Singh, A. and P. Chaturvedi (2021), Error Propagation. Resonance, doi://10.1007/s12045-021-1185-1

28.  Kumar, P.K. and A. Singh (2021), Increase in summer monsoon rainfall over the northeast India during El Niño years since 1600, Climate Dynamics, 57, 851-863, doi:10.1007/s00382-021-05743-7.

29.  Mehta, S., A. Singh and K. Thirumalai (2021), Uncertainty in palaeosalinity estimates from foraminiferal geochemical records in the northern Indian Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 569, 110326

30.  Vinayachandran, P.N.M., Y. Masumoto, M. Roberts, J. Hugget, I. Halo, A. Chatterjee, P. Amol, G.V.M. Gupta, A. Singh, A. Mukherjee, S. Prakash, L. Beckley, E. Raes, and R. Hood (2021), Reviews and syntheses: Physical and biogeochemical processes associated with upwelling in the Indian Ocean, Biogeosciences, 18, 5967–6029, doi:10.5194/bg-18-5967-2021

31.  Phillips, H.E., A. Tandon, R. Furue, R. Hood, C. Ummenhofer, J. Benthuysen, V. Menezes, S. Hu, B. Webber, A. Franks, D. Cherian, E. Shroyer, M. Feng, H. Wijeskera, A. Chatterjee, L. Yu, J. Hermes, R. Murtugudde, T. Tozuka, D. Su, A. Singh, L. Centurioni, S. Prakash and J. Wiggert , 2021, Progress in understanding of Indian Ocean circulation, variability, air–sea exchange, and impacts on biogeochemistry, Ocean Science, 17, 1677–1751, doi:10.5194/os-17-1677-2021

32.  Rixen, T., G. Cowie, B. Gaye, J. Goes, H.R. Gomes, R.R. Hood, Z. Lachkar, H. Schmidt, J. Segschneider, and A. Singh (2020), Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean. Biogeosciences, 17, 6051-6080, doi:10.5194/bg-17-6051-2020

33.  Sahoo, D., H. Saxena, N. Tripathi, A. Khan, A. Rahaman, S. Kumar, A. Sudheer, and A. Singh (2020), Non-Redfieldian C:N:P ratio in the inorganic and organic pools of the Bay of Bengal during the summer monsoon. Marine Ecology Progress Series, 653, 41–55, doi:10.3354/meps13498

34.  Tripathi, N., L. Sahu, A. Singh, R. Yadav, A. Patel, K. Patel, and P. Meenu. (2020), Elevated levels of biogenic non‐methane hydrocarbons in the marine boundary layer of the Arabian Sea during the inter‐monsoon. Journal of Geophysical Research: Atmospheres, 125, e2020JD032869. doi:10.1029/2020JD032869

35.  Saxena, H., D. Sahoo, M. A. Khan, S. Kumar, A. K. Sudheer, and A. Singh (2020), Dinitrogen Fixation Rates in the Bay of Bengal during Summer Monsoon, Environmental Research Communications, 2, 051007, doi:10.1088/2515-7620/ab89fa

36.  Tripathi, N., L. K. Sahu, A. Singh, R. Yadav, and K. K. Karati (2020), High levels of isoprene in the marine boundary layer of Arabian Sea during spring inter-monsoon: Role of phytoplankton blooms, ACS Earth and Space Chemistry, 4(4), 583-590, doi:10.1021/acsearthspacechem.

37.  Thajudeen, J., P. V. Vipindas, Y. Jesmi, V. Sudheesh, P. M. Parambath, A. Singh, and M. A. Hatha (2020), Nutrient stoichiometry (N:P) controls nitrogen fixation and distribution of diazotrophs in a tropical eutrophic estuary, Marine Pollution Bulletin, 15, 110799, doi:10.1016/j.marpolbul.2019.110799

38.  Singh, A., N. Gandhi, and R. Ramesh, (2019), Surplus supply of bioavailable nitrogen through N₂ fixation to primary producers in the eastern Arabian Sea during autumn, Continental Shelf Research, 181, 103–110 

39.  Hermes, J. C., Y. Masumoto, L. Beal, …, A. Singh et al. (2019), A sustained ocean observing system in the Indian Ocean for climate related scientific knowledge and societal needs, Frontiers in Marine Science, 6:355.

40.  Suntharalingam, P., L. M. Zamora, H. W. Bange, S. Bikkina, E. Buitenhuis, M. Kanakidou, J. F. Lamarque, A. Landolfi, L. Resplandy, M.M. Sarin, S. Seitzinger, and A. Singh (2019), Anthropogenic nitrogen inputs and impacts on oceanic N₂O fluxes in the northern Indian Ocean: The need for an integrated observation and modelling approach, Deep Sea Research II, doi:10.1016/j.dsr2.2019.03.007

41.  Kumar, P. K., A. Singh, and R. Ramesh (2018), Controls on δ¹⁸O, δD and δ¹⁸O-salinity relationship in the northern Indian Ocean, Marine Chemistry, 207, 55-62, doi:10.1016/j.marchem.2018.10.010

42.  Kumar, S., P. S. Bhavya, R. Ramesh, G. V. M. Gupta, F. Chiriboga, A. Singh, I. Karunasagar, A. Rai, A. Rehnstam-Holm, L. Edler, and A. Godhe (2018), Nitrogen uptake potential under different temperature-salinity conditions: Implications for nitrogen cycling under climate change scenarios, Marine Environmental Research, doi:10.1016/j.marenvres.2018.09.001

43.  Singh, A., L. T. Bach, T. Fischer, H. Hauss, R. Kiko, A. J. Paul, P. Stange, P. Vandromme, and U. Riebesell (2017), Niche construction by non-diazotrophs for N₂ fixers in the eastern tropical North Atlantic Ocean, Geophysical Research Letters, 44, doi:10.1002/2017GL074218.

44.  Baker, A. R., M. Kanakidou, K. Altieri, N. Daskalakis, G. Okin, S. Myriokefalitakis, F. Dentener, M. Uematsu, M M. Sarin, R. Duce, J. Galloway, W. Keene, A. Singh, L. Zamora, J. Lamarque, S. Hsu, S. Rohekar, S., and J. Prospero (2017), Observation-and model-based estimates of particulate dry nitrogen deposition to the oceans, Atmospheric Chemistry and Physics, 17(13), 8189-8210, doi:10.5194/acp-17-8189-2017.

45.  Kumar, P. K., A. Singh, R. Ramesh and T. Nallathambi T (2017), N₂ Fixation in the Eastern Arabian Sea: Probable Role of Heterotrophic Diazotrophs. Front. Mar. Sci., 4:80. doi: 10.3389/fmars.2017.00080

46.  Jickells. T., K. Altieri, E. Buitenhuis, A. Baker, D. Capone, R. Duce, F. Dentener, K. Fennel, M. Kanakidou, J. LaRoche, K. Lee, P. Liss, J. Middelburg, K. Moore, G. Okin, A. Oschlies, M. M. Sarin, S. Seitzinger, J. Sharples, A. Singh, P. Suntharalingam, M. Uematsu, and L. Zamora (2017), A reevaluation of the magnitude and impacts of anthropogenic atmospheric nitrogen inputs on the ocean, Global Biogeochemical Cycles, 31(2), 289-305.

47.  Thajudeen, J., J. Yousuf, V. P. Veetil, S. Varghese, A. Singh, and M. H. Abdulla (2017), Nitrogen fixing bacterial diversity in a tropical estuarine sediments, World Journal of Microbiology and Biotechnology, 33(2), 41.

48.  Olofsson, M., J. Egardt, A. Singh, and H. Ploug, (2016), Inorganic phosphorus enrichments in Baltic Sea water have large effects on growth, carbon fixation, and N₂ fixation by Nodularia spumigena. Aquatic Microbial Ecology, 77(2), 111-123.

49.  Singh, A., Kürten, B., Cedras,  R., Fernandes, M., N. Kumar and 41 authors (2016), Perspectives on future Indian Ocean research from early career scientists, Current Science, 111 (11), 1741-1742.

50.  Kahlon, G. K., S. Kumar, A. Rehnstam-Holm, A. Rai, P. S. Bhavya, L. Edler, A. Singh, B. Andersson, I. Karunasagar, R. Ramesh, and A. Godhe (2016), Response of a coastal tropical pelagic microbial community to changed salinity and temperature, Aquatic Microbial Ecology, 77(1), 37-50, doi:10.3354/ame01785.

51.  Singh, A., S. E. Baer, U. Riebesell, A. C. Martiny, and M. W. Lomas (2015), C:N:P stoichiometry at the Bermuda Atlantic Time-series Study station in the North Atlantic Ocean, Biogeosciences, 12, 6389-6403, doi:10.5194/bg-12-6389-2015.

52.  Löscher, C. R., M. A. Fischer, S. C. Neulinger, B. Fiedler, M. Philippi, F. Schütte, A. Singh, H. Hauss, J. Karstensen, A. Körtzinger, S. Künzel, and R. A. Schmitz (2015), Hidden biosphere in an oxygen-deficient Atlantic open-ocean eddy: future implications of ocean deoxygenation on primary production in the eastern tropical North Atlantic, Biogeosciences, 12, 7467-7482, doi:10.5194/bg-12-7467-2015.

53.  Singh, A., and R. Ramesh (2015), Environmental controls on New and Primary Production in the Northern Indian Ocean, Progress in Oceanography, 131, 138-145, doi:10.1016/j.pocean.2014.12.006

54.  Singh, A., N. Gandhi, R. Ramesh, and S. Prakash (2015), Role of Cyclonic Eddy in enhancing Primary and New production in the Bay of Bengal, Journal of Sea Research, 97, 5-13, doi:10.1016/j.seares.2014.12.002

55.  Singh, A., A. Mohiuddin, R. Ramesh, and S. Raghav (2014), Estimating the Loss of Himalayan Glaciers under Global Warming Using the δ¹⁸O-Salinity Relation in the Bay of Bengal, Environmental Science and Technology Letters, 1(5), 249-253, doi:10.1021/ez500076z; (ACS Editors’ Choice Publication, Seawater Survey Traces Loss of Himalayan Glaciers)

56.  Singh, A., K. Hårding, H. R. V. Reddy, and A. Godhe (2014), An assessment of Dinophysis blooms in the coastal Arabian Sea, Harmful Algae, 34, 29-35, doi: 10.1016/j.hal.2014.02.006

57.  Singh, A., R. Ramesh, and A. Godhe (2014), Inter- and intra-specific carbon and nitrogen assimilation by cultured dinoflagellate and diatom species in an isotopic enrichment culture experiment, Current Science, 106 (6), 867-870.

58.  Singh, A., M. W. Lomas, and N. R. Bates (2013), Revisiting N₂ fixation in the North Atlantic Ocean: Significance of deviations from the Redfield Ratio, atmospheric deposition and climate variability, Deep Sea Research, Part II, 93, 148-158. doi:10.1016/j.dsr2.2013.04.008i.

59.  Singh, A., N. Gandhi, and R. Ramesh (2012), Contribution of atmospheric nitrogen deposition to new production in the nitrogen limited photic zone of the northern Indian Ocean, Journal of Geophysical Research: Oceans,117 (C6), doi:10.1029/2011JC007737.

60.  Gandhi, N., A. Singh, S. Prakash, R. Ramesh, Mini Raman, M. S. Sheshshayee, and S. Shetye (2011), First direct N₂ fixation measurements during a Trichodesmium bloom in the eastern Arabian Sea, Global Biogeochemical Cycles, 25 (4), doi:10.1029/2010GB003970.

61.  Thirumalai, K., A. Singh, and R. Ramesh (2011), A MATLAB^TM code to perform weighted linear regression with (correlated or uncorrelated) errors in bivariate data, Journal of the Geological Society of India, 77, 377-380.

62.  Singh, A., and R. Ramesh (2011), Contribution of riverine dissolved inorganic nitrogen flux to new production in the coastal northern Indian Ocean - an assessment, International Journal of Oceanography, vol 2011, doi: 10.1155/2011/983561

63.  Singh, A., R. A. Jani, and R. Ramesh (2010), Spatiotemporal variations of the δ¹⁸O-salinity relation in the northern Indian Ocean, Deep Sea Research, Part I, 57(11), 1422-1431, doi:10.1016/j.dsr.2010.08.002.

64.  Gandhi, N., A. Singh, R. Ramesh, and M. S. Sheshshayee (2010), Nitrogen sources for new production in the NE Indian Ocean, Advances in Geosciences, 24, 55-67.

65.  Ramesh, R., and A. Singh (2010), Isotopic fractionation in open systems: application to organic matter decomposition in ocean and land, Current Science, 98(3), 406-411.