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Biological Nitrogen Fixation
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Marine Nutrient Cycling
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C:N:P Stoichiometry
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Ocean Alkalinity Enhancement/CO2 removal
methods
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Ocean (paleo) (De)oxygenation
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Isotopic Fractionation Processes
Professional Affiliations
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Indian
National Science Academy (INSA) Associate Fellow (2023)
·
DST-Swarnajayanti
Fellowship (2020-2021)
·
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)
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Associate,
Indian Academy of Sciences (IASc), Bengaluru (2017-2020)
·
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)
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Cluster of
Excellence ‘The Future Ocean’ Post-doctoral fellowship (May 2013 - October
2014)
·
Gothenburg
University Post-doctoral fellowship (March 2013 - April 2013)
·
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
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POGO-SCOR
fellowship (2009) to work at MPIMM,
Professional Services
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Editor: JGR: Oceans (an AGU journal) (July 2021 – present)
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Editor:
Ocean Science (an EGU journal) (June 2020 – June 2021)
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Member:
Scientific Steering Committee of SOLAS (Surface Ocean Lower Atmosphere Study)
(2022-2024)
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Member:
AGU’s Diversity, Equity, Inclusion, and Accessibility (DEIA) committee
(2022-present)
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Member:
National Committee for Scientific Committee on Oceanic Research (SCOR,
2024-2027)
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Member:
Board of Studies, Pandit Deendayal Petroleum University, India (2020 - present)
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Member:
Board of Studies, Geology Department, Gujarat University, India (2019 -
present)
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Visiting
faculty, Department of Climate Change, Gujarat University (2016 - present)
·
Chairperson
(2018 – 2022) and Founding member of the Early Career Scientists Network of
IIOE-2
·
Founding
member (2018 - 2021) of the early career researchers network of IAPSO
·
Member:
International Science Planning Committee of IIOSC-2022 at Goa
·
Co-convener
of EGU General Assembly-2019-2022 session on Air-sea Chemical Fluxes
Peer-Reviewed Journal Articles
1. 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
2. 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
3. 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
4. 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
5. 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
6. 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
7. 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
8. 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.
9. 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.
10. 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
11. 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
12. 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
13. Singh, A. and P. Chaturvedi
(2021), Error Propagation. Resonance,
doi://10.1007/s12045-021-1185-1
14. 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.
15. 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
16. 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
17. 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
18. 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
19. 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
20. 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
21. 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
22. 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.
23. 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
24. 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
25. 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.
26. 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
27. 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
28. 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
29. 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
30. 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
31. 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
32. 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
33. 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
34. 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
35. 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
36. 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
37. 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
38. 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
39. 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
40. 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
41. 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)
42. 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
43. 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
44. 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
45. 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
46. 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
47. Thirumalai, K., A. Singh, and R. Ramesh (2011), A MATLABTM code to perform weighted linear
regression with (correlated or uncorrelated) errors in bivariate data, Journal of the Geological
Society of India, 77,
377-380.
48. 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
49. 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.
50. 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.
51. 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.