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dc.contributor.authorSarma, V.V.S.S.
dc.contributor.authorSridevi, B.
dc.contributor.authorKumar, Ashwini
dc.contributor.authorBikkina, S.
dc.contributor.authorKumari, V.R.
dc.contributor.authorBikkina, P.
dc.contributor.authorYadav, K.
dc.contributor.authorRao, V.D.
dc.date.accessioned2022-10-30
dc.date.accessioned2023-03-01T09:15:30Z
dc.date.available2022-10-19
dc.date.available2023-03-01T09:15:30Z
dc.date.issued2022
dc.identifier.citationEnvironmental Science: Processes & Impacts, vol.24(10); 2022; 1895-1911
dc.identifier.issn2050-7895
dc.identifier.otherhttps://pubs.rsc.org/en/content/articlehtml/2022/em/d2em00234e
dc.identifier.urihttps://doi.org/10.1039/D2EM00234E
dc.identifier.urihttps://drs.nio.org/drs/handle/2264/8955
dc.description5.334
dc.description.abstractAerosols are one of the significant external sources of soluble reactive nitrogen to the surface ocean and their deposition affects the primary productivity.Owing to rapid industrialization over South and Southeast Asia, an increasing trend in atmospheric pollutants was observed over the northern Indian Ocean (NIO).To assess the contribution of the aeolian supply of inorganic nitrogen to the NIO, the available compositional data of marine aerosols collected over this basin between 2001 and 2020 were compiled.Based on the observed relationship of mass load, and particulate nitrate and ammonium concentrations with the corresponding satellite-derived anthropogenic aerosol optical depth (AAOD), the temporal, spatial, and long-term variabilities were derived for the past two decades.In particular, high aerosol mass load, nitrate and ammonium levels were observed in the coastal aerosols of peninsular India during fall and winter and they were low in summer.The atmospheric input of inorganic nitrogen to the Arabian Sea is higher (AS; 1.7 TgN per year) compared to that of the Bay of Bengal (BoB; 0.9 TgN per year) and accounts for ~30% of the total external sources of nitrogen to the NIO.The new production, supported by external sources of nitrogen, contributes to ~23 and 53% of export production to the oxygen minimum zone (OMZ) in the AS and BoB respectively.A significant rate of increase in the aerosol mass load (0.05-1.67 �g per m3 per year), and nitrate (0.003-0.04 �g per m3 per year) and ammonium (0.006-0.11 �g per m3 per year) concentrations was observed between 2001 and 2020, likely because of the increased emission of anthropogenic pollutants over South and Southeast Asia and their subsequent long-range atmospheric transport to the NIO.Overall, these results suggest that an enhanced contribution of atmospheric nitrogen may potentially increase (1) the N/P ratio of the surface ocean that impacts phytoplankton composition, (2) export production to the OMZ leads to intensification, and (3) sequestration of atmospheric CO2.A decrease in primary production due to global warming is reported due to a decrease in vertical nutrient supply; however, the increase in atmospheric deposition of nutrients may compensate for this.Therefore, ocean models must be coupled with atmospheric models to better constrain the oceanic response to climate change in the NIO.
dc.languageen
dc.publisherThe Royal Society of Chemistry
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleImpact of atmospheric anthropogenic nitrogen on new production in the northern Indian Ocean: Constrained based on satellite aerosol optical depth and particulate nitrogen levels
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India


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