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Atmospheric outflow of nutrients to the Bay of Bengal: Impact of anthropogenic sources..

DRS at CSIR-National Institute of Oceanography

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Title Atmospheric outflow of nutrients to the Bay of Bengal: Impact of anthropogenic sources..
 
Creator Srinivas, B.
Sarin, M.M.
Sarma, V.V.S.S.
 
Subject Climatic changes
nutrients
biogeochemistry
Chemical constituents
nitrogen
 
Description The air–sea deposition of nutrients (N, P and Fe) to the oceanic regions locateddownwind of pollution sources in south and south-east Asia is gaining considerable attention in the present-day scenario of climate change. We report here a case study on the atmospheric outflow of nutrients from the Indo-Gangetic Plain (IGP) to the Bay of Bengal (BoB). Air mass back trajectories suggest conspicuous downwind transport of chemical constituents from the IGP to the BoBduring the lateNE-monsoon (January–April); thus, representing BoBas oneof theunique oceanic regions influenced by anthropogenic sources over a short span of 3–4 months. During the course of this study (November'09–March'10), nutrient (NO3 − ,NH4 + ,NOrg,PO4 3− and Fews) concentrations in the atmospheric outflow show pronounced temporal variability. The inorganic nitrogen (NH4 + -N: ~90% of NInorg) dominates the total soluble nitrogen (NTot). Although the contribution of organic nitrogen is not significant, the mass ratio of NOrg/NTotin the outflow varied from 0.07 to 0.40. The abundances of PInorg and Fewsvaried from 0.4 to 4.8 nmol m −3 and 0.2 to 0.6 nmol m −3 , respectively. The high abundance of K + and significant (P-valueb0.05) correlation with PInorg and Fewssuggest their significant contribution from biomass burning emissions (BBEs). The characteristic mass ratios of nutrients (NInorg/NTot: 0.92 ± 0.13, NOrg/NTot: 0.21 ± 0.11, and PInorg/nss-Ca 2+ : 0.35 ± 0.23) in the IGP-outflow show striking similarity with those reported over the BoB. These results have implications to further increase in the atmospheric deposition of nutrients and their impact on biogeochemistry of surface Bay of Bengal
 
Date 2015-02-17T05:19:54Z
2015-02-17T05:19:54Z
2015
 
Type Journal Article
 
Identifier Journal of Marine Systems, vol.141; 34-44
http://drs.nio.org/drs/handle/2264/4706
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2014] Elsevier
 
Publisher Elsevier