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dc.contributor.authorNandakumar, K.
dc.contributor.authorShetye, S.S.
dc.contributor.authorKurian, S.
dc.contributor.authorAparna, S.G.
dc.contributor.authorGauns, M.
dc.contributor.authorDora, Shrikant
dc.date.accessioned2023-06-20
dc.date.accessioned2023-07-05T10:21:03Z
dc.date.available2023-05-10
dc.date.available2023-07-05T10:21:03Z
dc.date.issued2023
dc.identifier.citationRegional Studies in Marine Science, vol.62; 2023; Article no: 102977
dc.identifier.issn2352-4855
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S2352485523001664
dc.identifier.urihttps://doi.org/10.1016/j.rsma.2023.102977
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9028
dc.description2.166
dc.description.abstractUnderstanding physical properties and associated biological responses in the marine ecosystem is critical for fisheries and assessing the ocean’s role in determining the fate of anthropogenic carbon dioxide emissions. This study reports the different roles of southwest monsoon (SWM) upwelling, oceanic fronts, and mesoscale eddies in supplying nutrients and fueling phytoplankton production in the eastern Arabian Sea (EAS). In-situ measurements of physical parameters along with the distribution of biogeochemical parameters in the 100 m water column over a wide latitudinal transect from 8°N to 21°N (Station II-1 to II-14 at 1° interval) along the 68°E were carried out during the late SWM (September 11–19) of 2017. We found distinct features in the study area from the in-situ measurements and satellite data. Primarily, oceanic fronts along with higher instabilities caused vertical mixing at stations II-6, and II-10 (13°N and 17°N). Secondly, eddy-induced lateral advection of high productive water from the Western Arabian Sea (WAS) resulted in high phytoplankton biomass at stations II-7, and II-8 (14°N and 15°N), which led to high concentrations of pigments (chlorophyll-a (Chl-a) and fucoxanthin). SWM upwelling induced higher phytoplankton biomass at northern stations II-13 and II-14 and is evident from the higher total organic carbon (TOC), high total bacterial count (TBC) and Chl-a concentration (up to 0371 μg/L at II-14). The difference in time lag for vertical mixing at II-6 and II-10 are responsible for the contrasting biological responses in these stations. The present study showed that along with SWM upwelling, eddy-induced lateral advection from WAS and oceanic fronts are also increasing phytoplankton biomass in the EAS. The present study suggests that the high phytoplankton biomass prompted by upwelling, oceanic fronts, and mesoscale eddies can influence CO2 sequestration and the prevailing subsurface oxygen minimum zone in the EAS.
dc.languageen
dc.publisherElsevier
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.titleRole of physical processes in regulating the biological responses in the Eastern Arabian Sea during the late southwest monsoon
dc.title.alternative
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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