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dc.contributor.authorVidya, P.J.
dc.contributor.authorKurian, S.
dc.date.accessioned2019/03/31
dc.date.accessioned2019-04-30T12:44:25Z
dc.date.available2018/10/01
dc.date.available2019-04-30T12:44:25Z
dc.date.issued2018
dc.identifier.citationJournal of Marine Systems, vol.186; 2018; 96-104
dc.identifier.issn0924-7963
dc.identifier.urihttps://doi.org/10.1016/J.JMARSYS.2018.06.005
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8082
dc.description.abstractThe present study explores the impact of 2015-16 El-Niño Southern Oscillation (ENSO) on the winter phytoplankton bloom in the northeastern Arabian Sea (NEAS). In situ Chlorophyll a (Chla) from the bio-Argo float (2013-2016) and phytoplankton pigment data collected onboard R.V. Sindhu Sankalp (February 2013 and 2016) have been used to decipher the 2015-2016 ENSO modulated variability. During a normal winter, convective mixing deepens the mixed layer (ML) and increases the availability of nutrients in the euphotic zone. During the 2015-16 ENSO, the intensity of the convection (evaporation) was weaker than normal and this, in turn, weakened the convective mixing in the following winter. However, during the 2015-16 ENSO event, a warm core eddy deepened the ML further by pushing the nutracline downwards, thereby reducing the availability of nutrients. Changes in the physical condition during the 2015-16 ENSO altered the nutrient availability which in turn affected the Chla production and associated phytoplankton community structure. The Bio-Argo observations show 50% reduction in Chla during February 2016 compared to a normal year, which we attribute to the ENSO event of 2015-2016. Additionally, pigment data shows a reduction in the abundance of microplankton (diatoms and dinoflagellates) and an increase in abundance of picoplankton in the NEAS. Our results clearly indicate that 2015 ENSO played a dominant role in altering the phytoplankton community composition and in turn the productivity of the Arabian Sea.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.titleImpact of 2015-2016 ENSO on the winter bloom and associated phytoplankton community shift in the northeastern Arabian Sea
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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