dc.contributor.author | Vidya, P.J. | |
dc.contributor.author | Kurian, S. | |
dc.date.accessioned | 2019/03/31 | |
dc.date.accessioned | 2019-04-30T12:44:25Z | |
dc.date.available | 2018/10/01 | |
dc.date.available | 2019-04-30T12:44:25Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Journal of Marine Systems, vol.186; 2018; 96-104 | |
dc.identifier.issn | 0924-7963 | |
dc.identifier.uri | https://doi.org/10.1016/J.JMARSYS.2018.06.005 | |
dc.identifier.uri | http://drs.nio.org/drs/handle/2264/8082 | |
dc.description.abstract | The 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.language | en | |
dc.publisher | Elsevier | |
dc.relation.isreferencedby | SCI | |
dc.title | Impact of 2015-2016 ENSO on the winter bloom and associated phytoplankton community shift in the northeastern Arabian Sea | |
dc.type | Journal Article | |
dc.affiliation.author | CSIR-National Institute of Oceanography, Dona Paula, Goa, India | |