Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea

Abstract Upwelling is a physical phenomenon that occurs globally along the eastern boundary of the ocean and supports pelagic fishery which is an important source of protein for the coastal population. Though upwelling and associated small pelagic fishery along the eastern Arabian Sea (EAS) is known...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Jayu Narvekar, Riyanka Roy Chowdhury, Diksha Gaonkar, P. K. Dinesh Kumar, S. Prasanna Kumar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6854d086d419409ab3bf98bf494b3a90
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6854d086d419409ab3bf98bf494b3a90
record_format	dspace
spelling	oai:doaj.org-article:6854d086d419409ab3bf98bf494b3a902021-12-02T18:17:41ZObservational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea10.1038/s41598-021-86594-42045-2322https://doaj.org/article/6854d086d419409ab3bf98bf494b3a902021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86594-4https://doaj.org/toc/2045-2322Abstract Upwelling is a physical phenomenon that occurs globally along the eastern boundary of the ocean and supports pelagic fishery which is an important source of protein for the coastal population. Though upwelling and associated small pelagic fishery along the eastern Arabian Sea (EAS) is known to exist at least for the past six decades, our understanding of the factors controlling them are still elusive. Based on observation and data analysis we hypothesize that upwelling in the EAS during 2017 was modulated by freshwater-induced stratification. To validate this hypothesis, we examined 17 years of data from 2001 and show that inter-annual variability of freshwater influx indeed controls the upwelling in the EAS through stratification, a mechanism hitherto unexplored. The upper ocean stratification in turn is regulated by the fresh water influx through a combination of precipitation and river runoff. We further show that the oil sardine which is one of the dominant fish of the small pelagic fishery of the EAS varied inversely with stratification. Our study for the first time underscored the role of freshwater influx in regulating the coastal upwelling and upper ocean stratification controlling the regional pelagic fishery of the EAS.Jayu NarvekarRiyanka Roy ChowdhuryDiksha GaonkarP. K. Dinesh KumarS. Prasanna KumarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jayu Narvekar Riyanka Roy Chowdhury Diksha Gaonkar P. K. Dinesh Kumar S. Prasanna Kumar Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
description	Abstract Upwelling is a physical phenomenon that occurs globally along the eastern boundary of the ocean and supports pelagic fishery which is an important source of protein for the coastal population. Though upwelling and associated small pelagic fishery along the eastern Arabian Sea (EAS) is known to exist at least for the past six decades, our understanding of the factors controlling them are still elusive. Based on observation and data analysis we hypothesize that upwelling in the EAS during 2017 was modulated by freshwater-induced stratification. To validate this hypothesis, we examined 17 years of data from 2001 and show that inter-annual variability of freshwater influx indeed controls the upwelling in the EAS through stratification, a mechanism hitherto unexplored. The upper ocean stratification in turn is regulated by the fresh water influx through a combination of precipitation and river runoff. We further show that the oil sardine which is one of the dominant fish of the small pelagic fishery of the EAS varied inversely with stratification. Our study for the first time underscored the role of freshwater influx in regulating the coastal upwelling and upper ocean stratification controlling the regional pelagic fishery of the EAS.
format	article
author	Jayu Narvekar Riyanka Roy Chowdhury Diksha Gaonkar P. K. Dinesh Kumar S. Prasanna Kumar
author_facet	Jayu Narvekar Riyanka Roy Chowdhury Diksha Gaonkar P. K. Dinesh Kumar S. Prasanna Kumar
author_sort	Jayu Narvekar
title	Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
title_short	Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
title_full	Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
title_fullStr	Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
title_full_unstemmed	Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea
title_sort	observational evidence of stratification control of upwelling and pelagic fishery in the eastern arabian sea
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6854d086d419409ab3bf98bf494b3a90
work_keys_str_mv	AT jayunarvekar observationalevidenceofstratificationcontrolofupwellingandpelagicfisheryintheeasternarabiansea AT riyankaroychowdhury observationalevidenceofstratificationcontrolofupwellingandpelagicfisheryintheeasternarabiansea AT dikshagaonkar observationalevidenceofstratificationcontrolofupwellingandpelagicfisheryintheeasternarabiansea AT pkdineshkumar observationalevidenceofstratificationcontrolofupwellingandpelagicfisheryintheeasternarabiansea AT sprasannakumar observationalevidenceofstratificationcontrolofupwellingandpelagicfisheryintheeasternarabiansea
_version_	1718378278297796608

Observational evidence of stratification control of upwelling and pelagic fishery in the eastern Arabian Sea

Ejemplares similares