A biological Indian Ocean Dipole event in 2019

Abstract The 2019 positive Indian Ocean Dipole (IOD) event in the boreal autumn was the most serious IOD event of the century with reports of significant sea surface temperature (SST) changes in the east and west equatorial Indian Ocean. Observations of the Visible Infrared Imaging Radiometer Suite...

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Autores principales:	Wei Shi, Menghua Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/25986d423bcf4206ba02f44814536b3d
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spelling	oai:doaj.org-article:25986d423bcf4206ba02f44814536b3d2021-12-02T10:48:22ZA biological Indian Ocean Dipole event in 201910.1038/s41598-021-81410-52045-2322https://doaj.org/article/25986d423bcf4206ba02f44814536b3d2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81410-5https://doaj.org/toc/2045-2322Abstract The 2019 positive Indian Ocean Dipole (IOD) event in the boreal autumn was the most serious IOD event of the century with reports of significant sea surface temperature (SST) changes in the east and west equatorial Indian Ocean. Observations of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) between 2012 and 2020 are used to study the significant biological dipole response that occurred in the equatorial Indian Ocean following the 2019 positive IOD event. For the first time, we propose, identify, characterize, and quantify the biological IOD. The 2019 positive IOD event led to anomalous biological activity in both the east IOD zone and west IOD zone. The average chlorophyll-a (Chl-a) concentration reached over ~ 0.5 mg m−3 in 2019 in comparison to the climatology Chl-a of ~ 0.3 mg m−3 in the east IOD zone. In the west IOD zone, the biological activity was significantly depressed. The depressed Chl-a lasted until May 2020. The anomalous ocean biological activity in the east IOD zone was attributed to the advection of the higher-nutrient surface water due to enhanced upwelling. On the other hand, the dampened ocean biological activity in the west IOD zone was attributed to the stronger convergence of the surface waters than that in a normal year.Wei ShiMenghua WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wei Shi Menghua Wang A biological Indian Ocean Dipole event in 2019
description	Abstract The 2019 positive Indian Ocean Dipole (IOD) event in the boreal autumn was the most serious IOD event of the century with reports of significant sea surface temperature (SST) changes in the east and west equatorial Indian Ocean. Observations of the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) between 2012 and 2020 are used to study the significant biological dipole response that occurred in the equatorial Indian Ocean following the 2019 positive IOD event. For the first time, we propose, identify, characterize, and quantify the biological IOD. The 2019 positive IOD event led to anomalous biological activity in both the east IOD zone and west IOD zone. The average chlorophyll-a (Chl-a) concentration reached over ~ 0.5 mg m−3 in 2019 in comparison to the climatology Chl-a of ~ 0.3 mg m−3 in the east IOD zone. In the west IOD zone, the biological activity was significantly depressed. The depressed Chl-a lasted until May 2020. The anomalous ocean biological activity in the east IOD zone was attributed to the advection of the higher-nutrient surface water due to enhanced upwelling. On the other hand, the dampened ocean biological activity in the west IOD zone was attributed to the stronger convergence of the surface waters than that in a normal year.
format	article
author	Wei Shi Menghua Wang
author_facet	Wei Shi Menghua Wang
author_sort	Wei Shi
title	A biological Indian Ocean Dipole event in 2019
title_short	A biological Indian Ocean Dipole event in 2019
title_full	A biological Indian Ocean Dipole event in 2019
title_fullStr	A biological Indian Ocean Dipole event in 2019
title_full_unstemmed	A biological Indian Ocean Dipole event in 2019
title_sort	biological indian ocean dipole event in 2019
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/25986d423bcf4206ba02f44814536b3d
work_keys_str_mv	AT weishi abiologicalindianoceandipoleeventin2019 AT menghuawang abiologicalindianoceandipoleeventin2019 AT weishi biologicalindianoceandipoleeventin2019 AT menghuawang biologicalindianoceandipoleeventin2019
_version_	1718396636878602240

A biological Indian Ocean Dipole event in 2019

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