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Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden

The Gulf of Aden, although subject to seasonally reversing monsoonal winds, has been previously reported as an oligotrophic basin during summer, with elevated chlorophyll concentrations only occurring during winter due to convective mixing. However, the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS...

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Autores principales: Yao, Fengchao, Hoteit, Ibrahim
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366251/
https://www.ncbi.nlm.nih.gov/pubmed/25789465
http://dx.doi.org/10.1371/journal.pone.0119951
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author Yao, Fengchao
Hoteit, Ibrahim
author_facet Yao, Fengchao
Hoteit, Ibrahim
author_sort Yao, Fengchao
collection PubMed
description The Gulf of Aden, although subject to seasonally reversing monsoonal winds, has been previously reported as an oligotrophic basin during summer, with elevated chlorophyll concentrations only occurring during winter due to convective mixing. However, the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) ocean color data reveal that the Gulf of Aden also exhibits a prominent summer chlorophyll bloom and sustains elevated chlorophyll concentrations throughout the fall, and is a biophysical province distinct from the adjacent Arabian Sea. Climatological hydrographic data suggest that the thermocline, hence the nutricline, in the entire gulf is markedly shoaled by the southwest monsoon during summer and fall. Under this condition, cyclonic eddies in the gulf can effectively pump deep nutrients to the surface layer and lead to the chlorophyll bloom in late summer, and, after the transition to the northeast monsoon in fall, coastal upwelling driven by the northeasterly winds produces a pronounced increase in surface chlorophyll concentrations along the Somali coast.
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spelling pubmed-43662512015-03-23 Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden Yao, Fengchao Hoteit, Ibrahim PLoS One Research Article The Gulf of Aden, although subject to seasonally reversing monsoonal winds, has been previously reported as an oligotrophic basin during summer, with elevated chlorophyll concentrations only occurring during winter due to convective mixing. However, the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) ocean color data reveal that the Gulf of Aden also exhibits a prominent summer chlorophyll bloom and sustains elevated chlorophyll concentrations throughout the fall, and is a biophysical province distinct from the adjacent Arabian Sea. Climatological hydrographic data suggest that the thermocline, hence the nutricline, in the entire gulf is markedly shoaled by the southwest monsoon during summer and fall. Under this condition, cyclonic eddies in the gulf can effectively pump deep nutrients to the surface layer and lead to the chlorophyll bloom in late summer, and, after the transition to the northeast monsoon in fall, coastal upwelling driven by the northeasterly winds produces a pronounced increase in surface chlorophyll concentrations along the Somali coast. Public Library of Science 2015-03-19 /pmc/articles/PMC4366251/ /pubmed/25789465 http://dx.doi.org/10.1371/journal.pone.0119951 Text en © 2015 Yao, Hoteit http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Yao, Fengchao
Hoteit, Ibrahim
Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title_full Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title_fullStr Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title_full_unstemmed Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title_short Thermocline Regulated Seasonal Evolution of Surface Chlorophyll in the Gulf of Aden
title_sort thermocline regulated seasonal evolution of surface chlorophyll in the gulf of aden
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366251/
https://www.ncbi.nlm.nih.gov/pubmed/25789465
http://dx.doi.org/10.1371/journal.pone.0119951
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