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Thermocline regulated seasonal evolution of surface chlorophyll in the Gulf of Aden.

Yao F, Hoteit I - PLoS ONE (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi Arabia.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

Bathymetry in the Gulf of Aden.The 500- and 1000-m isobaths are plotted on the map in addition to the depth shadings.
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pone.0119951.g001: Bathymetry in the Gulf of Aden.The 500- and 1000-m isobaths are plotted on the map in addition to the depth shadings.

Mentions: The Gulf of Aden is a deep-water basin located between Yemen and Somalia, with a narrow connection to the Red Sea through the Straits of Bab el Mandeb in the northwest and a wide opening to the Arabian Sea in the east (Fig. 1).


Thermocline regulated seasonal evolution of surface chlorophyll in the Gulf of Aden.

Yao F, Hoteit I - PLoS ONE (2015)

Bathymetry in the Gulf of Aden.The 500- and 1000-m isobaths are plotted on the map in addition to the depth shadings.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4366251&req=5

pone.0119951.g001: Bathymetry in the Gulf of Aden.The 500- and 1000-m isobaths are plotted on the map in addition to the depth shadings.
Mentions: The Gulf of Aden is a deep-water basin located between Yemen and Somalia, with a narrow connection to the Red Sea through the Straits of Bab el Mandeb in the northwest and a wide opening to the Arabian Sea in the east (Fig. 1).

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi Arabia.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus