Influences of the Great Whirl on surface chlorophyll a concentration off the Somali Coast in 2017

The general features of the Great Whirl (GW) off the Somali Coast in 2017 and its influences on chlorophyll a (Chl a ) concentration were studied by using satellite data and model outputs. Results show that GW, which initiated at 7°N, 53°E on June 13, had a lifetime of 153 d with an average amplitud...

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Bibliographic Details
Published in:Acta oceanologica Sinica 2021-11, Vol.40 (11), p.79-86
Main Authors: Dai, Lingxing, Han, Bing, Tang, Shilin, Chen, Chuqun, Du, Yan
Format: Article
Language:English
Subjects:
Blooms
Chlorophyll
Chlorophyll a
Climatology
Earth and Environmental Science
Earth Sciences
Ecology
Ekman pumping
Engineering Fluid Dynamics
Environmental Chemistry
Life cycle
Life cycles
Marine & Freshwater Sciences
Marine Meteorology and Marine Physics
Mixed layer
Nutrients
Oceanography
Physical Oceanography
Phytoplankton
Pumping
Satellite data
Transport
Transportation
Vortices
Water exchange
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Summary:The general features of the Great Whirl (GW) off the Somali Coast in 2017 and its influences on chlorophyll a (Chl a ) concentration were studied by using satellite data and model outputs. Results show that GW, which initiated at 7°N, 53°E on June 13, had a lifetime of 153 d with an average amplitude of 16 cm and an average radius of 205 km. After the formation of GW, the concentration of Chl a in the interior of GW showed a downward trend throughout its life cycle, except in early July and mid-October. In early July, the Chl a blooms in the interior of GW were attributed to the combined effect of three processes. They are eddy horizontal transportation, the deepening of the mixed layer caused by the monsoon and eddy pumping, and the upward transportation of nutrients caused by eddy-induced Ekman pumping. In October, the Chl a blooms were probably due to the weakening of GW. During the period, water exchange occurred more frequently across the eddy, thus phytoplanktons were imported into the interior of GW.
ISSN:0253-505X
1869-1099
DOI:10.1007/s13131-021-1740-3