Coccolithophores from the central Arabian Sea: Sediment trap results |
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| Authors: | Lina P Mergulhao Rahul Mohan V S N Murty M V S Guptha D K Sinha |
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| Institution: | (1) National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(2) National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, 403 804 Goa, India;(3) Present address: 62, Sagar Society, Dona Paula, 403 004 Goa, India;(4) Department of Geology, Banaras Hindu University, 221 005 Varanasi, India |
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| Abstract: | Sediment trap samples collected from a depth of 1018 m in the Central Arabian Sea Trap (CAST) at 14°28.2′N, 64°35.8′E were
analyzed for temporal variation of coccolithophore fluxes from October 1993 to August 1994. Out of the twenty species of coccolithophores
encountered,Gephyrocapsa oceanica, Emiliania huxleyi, Umbilicosphaera sibogae andUmbellosphaera irregularis were the most abundant. The total coccolithophore fluxes ranged from 28.5 × 106m-2d-1 to 50.3 × 106m-2d-1 showing seasonality with higher fluxes during the northeast (NE) monsoon and lower fluxes during the spring intermonsoon.
The higher fluxes were attributed to the enhancement of primary production in the central Arabian Sea due to southward extent
of nutrients from the northeast Arabian Sea by the prevailing surface currents. Similarly, the occurrences of relatively lower
coccolithophore fluxes during the spring intermonsoon and southwest (SW) monsoon were attributed to the low nutrients in the
warm, shallow surface mixed layer and downwelling to the south of Findlater Jet respectively in the central Arabian Sea. Some
of the coccolithophore species such asE. huxleyi, G. oceanica, Calcidiscus leptoporus andUmbellosphaera tenuis showed signs of dissolution. |
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| Keywords: | Coccolithophores central Arabian Sea sediment trap monsoon upwelling and dissolution |
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