Coccolithophores from the central Arabian Sea: Sediment trap results

Journal of Earth system science

M V S Guptha1 3²  D K Sinha4³  Lina P Mergulhao1²  V S N Murty1²  Rahul Mohan2¹ 

[1] National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa 403 804, India.$$;National Institute of Oceanography, Dona Paula, Goa 403 004, India.$$;Department of Geology, Banaras Hindu University, Varanasi 221 005, India.$$

关键词: Coccolithophores;    central Arabian Sea;    sediment trap;    monsoon;    upwelling and dissolution.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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, etit {Gephyrocapsa oceanica,Emiliania huxleyi,Umbilicosphaera sibogae} and Umbellosphaera irregularis were the most abundant.The total coccolithophore fluxes ranged from 28.5 × 106 m−2 d−1 to 50.3 × 106 m−2 d−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 coc-colithophore 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 as E.huxleyi, G.oceanica, Calcidiscus leptoporus and Umbellosphaera tenuis showed signs of dissolution.

【 授权许可】

Unknown