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Coccolithophores from the central Arabian Sea: Sediment trap results

机译:来自阿拉伯海中部的球墨鱼:沉积物陷阱的结果

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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, Gephyrocapsa oceanica, Emiliania huxleyi, Umbilicosphaeru sibogae and Umbellosphaera irregularis were the most abundant. The total coccolithophore fluxes ranged from 28.5 x 10~6m~(-2)d~(-1) to 50.3 x 10~6m~(-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 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 as E. huxleyi, G. oceanica, Calcidiscus leptoporus and Umbellosphaera tenuis showed signs of dissolution.
机译:分析了1993年10月至1994年8月在中部阿拉伯海圈(CAST)1018 m深度,北纬14°28.2',东经64°35.8'处收集的沉积物捕集子的石藻通量的时间变化。碰到的球墨角藻种类最多的是海洋藻类(Gephyrocapsa oceanica),Em虫(Emiliania huxleyi),Umbilicosphaeru sibogae和Umbellosphaera不规则藻。球石藻总通量范围从28.5 x 10〜6m〜(-2)d〜(-1)到50.3 x 10〜6m〜(-2)d〜(-1)呈季节性变化,东北(NE)期间通量较高春季季风期间季风和较低通量。较高的通量归因于阿拉伯海中部初级生产力的提高,这是由于主要的海流使阿拉伯东北海的养分向南延伸。同样,春季季风和西南季风期间相对较低的球石藻通量的发生,分别归因于阿拉伯中央海中温暖的浅层混合层中的低养分,以及分别位于阿拉伯海中部芬德勒急流南部的下流。一些球石藻物种,例如赫希利大肠杆菌,大肠埃希氏菌,淡水Calcidiscus leptoporus和Umbellosphaera tenuis都显示出溶解的迹象。

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