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首页> 外文会议>Remote Sensing of the Marine Environment; Proceedings of SPIE-The International Society for Optical Engineering; vol.6406 >Seasonality in sub-surface chlorophyll maxima in the Arabian Sea: Detection by IRS-P4/OCM and implication of it to primary productivity
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Seasonality in sub-surface chlorophyll maxima in the Arabian Sea: Detection by IRS-P4/OCM and implication of it to primary productivity

机译：阿拉伯海表层叶绿素最大值的季节性：IRS-P4 / OCM检测及其对初级生产力的影响

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摘要

Arabian Sea is highly influenced by monsoon systems like SW monsoon (June — September) and NE monsoon (December-February). This affects distribution pattern of phytoplankton, availability of nutrients and changing temperature specially during winter cooling period (February-March). These and other conditions like quality and quantity of light influence phytoplankton (type and concentration) in the Arabian Sea. In our study we have observed monsoon related peaks in phytoplankton and chlorophyll a in the Arabian Sea. These chlorophyll a (Chl a) concentrations detected by OCM sensor onboard IRS-P4 satellite is helping us to work out seasonality of phytoplankton in the Arabian Sea, which is of the great importance in the field of biology and biogeochemistry of this region. However, during these study subsurface chlorophyll a maxima (SCM) was observed as characteristics feature of chlorophyll a distribution in the Arabian Sea. The subsurface chlorophyll a maxima varies from 30m to 55m in the Arabian Sea during various seasons. During November at St. 1 surface chlorophyll a was 1.503 mgm~(-3)and subsurface chlorophyll maxima was 12.692 mgm~(-3). Similarly, at St. 13 surface chlorophyll a was 0.584 mgm~(-3) and surface chlorophyll maxima was 8.517 mgm~(-3). During upwelling, nutrients remained unused at sub surface due to shortage of light which may lead to subsurface blooms, detection of which is critical for precise estimation of chlorophyll a from ocean colour sensor. During our 5 year study (covering all the seasons) in northeastern (NE) Arabian Sea, we have observed more than 50 % stations were with subsurface chlorophyll a maxima where chlorophyll a was approximately 10 times higher compared to surface value. The high chlorophyll some time detected by OCM is mainly because of detection of subsurface chlorophyll maxima by the satellite but may not actually sampled during ship studies. The satellite penetration depth (ze), subsurface chlorophyll maxima depth, OCM derived chlorophyll a for different seasons in NE Arabian Sea is presented and discussed in this paper.
机译：阿拉伯海受到西南季风（6月至9月）和东北季风（12月至2月）等季风系统的强烈影响。这会影响浮游植物的分布方式，营养物质的供应以及温度的变化，尤其是在冬季降温期（2月至3月）。这些和其他条件（例如光的质量和数量）会影响阿拉伯海中的浮游植物（类型和浓度）。在我们的研究中，我们在阿拉伯海中观察到了与季风相关的浮游植物和叶绿素a峰。由IRS-P4卫星上的OCM传感器检测到的这些叶绿素a（Chl a）浓度正在帮助我们确定阿拉伯海中浮游植物的季节性，这在该地区的生物学和生物地球化学领域具有重要意义。然而，在这些研究中，地下亚叶绿素的最大值（SCM）被观察为阿拉伯海中叶绿素a分布的特征。在不同季节，阿拉伯海的地下叶绿素最大值在30m至55m之间变化。在11月的St. 1期间，表面叶绿素a为1.503 mgm〜（-3），表面亚叶绿素最大值为12.692 mgm〜（-3）。同样，在St. 13，表面叶绿素a为0.584 mgm〜（-3），表面叶绿素最大值为8.517 mgm〜（-3）。在上升流中，由于缺乏光照，养分在地下仍未使用，这可能导致地下开花，其检测对于从海洋颜色传感器精确估算叶绿素a至关重要。在我们对阿拉伯东北部（NE）阿拉伯海进行的5年研究（涵盖所有季节）中，我们观察到超过50％的站位具有最大的地下叶绿素含量，其中叶绿素a约为表面值的10倍。 OCM有时会检测到较高的叶绿素，这主要是因为卫星检测到了地下最大的叶绿素，但在船舶研究期间可能并未实际取样。本文介绍并讨论了阿拉伯东北海不同季节的卫星穿透深度（ze），地下叶绿素最大深度，OCM衍生的叶绿素a。

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