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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 >Summer Chlorophyll - a distribution in eastern Arabian Sea off Karnataka - Goa coast from Satellite and in-situ observations
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Summer Chlorophyll - a distribution in eastern Arabian Sea off Karnataka - Goa coast from Satellite and in-situ observations

机译：夏季叶绿素-来自卡纳塔克邦-阿阿沿岸阿拉伯海东部的卫星和原位观测分布

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摘要

Chlorophyll-a maps derived from IRS-P4 Ocean Color Monitor (OCM) was used to study the distribution pattern of phytoplankton biomass in the eastern Arabian sea off Karnataka - Goa coast, southwest coast of India. The data was compared with in-situ measurements of chlorophyll-a concentration estimated for 100 stations covering an area of more than 4000 km~2 in the above region. The presence of dense algal blooms spread over an area of almost 100 km~2 representing Trichodesmium sp. 18km off Kumta - Gokarna in the eastern Arabian Sea depicts high value (30 to 40 mg/m~3) of chlorophyll concentration. Similarly, around the Nethrani Island, off Bhatkal, the surface concentration ranged from 5 to 10 mg/m~3. The secchi depth varied from 4 to 8 m near the island. The sea surface area enveloping this high bloom (around the island) depicts a normal distribution of chlorophyll-a ranging from of 0.1 to 5 mg/m~3. It is suggested here, that the low salinity value (35 to 35.2 per thousand) around the Nethrani Island enhances the algal bloom due to enrichment of nutrients in the shallow marine environment through probable inputs of nutrient charged fresh water from the island aquifers. Near river mouths, the values are marginally high in the range of 3 to 5 mg/m~3, probably enforced by riverine nutrient inputs well depicted by the Tadri River. The satellite (IRS-P4 OCM) derived images of chlorophyll during summer also shows high values as a band parallel to the coast. During the occurrence of algal blooms this band, parallel to the coast, widens offshore and this phenomenon of widening is typically absent during non-bloom summer scenarios, as identified for summer 2005.
机译：来自IRS-P4海洋颜色监测器（OCM）的叶绿素a图用于研究印度西南海岸卡纳塔克邦-果阿海岸附近阿拉伯东部海域浮游植物生物量的分布模式。将该数据与原位测量的叶绿素a浓度进行了比较，叶绿素a浓度估计为上述区域内超过4000 km〜2的100个站点。密集的藻华的存在散布在代表Trichodesmium sp。的近100 km〜2的区域中。阿拉伯海东部的库姆塔（Kumta）-戈卡纳（Gokarna）距离18公里，显示出很高的叶绿素浓度值（30至40 mg / m〜3）。同样，在巴特卡尔（Bhatkal）附近的内塔拉尼（Nethrani）岛周围，地表浓度范围为5至10 mg / m〜3。岛屿附近的地段深度从4到8 m不等。包围着这种高潮的海域（岛屿周围）描绘出叶绿素-a的正态分布范围为0.1至5 mg / m〜3。在此建议，由于可能通过从岛屿含水层中输入带营养成分的淡水来补充浅海环境中的营养成分，内塔拉尼岛周围较低的盐度值（每千分之35至35.2）会增强藻类繁殖。在河口附近，该值略高，在3至5 mg / m〜3范围内，这可能是由塔德里河所描绘的河流养分输入所强制执行的。卫星（IRS-P4 OCM）衍生的夏季叶绿素图像在平行于海岸的波段也显示出很高的值。在发生藻华期间，该带平行于海岸，在近海处加宽，这种增宽现象通常在2005年夏季非花开的夏季情况下不存在。

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