首页|Remote sensing monitoring for impact of island on chloro-phyll a in the water near the Diaoyu Island(Diaoyu Dao)and its affiliated islands,China
Remote sensing monitoring for impact of island on chloro-phyll a in the water near the Diaoyu Island(Diaoyu Dao)and its affiliated islands,China
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Remote sensing monitoring for impact of island on chloro-phyll a in the water near the Diaoyu Island(Diaoyu Dao)and its affiliated islands,China
The Diaoyu Island(Diaoyu Dao)and its affiliated islands(DAA)have abundant fishery resources,and chlorophyll a(Chl a)concentration is an important marine color element and an important indicator of primary productivity in the ocean.Therefore,it is meaningful to understand the distribution and variation characteristics of Chl a concentration in the waters near the DAA.The distribution details of Chl a concentration in the adjacent waters of DAA were revealed by high-resolution satellite GF-1 Wide Field View(WFV)data with 16 m spatial resolution.The results indicate that:(1)The Chl a concentration is between 0.06 μg/L and 0.38 μg/L throughout the year and the concentration of Chl a in the northeast and east directions of the island(downstream)is significantly higher than that in the west(upstream),and there are observed vortexes with high Chl a concentration in the downstream of DAA.This phenomenon continues to persist in the waters surrounding the DAA all year.(2)The vortex induced by the interaction between the current and island results in the vorticity change of water,inducing the replenishment of a large number of nutrients to the surface,thereby promoting the growth of plankton in the downstream of DAA on the east.In addition,the DAA also plays a significant role in regulating the downstream mix layer depth(MLD).The MLD in the northeast downstream is considerably deeper than the upstream in winter and spring;it is deeper in the east downstream in summer and autumn,and the range of influence for the MLD is greatly larger than the size of the island itself.This shows that the disruption of the DAA on the current is substantial.In addition,the combined effects of SST and wind also play a significant role in modifying Chl a distribution.(3)Based on the analysis above,this study proposes the conception of building fishing pastures downstream of the DAA,and proposes a general migration plan in different seasons to scientifically and rationally utilize and protect the surrounding waters of DAA.
Diaoyu Island and its affiliated islandshigh-resolution satellitechlorophyll a
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