Vertical profiles of beam attenuation coefficients in East China Sea

Qiong Liu; Delu Pan; Yan Bai; Xuan Zhang; Lin Zhang; Qiankun Zhu

doi:10.1117/12.974324

19 October 2012 Vertical profiles of beam attenuation coefficients in East China Sea

Qiong Liu, Delu Pan, Yan Bai, Xuan Zhang, Lin Zhang, Qiankun Zhu

Proceedings Volume 8532, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012; 85320X (2012) https://doi.org/10.1117/12.974324
Event: SPIE Remote Sensing, 2012, Edinburgh, United Kingdom

Abstract

The vertical profiles of beam attenuation coefficient (c) can provide information about the distribution and variability of suspended particles in the water column. Vertical profiles of particulate beam attenuation coefficient at 660 nm (c_p(660)), Chlorophyll a (chla) and Particulate Organic Carbon(POC) were analyzed to examine patterns and controlling factors of vertical distributions in the East China Sea (ECS), based on two cruises in summer and late autumn. In late autumn, the c_p(660) profiles showed uniform distribution with depth in most of shelf regions, and high value of c_p(660) was observed in some inshore stations caused by strong resuspension. In summer, c_p(660) exhibited weak subsurface maxima phenomenon in outer shelf, while with the well vertical mixed structures in the northern coast areas of ECS. The variability of c_p(660) between summer and autumn were mainly influenced by the changes of thermocline distribution in the ECS. In the late autumn, water potential density were characterized as fully vertical mixed, on the contrary, the strong stratifications of water column were observed in summer. Except for several inshore stations with highly influenced by terrestrial input, significant relationships between POC and c_P(660) were observed in both late autumn and summer. The close relationship between POC and c_p(660) could be an potential application to retrieve the POC profiles from in situ c_P(660) measurements, and be applied to the surface POC estimated from space.

Citation Download Citation

Qiong Liu, Delu Pan, Yan Bai, Xuan Zhang, Lin Zhang, and Qiankun Zhu "Vertical profiles of beam attenuation coefficients in East China Sea", Proc. SPIE 8532, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012, 85320X (19 October 2012); https://doi.org/10.1117/12.974324

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