Remote sensing of salinity from satellite-derived CDOM in the Changjiang River-dominated East China Sea
Defining highly variable freshwater plume area from space is important for characterizing the dynamics of biogeochemical properties and understanding the effects of climate change and human activities on plume-related processes.The absorption coefficient of colored dissolved organic matter (aCDOM) from satellite ocean color data can be used to estimate the salinity and thus the plume area in coastal oceans if a robust conservative salinity and aCDOM relationship and an accurate satellite aCDOM algorithm can be established.In this paper,tight relationships between surface water salinity and in situ aCDOM were found during several cruises covering all seasons and the full salinity range in the East China Sea (ECS).Thus,a salinity inversion model from aCDOM was developed and validated with an independent dataset,in which 73.6% of the data were within the absolute salinity error of ±1 and 87.1% were within ±1.5.Factors influencing the conservative behavior of CDOM are analyzed,with a particular focus on the effect of the phytoplankton-induced autochthonous CDOM.In addition,several satellite aCDOM algorithms were compared and validated with our in situ data.Monthly satellite-derived salinity images were mapping in August from 2008-2010 and showed the significant inter-annual variability in the plume coverage.This study demonstrated that the salinity derived from satellite-derived aCDOM can provide a reliable,good synoptic view of the plume area and help with biogeochemical studies,in particular,those properties related to the inter-annual variability of plume coverage,although the development of a localized satellite algorithm of aCDOM is still desirable.
CDOM absorption coefficient Changjiang River plume East China Sea satellite remote sensing
Yan Bai Delu Pan Wei-Jun Cai Xianqiang He Difeng Wang Bangyi Tao Qiankun Zhu
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Stat School of Marine Science and Policy, University of Delaware, Newark, Delaware, USA, 19716
国际会议
The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)
杭州
英文
856-865
2013-04-23（万方平台首次上网日期，不代表论文的发表时间）