The optical properties and remote sensing retrieval model of chromophoric dissolved organic matter in the Dayang Estuary

WANG Lin; ZHAO Dong-zhi; YANG Jian-hong; CHEN Yan-long

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WANG Lin, ZHAO Dong-zhi, YANG Jian-hong, CHEN Yan-long. The optical properties and remote sensing retrieval model of chromophoric dissolved organic matter in the Dayang Estuary[J]. Haiyang Xuebao, 2011, 33(1): 45-51.

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The optical properties and remote sensing retrieval model of chromophoric dissolved organic matter in the Dayang Estuary

National Marine Environmental Monitoring Center, State Oceanic Administration, Dalian 116023, China

Received Date: 2010-05-07

Abstract

Abstract

Chromophoric dissolved organic matter (CDOM) shows an approximate conservative behavior during estuary mixing, and can be used as the tracer of water mass movement.On the basis of the waters measured data in the Dayang Estuary on 6 May 2009, the optical properties and remote sensing retrieval model of CDOM were analyzed.The results show that CDOM mainly comes from terrigenous input in the study area, and its composition is relatively stable, so the study area belongs coastal Case II water region; a spectral slope S_g(275~295) and an absorption coefficient a_g(400) all have indicative effect on the relative size of the CDOM molecular mass; CDOM exhibits a conservative mixing behavior, with the injection of freshwater in rivers, diffusion, water salinity increases, the high concentration CDOM from the river is diluted, so CDOM concentration decreases, meanwhile the high percentage of macromolecular humic acid contained the river water reduces, correspondingly, the high percentage of small molecular fulvic acid contained the ocean increases, so the S_g and M values increase; the performance of the model based on R_rs(531)/R_rs(551) sensitive band is the best, the coefficient of determination up to 0.84, so this model can be used as remote sensing retrieval model of CDOM in the Dayang Estuary.
- Dayang Estuary,
- chromophoric dissolved organic matter,
- absorption coefficient,
- remote sensing retrieval

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References(28)

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