Modified optical remote sensing algorithms for the Pearl River Estuary

doi:10.1007/s11707-015-0526-3

Front. Earth Sci.

2015, Vol. 9

Issue (4) : 732-741 https://doi.org/10.1007/s11707-015-0526-3

RESEARCH ARTICLE

Modified optical remote sensing algorithms for the Pearl River Estuary

Man-Chung CHIM, Jiayi PAN(

), Wenfeng LAI

Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Hong Kong SAR, China

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Abstract

This study aims to develop new algorithms to retrieve sea surface parameters including concentrations of Chlorophyll a (Chl a) and Suspended Particulate Matter (SPM), and absorbance of Colored Dissolved Organic Matter (aCDOM) by incorporating the contribution of red bands to make them more adaptable to case 2 waters. Optical remote sensing algorithms have demonstrated efficient retrieval of Chl a, SPM, and aCDOM, yet they are not very accurate especially for coastal areas. It has also been found that the default algorithm has overestimated Chl a in the Pearl River Estuary, and shown poor correlation for CDOM absorbance. By incorporating the red band ratios into the algorithm, a correction effect has been shown, which improves the accuracy of quantifying the actual concentration. Modeling and data fitting of the algorithm have been done based on 61 data samples collected in the Pearl River estuary during a cruise from 3 to 11 May 2014. The study also attempts to modify the aerosol correction bands used in SeaDAS to prevent saturation of these bands. The modified algorithms showed an R-Square value of 0.7289 for Chl a fitting, and 0.7338 for CDOM fitting, and corrected overestimation of Chl a concentration in the Pearl River estuary.

Keywords optical remote sensing algorithm Pearl River Estuary

Corresponding Author(s): Jiayi PAN

Just Accepted Date: 26 August 2015 Online First Date: 30 September 2015 Issue Date: 30 October 2015

Cite this article:

Man-Chung CHIM,Jiayi PAN,Wenfeng LAI. Modified optical remote sensing algorithms for the Pearl River Estuary[J]. Front. Earth Sci., 2015, 9(4): 732-741.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-015-0526-3
https://academic.hep.com.cn/fesci/EN/Y2015/V9/I4/732

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