Study on attenuation depths for MODIS bands in the Bohai Sea in China

LIU Ying; LI Guo-sheng

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LIU Ying, LI Guo-sheng. Study on attenuation depths for MODIS bands in the Bohai Sea in China[J]. Haiyang Xuebao, 2009, 31(3): 21-29.

Citation:

LIU Ying, LI Guo-sheng. Study on attenuation depths for MODIS bands in the Bohai Sea in China[J]. Haiyang Xuebao, 2009, 31(3): 21-29.

LIU Ying, LI Guo-sheng. Study on attenuation depths for MODIS bands in the Bohai Sea in China[J]. Haiyang Xuebao, 2009, 31(3): 21-29.

Citation:

LIU Ying, LI Guo-sheng. Study on attenuation depths for MODIS bands in the Bohai Sea in China[J]. Haiyang Xuebao, 2009, 31(3): 21-29.

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Study on attenuation depths for MODIS bands in the Bohai Sea in China

LIU Ying¹,
LI Guo-sheng^2
,

1.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China
2.
Graduate School, Chinese Academy of Sciences, Beijing 100039, China

Received Date: 2008-12-30
Rev Recd Date: 2009-03-10

Abstract

Abstract

An attenuation depth is defined for remote sensing purposes as adepth above which 90% of the arising light leaving the water surface is emanated.The deeper the attenuation depth,the more information of water is detected by remote sensing,then the more precise information of water is extracted.Mean-while,the attenuation depth is help to know water layer(by it s thickness) from which remote sensing will be able to extract information.A number of investigators are using the moderate resolut ion imaging spectroradiometer(or MODIS) for remote sensing of ocean color.It is necessary to have a rough idea of the effectiveat tenuation depth of imagery in each of the spectral bands employed by the MODIS.The attenuation depth is directly determined from MODIS data.Though analyzing the spectral distributions of attenuation depth on 7 August 2003 and the seasonal variations of attenuation depth(551nm) in the Bohai Sea indicated that the spectral distributions of the attenuation depth for the spectralrange 400~700 nm are single-peak curves,and their similar and difference in different regions consist with other scholarsc results of zoning,moreover their support the Bohai Sea is Case 2 water;the maximum at tenuation depths shift to-ward longer wavelengths,liking thered shift,with increase of turbidity of water,just like in these regions representing by Points C and G is at 531nm,by Point Fis the maximum attenuation depth at 551nm,by Points A,B,D and E is at 555nm;the seasonal change of the attenuation depth is the largest in the summer,followed by the fall,and the ranking of winter and spring in different regions is varied.The at tenuation depth in different regions is varied:the attenuation depth of Points A and E is less than that of Point Dless than that of Pint Bless than that of Points C and F less than that of point G(excluding 412 and 645nm) ,in which the order of at tenuation depth of between Points A and E(and between Points F and C) representing regions is dissimilarity in different seasons and different bands.
- attenuation depth,
- MODIS,
- Bohai Sea

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References(27)

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