The characteristics of a level sea-ice multiangle reflection spectrum in the Bohai Sea

LIU Chengyu; GU Wei; LI Lantao; XU Yingjun

doi:10.3969/j.issn.0253-4193.2013.03.013

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LIU Chengyu, GU Wei, LI Lantao, XU Yingjun. The characteristics of a level sea-ice multiangle reflection spectrum in the Bohai Sea[J]. Haiyang Xuebao, 2013, 35(3): 112-118. doi: 10.3969/j.issn.0253-4193.2013.03.013

Citation:

LIU Chengyu, GU Wei, LI Lantao, XU Yingjun. The characteristics of a level sea-ice multiangle reflection spectrum in the Bohai Sea[J]. Haiyang Xuebao, 2013, 35(3): 112-118. doi: 10.3969/j.issn.0253-4193.2013.03.013

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The characteristics of a level sea-ice multiangle reflection spectrum in the Bohai Sea

doi: 10.3969/j.issn.0253-4193.2013.03.013

State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

Received Date: 2012-05-17
Rev Recd Date: 2013-03-01

Abstract

Abstract

In the last decades,the remote sensing technology has played a crucial role in the monitoring of the sea-ice in the Bohai Sea. The reflection characteristics of the sea ice are the fundamentals of sea-ice monitoring based on an optical remote sensing. The hemispherical-directional reflectance factor (HDRF)of three paradigmatic classes of level sea-ice collected from the eastern Liaodong Bay during the sea ice maximum is measured under cloudless sky conditions,and related anisotropic factor(ANIF)is also calculated thereafter. The results show that the hemispherical-directional reflectance factor and the anisotropic factor can increase rapidly only near the forward reflection direction within the principle plain of solar incident,while in other viewing directions,the variations of these two factors are insignificant. In addition,the thickness and inner structure of level sea-ice can affect the characteristics of the HDRF and the ANIF with varying wavelength. In the band of 350-1 350 nm,thin level sea-ice with a smooth surface has a relatively small HDRF,and thick level sea-ice has a relatively large HDRF. But in the band of 350~950 nm,absolute conclusions are drawn,thin level sea-ice with the smooth surface has a relatively large ANIF,and thick level sea-ice has a relatively small ANIF. These results suggest that the sea-ice reflection to the solar incident radiation is the combined consequent of ice-atmosphere interface reflection and internal scattering of sea ice.
- sea ice in the Bohai Sea,
- remote sensing,
- multiangle,
- hemispherical-directional reflectance factor,
- anisotropic factor

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