MEASUREMENT OF THE. SURFACE EMISSIVITYOF TURBID WATERS

• 作 者: 刘文耀 R.T.Field R.G.Gantt V.Klemas
• 机 构: Tianjin University Chinarrrrrrrrn,University of Delaware, U.S.Arrrrrrrrn,Universit
• 出 处: Chinese Journal of Oceanology and Limnology
• 发表日期: 1987年04期
• 关键词: suspended varied SURFACE interpreting ocean roughness extremely assumed imagery

For interpreting thermal IR imagery of the ocean surface, the emissivity of the sea surface is usually assumed to be constant, approximately 0.98. However, the emissivity varies with the roughness of the sea surface, and the concentration and type of suspended particulates. The emissivity variations caused by the suspended sediments introduce significant errors in the satellite-derived temperature maps of turbid coastal waters.We measured in the laboratory the thermal IR emissivity of water as the suspended sediment concentration was varied from zero to extremely high values. The results indicated that increasing the sediment concentration decreases the spectral emissivity within the 8-44um waveband.

For interpreting thermal IR imagery of the ocean surface, the emissivity of the sea surface is usually assumed to be constant, approximately 0.98. However, the emissivity varies with the roughness of the sea surface, and the concentration and type of suspended particulates. The emissivity variations caused by the suspended sediment introducing significant errors in the satellite-derived temperature maps of turbid coastal waters. We measured in the laboratory the thermal IR emissivity of water as the suspended sediment concentration was varied from zero to extremely high values. The results indicated that increasing the sediment concentration decreases the spectral emissivity within the 8-44um waveband.