Chinese Journal of Oceanology and Limnology

, Volume 5, Issue 4, pp 363–369 | Cite as

Measurement of the surface emissivity of turbid waters

  • Liu Wenyao
  • R. T. Field
  • R. G. Gantt
  • V. Klemas
Article

Abstract

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 8–14 μm waveband.

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References

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    Klemas, V., M. Otley, W. Philpot, and R. Rogers, 1974. Correlation of Coastal Water Turbidity and Circulation with ERTS-1 and Skylab imagery.In: Proc. 9th Int. Symp. Remote Sens. Environ., 15–19 April 1974, Ann Arbor, MI. pp. 1289–1318.Google Scholar
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    Zhang Ken, Qian Ning and Cai Tilu. 1982. An analysis of the conditions of transporting flow with hyperconcentration over a long distance.J. Sediment Res. 3: 1–10.Google Scholar
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    Zhang Youwen and Zhang Caigen 1980. Measurement of the emissivity and radiation temperature of various room temperature materials.Acta Physica Sinica 29(7): 799–835. (in Chinese).Google Scholar

Copyright information

© Science Press 1987

Authors and Affiliations

  • Liu Wenyao
    • 1
  • R. T. Field
    • 2
  • R. G. Gantt
    • 2
  • V. Klemas
    • 2
  1. 1.Tianjin University ChinaTianjinChina
  2. 2.University of DelawareU.S.A.

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