On the feasibility of measuring sea surface temperature using active and passive microwave sensors
作者:
C. L. RUFENACH,
R. A. SHUCHMAN,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1992)
卷期:
Volume 13,
issue 5
页码: 957-964
ISSN:0143-1161
年代: 1992
DOI:10.1080/01431169208904169
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We study the feasibility of using a dual linear-polarized radiometer operating at 6 GHz in conjunction with a scatterometer as a method of extracting sea surface temperature. A model, originally developed by Wilheit (1979), is used to investigate the sensitivity of radiometric temperature to changes in wind speed, U, at a height of 20 m; that is, the accuracy of sea temperature depends directly on the accuracy of radiometric temperature. These changes are corrected using this extracted wind speed based on a scatterometer wind accuracy of ± 1 ms−1. We show that a vertically polarized radiometer is less sensitive to wind speed changes than a horizontally polarized one near an incidence angle © = 60°. Furthermore, we quantify the wind variation; δTBH/δU≲;0.12°Cms−1s when U>I0ms−1and δTHB/δU≲;2.0°Cm−1when U>6ms−1for vertical and horizontal polarization, respectively. Thus, the resulting error is ± 0I2°C and ±20°C for TBVand THB, respectively. These results suggest that a scatterometer can be used to correct the wind speed dependence of a vertically polarized radiometer operating near 6 GHz using a pencil antenna beam pointing at an incidence angle near 57°.
点击下载:
PDF (163KB)
返 回