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Modified Bowen ratio method in near-sea-surface air temperature estimation by using satellite data

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4 Author(s)
Chung-Chih Liu ; Air Force Inst. of Technol., Gang-Shan, Taiwan ; Gin-Rong Liu ; Wann-Jin Chen ; Hong-Yu Yang

The near-sea-surface air temperature can be derived through Special Sensor Microwave/Imager (SSM/I) microwave and Geostationary Meteorological Satellite (GMS-5) infrared data by using a so-called modified Bowen ratio method (MBRM). A specified value (κ) that was defined to be a ratio between bulk coefficients ce and ch was viewed as a constant and was input into this retrieval model for the derivation of near-sea-surface air temperature. However, there is insufficient evidence to prove the hypothesis why the specified value can be viewed as a constant and used in this model. This study strives in providing an answer. By using the iterative technique, the fact that the optimal κ value oscillated merely within a small range for present experimental area covering the area from 10°N to 30°N and 105°E to 135°E is shown clearly. The small oscillation does not strongly affect the value of the derived near-sea-surface air temperature. Therefore, the optimal κ value could be considered as a constant both temporally and spatially. Moreover, the results show that the rmse of the estimated near-sea-surface air temperature from SSM/I and GMS-5 data are 1.46 and 1.69 K, respectively. Therefore, the MBRM may be a good approach to estimate this parameter. However, the optimal κ proposed in this study may be suitable only to present experimental area. Generally speaking, this is due to the fact that the κ values are usually larger further to the north (in higher latitudes) than to the south (in lower latitudes) and also during the cold season than in the warm season.

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:41 ,  Issue: 5 )

Date of Publication:

May 2003

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