Applicability of Bevis formula at different height level and global weighted mean temperature model based on near-earth atmospheric temperature

doi:10.11947/j.AGCS.2019.20180160

Abstract

Abstract:

Weighted mean temperature is a critical parameter in GNSS technology to retrieve precipitable water vapor (PWV). It is convenient to obtain high-accuracy T_m estimation near surface utilizing Bevis formula and surface temperature. However, some researches pointed out that the Bevis formula has large uncertainties in high-altitude regions. This paper researches the applicability of Bevis formula at different height levels and finds that the Bevis formula has relatively high precision when the altitude is low, while with altitude increasing, the precision decreases gradually. To solve the problem, this paper studies the relationship between T_m and atmospheric temperature of the near-earth space range (the height range between 0~10 km) and finds that they have high correlation on a global scale. Accordingly, this paper builds a global weighted mean temperature model based on near-earth atmospheric temperature. Validation results of the model show that this model can provide high-accuracy T_m estimation at any height level in the near-earth space range.

Key words: weighted mean temperature, Bevis formula, near-earth atmospheric temperature, global model

CLC Number:

P228

YAO Yibin, SUN Zhangyu, XU Chaoqian. Applicability of Bevis formula at different height level and global weighted mean temperature model based on near-earth atmospheric temperature[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(3): 276-285.

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