Articles | Volume 37, issue 1
Ann. Geophys., 37, 25–36, 2019

Special issue: Advanced Global Navigation Satellite Systems tropospheric...

Ann. Geophys., 37, 25–36, 2019
Regular paper
15 Jan 2019
Regular paper | 15 Jan 2019

Comparisons between the WRF data assimilation and the GNSS tomography technique in retrieving 3-D wet refractivity fields in Hong Kong

Zhaohui Xiong et al.


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Short summary
A comparison between the GNSS tomography technique and WRFDA in retrieving wet refractivity (WR) is conducted in HK during a wet period and a dry period. The results show that both of them can retrieve good WR. In most of the cases, the WRFDA output outperforms the tomographic WR, but the tomographic WR is better than the WRFDA output in the lower troposphere in the dry period. By assimilating better tomographic WR in the lower troposphere into the WRFDA, we slightly improve the retrieved WR.