Articles | Volume 23, issue 3
Nonlin. Processes Geophys., 23, 127–136, 2016
https://doi.org/10.5194/npg-23-127-2016
Nonlin. Processes Geophys., 23, 127–136, 2016
https://doi.org/10.5194/npg-23-127-2016

Research article 27 May 2016

Research article | 27 May 2016

An improved global zenith tropospheric delay model GZTD2 considering diurnal variations

Yibin Yao et al.

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Short summary
By considering the diurnal variations in zenith tropospheric delay (ZTD) and modifying the model expansion function, we developed an improved global empirical ZTD model GZTD2 with higher temporal and spatial resolutions compared to our previous GZTD model. The external validation testing with IGS ZTD data shows the bias and rms for GZTD2 are −0.3 and 3.9 cm respectively, indicating higher accuracy and reliability for geodesy technology compared to GZTD and other commonly used ZTD models.