Impact analysis of processing strategies for long-term GPS zenith tropospheric delay (ZTD)

Bai, Jingna; Lou, Yidong; Zhang, Weixing; Zhou, Yaozong; Zhang, Zhenyi; Shi, Chuang; Liu, Jingnan

doi:https://doi.org/10.5194/amt-16-5249-2023

Articles | Volume 16, issue 21

https://doi.org/10.5194/amt-16-5249-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-16-5249-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 21

Research article

|

07 Nov 2023

Research article |

| 07 Nov 2023

Impact analysis of processing strategies for long-term GPS zenith tropospheric delay (ZTD)

Jingna Bai, Yidong Lou, Weixing Zhang, Yaozong Zhou, Zhenyi Zhang, Chuang Shi, and Jingnan Liu

Data sets

GPS data and products archive International GNSS Service ftp://gdc.cddis.eosdis.nasa.gov/pub/gps/data/daily/

ERA5 hourly data on pressure levels from 1979 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut https://doi.org/10.24381/cds.bd0915c6

IGRA data National Climate Data Center https://www.ncei.noaa.gov/data/integrated-global-radiosonde-archive/access/data-por/

Short summary

Homogenized atmospheric water vapor data are an important prerequisite for climate analysis. Compared to other techniques, GPS has an inherent homogeneity advantage but requires reprocessing and homogenization to eliminate impacts of applied strategy and observation environmental changes. The low-elevation cut-off angles are suggested for the best estimates of zenith tropospheric delay (ZTD) reprocessing time series when compared to homogenized radiosonde data or ERA5 reference time series.