Global GPS IWV - IGS repro1 - v1.2 |
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Dataset Description |
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| DOI | |
| Project | VEGA (LEFE/INSU) |
| Period | 1-Jan-1995 to 31-Dec-2010 |
| Contact | Bock Olivier (IGN-LAREG) |
| Abstract | Global GPS IWV data at 120 stations of IGS permanent network |
| Observing Strategy | Merged GPS ZTD data from IGS-repro1 solution (1995-2007) + IGS trop_new (2008-2010) at 5 min resolution. IGS repro1 was reprocessed by JPL with GIPSY OASIS software in May 2010. IGS tropo_new was reprocessed by JPL with GIPSY OASIS software in July 2010. GPS ZTD screening is based on range check and outlier check of ZTD and formal errors at nominal temporal resolution. Hourly GPS ZTD means are computed from all values in 1-h intervals centred on integer UTC hours (minimum used : 4 values per hour). GPS ZTD hourly to IWV 6-hourly conversion uses ZHD & Tm computed from ERA-Interim pressure level data (with bi-linear horizontal interpolation from 4 grid points). Daily means are computed from hourly values at 00, 06, 12, 18, 24UTC with weights [0.5 1 1 1 0.5]. Monthly means are computed from all daily values (minimum used : 15 values per month). |
Changes to v1:
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Byun, S. H., and Y. E. Bar-Server (2009), A new type of troposphere zenith path delay product of the international GNSS service, J. Geod. 83(3-4), 367-373, doi:10.1007/s00190-008-0288-8. | |
IGSMAIL-6298 (2012), Reprocessed IGS Trop Product now available with Gradients, by Yoaz Bar-Sever, 11 November. [Available at https://igscb.jpl.nasa.gov/pipermail/igsmail/2010/007488.html.] | |
Bock, O., P. Willis, J. Wang, C. Mears (2014) A high-quality, homogenized, global, long-term (1993-2008) DORIS precipitable water dataset for climate monitoring and model verification, J. Geophys. Res., Atmospheres, 119(12): 7209-7230, doi: 10.1002/2013JD021124 |
| Location | Ground-based GNSS networks |
| Site Type | Ground networks |
| Measured Parameters | |
|---|---|
| Parameter Name | ZTD (zenith tropospheric delay) |
| Parameter Keywords | Atmosphere |
| Units | meter - m |
| Acquisition methodology and quality | ZTD parameters are from IGS-repro1 solution (1995-2007) and IGS trop_new (2008-2010) at 5 min resolution. |
| Temporal Coverage | 1995-01-01 to 2010-12-31 |
| Derived Parameters | |
|---|---|
| Parameter Name | Precipitable Water |
| Parameter Keywords | Atmosphere > Atmospheric Water Vapor > Precipitable Water |
| Units | kilogram per square metre - kg/m2 |
| Acquisition methodology and quality | Precipitable Water (PW) or Integrated Water Vapour (IWV) is converted from ZTD using formula: IWV = K(Tm) * (ZTD - ZHD); K(Tm) and ZHD are computed from ERA-Interim pressure level data. |
| Temporal Coverage | 1995-01-01 to 2010-12-31 |
| Sensor precision | 1-2 kg/m2 |
| Use constraints | Permission is granted to use these data in research and publications when accompanied by the following statement: "The GPS IWV data were obtained from the VEGA project sponsored by French national program LEFE/INSU" The users should contact the principal investigator to agree either co-authorship or aknowledgement. |
| Data format | ASCII |
| Data Access |