A new type of troposphere zenith path delay product of the international GNSS service

Byun, Sung; Bar-Sever, Y.

doi:10.1007/s00190-008-0288-8

Cited by 181 publications

(124 citation statements)

References 9 publications

(8 reference statements)

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…95 % of the ZTDs have a formal error below 2.6 mm and 99.9 % of them have a formal error below 4.4 mm. This is somewhat better than in Byun and Bar-Sever (2009) 8-2,99 3,2-3,39 3,6-3,79 4-4,19 4,4-4,59 4,8-4,99 5,2-5,39 5,6-5,79 6-6,19 6,4-6,59 6,8-6,99 7,2-7,39 7,6-7,79 8-8,19 8,4-8,59 8,8-8,99 9,2-9,39 9,6-9,79 10-10,19 Percentage analysed a subset of 30 globally distributed IGS stations during 2003 and found a formal error between 1.5 and 5 mm of ZTD. Of course, this formal error does not take into account systematic errors (e.g.…”

Section: Uncertainty Of the Gps-based Iwvmentioning

confidence: 68%

A multi-site intercomparison of integrated water vapour observations for climate change analysis

et al. 2014

View full text Add to dashboard Cite

Abstract. Water vapour plays a dominant role in the climate change debate. However, observing water vapour over a climatological time period in a consistent and homogeneous manner is challenging. On one hand, networks of groundbased instruments able to retrieve homogeneous integrated water vapour (IWV) data sets are being set up. Typical examples are Global Navigation Satellite System (GNSS) observation networks such as the International GNSS Service (IGS), with continuous GPS (Global Positioning System) observations spanning over the last 15+ years, and the AErosol RObotic NETwork (AERONET), providing long-term observations performed with standardized and well-calibrated sun photometers. On the other hand, satellite-based measurements of IWV already have a time span of over 10 years (e.g. AIRS) or are being merged to create long-term time series (e.g. GOME, SCIAMACHY, and GOME-2).This study performs an intercomparison of IWV measurements from satellite devices (in the visible, GOME/SCIAMACHY/GOME-2, and in the thermal infrared, AIRS), in situ measurements (radiosondes) and ground-based instruments (GPS, sun photometer), to assess their use in water vapour trends analysis. To this end, we selected 28 sites world-wide for which GPS observations can directly be compared with coincident satellite IWV observations, together with sun photometer and/or radiosonde measurements. The mean biases of the different techniques compared to the GPS estimates vary only between −0.3 to 0.5 mm of IWV. Nevertheless these small biases are accompanied by large standard deviations (SD), especially for the satellite instruments. In particular, we analysed the impact of clouds on the IWV agreement. The influence of specific issues for each instrument on the intercomparison is also investigated (e.g. the distance between the satellite ground pixel centre and the co-located ground-based station, the satellite scan angle, daytime/nighttime differences). Furthermore, we checked if the properties of the IWV scatter plots between these different instruments are dependent on the geography and/or altitude of the station. For all considered instruments, the only dependency clearly detected is with latitude: the SD of the IWV observations with respect to the GPS IWV retrievals decreases with increasing latitude and decreasing mean IWV.

show abstract

Section: Uncertainty Of the Gps-based Iwvmentioning

confidence: 68%

A multi-site intercomparison of integrated water vapour observations for climate change analysis

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In 2008, the International GNSS Service (IGS) initiated global GNSS data reprocessing campaign (IGS-repro1, Rebischung et al, 2012;Byun and Bar-Sever, 2009). Nine IGS analysis centres contributed to reanalysing the GPS data collected by the IGS global permanent network since 1994 in a fully consistent way using the latest models and methodology.…”

Section: Gnss Data Setsmentioning

confidence: 99%

The Sofia University Atmospheric Data Archive (SUADA)

2014

View full text Add to dashboard Cite

Abstract. Atmospheric sounding using the Global Navigation Satellite Systems (GNSS) is a well-established research field in Europe. At present, GNSS data from 1800 stations are available for model validation and assimilation in stateof-the-art models used for operational numerical weather prediction centres in Europe. Advances in GNSS data processing make it possible also to use the GNSS data for climatic trend analysis, an emerging new application. In Bulgaria and southeastern Europe, the use of GNSS for atmospheric sounding is currently under development.As a first step, the Sofia University Atmospheric Data Archive (SUADA) is developed. SUADA is a user-friendly database, and includes GNSS tropospheric products like zenith total delay (ZTD) and derivatives like vertically integrated water vapour (IWV), as well as observations from radiosonde (RS) and surface atmospheric data. Archived in SUADA are (1) GNSS tropospheric products (over 12 000 000 individual observations) and derivatives (over 55 000) from five GNSS processing strategies and 37 stations for the period 1997-2013, with temporal resolutions from 5 min to 6 h, and (2) radiosonde IWV data (over 6000 observations) for station Sofia (1999Sofia ( -2012.Presented are two applications of the SUADA data for the study of long-and short-term variations of IWV over Bulgaria during the 2007 heatwave and intense precipitation events in 2012.

show abstract

“…We use the GAMIT software (King and Bock 1999), which solves for the ZTD and other parameters using a constrained batch least squares inversion procedure. In addition, this study uses the newly recommended strategies (Byun et al 2005) to calculate ZTD time series with temporal resolution of 2 hours from 1994 to 2006. The GAMIT software parameterizes ZTD as a stochastic variation from the Saastamoinen model (Saastamoinen 1972), with piecewise linear interpolation in between solution epochs.…”

Section: Zenith Tropospheric Delay Retrievalmentioning

confidence: 99%

GNSS Atmospheric and Ionospheric Sounding – Methods and Results

Jin¹

2012

Global Navigation Satellite Systems: Signal, Theory and Applications

View full text Add to dashboard Cite

A new type of troposphere zenith path delay product of the international GNSS service

Cited by 181 publications

References 9 publications

A multi-site intercomparison of integrated water vapour observations for climate change analysis

A multi-site intercomparison of integrated water vapour observations for climate change analysis

The Sofia University Atmospheric Data Archive (SUADA)

GNSS Atmospheric and Ionospheric Sounding – Methods and Results

Contact Info

Product

Resources

About