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The uncertainty of ...
The uncertainty of the atmospheric integrated water vapour estimated from GNSS observations
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- Ning, Tong, 1975 (author)
- Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ),Chalmers tekniska högskola,Chalmers University of Technology
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- Wang, J (author)
- State University of New York Albany
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- Elgered, Gunnar, 1955 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Dick, G (author)
- Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)
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- Wickert, J (author)
- Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)
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- Bradke, M (author)
- Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)
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- Sommer, M (author)
- Deutscher Wetterdienst
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- Querel, Richard (author)
- National Institute of Water and Atmospheric Research (NIWA)
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- Smale, D. (author)
- National Institute of Water and Atmospheric Research (NIWA)
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(creator_code:org_t)
- 2016-01-18
- 2016
- English.
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In: Atmospheric Measurement Techniques. - : Copernicus GmbH. - 1867-1381 .- 1867-8548. ; 9:1, s. 79-92
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Abstract
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- Within the Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN) there is a need for an assessment of the uncertainty in the integrated water vapour (IWV) in the atmosphere estimated from ground-based global navigation satellite system (GNSS) observations. All relevant error sources in GNSS-derived IWV are therefore essential to be investigated. We present two approaches,a statistical and a theoretical analysis, for the assessmentof the uncertainty of the IWV. The method is valuable for all applications of GNSS IWV data in atmospheric research and weather forecast. It will be implemented to theGNSS IWV data stream for GRUAN in order to assign aspecific uncertainty to each data point. In addition, specific recommendations are made to GRUAN on hardware, software,and data processing practices to minimise the IWV uncertainty. By combining the uncertainties associated with the input variables in the estimations of the IWV, we calculated the IWV uncertainties for several GRUAN sites with different weather conditions. The results show a similar relative importance of all uncertainty contributions where the uncertainties in the zenith total delay (ZTD) dominate the error budget of the IWV, contributing over 75% of the total IWV uncertainty. The impact of the uncertainty associated with the conversion factor between the IWV and the zenith wet delay (ZWD) is proportional to the amount of water vapour and increases slightly for moist weather conditions. The GRUAN GNSS IWV uncertainty data will provide a quantified confidence to be used for the validation of other measurement techniques.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Ning, Tong, 1975
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Wang, J
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Elgered, Gunnar, ...
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Dick, G
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Wickert, J
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Bradke, M
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show more...
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Sommer, M
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Querel, Richard
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Smale, D.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
- Articles in the publication
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Atmospheric Meas ...
- By the university
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Chalmers University of Technology