Reference : Evaluation of ERA-Interim for tropospheric delay and water vapour estimation in diffe...

	Document type :	Scientific congresses, symposiums and conference proceedings : Poster
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	Focus Areas :	Computational Sciences
	To cite this reference:	http://hdl.handle.net/10993/30725

Title :	Evaluation of ERA-Interim for tropospheric delay and water vapour estimation in different climate zones using ground-based GNSS observations
Language :	English
Author, co-author :	Ahmed, Furqan [University of Texas at Austin]
	Hunegnaw, Addisu [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	Teferle, Felix Norman [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	Bingley, Richard [University of Nottingham]
Publication date :	27-Apr-2017
Number of pages :	1,3 x 0,9 m
Peer reviewed :	No
On invitation :	No
Audience :	International
Event name :	European Geoscience Union General Assembly 2017
Event date :	23-04-2017 to 28-04-2017
Event organizer :	European Geosciences Union
Event place (city) :	Vienne
Event country :	Austria
Keywords :	[en] Global Navigation Satellite System ; Troposhperic Signal Delay ; Re-analysis Models ; ERA-Interim ; Climatic Zones ; Integrated Water Vapour
Abstract :	[en] Tropospheric delay and integrated water vapour (IWV) derived from climate reanalysis models, such as that of the European Centre for Medium-range Weather Forecasts (ECMWF) namely the ECMWF ReAnalysis-Interim (ERA-Interim), are widely used in many geodetic and atmospheric applications. Therefore, it is of interest to assess the quality of these reanalysis products using available observations. Observations from Global Navigation Satellite Systems (GNSS) are, as of now, available for a period of over 2 decades and their global availability make it possible to validate the zenith total delay (ZTD) and IWV obtained from climate reanalysis models in different geographical and climatic regions. In this study, a 5-year long homogeneously reprocessed GNSS data set based on double differenced positioning strategy and containing over 400 globally distributed ground-based GNSS stations has been used as a reference to validate the ZTD estimates obtained from the ERA-Interim climate reanalysis model in 25 different climate zones. It has been studied how the difference between the ERA-Interim ZTD and the GNSS-derived ZTD varies with respect to the different climate zones as well as the topographic variations in a particular climate zone. Periodicity in the ZTD residuals in different climate zones has been analyzed. Furthermore, the variation of the ZTD differences with respect to latitude has been presented. Finally, for one GNSS station in each of the 25 climate zones, IWV derived from ERA-Interim has been compared to the IWV derived using GNSS observations.
Research centres :	University of Luxembourg: High Performance Computing - ULHPC
Funders :	Fonds National de la Recherche - FnR ; University of Luxembourg - UL
Name of the research project :	PWVLUX and SGSL
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/10993/30725
FnR project :	FnR ; FNR1090247 > Furqan Ahmed > PWVLUX > The Potential of Precipitable Water Vapour Measurements from Global Navigation Satellite Systems in Luxembourg > 01/06/2011 > 31/05/2015 > 2010

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	Fulltext file(s): File Commentary Version Size Access Open access EGUP2017-19456_Final.pdf Poster as presented Author postprint 7.95 MB View/Open

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