DOI: 10.1002/grl.50288
论文题名: GPT2: Empirical slant delay model for radio space geodetic techniques
作者: Lagler K. ; Schindelegger M. ; Böhm J. ; Krásná H. ; Nilsson T.
刊名: Geophysical Research Letters
ISSN: 0094-9230
EISSN: 1944-8961
出版年: 2013
卷: 40, 期: 6 起始页码: 1069
结束页码: 1073
语种: 英语
英文关键词: GNSSl
; Tropospheric delay
; Tropospheric mapping function
Scopus关键词: Amplitude difference
; GNSSl
; Mapping functions
; Numerical weather model
; Pressure and temperature
; Spatial and temporal variability
; Tropospheric delays
; Very long baseline interferometry
; Dielectric properties
; Geodesy
; Radio astronomy
; Troposphere
; amplitude
; climate modeling
; data set
; empirical analysis
; geodetic datum
; GNSS
; interferometry
; mapping method
; numerical model
; pressure effect
; spatiotemporal analysis
; temperature effect
; troposphere
英文摘要: Up to now, state-of-the-art empirical slant delay modeling for processing observations from radio space geodetic techniques has been provided by a combination of two empirical models. These are GPT (Global Pressure and Temperature) and GMF (Global Mapping Function), both operating on the basis of long-term averages of surface values from numerical weather models. Weaknesses in GPT/GMF, specifically their limited spatial and temporal variability, are largely eradicated by a new, combined model GPT2, which provides pressure, temperature, lapse rate, water vapor pressure, and mapping function coefficients at any site, resting upon a global 5° grid of mean values, annual, and semi-annual variations in all parameters. Built on ERA-Interim data, GPT2 brings forth improved empirical slant delays for geophysical studies. Compared to GPT/GMF, GPT2 yields a 40% reduction of annual and semi-annual amplitude differences in station heights with respect to a solution based on instantaneous local pressure values and the Vienna mapping functions 1, as shown with a series of global VLBI (Very Long Baseline Interferometry) solutions. Key Points Refined tropospheric delay model based on ERA-Interim Excellent match of empirical model pressure to in-situ pressure values Improved station height estimates deduced from VLBI observations. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876949102&doi=10.1002%2fgrl.50288&partnerID=40&md5=7cb6e9252267d10c3d55aaa35bc39a97
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6494
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geodesy and Geoinformation (Research Group Advanced Geodesy), Vienna University of Technology, Vienna, Austria
Recommended Citation:
Lagler K.,Schindelegger M.,Böhm J.,et al. GPT2: Empirical slant delay model for radio space geodetic techniques[J]. Geophysical Research Letters,2013-01-01,40(6).