DOI: 10.1002/2016JD025753
论文题名: Generation of real-time mode high-resolution water vapor fields from GPS observations
作者: Yu C. ; Penna N.T. ; Li Z.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 2008
结束页码: 2025
语种: 英语
英文关键词: MODIS
; precipitable water vapor
; real-time GPS PPP
; tropospheric delays
Scopus关键词: decomposition
; elevation
; GPS
; interpolation
; kinematics
; MODIS
; precipitable water
; real time
; spatial resolution
; synthetic aperture radar
; troposphere
; water vapor
; weather forecasting
; zenith angle
; California
; United States
英文摘要: Pointwise GPS measurements of tropospheric zenith total delay can be interpolated to provide high-resolution water vapor maps which may be used for correcting synthetic aperture radar images, for numeral weather prediction, and for correcting Network Real-time Kinematic GPS observations. Several previous studies have addressed the importance of the elevation dependency of water vapor, but it is often a challenge to separate elevation-dependent tropospheric delays from turbulent components. In this paper, we present an iterative tropospheric decomposition interpolation model that decouples the elevation and turbulent tropospheric delay components. For a 150 km × 150 km California study region, we estimate real-time mode zenith total delays at 41 GPS stations over 1 year by using the precise point positioning technique and demonstrate that the decoupled interpolation model generates improved high-resolution tropospheric delay maps compared with previous tropospheric turbulence- and elevation-dependent models. Cross validation of the GPS zenith total delays yields an RMS error of 4.6 mm with the decoupled interpolation model, compared with 8.4 mm with the previous model. On converting the GPS zenith wet delays to precipitable water vapor and interpolating to 1 km grid cells across the region, validations with the Moderate Resolution Imaging Spectroradiometer near-IR water vapor product show 1.7 mm RMS differences by using the decoupled model, compared with 2.0 mm for the previous interpolation model. Such results are obtained without differencing the tropospheric delays or water vapor estimates in time or space, while the errors are similar over flat and mountainous terrains, as well as for both inland and coastal areas. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62679
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Yu C.,Penna N.T.,Li Z.. Generation of real-time mode high-resolution water vapor fields from GPS observations[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)