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Generation of real‐time mode high‐resolution water vapor fields from GPS observations

Journal of geophysical research. Atmospheres, 2017-02, Vol.122 (3), p.2008-2025 [Peer Reviewed Journal]

2017. The Authors. ;2017. American Geophysical Union. All Rights Reserved. ;ISSN: 2169-897X ;EISSN: 2169-8996 ;DOI: 10.1002/2016JD025753

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Title:
Generation of real‐time mode high‐resolution water vapor fields from GPS observations
Author: Yu, Chen ; Penna, Nigel T. ; Li, Zhenhong
Subjects: Atmospheric circulation ; Cells ; Climatology ; Coastal zone ; Components ; Decomposition ; Delay ; Elevation ; Errors ; Estimates ; Fields ; Global positioning systems ; GPS ; High resolution ; Imaging techniques ; Infrared spectroscopy ; Interpolation ; Marine ; Mathematical models ; MODIS ; Mountains ; Precipitable water ; precipitable water vapor ; Radar ; Radar imaging ; Real time ; real‐time GPS PPP ; Resolution ; SAR (radar) ; Satellite navigation systems ; Synthetic aperture radar ; Time measurement ; Troposphere ; tropospheric delays ; Turbulence ; Turbulent flow ; Water vapor ; Water vapour ; Weather ; Weather forecasting ; Zenith
Is Part Of: Journal of geophysical research. Atmospheres, 2017-02, Vol.122 (3), p.2008-2025
Description: 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. Key Points An iterative tropospheric decomposition model for zero differenced ZTD interpolation Generation of high‐resolution real‐time mode GPS‐based ZTD and PWV maps Validation of ITD PWV maps with the MODIS near‐IR water vapor product
Publisher: Washington: Blackwell Publishing Ltd
Language: English
Identifier: ISSN: 2169-897X
EISSN: 2169-8996
DOI: 10.1002/2016JD025753
Source: Alma/SFX Local Collection

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Generation of real‐time mode high‐resolution water vapor fields from GPS observations

2017. The Authors. ;2017. American Geophysical Union. All Rights Reserved. ;ISSN: 2169-897X ;EISSN: 2169-8996 ;DOI: 10.1002/2016JD025753

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