An optimal tropospheric tomography approach with the support of an auxiliary area
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TLDR
In this article, the authors proposed an optimized tropospheric tomography method using an auxiliary area to estimate the top height of the tomography body based on the average water vapour distribution derived from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation (RO) products.Abstract:
. Among most current
tropospheric tomography studies, only the signals crossing out from the top
boundary of the tomographic area are used for reconstructing the
three-dimensional water vapour field, while signals penetrating from the side
faces of the tomographic body are ignored as invalid information. Such a
method wastes the valuable Global Navigation Satellite System (GNSS)
observations and decreases the utilisation efficiency of GNSS rays. This is
the focus of this paper, which tries to effectively use signals penetrating
from the side faces of the tomographic body for water vapour reconstruction.
An optimised tropospheric tomography method is proposed using an auxiliary
area. The top height of the tomography body is determined based on the
average water vapour distribution derived from the Constellation Observing
System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation
(RO) products. In addition, the coefficients of a negative exponential
function between the adjacent layers for vertical constraints are fitted
using the COSMIC RO profiles. Thirteen GPS stations are selected in the CORS
Network of Texas to perform the tomographic experiment and validate the
performance of the proposed method at 00:00 and 12:00 UTC daily using the
radiosonde data for a period of 15 days. Compared to the conventional method,
the accuracy of the reconstructed water vapour information derived from the
proposed method is increased by 14.37 % and 16.13 %, respectively, in
terms of mean root mean square (rms) and mean
absolute error (MAE). The tomographic results obtained from the proposed
method are further validated with the slant water vapour (SWV) data derived
using the GAMIT (GNSS processing software package). Results show that the rms
and MAE accuracy of SWV values has been improved by 18.18 % and
27.62 %, respectively, when compared to the conventional method. Keywords. History of geophysics (atmospheric sciences)read more
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References
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GPS Meteorology: Remote Sensing of Atmospheric Water Vapor Using the Global Positioning System
Michael Bevis,Steven Businger,Thomas A. Herring,Christian Rocken,Richard A. Anthes,Randolph H. Ware +5 more
TL;DR: In this paper, the authors presented a new approach to remote sensing of water vapor based on the global positioning system (GPS) for estimating the extent to which signals propagating from GPS satellites to ground-based GPS receivers are delayed by atmospheric water vapor.
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Initial reference models in local earthquake tomography
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GPS Meteorology: Direct Estimation of the Absolute Value of Precipitable Water
Jingping Duan,Michael Bevis,Peng Fang,Yehuda Bock,Steven R. Chiswell,Steven Businger,Christian Rocken,Frederick S. Solheim,Terasa van Hove,Randolph H. Ware,Simon McClusky,Thomas A. Herring,Robert W. King +12 more
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Sensing atmospheric water vapor with the global positioning system
Christian Rocken,Randolph H. Ware,Teresa Van Hove,Fredrick Solheim,Chris Alber,James R. Johnson,Michael Bevis,Steven Businger +7 more
TL;DR: In this article, the precipitable water vapor (PWV) and wet delay in the line-of-sight to GPS satellites were measured at both ends of a 50-kin baseline in Colorado.
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