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Comparison of GPS slant wet delay measurements with model simulations during the passage of a squall line
Author(s) -
Ha SoYoung,
Kuo YingHwa,
Guo YongRun,
Rocken Chris,
Van Hove Teresa
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015891
Subject(s) - squall line , mesoscale meteorology , global positioning system , environmental science , geology , meteorology , line (geometry) , remote sensing , climatology , computer science , physics , telecommunications , geometry , mathematics
Slant wet delay (SWD) measurements from a ground‐based GPS observation network provide accurate, high‐resolution moisture information for mesoscale analysis. In this study, we compared SWD simulated from a 9‐km MM5 model in a prefrontal squall line event against actual GPS SWD observations by NOAA's GPS network. We found that the model simulation did not capture abrupt moisture changes and small‐scale variations observed in the nonisotropic component of slant wet delays associated with the squall line. This result suggests that SWD measurements can be very useful in improving model moisture analysis.