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    Precipitable water vapor from ground based GPS observations over Southwestern North American: Summer 2002 and 2003

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    Author
    Minjarez Sosa, Carlos Manuel
    Issue Date
    2005
    Advisor
    Kursinski, E. Robert
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    For the first time in North American monsoon related research, ground-based GPS measurements have been used. Two years (2002 and 2003) of precipitable water vapor data estimated for the region of southern Arizona and northern Sonora were studied. Through an examination of PWV differences we found retrievals are approximately lO" = 1.9 mm as good as those calculated by the radiosonde and approximately 3 mm for GOES. Based on the GPS-PWV time series behavior we propose a new definition of the monsoon onset as an alternative to the one used by the NWS. With this definition and thanks to the high GPS time resolution we can contribute to the monsoon onset moisture source discussion since, as shown in Chapter 3, differences of about 1 hour were detected between Douglas and Tucson AZ sites. Using GPS-ET A comparisons we estimated the ETA analysis errors for the Arizona and Sonora GPS sites. The difference Standard deviations obtained for the Sonora sites are up to 1.65 mm greater than those obtained for the Arizona sites, in part as a result of the lack of upper air measurements in Sonora. In the future, these results can help in estimating the impact of errors in the analyses in Sonora on the weather forecasts in Arizona. Furthermore, on a much smaller, local scale, it is shown that the GPS can detect convective activity near the GPS surface site, a strength unknown before this study. We conclude with a perspective on future uses of this technique for the monsoon region of Arizona and Sonora.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Atmospheric Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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