Article Type:
Research Article

Analysis of 2002 and 2003 Warm-Season Precipitation from the North American Monsoon Experiment Event Rain Gauge Network

David J. Gochis National Center for Atmospheric Research,* Boulder, Colorado

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Alejandro Jimenez Instituto del Medio Ambiente y Desarrollo Sustentable, Hermosillo, Sonora, Mexico

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Christopher J. Watts Instituto del Medio Ambiente y Desarrollo Sustentable, Hermosillo, Sonora, Mexico

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Jaime Garatuza-Payan Instituto Tecnologia de Sonora, Ciudad Obregon, Sonora, Mexico

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W. James Shuttleworth Department of Hydrology and Water Resources, The University of Arizona, Tucson, Arizona

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Print Publication:
01 Dec 2004
DOI:
https://doi.org/10.1175/MWR2838.1
Page(s):
2938–2953
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Abstract

Analyses of rainfall characteristics and their linkage to physiographic features are made from the North American monsoon experiment (NAME) Event Rain Gauge Network (NERN) in northwest Mexico. The findings are based on the network configuration for the 2002 and 2003 warm seasons. Despite the relatively short record used, a clearer structure of core-region monsoon rainfall is beginning to emerge. In agreement with earlier, coarser-scale studies, the seasonal precipitation maximum overlies the western slope of the Sierra Madre Occidental but does not strictly parallel a particular elevation band. It is shown that the distance to the Gulf of California and, potentially, the configuration of the terrain profile may also play an important role in determining where the axis of maximum precipitation lies. The diurnal cycles of precipitation frequency and intensity are shown to have distinct relationships to terrain elevation that are qualitatively similar to those observed over the Front Range of the Rocky Mountains in the central-western United States. The relationship between precipitation and gulf surge events occurring during the summer of 2003 is also explored.

Corresponding author address: David J. Gochis, National Center for Atmospheric Research, Research Applications Program/Advanced Study Program, P.O. Box 3000, Boulder, CO 80307-3000. Email: gochis@rap.ucar.edu

Abstract

Analyses of rainfall characteristics and their linkage to physiographic features are made from the North American monsoon experiment (NAME) Event Rain Gauge Network (NERN) in northwest Mexico. The findings are based on the network configuration for the 2002 and 2003 warm seasons. Despite the relatively short record used, a clearer structure of core-region monsoon rainfall is beginning to emerge. In agreement with earlier, coarser-scale studies, the seasonal precipitation maximum overlies the western slope of the Sierra Madre Occidental but does not strictly parallel a particular elevation band. It is shown that the distance to the Gulf of California and, potentially, the configuration of the terrain profile may also play an important role in determining where the axis of maximum precipitation lies. The diurnal cycles of precipitation frequency and intensity are shown to have distinct relationships to terrain elevation that are qualitatively similar to those observed over the Front Range of the Rocky Mountains in the central-western United States. The relationship between precipitation and gulf surge events occurring during the summer of 2003 is also explored.

Corresponding author address: David J. Gochis, National Center for Atmospheric Research, Research Applications Program/Advanced Study Program, P.O. Box 3000, Boulder, CO 80307-3000. Email: gochis@rap.ucar.edu

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