Assessment of Dynamic Downscaling of the Extreme Rainfall over East Asia Using a Regional Climate Model |
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Authors: | GAO Yanhong Yongkang XUE PENG Wen Hyun-Suk KANG and Duane WALISER |
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Institution: | Laboratory for Climate Environment and Disasters of Western China, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,Department of Geography and Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA,Laboratory for Climate Environment and Disasters of Western China, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,Climate Research Laboratory National Institute of Meteorological Research Korea Meteorological Administration, Korea,et Propulsion Laboratory/California Institute of Technology, California, USA |
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Abstract: | This study investigates the capability of the dynamic downscaling method (DDM) in an East Asian climate study
for June 1998 using the fifth-generation Pennsylvania State University--National Center for
Atmospheric Research non-hydrostatic Mesoscale Model (MM5). Sensitivity
experiments show that MM5 results at upper atmospheric levels cannot match
reanalyses data, but the results show consistent improvement in simulating
moisture transport at low levels. The downscaling ability for precipitation
is regionally dependent. During the monsoon season over the Yangtze River
basin and the pre-monsoon season over North China, the DDM cannot match
observed precipitation. Over Northwest China and the Tibetan Plateau (TP),
where there is high topography, the DDM shows better performance than
reanalyses. Simulated monsoon evolution processes over East Asia, however,
are much closer to observational data than reanalyses. The convection scheme
has a substantial impact on extreme rainfall over the Yangtze River basin
and the pre-monsoon over North China, but only a marginal contribution for
Northwest China and the TP. Land surface parameterizations affect the
locations and pattern of rainfall bands. The 10-day re-initialization in
this study shows some improvement in simulated precipitation over some
sub-regions but with no obvious improvement in circulation. The setting of
the location of lateral boundaries (LLB) westward improves performance of
the DDM. Including the entire TP in the western model domain improves the
DDM performance in simulating precipitation in most sub-regions. In
addition, a seasonal simulation demonstrates that the DDM can also obtain
consistent results, as in the June case, even when another two months
consist of no strong climate/weather events. |
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Keywords: | DDM MM5 cumulus convection scheme land parameterization re-initialization lateral boundary location |
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