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contributor authorXue, Yongkang
contributor authorVasic, Ratko
contributor authorJanjic, Zavisa
contributor authorMesinger, Fedor
contributor authorMitchell, Kenneth E.
date accessioned2017-06-09T17:03:29Z
date available2017-06-09T17:03:29Z
date copyright2007/08/01
date issued2007
identifier issn0894-8755
identifier otherams-78700.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221397
description abstractThis study investigates the capability of the dynamic downscaling method (DDM) in a North American regional climate study using the Eta/Simplified Simple Biosphere (SSiB) Regional Climate Model (RCM). The main objective is to understand whether the Eta/SSiB RCM is capable of simulating North American regional climate features, mainly precipitation, at different scales under imposed boundary conditions. The summer of 1998 was selected for this study and the summers of 1993 and 1995 were used to confirm the 1998 results. The observed precipitation, NCEP?NCAR Global Reanalysis (NNGR), and North American Regional Reanalysis (NARR) were used for evaluation of the model?s simulations and/or as lateral boundary conditions (LBCs). A spectral analysis was applied to quantitatively examine the RCM?s downscaling ability at different scales. The simulations indicated that choice of domain size, LBCs, and grid spacing were crucial for the DDM. Several tests with different domain sizes indicated that the model in the North American climate simulation was particularly sensitive to its southern boundary position because of the importance of moisture transport by the southerly low-level jet (LLJ) in summer precipitation. Among these tests, only the RCM with 32-km resolution and NNGR LBC or with 80-km resolution and NARR LBC, in conjunction with appropriate domain sizes, was able to properly simulate precipitation and other atmospheric variables?especially humidity over the southeastern United States?during all three summer months?and produce a better spectral power distribution than that associated with the imposed LBC (for the 32-km case) and retain spectral power for large wavelengths (for the 80-km case). The analysis suggests that there might be strong atmospheric components of high-frequency variability over the Gulf of Mexico and the southeastern United States.
publisherAmerican Meteorological Society
titleAssessment of Dynamic Downscaling of the Continental U.S. Regional Climate Using the Eta/SSiB Regional Climate Model
typeJournal Paper
journal volume20
journal issue16
journal titleJournal of Climate
identifier doi10.1175/JCLI4239.1
journal fristpage4172
journal lastpage4193
treeJournal of Climate:;2007:;volume( 020 ):;issue: 016
contenttypeFulltext


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