BROWSE

Related Researcher

Author's Photo

Lee, Myong-In
Climate-Environment Modeling Lab
Research Interests
  • Climate Change, Seasonal Prediction, Extreme Weather, Aerosol

ITEM VIEW & DOWNLOAD

Sensitivity to horizontal resolution in the AGCM simulations of warm season diurnal cycle of precipitation over the United States and northern Mexico

Cited 37 times inthomson ciCited 0 times inthomson ci
Title
Sensitivity to horizontal resolution in the AGCM simulations of warm season diurnal cycle of precipitation over the United States and northern Mexico
Author
Lee, Myong-InSchubert, Siegfried D.Suarez, Max J.Held, Isaac M.Kumar, ArunBell, Thomas L.Schemm, Jae-Kyung E.Lau, Ngar-CheungPloshay, Jeffrey J.Kim, Hyun-KyungYoo, Soo-Hyun
Keywords
GENERAL-CIRCULATION MODEL; LOW-LEVEL JET; GREAT-PLAINS; CLIMATE MODEL; SEMIDIURNAL VARIATIONS; GLOBAL PRECIPITATION; MOISTURE TRANSPORT; HYDROLOGIC-CYCLE; VARIABILITY; CONVECTION
Issue Date
2007-05
Publisher
AMER METEOROLOGICAL SOC
Citation
JOURNAL OF CLIMATE, v.20, no.9, pp.1862 - 1881
Abstract
This study examines the sensitivity of the North American warm season diurnal cycle of precipitation to changes in horizontal resolution in three atmospheric general circulation models, with a primary focus on how the parameterized moist processes respond to improved resolution of topography and associated local/regional circulations on the diurnal time scale. It is found that increasing resolution (from approximately 2° to 1/2° in latitude-longitude) has a mixed impact on the simulated diurnal cycle of precipitation. Higher resolution generally improves the initiation and downslope propagation of moist convection over the Rockies and the adjacent Great Plains. The propagating signals, however, do not extend beyond the slope region, thereby likely contributing to a dry bias in the Great Plains. Similar improvements in the propagating signals are also found in the diurnal cycle over the North American monsoon region as the models begin to resolve the Gulf of California and the surrounding steep terrain. In general, the phase of the diurnal cycle of precipitation improves with increasing resolution, though not always monotonically. Nevertheless, large errors in both the phase and amplitude of the diurnal cycle in precipitation remain even at the highest resolution considered here. These errors tend to be associated with unrealistically strong coupling of the convection to the surface heating and suggest that improved simulations of the diurnal cycle of precipitation require further improvements in the parameterizations of moist convection processes.
URI
Go to Link
DOI
10.1175/JCL14090.1
ISSN
0894-8755
Appears in Collections:
UEE_Journal Papers
Files in This Item:
2-s2.0-34249657458.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU