DOI: 10.1002/jgrd.50288
论文题名: The representation of the TTL in a tropical channel version of the WRF model
作者: Evan S. ; Rosenlof K.H. ; Dudhia J. ; Hassler B. ; Davis S.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2835
结束页码: 2848
语种: 英语
Scopus关键词: Atmospheric radiation
; Clouds
; Computer simulation
; Experiments
; Meteorological instruments
; Tropics
; Water vapor
; Horizontal grid spacing
; Initial and boundary conditions
; Ozonesonde measurements
; Temperature simulations
; Tropical tropopause layers
; Water vapor distribution
; Water vapor measurement
; Weather research forecasts
; Weather forecasting
; cirrus
; climate modeling
; data set
; marine atmosphere
; ozone
; radiative forcing
; tropical environment
; tropopause
; warming
; water vapor
; weather forecasting
; Pacific Ocean
英文摘要: In this study, the Weather Research Forecast (WRF) model is used to investigate key physical processes controlling the Tropical Tropopause Layer (TTL) temperature and water vapor distributions in December 2005 to January-February 2006. The model domain is configured as a tropical channel with a horizontal grid spacing of 36 km, a vertical grid spacing of 500 m, and a top at 0.1 hPa. Initial and boundary conditions are set using the ERA-Interim reanalysis data set. An ozone distribution computed from satellite and ozonesonde measurements is used for radiative forcing calculations. The model's ability to replicate observed TTL temperatures is evaluated via comparisons with radiosonde data and reanalyses (MERRA and ERA-Interim). The Microwave Limb Sounder (MLS) water vapor measurements are used to evaluate WRF-simulated water vapor in the TTL. Results of the simulations show that the model reproduces the mean temperature and its variability above 50 hPa as well as the tropical tropopause height. However, the model cold point tropopause temperature is colder than the reanalyses by ∼1.2 K. The model captures the location of TTL water vapor minimum in the Western Pacific but is drier than the MLS observations in the TTL. To assess possible reasons for the tropopause temperature discrepancy, an additional WRF experiment was conducted using analysis nudging for water vapor. This experiment produces more tropical cirrus clouds in the upper troposphere and a warming of ∼1.5 K of the cold point tropopause. This suggests that the radiative effects of cirrus clouds and water vapor must be considered for accurate temperature simulations in the TTL. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63834
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: NOAA/ESRL, Chemical Sciences Division, 325 Broadway - R/CSD8, Boulder, CO 80305-3328, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Evan S.,Rosenlof K.H.,Dudhia J.,et al. The representation of the TTL in a tropical channel version of the WRF model[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)