DOI: 10.1175/JCLI-D-14-00053.1
Scopus记录号: 2-s2.0-84905898830
论文题名: Process-oriented diagnosis of East Pacific warm pool intraseasonal variability
作者: Maloney E.D. ; Jiang X. ; Xie S.-P. ; Benedict J.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 16 起始页码: 6305
结束页码: 6324
语种: 英语
Scopus关键词: Budget control
; Rain
; Atmospheric general circulation
; Complex empirical orthogonal functions
; Intraseasonal variability
; Precipitation events
; Precipitation variability
; Propagation pattern
; Tropical rainfall measuring missions
; Vertical component
; Lakes
; amplitude
; atmospheric general circulation model
; efficiency measurement
; empirical analysis
; moisture transfer
; observational method
; precipitation intensity
; relative humidity
; seasonal variation
; TRMM
; warm pool
; wind shear
; zonal wind
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: June-October east Pacific warm pool intraseasonal variability (ISV) is assessed in eight atmospheric general circulation simulations. Complex empirical orthogonal function analysis is used to document the leading mode of 30-90-day precipitation variability in the models and Tropical Rainfall Measuring Mission observations. The models exhibit a large spread in amplitude of the leading mode about the observed amplitude. Little relationship is demonstrated between the amplitude of the leading mode and the ability of models to simulate observed north-northeastward propagation. Several process-oriented diagnostics are explored that attempt to distinguish why some models produce superior ISV. A diagnostic based on the difference in 500-850-hPa averaged relative humidity between the top 5% and the bottom 10% of precipitation events exhibits a significant correlation with leading mode amplitude. Diagnostics based on the vertically integrated moist entropy budget also demonstrate success at discriminating models with strong and weak variability. In particular, the vertical component of gross moist stability exhibits a correlation with amplitude of 20.9, suggesting that models in which convection and associated divergent circulations are less efficient at discharging moisture from the column are better able to sustain strong ISV. Several other diagnostics are tested that show no significant relationship with leading mode amplitude, including the warm pool mean surface zonal wind, the strength of surface flux feedbacks, and 500-850-hPa averaged relative humidity for the top1%of rainfall events. Vertical zonal wind shear and 850-hPa zonal wind do not appear to be good predictors of model success at simulating the observed northward propagation pattern. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
; NSF, National Science Foundation
; NSF, National Science Foundation
; NOAA, National Science Foundation
; NASA, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51121
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, CA, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Maloney E.D.,Jiang X.,Xie S.-P.,et al. Process-oriented diagnosis of East Pacific warm pool intraseasonal variability[J]. Journal of Climate,2014-01-01,27(16)