DOI: 10.1175/JCLI-D-15-0705.1
Scopus记录号: 2-s2.0-84977566455
论文题名: Summer U.S. surface air temperature variability: Controlling factors and AMIP simulation biases
作者: Merrifield A.L. ; Xie S.-P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 14 起始页码: 5123
结束页码: 5139
语种: 英语
Scopus关键词: Beams and girders
; Climatology
; Evapotranspiration
; Heat flux
; Multivariant analysis
; Oceanography
; Orthogonal functions
; Regression analysis
; Surface measurement
; Surface properties
; Surface waters
; Atmosphere-land interactions
; Geographic location
; Interannual variability
; North America
; Summer/warm season
; Surface temperatures
; Variability
; Atmospheric temperature
; air temperature
; atmospheric circulation
; climate change
; climate modeling
; heat flux
; radiative forcing
; summer
; surface temperature
; United States
英文摘要: This study documents and investigates biases in simulating summer surface air temperature (SAT) variability over the continental United States in the Atmospheric Model Intercomparison Project (AMIP) experiment from phase 5 of the Coupled Model Intercomparison Project (CMIP5). Empirical orthogonal function (EOF) and multivariate regression analyses are used to assess the relative importance of circulation and the land surface feedback at setting summer SAT over a 30-yr period (1979-2008). Regions of high SAT variability are closely associated with midtropospheric highs, subsidence, and radiative heating accompanying clear-sky conditions. The land surface exerts a spatially variable influence on SAT through the sensible heat flux and is a second-order effect in the high-variability centers of action (COAs) in observational estimates. The majority of the AMIP models feature high SAT variability over the central United States, displaced south and/or west of observed COAs. SAT COAs in models tend to be concomitant and strongly coupled with regions of high sensible heat flux variability, suggesting that excessive land-atmosphere interaction in these models modulates U.S. summer SAT. In the central United States, models with climatological warm biases also feature less evapotranspiration than ERA-Interim but reasonably reproduce observed SAT variability in the region. Models that overestimate SAT variability tend to reproduce ERA-Interim SAT and evapotranspiration climatology. In light of potential model biases, this analysis calls for careful evaluation of the land-atmosphere interaction hot spot region identified in the central United States. Additionally, tropical sea surface temperatures play a role in forcing the leading EOF mode for summer SAT in models. This relationship is not apparent in observations. © 2016 American Meteorological Society. 资助项目: NOAA, National Oceanic and Atmospheric Administration
; NSF, 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/50238
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
Recommended Citation:
Merrifield A.L.,Xie S.-P.. Summer U.S. surface air temperature variability: Controlling factors and AMIP simulation biases[J]. Journal of Climate,2016-01-01,29(14)