DOI: 10.1175/JCLI-D-13-00760.1
Scopus记录号: 2-s2.0-84903388712
论文题名: Intraseasonal variability in coupled GCMs: The roles of ocean feedbacks and model physics
作者: DeMott C.A. ; Stan C. ; Randall D.A. ; Branson M.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 4970
结束页码: 4995
语种: 英语
Scopus关键词: Budget control
; Climate change
; Computer simulation
; Fluxes
; Heat convection
; Heat flux
; Moisture
; Surface measurement
; Atmosphere-ocean interactions
; Community atmospheric model
; Coupled models
; General circulation model
; Intraseasonal oscillations
; Intraseasonal variability
; Madden-Julian oscillation
; Sea surface temperatures
; Oceanography
; air-sea interaction
; atmosphere-ocean coupling
; atmospheric modeling
; general circulation model
; heat flux
; Madden-Julian oscillation
; sea surface temperature
; seasonal variation
; Indian Ocean
英文摘要: The interaction of ocean coupling and model physics in the simulation of the intraseasonal oscillation (ISO) is explored with three general circulation models: the Community Atmospheric Model, versions 3 and 4 (CAM3 and CAM4), and the superparameterized CAM3 (SPCAM3). Each is integrated coupled to an ocean model, and as an atmosphere-only model using sea surface temperatures (SSTs) from the coupled SPCAM3, which simulates a realistic ISO. For each model, the ISO is best simulated with coupling. For each SST boundary condition, the ISO is best simulated in SPCAM3. Near-surface vertical gradients of specific humidity, Dq (temperature, DT), explain;20% (50%) of tropical Indian Ocean latent (sensible) heat flux variance, and somewhat less of west Pacific variance. In turn, local SST anomalies explain ;5% (25%) of Dq (DT) variance in coupled simulations, and less in uncoupled simulations. Ergo, latent and sensible heat fluxes are strongly controlled by wind speed fluctuations, which are largest in the coupled simulations, and represent a remote response to coupling. The moisture budget reveals that wind variability in coupled simulations increases east-of-convection midtropospheric moistening via horizontal moisture advection, which influences the direction and duration of ISO propagation. These results motivate a new conceptual model for the role of ocean feedbacks on the ISO. Indian Ocean surface fluxes help developing convection attain a magnitude capable of inducing the circulation anomalies necessary for downstream moistening and propagation. The ''processing'' of surface fluxes by model physics strongly influences the moistening details, leading to model-dependent responses to coupling. © 2014 American Meteorological Society. 资助项目: 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/51150
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; Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean-Land-Atmosphere Studies, Fairfax, VA, United States
Recommended Citation:
DeMott C.A.,Stan C.,Randall D.A.,et al. Intraseasonal variability in coupled GCMs: The roles of ocean feedbacks and model physics[J]. Journal of Climate,2014-01-01,27(13)