DOI: 10.1002/2016MS000689
Scopus记录号: 2-s2.0-84981306463
论文题名: Effects of explicit convection on global land-atmosphere coupling in the superparameterized CAM
作者: Sun J ; , Pritchard M ; S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 3 起始页码: 1248
结束页码: 1269
语种: 英语
英文关键词: Boundary layer flow
; Boundary layers
; Cams
; Climate models
; Moisture
; Precipitation (meteorology)
; Soil moisture
; Cloud resolving model
; Community atmosphere model
; Coupling indices
; Land-atmosphere couplings
; Lifting condensation levels
; Planetary boundary layers
; Superparameterization
; Surface turbulent fluxes
; Atmospheric thermodynamics
; atmosphere-biosphere interaction
; atmospheric convection
; atmospheric modeling
; boundary layer
; climate feedback
; climate modeling
; cloud
; condensation
; coupling
; global climate
; parameterization
; precipitation (climatology)
; rainfall
; regional pattern
; soil moisture
; tropical environment
; turbulent flow
; Great Plains
; India
; Mexico [North America]
; United States
英文摘要: Conventional global climate models are prone to producing unrealistic land-atmosphere coupling signals. Cumulus and convection parameterizations are natural culprits but the effect of bypassing them with explicitly resolved convection on global land-atmosphere coupling dynamics has not been explored systematically. We apply a suite of modern land-atmosphere coupling diagnostics to isolate the effect of cloud Superparameterization in the Community Atmosphere Model (SPCAM) v3.5, focusing on both the terrestrial segment (i.e., soil moisture and surface turbulent fluxes interaction) and atmospheric segment (i.e., surface turbulent fluxes and precipitation interaction) in the water pathway of the land-atmosphere feedback loop. At daily timescales, SPCAM produces stronger uncoupled terrestrial signals (negative sign) over tropical rainforests in wet seasons, reduces the terrestrial coupling strength in the Central Great Plain in American, and reverses the coupling sign (from negative to positive) over India in the boreal summer season—all favorable improvements relative to reanalysis-forced land modeling. Analysis of the triggering feedback strength (TFS) and amplification feedback strength (AFS) shows that SPCAM favorably reproduces the observed geographic patterns of these indices over North America, with the probability of afternoon precipitation enhanced by high evaporative fraction along the eastern United States and Mexico, while conventional CAM does not capture this signal. We introduce a new diagnostic called the Planetary Boundary Layer (PBL) Feedback Strength (PFS), which reveals that SPCAM exhibits a tight connection between the responses of the lifting condensation level, the PBL height, and the rainfall triggering to surface turbulent fluxes; a triggering disconnect is found in CAM. © 2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75883
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth System Science, University of California, Irvine, CA, United States
Recommended Citation:
Sun J,, Pritchard M,S. Effects of explicit convection on global land-atmosphere coupling in the superparameterized CAM[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(3)