DOI: 10.1002/2014MS000423
Scopus记录号: 2-s2.0-84944930772
论文题名: Consequences of systematic model drift in DYNAMO MJO hindcasts with SP-CAM and CAM5
作者: Hannah W ; M ; , Maloney E ; D ; , Pritchard M ; S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 3 起始页码: 1051
结束页码: 1074
语种: 英语
英文关键词: Advection
; Budget control
; DC generators
; Interactive devices
; Moisture
; Moisture meters
; CAM5
; Hindcasts
; MJO
; Moisture budget
; Moisture distribution
; Superparameterization
; Synoptic-eddy activity
; Systematic modeling
; Cams
; advection
; climate modeling
; eddy
; field survey
; hindcasting
; meridional circulation
; moisture flux
; parameterization
; precipitation (climatology)
; wind field
英文摘要: Hindcast simulations of MJO events during the dynamics of the MJO (DYNAMO) field campaign are conducted with two models, one with conventional parameterization (CAM5) and a comparable model that utilizes superparameterization (SP-CAM). SP-CAM is shown to produce a qualitatively better reproduction of the fluctuations of precipitation and low-level zonal wind associated with the first two DYNAMO MJO events compared to CAM5. Interestingly, skill metrics using the real-time multivariate MJO index (RMM) suggest the opposite conclusion that CAM5 has more skill than SP-CAM. This inconsistency can be explained by a systematic increase of RMM amplitude with lead time, which results from a drift of the large-scale wind field in SP-CAM that projects strongly onto the RMM index. CAM5 hindcasts exhibit a contraction of the moisture distribution, in which extreme wet and dry conditions become less frequent with lead time. SP-CAM hindcasts better reproduce the observed moisture distribution, but also have stronger drift patterns of moisture budget terms, such as an increase in drying by meridional advection in SP-CAM. This advection tendency in SP-CAM appears to be associated with enhanced off-equatorial synoptic eddy activity with lead time. Systematic drift moisture tendencies in SP-CAM are of similar magnitude to intraseasonal moisture tendencies, and therefore are important for understanding MJO prediction skill. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75982
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 Atmospheric Science, University of Miami, Miami, FL, United States; Now at Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Department of Earth System Science, University of California Irvine, Irvine, CA, United States
Recommended Citation:
Hannah W,M,, Maloney E,et al. Consequences of systematic model drift in DYNAMO MJO hindcasts with SP-CAM and CAM5[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)