DOI: 10.1007/s00382-017-3627-8
Scopus记录号: 2-s2.0-85016956929
论文题名: Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model
作者: Zhu J. ; Kumar A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-01-02 起始页码: 571
结束页码: 586
语种: 英语
Scopus关键词: atmosphere-ocean coupling
; climate feedback
; climate modeling
; climate prediction
; climatology
; computer simulation
; El Nino-Southern Oscillation
; heat budget
; mixed layer
; ocean basin
; sea surface temperature
; temperature anomaly
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: Studies have suggested that surface nudging could be an efficient way to reconstruct the subsurface ocean variability, and thus a useful method for initializing climate predictions (e.g., seasonal and decadal predictions). Surface nudging is also the basis for climate models with flux adjustments. In this study, however, some negative aspects of surface nudging on climate simulations in a coupled model are identified. Specifically, a low-resolution version of the NCEP Climate Forecast System, version 2 (CFSv2L) is used to examine the influence of nudging on simulations of climatological mean and on the coupled feedbacks during ENSO. The effect on ENSO feedbacks is diagnosed following a heat budget analysis of mixed layer temperature anomalies. Diagnostics of the climatological mean state indicates that, even though SST biases in all ocean basins, as expected, are eliminated, the fidelity of climatological precipitation, surface winds and subsurface temperature (or the thermocline depth) could be highly ocean basin dependent. This is exemplified by improvements in the climatology of these variables in the tropical Atlantic, but degradations in the tropical Pacific. Furthermore, surface nudging also distorts the dynamical feedbacks during ENSO. For example, while the thermocline feedback played a critical role during the evolution of ENSO in a free simulation, it only played a minor role in the nudged simulation. These results imply that, even though the simulation of surface temperature could be improved in a climate model with surface nudging, the physics behind might be unrealistic. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109508
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Climate Prediction Center, NOAA/NWS/NCEP, 5830 University Research Court, College Park, MD 20740, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
Recommended Citation:
Zhu J.,Kumar A.. Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model[J]. Climate Dynamics,2018-01-01,50(2018-01-02)