气候变化领域集成服务门户(CCPortal): Mean State Biases and Interannual Variability Affect Perceived Sensitivities of the Madden-Julian Oscillation to Air-Sea Coupling

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DOI	10.1029/2019MS001799
	Mean State Biases and Interannual Variability Affect Perceived Sensitivities of the Madden-Julian Oscillation to Air-Sea Coupling
	Klingaman N.P.; Demott C.A.
发表日期	2020
ISSN	19422466
卷号	12 期号:2
英文摘要	Atmosphere-ocean feedbacks often improve the Madden-Julian oscillation (MJO) in climate models, but these improvements are balanced by mean state biases that can degrade the MJO through changing the basic state on which the MJO operates. The Super-Parameterized Community Atmospheric Model (SPCAM3) produces perhaps the best representation of the MJO among contemporary models, which improves further in a coupled configuration (SPCCSM3) despite considerable mean state biases in tropical sea surface temperatures and rainfall. We implement an atmosphere-ocean-mixed-layer configuration of SPCAM3 (SPCAM3-KPP) and use a flux-correction technique to isolate the effects of coupling and mean state biases on the MJO. When constrained to the observed ocean mean state, air-sea coupling does not substantially alter the MJO in SPCAM3, in contrast to previous studies. When constrained to the SPCCSM ocean mean state, SPCAM3-KPP fails to produce an MJO, in stark contrast to the strong MJO in SPCCSM3. Further KPP simulations demonstrate that the MJO in SPCCSM3 arises from an overly strong sensitivity to El Niño–Southern Oscillation events. Our results show that simulated interannual variability and coupled-model mean state biases affect the perceived response of the MJO to coupling. This is particularly concerning in the context of internal variability in coupled models, as many previous MJO sensitivity studies in coupled models used relatively short (20- to 50-year) simulations that undersample interannual-decadal variability. Diagnosing the effects of coupling on the MJO requires simulations that carefully control for mean state biases and interannual variability. ©2020. The Authors.
英文关键词	air-sea coupling; El Nino-Southern Oscillation; Madden-Julian oscillation; sub-seasonal variability; super-parameterization; tropical convection
语种	英语
scopus关键词	Atmospheric pressure; Atmospheric thermodynamics; Climate models; Oceanography; Surface waters; Air-sea coupling; El Nino southern oscillation; Madden-Julian oscillation; Seasonal variability; Tropical convection; Climatology; annual variation; atmosphere-ocean coupling; atmospheric modeling; climate modeling; decadal variation; El Nino-Southern Oscillation; Madden-Julian oscillation; mixed layer; oceanic convection; sea surface temperature; seasonal variation; sensitivity analysis
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156763
作者单位	National Centre for Atmospheric Science and Department of Meteorology, University of Reading, Reading, United Kingdom; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Klingaman N.P.,Demott C.A.. Mean State Biases and Interannual Variability Affect Perceived Sensitivities of the Madden-Julian Oscillation to Air-Sea Coupling[J],2020,12(2).
APA	Klingaman N.P.,&Demott C.A..(2020).Mean State Biases and Interannual Variability Affect Perceived Sensitivities of the Madden-Julian Oscillation to Air-Sea Coupling.Journal of Advances in Modeling Earth Systems,12(2).
MLA	Klingaman N.P.,et al."Mean State Biases and Interannual Variability Affect Perceived Sensitivities of the Madden-Julian Oscillation to Air-Sea Coupling".Journal of Advances in Modeling Earth Systems 12.2(2020).