Nonlinear optimal moisture perturbations as excitation of primary MJO events in a hybrid coupled climate model

doi:10.1007/s00382-019-05021-7

IOCAS-IR > 海洋环流与波动重点实验室

	Nonlinear optimal moisture perturbations as excitation of primary MJO events in a hybrid coupled climate model
	Wei, Yuntao 1,2,3; Ren, Hong-Li 1,2; Mu, Mu 4,5; Fu, Joshua-Xiouhua 4,5
	2019-11-30
发表期刊	CLIMATE DYNAMICS
ISSN	0930-7575
页码	25
通讯作者	Ren, Hong-Li([email protected]) ; Mu, Mu([email protected])
摘要	Although the moisture feedback has been well known to be essential in the Madden-Julian Oscillation (MJO) dynamics, whether its pre-moistening effect plays a key role in exciting the onset of primary MJO events, as has been confirmed in the successive initiation, remains elusive. In this study, using a hybrid coupled climate model that has a good fidelity in simulating the intraseasonal variability, we develop a new framework of methodology to investigate the nonlinear excitation of primary MJO event, of which the key achievement is the successful implementation of the conditional nonlinear optimal perturbation (CNOP). In an application of this new framework, the CNOP-type moisture perturbations are calculated for the pre-chosen non-MJO reference states and generally favor a moistening in the equatorial region while drying in the poleward. Comparisons of the model simulation with observation give credibility to the existence of moisture signals several weeks before some primary MJO events. A suite of numerical experiments confirms that the CNOPs of moisture can contribute to the excitation and propagation of strong primary MJO events while random perturbations cannot. The moisture budget analysis further reveals the central importance of the horizontal moisture advection, especially the nonlinearly upscaled moisture transports associated with the high-frequency disturbances on the quasi-3-4-day and 6-8-day synoptic time scales, in supporting the nonlinear excitation of the primary MJO events. The subgrid-scale processes of evaporation, condensation and eddy transport of moisture are found to be critical for the pre-moistening effect in the boundary layer as well. This study directly supports the vital importance of the moisture perturbations, which are characterized by a particular pattern concentrated at low levels, to the nonlinear growth and propagation of the primary MJO events.
关键词	Primary MJO event CNOP Nonlinear moisture advection Nonlinear optimal excitation
DOI	10.1007/s00382-019-05021-7
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program on Monitoring, Early Warning and Prevention of Major Natural Disaster[2018YFC1506004]###3281; National Basic Research (973) Program of China[2015CB453203]###2574; China National Science Foundation[41775066]###2575; China National Science Foundation[41375062]###2576; National Key Research and Development Program on Monitoring, Early Warning and Prevention of Major Natural Disaster[2018YFC1506004]; National Basic Research (973) Program of China[2015CB453203]; China National Science Foundation[41775066]; China National Science Foundation[41375062]
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000499553500002
出版者	SPRINGER
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/163850
专题	海洋环流与波动重点实验室
通讯作者	Ren, Hong-Li; Mu, Mu
作者单位	1.China Meteorol Adm, Lab Climate Studies, Natl Climate Ctr, Beijing 100081, Peoples R China 2.China Meteorol Adm, CMA NJU Joint Lab Climate Predict Studies, Natl Climate Ctr, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Shandong, Peoples R China 4.Fudan Univ, Inst Atmospher Sci, Shanghai 200438, Peoples R China 5.Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai 200438, Peoples R China
推荐引用方式 GB/T 7714	Wei, Yuntao,Ren, Hong-Li,Mu, Mu,et al. Nonlinear optimal moisture perturbations as excitation of primary MJO events in a hybrid coupled climate model[J]. CLIMATE DYNAMICS,2019:25.
APA	Wei, Yuntao,Ren, Hong-Li,Mu, Mu,&Fu, Joshua-Xiouhua.(2019).Nonlinear optimal moisture perturbations as excitation of primary MJO events in a hybrid coupled climate model.CLIMATE DYNAMICS,25.
MLA	Wei, Yuntao,et al."Nonlinear optimal moisture perturbations as excitation of primary MJO events in a hybrid coupled climate model".CLIMATE DYNAMICS (2019):25.

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