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, Yuntao1,2,3; Ren, Hong-Li1,2; Mu, Mu4,5; Fu, Joshua-Xiouhua4,5
2019-11-30
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Pages25
Corresponding AuthorRen, Hong-Li(renhl@cma.gov.cn) ; Mu, Mu(mumu@fudan.edu.cn)
AbstractAlthough 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.
KeywordPrimary MJO event CNOP Nonlinear moisture advection Nonlinear optimal excitation
DOI10.1007/s00382-019-05021-7
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000499553500002
PublisherSPRINGER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/163850
Collection海洋环流与波动重点实验室
Corresponding AuthorRen, Hong-Li; Mu, Mu
Affiliation1.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
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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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