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Understanding the Australian Monsoon change during the Last Glacial Maximum with a multi-model ensemble
Yan, Mi1,2; Wang, Bin3,4; Liu, Jian1,2; Zhu, Axing1,2,5,6; Ning, Liang1,2,7; Cao, Jian4
2018-12-20
Source PublicationCLIMATE OF THE PAST
ISSN1814-9324
Volume14Issue:12Pages:2037-2052
Corresponding AuthorLiu, Jian(jliu@njnu.edu.cn) ; Cao, Jian(jianc@nuist.edu.cn)
AbstractThe response of the Australian monsoon to external forcings and related mechanisms during the Last Glacial Maximum (LGM) are investigated by multi-model experiments in CMIP5-PMIP3. Although the annual mean precipitation over the Australian monsoon region decreases, the annual range, or the monsoonality, is enhanced. The precipitation increases in early austral summer and decreases in austral winter, resulting in the amplified annual range, but the main contribution comes from the decreased precipitation in austral winter. The decreased winter precipitation is primarily caused by weakened upward motion, although reduced water vapor also has a moderate contribution. The weakened upward motion is induced by the enhanced land-sea thermal contrast, which intensifies the divergence over northern Australia. The increased Australian monsoon rainfall in early summer, however, is an integrated result of the positive effect of local dynamic processes (enhanced moisture convergence) and the negative effect of thermodynamics (reduced moisture content). The enhanced moisture convergence is caused by two factors: the strengthened northwest-southeast thermal contrast between the cooler Indochina-western Indonesia and the warmer northeastern Australia, and the east-west sea surface temperature gradients between the warmer west-ern Pacific and cooler eastern Indian Ocean, both due to the alteration of land-sea configuration arising from the sea level drop. The enhanced Australian monsoonality in the LGM is not associated with global-scale circulation change such as the shift of the Intertropical Convergence Zone; rather, it is mainly due to the change of regional circulations around Australia arising from the changes in land-sea contrast and the east-west SST gradients over the Indian and western Pacific oceans. This finding should be taken into account when investigating its future change under global warming. Our findings may also explain why proxy records indicate different changes in Australian monsoon precipitation during the LGM.
DOI10.5194/cp-14-2037-2018
WOS KeywordGLOBAL MONSOON ; SUMMER MONSOON ; CLIMATE VARIABILITY ; HYDROLOGICAL CYCLE ; HEAT-TRANSPORT ; ITCZ LOCATION ; INDO-PACIFIC ; SEA-LEVEL ; PRECIPITATION ; CIRCULATION
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFA0600401] ; National Basic Research Program[2015CB953804] ; National Natural Science Foundation of China[41671197] ; National Natural Science Foundation of China[41420104002] ; National Natural Science Foundation of China[41501210] ; Priority Academic Development Program of Jiangsu Higher Education Institutions (PAPD)[164320H116]
Funding OrganizationNational Key Research and Development Program of China ; National Basic Research Program ; National Natural Science Foundation of China ; Priority Academic Development Program of Jiangsu Higher Education Institutions (PAPD)
WOS Research AreaGeology ; Meteorology & Atmospheric Sciences
WOS SubjectGeosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS IDWOS:000454054500001
PublisherCOPERNICUS GESELLSCHAFT MBH
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/51326
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiu, Jian; Cao, Jian
Affiliation1.Nanjing Normal Univ, State Key Lab Geog Environm Evolut, Key Lab Virtual Geog Environm,Minist Educ, Jiangsu Prov Cultivat Base,Sch Geog Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing 210023, Jiangsu, Peoples R China
3.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96825 USA
4.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing 210044, Jiangsu, Peoples R China
5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China
6.Univ Wisconsin, Dept Geog, Madison, WI 53706 USA
7.Univ Massachusetts, Dept Geosci, Climate Syst Res Ctr, Amherst, MA 01003 USA
Recommended Citation
GB/T 7714
Yan, Mi,Wang, Bin,Liu, Jian,et al. Understanding the Australian Monsoon change during the Last Glacial Maximum with a multi-model ensemble[J]. CLIMATE OF THE PAST,2018,14(12):2037-2052.
APA Yan, Mi,Wang, Bin,Liu, Jian,Zhu, Axing,Ning, Liang,&Cao, Jian.(2018).Understanding the Australian Monsoon change during the Last Glacial Maximum with a multi-model ensemble.CLIMATE OF THE PAST,14(12),2037-2052.
MLA Yan, Mi,et al."Understanding the Australian Monsoon change during the Last Glacial Maximum with a multi-model ensemble".CLIMATE OF THE PAST 14.12(2018):2037-2052.
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