DOI: 10.1175/JCLI-D-13-00530.1
Scopus记录号: 2-s2.0-84907056132
论文题名: South Asian summer monsoon and the eastern Mediterranean climate: The monsoon-desert mechanism in CMIP5 simulations
作者: Cherchi A. ; Annamalai H. ; Masina S. ; Navarra A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 18 起始页码: 6877
结束页码: 6903
语种: 英语
Scopus关键词: Asian summer monsoons
; Eastern Mediterranean
; atmospheric modeling
; desert
; diabatic process
; energy budget
; heating
; Mediterranean environment
; monsoon
; rainfall
; summer
; teleconnection
; Arabian Sea
; Bay of Bengal
; Indian Ocean
; South Asia
英文摘要: Dry summers over the eastern Mediterranean are characterized by strong descent anchored by long Rossby waves, which are forced by diabatic heating associated with summer monsoon rainfall over South Asia. The large-scale teleconnection between rising and subsiding air masses is referred to as the ''monsoon-desert mechanism.'' This study evaluates the ability of the phase 5 of the Coupled Model Intercomparison Project (CMIP5) models in representing the physical processes involved in this mechanism. An evaluation of statistics between summer climatologies of monsoon diabatic heating and that of vertical velocity over the eastern Mediterranean suggests a linear relationship. Despite large spatial diversity in monsoon heating, descent over the Mediterranean is coherently located and realistic in intensity. To measure the sensitivity of descent to the diversity in the horizontal and vertical distribution of monsoon heating, a series of linear atmosphere model experiments are performed. It is shown that column-integrated heating over both the Bay of Bengal and the Arabian Sea provides the largest descent with a more realistic spatial pattern. In the vertical, CMIP5 models underestimate the diabatic heating at upper levels, while they overestimate it at lower levels, resulting in a weaker forced response and weaker associated descent over the Mediterranean. A moist static energy budget analysis applied to CMIP5 suggests that most models capture the dominant role of horizontal temperature advection and radiative fluxes in balancing descent over the Mediterranean. Based on the objective analysis herein, a subset of models is identified that captures the teleconnection for reasons consistent with observations. The recognized processes vary at interannual time scales as well, with imprints of severe weak/strong monsoons noticeable over the Mediterranean. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51272
Appears in Collections: 气候变化事实与影响
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作者单位: Centro Euro-Mediterraneo sui Cambiamenti Climatici, Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy; International Pacific Research Center, University of Hawai'i at Manoa, Honolulu, HI, United States
Recommended Citation:
Cherchi A.,Annamalai H.,Masina S.,et al. South Asian summer monsoon and the eastern Mediterranean climate: The monsoon-desert mechanism in CMIP5 simulations[J]. Journal of Climate,2014-01-01,27(18)