DOI: 10.1007/s00382-011-1204-0
Scopus记录号: 2-s2.0-84867101140
论文题名: IOD influence on the early winter tibetan plateau snow cover: Diagnostic analyses and an AGCM simulation
作者: Yuan C. ; Tozuka T. ; Yamagata T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-07-08 起始页码: 1643
结束页码: 1660
语种: 英语
英文关键词: AGCM simulation
; Baroclinic mode
; Barotropic mode
; Indian Ocean Dipole
; Ray tracing
; Teleconnection
; Wave-activity flux
; Winter Tibetan Plateau snow cover
英文摘要: Using diagnostic analyses and an AGCM simulation, the detailed mechanism of Indian Ocean Dipole (IOD) influence on the early winter Tibetan Plateau snow cover (EWTPSC) is clarified. In early winter of pure positive IOD years with no co-occurrence of El Niño, the anomalous dipole diabatic heating over the tropical Indian Ocean excites the baroclinic response in the tropics. Since both baroclinic and barotropic components of the basic zonal wind over the Arabian Peninsula increase dramatically in early winter due to the equatorward retreat of the westerly jet, the baroclinic mode excites the barotropic Rossby wave that propagates northeastward and induces a barotropic cyclonic anomaly north of India. This enables the moisture transport cyclonically from the northern Indian Ocean toward the Tibetan Plateau. The convergence of moisture over the plateau explains the positive influence of IOD on the EWTPSC. In contrast, the basic zonal wind over the Arabian Peninsula is weak in autumn. This is not favorable for excitation of the barotropic Rossby wave and teleconnection, even though the IOD-related diabatic heating anomaly in autumn similar to that in early winter exists. This result explains the insignificant (significant positive) partial correlation between IOD and the autumn (early winter) Tibetan Plateau snow cover after excluding the influence of ENSO. The sensitivity experiment forced by the IOD-related SST anomaly within the tropical Indian Ocean well reproduces the baroclinic response in the tropics, the teleconnection from the Arabian Peninsula, and the increased moisture supply to the Tibetan Plateau. Also, the seasonality of the atmospheric response to the IOD is simulated. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55144
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Recommended Citation:
Yuan C.,Tozuka T.,Yamagata T.. IOD influence on the early winter tibetan plateau snow cover: Diagnostic analyses and an AGCM simulation[J]. Climate Dynamics,2012-01-01,39(2017-07-08)