DOI: 10.1002/2017JD026558
论文题名: Thermodynamic and dynamic influences in the Far East-Okhotsk region on stagnant Meiyu-Baiu
作者: Wu C.-H.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 14 起始页码: 7276
结束页码: 7288
语种: 英语
英文关键词: Meiyu-Baiu
; Okhotsk high
; westerly jet stream
; western North Pacific subtropical high
英文摘要: Westerly perturbation is enlarged over the Far East-Okhotsk region in late June and early July and is associated with the largest land-sea heating contrast surrounding the Sea of Okhotsk. The corresponding characteristics in the lower troposphere are southward deepening of the cold low over northeastern China, and intensification of the Okhotsk high. Coincidentally, the Meiyu-Baiu coupled with the western North Pacific (WNP) subtropical high is nearly stagnant during this period. By simulations using a global climate model with an intensified Okhotsk surface high in response to cooling Sea of Okhotsk, it is suggested that the enhanced thermal contrast over the Far East-Okhotsk region can generate an obstacle to Meiyu-Baiu poleward migration. Corresponding to the intensified Okhotsk high, the WNP subtropical high is strengthened by the high ridge over Taiwan. The East Asian midlatitude westerly jet stream in the northern flank of the WNP subtropical high also strengthens; the consequently enhanced midtropospheric warm temperature advection can regulate the latitude position of the Meiyu-Baiu. The wave source generated in the upper troposphere is located over the midlatitude WNP (anomalous cyclone) bordering the Sea of Okhotsk, whereas that in the lower troposphere is related to the strengthened westerly in the northern WNP subtropical high. The wave activity propagation consistently indicates the strengthening and equatorward confinement of the westerly jet. Therefore, the intensified Okhotsk high and enlarged westerly perturbation beginning in late June are suggested as an inherently geographic limit of the Far East-Okhotsk region in regard to Meiyu-Baiu migration. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: MOST 105-2119-M-001-018
; MOST 105-2119-M-001-021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62640
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Wu C.-H.. Thermodynamic and dynamic influences in the Far East-Okhotsk region on stagnant Meiyu-Baiu[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(14)