A comparison of two heavy rainfall events during the terrain-influenced monsoon rainfall experiment (TiMREX) 2008

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Title:	A comparison of two heavy rainfall events during the terrain-influenced monsoon rainfall experiment (TiMREX) 2008
Authors:	林沛練;Tu, Chuan-Chi;Chen, Yi-Leng;Chen, Ching-Sen;Lin, Pay-Liam;Lin, Po-Hsiung
Contributors:	地球科學學院大氣科學學系
Keywords:	Coastal environments;Coasts;Cold;Convective systems;Doppler radar;Evaporative cooling;Flow;Heavy precipitation;Heavy rainfall;Hoisting;Lifting;Lightning;Marine;Maximum daily rainfall;Moisture effects;Monsoon rainfall;Mountains;Numerical simulations;Offshore;Precipitation;Rain;Rain cells;Rainfall;Rainy season;Sea breezes;Seasons;Studies;Summer;Terrain;Time series;Tropical environments;Wet season;Wind
Date:	2014-01-01
Issue Date:	2026-04-21 13:48:08 (UTC+8)
Publisher:	American Meteorological Society;Washington: American Meteorological Society
Abstract:	摘要： AbstractTwo contrasting localized heavy rainfall events during Taiwan’s early summer rainy season with the daily rainfall maximum along the windward mountain range and coast were studied and compared using a combination of observations and numerical simulations. Both events occurred under favorable large-scale settings including the existence of a moisture tongue from the tropics. For the 31 May case, heavy rainfall occurred in the afternoon hours over the southwestern windward slopes after a shallow surface front passed central Taiwan. The orographic lifting of the prevailing warm, moist, west-southwesterly flow aloft, combined with a sea breeze–upslope flow at the surface provided the localized lifting needed for the development of heavy precipitation. On 16 June before sunrise, pronounced orographic blocking of the warm, moist, south-southwesterly flow occurred because of the presence of relatively cold air at low levels as a result of nocturnal and rain evaporative cooling. As a result, convective systems intensified as they moved toward the southwestern coast. During the daytime, the cold pool remained over southwestern Taiwan without the development of onshore/upslope flow. Furthermore, with a south-southwesterly flow aloft parallel to terrain contours, orographic lifting aloft was absent and preexisting rain cells offshore diminished after they moved inland. Over northern Taiwan on the lee side, a sea breeze/onshore flow developed in the afternoon hours, resulting in heavy thundershowers. These results demonstrate the importance of diurnal and local effects on determining the location and timing of the occurrences of localized heavy precipitation during the early summer rainy season over Taiwan. 出版者： Washington: American Meteorological Society 出版日期： 2014-07-01 出處： Monthly Weather Review, 2014-07, Vol.142 (7), p.2436-2463 資源來源： EBSCOhost OmniFile Full Text Select 版權： Copyright American Meteorological Society Jul 2014 版權： Copyright American Meteorological Society 2014 識別號： ISSN: 0027-0644 識別號： EISSN: 1520-0493 識別號： DOI: 10.1175/mwr-d-13-00293.1 識別號： CODEN: MWREAB
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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