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105/12/06 14:00 中央大學大氣科學系余嘉裕教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2016-12-01演 講 公 告
主講人：余嘉裕 教授
地點：中央大學科學一館S-325教室
摘要：
講題：Impacts of Vertical Structure of Convection on Tropical Climate
主講人：余嘉裕 教授
中央大學大氣科學系
時間：12月06日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
Interactions between cumulus convection and its large-scale environment have been recognized as crucial to the understanding of tropical climate and its variability. In this study, the moist static energy (MSE) budget is employed to investigate the potential impact of the vertical structure of large-scale vertical motion in tropical climate based on results from both reanalysis data and model simulation. Two domains are selected over the western and eastern Pacific with vertical motion profiles that are dominated by top-heavy and bottom-heavy structures, respectively. The bottom-heavy structure is climatologically associated with more shallow convection, while the top-heavy structure is related to more deep convection. The column-integrated vertical MSE advection of top-heavy vertical motion is positive, while that of bottom-heavy vertical motion tends to be negative. Controlling factors responsible for the above vertical MSE advection contrast are discussed based on a simple decomposition of the MSE budget equation. It was found that the sign of vertical MSE advection is determined mainly by the vertical moisture transport, the magnitude of which is very sensitive to the structure of vertical motion. A top-heavy (bottom heavy) structure of vertical motion favors an export (import) of MSE and a positive (negative) value of the vertical MSE advection. Implications to the IPCC CMIP5 global warming projections are also discussed.
最後修改時間：2016-12-01 PM 1:36
