https://scholars.lib.ntu.edu.tw/handle/123456789/606311
標題: | Idealized cloud-resolving simulations of land-atmosphere coupling over tropical islands | 作者: | Wu C.-M CHIEN-MING WU |
關鍵字: | Cloud resolving model;Diurnal cycle precipitation;Land atmospheric coupling;Tropical islands;atmospheric modeling;atmospheric moisture;convective system;diurnal variation;land-atmosphere interaction;precipitation (climatology) | 公開日期: | 2021 | 卷: | 32 | 期: | 2 | 起(迄)頁: | 191-202 | 來源出版物: | Terrestrial, Atmospheric and Oceanic Sciences | 摘要: | This study investigates the impact of land-atmosphere coupling (LAC) over tropical islands using a Vector-Vorticity equation cloud-resolving Model (VVM). Two sets of idealized simulations are performed with three land surface conditions (Urban, Pasture, and Grass). The first set considers direct LAC in which VVM is fully coupled with LSM. The second set of experiments eliminates direct LAC by prescribing surface fluxes in VVM, in which the high spatiotemporal variabilities are preserved from the fully coupled VVM/LSM. We can interpret the difference in convective systems’ temporal and spatial evolution between the two sets of experiments as the LAC’s impact. The results show that direct LAC enhances the diurnal amplitude and extreme precipitation under all land surface conditions. The impact of direct LAC is profound on the diurnal amplitude in the Urban experiment in which the sensible heat fluxes dominate. It produces 71% more precipitation with direct LAC than without. The result is due to the strong cold pool intensity by convective systems with large updraft core clouds in the Urban experiment. The mismatch between surface cooling and the convection in the experiments without direct LAC, on the other hand, prohibits further development of convection. In the Grass experiment, in which the latent heat fluxes dominate, the cold pool effects become less critical and have weaker impacts on convection development. Sensitivity experiments on free atmosphere moisture show that the dependency still holds except that the precipitation intensity is higher in a moister environment. ? 2021 Chinese Geoscience Union. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112627274&doi=10.3319%2fTAO.2020.12.16.01&partnerID=40&md5=48b644db389cda8c57bd1cca9fb90167 https://scholars.lib.ntu.edu.tw/handle/123456789/606311 |
ISSN: | 10170839 | DOI: | 10.3319/TAO.2020.12.16.01 |
顯示於: | 大氣科學系 |
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