Analyzing the Influence of the Sea Surface Height Anomaly and Heat Content of Ocean Mixed Layer on Typhoon Intensity with Satellite Data (II)

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Project title

Code/計畫編號

NSC102-2625-M019-003

Translated Name/計畫中文名

衛星資料在災害性降雨預報上的整合研究-子計畫:衛星遙測海面高度變異量及海水混合層熱含量在颱風強度變化的分析(II)

Project Coordinator/計畫主持人

Shih-Jen Huang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=3113366

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

31-07-2014

Bugetid/研究經費

568千元

ResearchField/研究領域

大氣科學
太空科技

"臺灣位於太平洋西側的中緯度地區，每年夏、秋季都會受到颱風的侵襲，而春季和冬季往往會受到鋒面所帶來大量的降雨而造成災害。由於颱風和鋒面所含的大量水汽，主要是提供自海洋。又由於全球暖化關係，強烈颱風的強度和發生頻率呈增大趨勢，也影響降雨量的分布。海洋因水的蒸發或凝結而與大氣產生能量交換，當颱風在增強時期遭遇暖渦時，暖渦提供較多的能量給颱風發展；當颱風在增強時期遭遇冷渦時，冷渦會抑制颱風強度的發展。當颱風在增強時期經過暖渦且熱含量指標越高時，颱風強度增強的幅度越大。當颱風在減弱時期遭遇暖渦時，暖渦會減緩颱風消散的速度。當颱風在減弱時期經過冷渦且熱含量指標越低時，颱風強度減弱的幅度越大。暖渦為表層海水輻合的現象，冷渦則為表層海水輻散的情形，而熱含量指標是由海水表層溫度和上層海水混合成厚度的推算。所以本研究擬以多重衛星的海面溫度資料、衛星高度、風場等衛星及現場觀測資料來估算上層海水的熱含量情形，進而探討這熱含量與颱風強度和鋒面的降雨量的闗係。""Taiwan is located at the middle-latitude western Pacific. In summer and fall, it is usually impacted by typhoons. In spring and winter, the fronts always sweep through the island. Typhoons and fronts not only kill many people but also damage lots of properties seriously. The global warming should result in increasing the intensity of tropical cyclones. The precipitation rate of the area within the storm center increases also. Generally, the energy and water content in typhoons and fronts come from water vapor, which is mostly evaporated from ocean. During the stage of typhoon developed, the warm eddy and the greater heat content index could offer more energy and make typhoons become stronger; the cold eddy and the less heat content index could suppress typhoon development. During the stage of typhoon decayed, the warm eddy and the greater heat content index could delay the time of decaying. The warm and cold eddies depict the ocean convergence and divergence respectively. Otherwise, the heat content index can be defined with sea surface temperature and mixed layer depth. Therefore, in this study, the multi-satellite data including altimetry, sea surface temperature, wind filed, and in-situ observation data will be used to estimate the heat content and the mixed layer depth. Therefore, we will investigate the correlation between some ocean characteristics (e.g. the heat content, ocean convergence and divergence) and the intensity of typhoon and the precipitation intensity of fronts."

Keyword(s)

高度計
海面水溫
熱含量
颱風
altimetry
sea surface temperature
heat storage
typhoon

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Analyzing the Influence of the Sea Surface Height Anomaly and Heat Content of Ocean Mixed Layer on Typhoon Intensity with Satellite Data (II)

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