A Study of Variations of Oceanic Parameters before and after Typhoon Pass By-1

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Project title

Code/計畫編號

NSC98-2611-M019-017-MY3

Translated Name/計畫中文名

西北太平洋及其邊緣海之颱風---海洋交互作用與內波之研究---子計畫---颱風前後海洋環境參數變化之研究-1

Project Coordinator/計畫主持人

Yao-Tsai Lo

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

何宗儒

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=1889554

Year

2009

Start date/計畫起

01-08-2009

Expected Completion/計畫迄

01-07-2010

Co-Investigator(s)

Chung-Ru Ho

Bugetid/研究經費

1775千元

ResearchField/研究領域

海洋科學
大氣科學

"颱風的形成與強度的變化與海洋上層結構息息相關，而颱風通過後也會影響海洋的上層結構變化。從衛星資料可發現，在相似的颱風路徑與強度下，海洋對颱風的響應卻不一樣。颱風引起的冷尾跡(Cold wake)是海洋對颱風響應的現象之一，然而，大多數的颱風引起的冷尾跡並非一直伴隨在其路徑之後，有些海域容易發現冷尾跡，有些則不易見到。這些現象是否是因為颱風前的海洋上層結構的不同而造成的，值得深入研究。此外艾克曼抽吸(Ekman pumping)或慣性運動(Initial motion)對冷尾跡現象的貢獻為何，也是研究重點。因此，本三年計畫擬以多衛星遙測資料、ARGO 浮球資料、TOGA 錨碇浮球資料及總計畫所設置的錨碇浮球資料，分析颱風前後上層海洋環境參數的變化，以進一步瞭解海洋與颱風之相互作用機制。第一年的重點為蒐集西北太平洋的颱風資料、衛星量測的海洋環境參數包括海面溫度、海面高度、海面風場等，及各式浮球資料，以瞭解海洋環境的變化對颱風生成位置與強度的關係。第二年則將進一步探討海洋環境對颱風強度變化的影響。第三年為針對颱風引起不同的海洋現象，深入探討預先存在的海洋條件，對颱風引起上層海洋響應的影響。本研究所得結果將與其他子計畫的結果相互驗證。" "The relationship between the intensity of typhoon and the upper ocean structure is very close. Typhoons may cause the upper ocean cooling because of the mixing as well as the entrainment from the bottom of mixed layer. However, from satellite images, one may find that cold wakes do not always accompany the paths of typhoons even the typhoons have similar paths and intensities. Some areas may find the cooling phenomenon but some areas don’t. This perhaps relates with the pre-existing upper ocean structure, Ekman pumping intensity, or initial motion. To be clear about this phenomenon and to understand the mechanism, the oceanic environment data derived from multi-satellites, buoy data, typhoon data will be used. In this three-year proposal, the first year, we will focus on the understanding of the relationship between the generation position and intensity of typhoon and the variation of oceanic environment. The oceanic environment data includes the remotely-sensed measurements of sea surface temperature, sea surface height and sea surface winds, as well as the buoy data of Argo, TOGA and the one deployed by this project. The second year, we will deeply analyze the influence of oceanic environments on the change of typhoon intensity. The third-year work will be focused on the pre-existing oceanic conditions to upper ocean response induced by typhoons. The result will make us more understand the interaction between air and sea. All results from this study will compare with the in-situ measurements and model results which are obtained from other sub-proposals."

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A Study of Variations of Oceanic Parameters before and after Typhoon Pass By-1

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