Anomalously large latent heat fluxes in low to moderate wind conditions within the eddy-rich zone of the Northwestern Pacific
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Title
- Anomalously large latent heat fluxes in low to moderate wind conditions within the eddy-rich zone of the Northwestern Pacific
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Author(s)
- Kang, Sok Kuh; Kim, Eun Jin; Kim, Sung Hun; Cione, Joseph; Lee, Dongkyu; Landwehr, Sebastian; Kang, Hyoun Woo; Kim, Kyeong Ok; Hong, Chang Su; Kwon, Min Ho; Oh, Kyung Hee; Lee, Jae Hak; Noh, Suyun; So, Jae Kwi; Kang, Dong Jin; Kim, Dong Seon; Park, Jae-Hyoung; Nam, SungHyun; Cho, Yang Ki; Ward, Brian; Ginis, Isaac
- KIOST Author(s)
- Kim, Eun Jin(김은진); Kim, Sunghun(김성훈); Kang, Hyoun Woo(강현우); Kim, Kyeong Ok(김경옥); Kwon, Min Ho(권민호); Oh, Kyung Hee(오경희); Noh, Suyun(노수연); Kang, Dong Jin(강동진); Kim, Dong Seon(김동선)
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Alternative Author(s)
- 강석구; 김은진; 김성훈; 강현우; 김경옥; 홍창수; 권민호; 오경희; 이재학; 노수연; 소재귀; 강동진; 김동선
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Publication Year
- 2024-02
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Abstract
- An air-sea interaction field campaign was conducted in September of 2017 within the warm and cold eddy region of the western Northwest Pacific (WNP) (17.5˚-20.5˚N, 127.5˚E-133.5˚E). Both near-surface oceanic and atmospheric conditions in addition to ocean heat content (OHC) were examined to better understand the mechanisms governing high heat flux magnitudes responsible for rapidly intensifying tropical cyclones. Observations from this experiment indicate that the latent heat flux (LHF) under modest wind conditions reached 400 W m-2 within the vicinity of a warm eddy, with OHC higher than 100 kJ cm-2 of warm eddy region being 2~3 times as large as that of cold eddy region. These high OHC and a resultant high LHF in the warm eddy, comparable to the magnitude of LHF in the North Equatorial Current, may explain the mechanism of why tropical cyclones over a warm eddy in eddy-rich zones often rapidly intensify in the WNP. A month later typhoon Lan rapidly intensified into a super typhoon, while passing over the boundary region of warm and cold eddies during the observation period. Results from this study illustrate that both the wind-normalized LHF and the difference (Qs-Qa) between the specific humidity at air (Qa) and at the sea surface (Qs), closely correlate with OHC patterns, which suggests that the ocean looks likely to control the spatial pattern of LHF. Overall, both the ocean and weather conditions govern the pattern of specific humidity difference between the air-sea interface, with large OHC over the warm eddy controlling higher Qs and the pattern of Qa depending on the pattern of wind direction. Qa as a factor impacting LHF magnitude is strongly linked to wind direction in the experimental area, that is, the drier northwesterly flow and southeasterly moist wind, resulting in the enhanced contrast of specific humidity at cold eddy region.
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ISSN
- 2296-7745
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/45381
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DOI
- 10.3389/fmars.2024.1298641
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Bibliographic Citation
- Frontiers in Marine Science, v.11, 2024
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Publisher
- Frontiers Media S.A.
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Keywords
- ocean heat content; specific humidity; tropical cyclone-ocean interaction; latent heat flux; eddy-rich zone
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Type
- Article
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Language
- English
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