Characteristics of low-frequency oscillation intensity of air-sea turbulent heat fluxes over the northwest Pacific
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- 作者：Gen Li (1)
BaoHua Ren (1)
JianQiu Zheng (1)
Jun Wang (1) - 关键词：northwest Pacific ; latent heat flux ; sensible heat flux ; low ; frequency oscillation
- 刊名：Science China Earth Sciences
- 出版年：2009
- 出版时间：August 2009
- 年：2009
- 卷：52
- 期：8
- 页码：1137-1151
- 全文大小：1812KB
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BaoHua Ren (1)
JianQiu Zheng (1)
Jun Wang (1)
1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China - ISSN：1869-1897
文摘
Based on the daily turbulent heat fluxes and related meteorological variables datasets (1985-006) from Objectively Analyzed air-sea Fluxes (OAFlux) Project of Woods Hole Oceanographic Institution (WHOI), characteristics of low-frequency oscillation intensity of air-sea turbulent heat fluxes over the northwest Pacific are analyzed by linear perturbation method and correlation analysis. It can be concluded that: 1) the distribution of low-frequency oscillation intensity of latent heat flux (LHF) over the northwest Pacific is mainly affected by that of low-frequency oscillation intensity of anomalous air-sea humidity gradient (Δq- as well as mean air-sea humidity gradient ( $ \overline {\Delta q} $ ), while the distribution of low-frequency oscillation intensity of sensible heat flux (SHF) is mainly affected by that of low-frequency oscillation intensity of anomalous air-sea temperature gradient (ΔT-. 2) The low-frequency oscillation of turbulent heat fluxes over the northwest Pacific is the strongest in winter and the weakest in summer. And the seasonal transition of low-frequency oscillation intensity of LHF is jointly influenced by those of low-frequency oscillation intensity of Δq- low-frequency oscillation intensity of anomalous wind speed (U-, $ \overline {\Delta q} $ and mean wind speed (ū), while the seasonal transition of low-frequency oscillation intensity of SHF is mainly influenced by those of low-frequency oscillation intensity of ΔT-and ū. 3) Over the tropical west Pacific and sea areas north of 20°N, the low-frequency oscillation of LHF (SHF) is mainly influenced by atmospheric variables q a -(T a - and U- indicating an oceanic response to overlying atmospheric forcing. In contrast, over the tropical eastern and central Pacific south of 20°N, q s -(T s - also greatly influences the low-frequency oscillation of LHF (SHF).