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基于遥感和实测数据对台风LEO和SOULIK期间的飞沫热通量研究
艾德强, 林都, 李海艳
中国科学院大学 北京 100049
摘要:
本文应用高风速条件下海面动力粗糙度长度,拓展了COARE3.0块体通量算法,考虑高风速下,海洋飞沫对热通量的贡献。利用GSSTF3(Goddard Satellite-based Surface Turbulent Fluxes Version 3)遥感产品、GSSTF_NCEP(National Centers Environmental Prediction)再分析资料和浮标KEO实测数据,探讨了中国南海台风LEO和西北太平洋台风SOULIK期间湍流热通量的变化。研究结果表明:感热通量与潜热通量相比很小;台风的轨迹与潜热通量的分布密切相关且在台风轨迹的东偏北区域潜热通量数值大;在热带低压之前,原潜热通量与改进后潜热通量的差值即飞沫热通量很小,随着台风等级的增加,飞沫热通量也增加。当台风LEO达到最高即台风级别时原潜热通量达到300W/m2,飞沫热通量与原通量的比值高达12%,而台风SOULIK达到强台风级别时原潜热通量达到1000W/m2,飞沫热通量与原通量的比值达到20%,显著高于台风LEO,飞沫效应更明显。
关键词:  海面动力粗糙度长度  海洋飞沫  COARE 3.0  热通量  台风
DOI:10.11693/hyhz20170800216
分类号:P731
基金项目:中国科学院海洋战略先导科技专项项目,XDA11010104号。
STUDY ON SEA SPRAY HEAT FLUX DURING TYPHOON LEO AND SOULIK BASED ON REMOTE SENSING AND MEASURED DATA
AI De-Qiang, LIN Du, LI Hai-Yan
University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
We improved the bulk flux algorithm COARE 3.0 by considering the influence of droplets in the high-speed wind with the improved aerodynamic roughness length at sea surface. The change of turbulent heat fluxes during typhoon LEO in the South China Sea and the typhoon SOULIK in Northwest Pacific based on GSSTF3 (Goddard Satellite-based Surface Turbulent Fluxes Version 3) remote sensing products and GSSTF_NCEP (National Centers Environmental Prediction) reanalysis data were estimated and compared with the original and improved algorithms. The results show that the sensible heat flux is small than that of the latent heat flux. The typhoon trajectory is closely related to the distribution of latent heat flux and the large-value area is on the northeast side of the track line. The difference between the original latent heat flux and the improved flux (sea spray heat flux) is very small during the period of the tropical depression. As the typhoon level increases, the gap of the two fluxes grows to the highest of 300W/m2 at the highest level of typhoon LEO, the ratio of the improved flux to the original flux reached about 12%. The typhoon SOULIK peaks at 1000W/m2, the ratio reaches 20%, which is significantly greater than that of typhoon LEO whose spray effect is more obvious.
Key words:  sea surface aerodynamic roughness length  ocean droplet  COARE 3.0  heat flux  typhoon
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