| 海气通量涡相关法计算中的时间尺度分析 |
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| 引用本文： | 黄艳松,宋金宝,范聪慧.海气通量涡相关法计算中的时间尺度分析[J].海洋科学,2011,35(11):114-119. |
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| 作者姓名： | 黄艳松 宋金宝 范聪慧 |
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| 作者单位： | 中国科学院 海洋研究所 环流与波动重点实验室；中国科学院 研究生院;中国科学院 海洋研究所 环流与波动重点实验室;中国科学院 海洋研究所 环流与波动重点实验室 |
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| 基金项目： | 国家重点基础研究发展计划(2011CB403501); 国家自然科学基金(40876012); 国家基金委创新群体项目(40821004) |
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| 摘 要： | 基于黄海上连续14 d 的浮标观测资料, 采用多尺度分解法确定了海气通量涡相关法计算中的截断时间尺度, 并分析了该截断时间尺度的特征及其对感热通量计算的影响。研究结果是： 由多尺度分解法获得的湍通量截断时间尺度可将总通量中湍通量和中尺度通量分离开来, 截断时间尺度随着湍流强度或水平风速的增加而增加, 且感热通量的截断时...
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| 关 键 词： | 平均时间尺度 海气通量 谱隙 多尺度分解法 截断时间尺度 |
| 收稿时间： | 2010/12/6 0:00:00 |
| 修稿时间： | 2011/9/29 0:00:00 |
On the average time scale used in the calculations of the air-sea fluxes by eddy covariance method |
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| Abstract: | Based on data collected at a moored buoy located in the Yellow Sea for a period of 14 days, the cutoff time scale (CTS), a parameter in the calculations of the air-sea fluxes by the eddy covariance method was determined by the multiresolution decomposition method, and could be used in separating turbulent fluxes and mesoscale fluxes from the total air-sea fluxes. The CTS increased with the crease of turbulence intensity or wind velocity.The CTS of the sensible heat flux was always longer than that of the momentum flux. When the turbulence intensity was less than 0.3 m/s, most of CTS of the momentum and sensible heat fluxes were around 100 s and the difference between the turbulent and total fluxes was large; when the turbulence intensity is larger than 0.3 m/s, most of CTSs were around 800 s and the turbulent fluxwas similar to that of total fluxes. The calculation and analysis of the average and uncertainty of sensible heat flux indicated the CTS has more influence on the average value than on the uncertainty of the flux and such a difference became smaller as the turbulence intensity increases. The choice of CTS is important to get the air-sea fluxes, providing a scientific basis for further understanding the interaction between the ocean and atmosphere. |
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| Keywords: | average time scale air-sea fluxes spectral gap multiresolution decomposition cutoff time scale |
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