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利用中国“海洋一号(HY-1B)”卫星海洋水色水温扫描仪(COCTS)和美国Terra卫星中分辨率成像光谱仪(MODIS)等观测数据对2011年3月2日济州岛东南海域的冯·卡门(von Krmn)大气涡街现象进行了观测和动力分析。COCTS和MODIS观测得到大气涡街涡列距离和涡旋间距比(h/a)均值分别为0.32和0.35;在大气涡街发生海域存在低风速海面风涡旋和海面温度暖舌;济州岛的大气垂直结构存在一逆温层。利用COCTS和MODIS伪彩色合成图观测时间差异,计算得到涡旋移动速率为12.2m/s,而分别利用它们各自的几何观测参数(h/a),结合涡街动力模型计算得到涡旋移动速率分别为12.8m/s和12.3m/s。利用上述观测结果计算得到大气涡街个例的脱落频率为1.24×10-4 s-1,脱落周期为134min,其中雷诺数范围为60～75,涡街运动学黏性系数范围为2 200～2 750,弗劳德数为0.10,罗斯比数为0.43。分析结果表明中国“海洋一号”卫星数据可用于冯·卡门大气涡街等海洋大气现象的定量化研究。
Based on the observed data of China’s “HY-1B” satellite ocean color water temperature scanner (COCTS) and the United States Terra satellite medium resolution imaging spectrometer (MODIS), on March 2, 2011, in the southeastern sea area of Jeju Island Von Kärmän atmospheric vortex phenomenon was observed and dynamical analysis. The mean eddy vortex and vortex spacing ratios (h / a) of COVS and MODIS were 0.32 and 0.35, respectively. There was low wind speed vortex and sea surface warm tongue in the area where atmospheric vortex occurred; Atmospheric vertical structure of a temperature inversion layer. Using the COCTS and MODIS pseudo-color composite maps to observe the time difference, the vortex moving velocity was calculated to be 12.2 m / s, and the vortex movement rate was calculated using their respective geometrical observation parameters (h / a) Respectively 12.8 m / s and 12.3 m / s. The shedding frequency of atmospheric vortex shedding was calculated as 1.24 × 10-4 s-1 and the shedding period was 134 min. The Reynolds number range was 60-75 and the kinematic viscosity coefficient of vortex shedding ranged from 2 200 ~ 2 750, Froude number 0.10, and Rose number 0.43. The analysis results show that the data of China “Ocean One ” satellite can be used for the quantitative study of ocean atmospheric phenomena such as von Karman atmospheric vortex shedding.