Atmospheric Response to Mesoscale Oceanic Eddies over the Kuroshio Extension:Case Analyses of Warm and Cold Eddies in Winter
Atmospheric Response to Mesoscale Oceanic Eddies over the Kuroshio Extension:Case Analyses of Warm and Cold Eddies in Winter
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发表时间：
2014
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通讯作者：
M. Jin
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作者：
M. Jin
利用动态合成和带通滤波方法研究了冬季黑潮延伸区一个暖涡和一个冷涡对中尺度海洋涡旋的响应。结果表明，在动态合成上，海表面温度(SST)与10m风速呈正相关，表明在日时间尺度上存在显著的海洋强迫。在具有正(负)涡度异常的暖(冷)涡中心出现显著的弱辐散。潜热通量和感热通量比暖(冷)涡增加(减少)，代表湍流粘性力的摩擦速度的最大(最小)中心位于暖(冷)涡之上，表明垂直混合机制在中、小尺度海气相互作用中起着重要作用。中尺度海洋涡能对大气瞬变扰动强度产生影响，这种影响在边界层和中低对流层都是显著的。此外，斜压能量转换在大气瞬变扰动的海洋强迫中起着关键作用。
The response of the atmosphere to mesoscale oceanic eddies is investigated by using dynamic composite and bandpass filters with particular focus on one warm eddy and one cold eddy over the Kuroshio Extension during the winter season.Results show positive correlation between sea surface temperature(SST) and wind speed at 10-m on dynamic composites,indicating remarkable oceanic forcing at daily time scales.Significantly weak divergence appears over the warm(cold) eddy center with positive(negative) vorticity anomaly.Latent and sensible heat fluxes increase(decrease)over the warm(cold) eddy,thus weakening(enhancing) atmospheric stability and thickening(thinning) the marine atmospheric boundary layer with strong(weak) vertical mixing.The maximum(minimum) center of frictional velocity,which represents turbulent viscous forces,lies over the warm(cold) eddy,indicating the substantial role of the vertical mixing mechanism in mesoscale and microscale ocean-atmosphere interaction.Mesoscale oceanic eddies can exert their influence on atmospheric transient disturbance intensity,which is significant both in the boundary layer and the mid-lower troposphere.Moreover,baroclinic energy conversion is found to play a critical role in the oceanic forcing of atmospheric transient disturbances.