Seasonal variations in atmospheric responses to oceanic eddies in the Kuroshio Extension
Seasonal variations in atmospheric responses to oceanic eddies in the Kuroshio Extension
复制标题
黑潮延伸段大气对海洋涡流响应的季节变化
DOI：
10.3402/tellusa.v68.31563
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发表时间：
2016-06
影响因子：
2
通讯作者：
Dong, Changming
中科院分区：
文献类型：
--
作者：
Ma, Jing;Xu, Haiming;Dong, Changming
利用高分辨率卫星观测的分析揭示了黑潮延伸区（KE）海洋涡旋的大气响应的明显季节变化，其特征是冷季（冬季和春季）的表面风速和热通量响应比暖季（夏季和秋季）强得多。云液态水和降水率也表现出季节性特征，在冷（暖）海洋涡旋上，冬季的亏损（盈余）多于夏季。CFSR（Climate Forecast System Reanalysis）资料能较好地再现KE区地面大气对涡旋的季节响应，但与卫星观测结果相比，地面风速的响应要弱得多，潜热通量的响应要强得多。此外，CFSR资料还揭示了对流层响应的显著季节变化，冬季涡动引起的风速（垂直速度）异常可达900 hPa（800 hPa），而夏季仅出现在近海面。本文应用天气研究与预报模式（WRF）研究了大气对理想海洋涡旋响应的季节变化。该模式成功地模拟了在两个季节的风速，热通量，海洋大气边界层（MABL）的高度和垂直速度的理想化的暖涡的大气响应的季节变化。CFSR资料和模式模拟结果均表明，大气对海洋涡旋响应的季节变化可以归因于不同季节背景大气稳定度的变化。
Analyses using high-resolution satellite observations reveal distinct seasonal variations in atmospheric responses to oceanic eddies in the Kuroshio Extension (KE) region, characterised by much stronger surface wind speed and heat flux responses in the cold seasons (winter and spring) than in the warm seasons (summer and autumn). Cloud liquid water and rain rate also display seasonally dependent characteristics, with more deficit (surplus) in winter than in summer over the cold (warm) oceanic eddies. CFSR (Climate Forecast System Reanalysis) data can well reproduce these seasonal variations in surface atmospheric responses to the eddies in the KE region, albeit with much weaker responses in surface wind speed and with stronger responses in latent heat flux in comparison with the results based on satellite observations. In addition, the CFSR data also reveal remarkable seasonal variations in tropospheric responses, with eddy-induced wind speed (vertical velocity) anomalies reaching as high as 900 hPa (800 hPa) in winter, while they only occur near the sea surface in summer. The Weather Research and Forecast (WRF) model is applied to study the seasonal variations in atmospheric responses to idealised oceanic eddies. The model successfully simulates the seasonal variations in atmospheric responses to an idealised warm eddy in terms of wind speed, heat flux, marine atmospheric boundary layer (MABL) height and vertical velocity in both seasons. Both the CFSR data and the model simulations indicate that the seasonal variations in atmospheric responses to oceanic eddies can be attributed to the variations in background atmospheric stability during different seasons.
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影响因子：
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作者：
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通讯作者：
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