Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure
Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure
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DOI：
10.1029/2005gl025102
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发表时间：
2006-02
影响因子：
5.2
通讯作者：
H. Tokinaga;Y. Tanimoto;M. Nonaka;B. Taguchi;T. Fukamachi;S. Xie;H. Nakamura;Tomowo Watanabe;I. Yasuda
中科院分区：
文献类型：
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作者：
H. Tokinaga;Y. Tanimoto;M. Nonaka;B. Taguchi;T. Fukamachi;S. Xie;H. Nakamura;Tomowo Watanabe;I. Yasuda
2003 - 04年冬季，在日本东部进行了船上无线电探空仪调查，以研究黑潮延伸区的大气边界层（ABL）结构。大气边界层的垂直结构变化很大，其中大部分是由于大气表面稳定度的变化。当通过海-气温差测量的地面大气不稳定（中性）时，地面湍流热通量增加（减少），混合层发展（未发展），垂直风切变减弱（加强）。线性回归分析表明，当海-气温差增加7°C或地面湍流热通量增加500 Wm−2时，ABL高度往往增加1 km。虽然在43天的调查中，天气扰动引起的纬向热平流似乎引起了大部分大气稳定性变率，但垂直混合和风切变对稳定性的强烈敏感性与卫星在月和更长时间尺度上观测到的SST和地面风的同相协变一致。
Shipboard radiosonde surveys were conducted during the 2003‐04 winter east of Japan to study atmospheric boundary layer (ABL) structure over the Kuroshio Extension. ABL displayed large variations in vertical structure, most of which are attributable to changes in atmospheric surface stability. Where the surface atmosphere was unstable (neutral) as measured by the sea‐air temperature difference, surface turbulent heat flux increased (decreased) and a mixed‐layer developed (undeveloped) with weakened (intensified) vertical wind shear. A linear regression analysis indicates that ABL height tends to increase by 1km as the sea‐air temperature difference increases by 7°C or surface turbulent heat flux by 500 Wm−2. While meridional thermal advection by weather disturbances seems to cause much of atmospheric stability variability during the 43‐day surveys, the strong sensitivity of vertical mixing and wind shear to stability is consistent with the observed in‐phase co‐variability of SST and surface wind from satellite on monthly and longer timescales.