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首页> 外文期刊>Journal of Physical Oceanography >Mixed Layer Depth and Sea Surface Warming under Diurnally Cycling Surface Heat Flux in the Heating Season
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Mixed Layer Depth and Sea Surface Warming under Diurnally Cycling Surface Heat Flux in the Heating Season

机译：混合层深度和海面在加热季节循环表面热通量下变暖

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摘要

In the present study, large-eddy simulations (LESs) were performed to investigate mixed layer depth (MLD) and sea surface warming (SSW) under diurnally cycling surface heat flux in the heating season, in which a mixed layer (ML) is shoaling on intraseasonal time scales. The LES results showed that the diurnal cycle makes the MLD greater (smaller) at lower (higher) latitudes than the MLD without the cycle. Time scales of the wind-induced shear and the surface heat are a key to understand this latitudinal dependence of the diurnal cycle effects. The wind-induced shear-driven turbulence developed from early morning and became strongest at half the inertial period (T-i/2), while nighttime cooling weakened the ML stratification until the end of the nighttime (T-24 = 24 h). At lower latitudes where T-i/2 T-24 (lower than 15 degrees), the shear-driven turbulence continued to grow after T-24 and determined the time of the greatest MLD. Thus, the shear-driven turbulence shaped the latitudinal dependence of the MLD, though convective turbulence helped further deepening of the ML. At higher latitudes (T-i/2 T-24), on the other hand, the shear-driven turbulence ceased growing before the nighttime cooling ended. However, reduced stratification due to the nighttime cooling supported the shear-driven turbulence to continue deepening the ML. Thus, the nighttime cooling shaped the latitudinal dependence of the MLD at higher latitudes. The MLD change induced by the diurnal cycle altered the SSW rate. At higher latitudes, the diurnal cycle is expected to reduce the MLD and increase the SSW by 10% in the heating season.
机译：在本研究中，在加热季节中，进行大涡模拟（较少）以研究混合层深度（MLD）和海面变暖（SSW），其中混合层（ML）是浅层的关于初始时间尺度。 LES结果表明，昼夜循环使得MLD更大（更小）在没有循环的情况下比MLD更低（更高）。风引起的剪切的时间尺度和表面热是理解昼夜周期效应的潜在依赖性的关键。从清晨开发的风诱导的剪切驱动湍流，在惯性时期（T-I / 2）的一半处变得最强，而夜间冷却削弱了ML分层直至夜间结束（T-24 = 24h）。在T-I / 2> T-24（低于15度）的较低纬度下，剪切驱动的湍流继续在T-24之后生长并确定最大的MLD的时间。因此，剪切驱动的湍流形状为MLD的纬度依赖性，但是对流湍流有助于进一步加深ML。另一方面，在更高的纬度（T-I / 2

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