The planetary boundary layer (PBL) structure and corresponding stratocumulus (Sc) clouds under different prevailing wind directions over the East China Sea were studied using CloudSat and sounding observations from March–April 2007–2017. The dominant factors affecting the PBL structure and atmospheric response mechanism associated with the Kuroshio sea surface temperature front (SSTF) differed under the three prevailing wind directions. When northeasterly (NE) wind prevails, the opposite spatially high‐pass‐filtered meteorological parameters between the warm tongue and cold pool indicate that the PBL structure is predominantly determined by the SSTF via the sea level pressure adjustment mechanism. However, when northwesterly (NW) and southeasterly (SE) winds prevail, a downward kinetic energy tongue extends from the free atmosphere to the sea surface, indicating that the dynamic PBL structure is predominantly controlled by atmospheric circulation. The (minor) difference in relative humidity between the cold and warm sides indicates that the thermodynamic PBL structure is dominated by the SSTF through the vertical mixing mechanism (by atmospheric circulation) under NW (SE) prevailing wind. Completely different PBL structures lead to different temperature inversion (TI) and Sc cloud characteristics under the three prevailing wind directions. TI mainly occurs as low tropospheric inversion over the warm tongue, while the frequency of near‐surface inversion is large over the cold pool under NE and SE prevailing wind directions. The Sc cloud fraction over the warm tongue is two times larger than that over the cold pool under NE prevailing wind and is the largest (smallest) when NW (SE) wind prevails.

中文翻译：

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东海黑潮海面温度锋面不同风向下春季行星边界层结构及相应的云特征

使用CloudSat和2007年3月至4月的测深观测研究了东海不同盛行风向下的行星边界层（PBL）结构和相应的平积云（Sc）。在三个主要风向下，影响PBL结构和与黑潮海面温度锋（SSTF）相关的大气响应机制的主导因素有所不同。当盛行东北风时，暖舌和冷池之间的空间高通滤波气象参数相反，表明PBL结构主要由SSTF通过海平面压力调节机制确定。但是，当西北风（NW）和东南风（SE）盛行时，向下的动能舌从自由大气延伸到海面，表明动态PBL结构主要受大气环流控制。冷侧和热侧之间的相对湿度的（较小）差异表明，在NW（SE）盛行风的作用下，热力学PBL结构由SSTF通过垂直混合机制（通过大气循环）控制。在三个主要风向下，完全不同的PBL结构会导致不同的温度反转（TI）和Sc云特征。TI主要表现为暖舌上的低对流层反转，而东北和东南风为主的冷池上近地表反转的频率较大。