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首页> 外文期刊>Atmospheric chemistry and physics >Aerosol characteristics in the entrainment interface layer in relation to the marine boundary layer and free troposphere
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Aerosol characteristics in the entrainment interface layer in relation to the marine boundary layer and free troposphere

机译：夹带界面层的气溶胶特性与海洋边界层有关和自由对流层

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This study uses airborne data from two field campaigns off the California coast to characterize aerosol size distribution characteristics in the entrainment interface layer (EIL), a thin and turbulent layer above marine stratocumulus cloud tops, which separates the stratocumulus-topped boundary layer (STBL) from the free troposphere (FT). The vertical bounds of the EIL are defined in this work based on considerations of buoyancy and turbulence using thermodynamic and dynamic data. Aerosol number concentrations are examined from three different probes with varying particle diameter (Dp) ranges: >?3?nm, >?10?nm, and 0.11–3.4?μm. Relative to the EIL and FT layers, the sub-cloud (SUB) layer exhibited lower aerosol number concentrations and higher surface area concentrations. High particle number concentrations between 3 and 10?nm in the EIL are indicative of enhanced nucleation, assisted by high actinic fluxes, cool and moist air, and much lower surface area concentrations than the STBL. Slopes of number concentration versus altitude in the EIL were correlated with the particle number concentration difference between the SUB and lower FT layers. The EIL aerosol size distribution was influenced by varying degrees from STBL aerosol versus subsiding FT aerosol depending on the case examined. These results emphasize the important role of the EIL in influencing nucleation and aerosol–cloud–climate interactions.
机译：本研究使用来自加州海岸的两个场运动中的空气传播数据，以表征夹带界面层（EIL）中的气溶胶尺寸分布特性，在海洋划线层上方的薄而湍流层，其分离划分的划分的边界层（STBL）从自由的对流层（FT）。基于使用热力学和动态数据的浮力和湍流的考虑，在这项工作中定义了EIL的垂直边界。从具有不同粒径（DP）范围的三种不同探针检查气溶胶数浓度：>α3≤nm，>？10·nm，0.11-3.4μm。相对于EIL和FT层，亚云（子）层表现出较低的气溶胶数浓度和更高的表面积浓度。 EIL中3至10℃之间的高粒子数浓度指示增强成核，通过高光谱助熔剂，冷却和潮湿的空气辅助，以及比STBL更低的表面积浓度。数量浓度与EIL中的高度的斜率与亚和下FT层之间的粒子数浓度差相关。根据所检查的情况，EIL气溶胶尺寸分布因来自STBL气溶胶而来自STBL气溶胶的不同程度的影响。这些结果强调了EIL在影响成核和气溶胶气候相互作用方面的重要作用。

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