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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >LAGRANGIAN EVOLUTION OF AN AEROSOL COLUMN DURING THE ATLANTIC STRATOCUMULUS TRANSITION EXPERIMENT
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LAGRANGIAN EVOLUTION OF AN AEROSOL COLUMN DURING THE ATLANTIC STRATOCUMULUS TRANSITION EXPERIMENT

机译：大西洋纹状体转换实验中气溶胶柱的拉格朗日演化

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Two Lagrangian experiments were carried out during the Atlantic Stratocumulus Transition Experiment (ASTEX) with the intent of looking at aerosol evolution in the marine boundary layer (MBL). The second Lagrangian (L2) took place below broken stratus clouds and was more successful since little precipitation reached the surface. Aerosol below the inversion was primarily an aged pollution aerosol from central Europe. Vertical variability in aerosol concentrations was generally characterized by highest concentrations in the moist surface and transition layers. Concentrations were a factor of 2 or more lower in the dry subcloud layer and cloud layer and dropped to less than one tenth of surface values in the free troposphere above cloud. This behavior reflected the decoupled boundary layer below the main inversion and complicated the assessment of Lagrangian aerosol evolution. No evidence for new particle formation was observed during L2, and aerosol evolution proceeded only by mixing, coagulation, and removal mechanisms. An entrainment rate of about 0.6 cm s(-1) from the free troposphere into the MBL was a key parameter affecting aerosol evolution and resulted in about a 35% column dilution during the 34-hour L2 measurement period. Aerosol evolution in the decoupled subcloud and surface marine layer is consistent with an entrainment rate of about 0.45 cm s(-1) into the surface layer and about 0.25 cm s(-1) out of the layer. The ability to resolve the effects of separate processes influencing both gas and aerosol during Lagrangian evolution will depend upon (1) an adequate assessment of the variability in the air mass, (2) the ability to characterize this variability relative to the uncertainties in resampling the air mass, and (3) the extent to which the substantial changes due to entrainment alone can be reliably determined. [References: 13]
机译：在大西洋层积云过渡实验（ASTEX）期间进行了两次拉格朗日实验，目的是观察海洋边界层（MBL）中的气溶胶演变。第二次拉格朗日（L2）发生在破碎的地层云以下，由于很少有降水到达地表，因此更为成功。反转以下的气溶胶主要是来自中欧的老化污染气溶胶。气溶胶浓度的垂直变化通常以潮湿表面和过渡层中的最高浓度为特征。在干燥的亚云层和云层中，浓度降低了2倍或更多，而在云层上方的自由对流层中，其浓度下降到表面值的十分之一以下。这种行为反映了主反演之下解耦的边界层，并使拉格朗日气溶胶演变的评估复杂化。在L2期间未观察到新颗粒形成的证据，并且仅通过混合，凝结和去除机制进行了气溶胶的演化。从自由对流层到MBL的夹带率约为0.6 cm s（-1）是影响气溶胶演变的关键参数，在34小时的L2测量期间导致大约35％的色谱柱稀释度。解耦的亚云层和表层海洋层中的气溶胶演化与表层约0.45 cm s（-1）的夹带率和层外约0.25 cm s（-1）的夹带率是一致的。解决拉格朗日演化过程中影响气体和气溶胶的独立过程的影响的能力将取决于（1）对空气质量变异性的充分评估，（2）相对于重采样空气中的不确定性表征这种变异性的能力。空气质量;（3）可以可靠地确定仅因夹带引起的实质性变化的程度。 [参考：13]

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