Measurements and Analyses of Marine Boundary Layer and Aerosol Processes

9700845 Wang本研究的目的是利用飞机观测来量化影响大气气溶胶和前体演变的边界层云和湍流过程。该项目是北大西洋区域气溶胶特征试验（ACE-2）的一部分，该试验将于1997年6月和7月在亚热带东北大西洋上空进行，是一项国际合作项目。ACE-2的主要目标是利用飞机、船载和地面测量，研究与辐射强迫和气候有关的大气气溶胶特性。Pelican是海军研究生院跨学科遥控飞机研究中心（CIRPAS）的一架飞机，将成为该项目的主要测量平台。这架飞机配备了测量气象参数、辐射、气溶胶特性和一些化学成分的仪器。英国气象研究中心的C-130航班将是参与拉格朗日实验的另一架飞机。在拉格朗日实验中，几乎连续的测量将跟随一个带标签的空气柱进行两到三天。在ACE-1期间测试的一种特殊的圆形飞行模式将在ACE-2中用于鹈鹕测量，以获得准确的夹带速度和表征边界层中以及边界层与自由对流层之间气溶胶运输的代表性湍流统计数据。本研究将着重于拉格朗日测量过程中边界层和云的演化，以及演化对气溶胶动力学和化学的影响。具体的重点将是夹带测量和分析，在解耦边界层中水汽和云核粒子的运输，小积云的作用以及与穿透积云相关的有组织的中尺度流在气溶胶演变中的作用。云微物理和气溶胶特性将研究与上述边界层动力过程的关系。

9700845 Wang The objective of this study is to quantify the boundary layer cloud and turbulence processes that affect the evolution of atmospheric aerosols and precursors using aircraft observations. The project is part of the North Atlantic Regional Aerosol Characterization Experiment (ACE-2) which will be conducted in June and July, 1997, over the subtropical Northeastern Atlantic Ocean as an international collaborative effort. The main objectives of ACE-2 are to study the properties of atmospheric aerosols relevant to radiative forcing and climate using aircraft, ship-board, and ground-based measurements. The Pelican, an aircraft from the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS), Naval Postgraduate School, will be the major measurement platform for this project. The aircraft is equipped with instruments measuring meteorological parameters, radiation, aerosol properties, and some chemical constituents. The UK Meteorological Research Flight C-130 will be the other aircraft participating in the Lagrangian experiments, where nearly continuous measurements will be made following a tagged air column for two to three days. A special circular flight pattern, tested during ACE-1, will be implemented for the Pelican measurements in ACE-2 to obtain accurate entrainment velocity and representative turbulence statistics that characterize aerosol transport in the boundary layer and between the boundary layer and the free troposphere. This study will emphasize the boundary layer and cloud evolution during the Lagrangian measurements and how the evolution affects aerosol dynamics and chemistry. The specific focus will be on entrainment measurements and analysis, transport of moisture and cloud nucleating particles in the decoupled boundary layers, the role of small cumulus and the organized mesoscale flow associated with penetrating cumulus in aerosol evolution. Cloud microphysics and aerosol characteristics will be studied in relation to the above boundary layer dyna mical processes.