Measurement of Marine Cloud Droplet Size Distributions and Analysis of Relationships to Chemical Fluxes, CCN Concentration, and Boundary Layer Physics

研究人员计划对云层进行光学测量 液滴尺寸谱和液态水含量（LWC）， 云和雨水成分的同时测量， 海洋气溶胶谱和三维风 位于华盛顿州西北海岸。 通过组合 液滴光谱和LWC与其他测量 研究人员将解决：1）液滴和化学涡流 与植被截留云水有关的通量 2）液滴与CCN数的关系 海洋边界层的浓度。 云滴-云凝结核（CCN）关系 将通过比较CCN浓度（从 气溶胶谱）在晴空云滴 浓度的 垂直风速、LWC和液滴 浓度将被合并以产生涡度协方差 综合云滴通量和云滴大小的估算 液滴沉积速度的相关性。 测得的云 水涡流通量将与计算的液滴进行比较 大气沉降通量和云水截留 人造树 与雨水有关的化学通量 与被拦截的云水相比较。 了解液滴/化学通量和CCN/液滴 关系对于表征化学物质是重要的 大气和大气之间的痕量物种循环 以及了解气候对云凝结核的反应 在海洋大气中循环

The investigator plans to make optical measurements of cloud droplet size spectra and liquid water content (LWC) with simultaneous measurements of cloud and rain water composition, aerosol size spectra, and three dimensional winds at a marine site on the NW coast of Washington State. By combining the droplet spectra and LWC with the other measurement the investigators will address both: 1) droplet and chemical eddy fluxes associated with interception of cloud water by vegetation and 2) the relationship between droplet and CCN number concentration in the marine boundary layer. Cloud droplet- cloud condensation nuclei (CCN) relationships will be studied by comparing CCN concentrations (inferred from aerosol size spectra) in clear air to cloud droplet concentrations. Vertical wind speed, LWC, and droplet concentration will be combined to produce eddy covariance estimates of integrated cloud droplet fluxes and the size dependence of droplet deposition velocity. The measured cloud water eddy fluxes will be compared to calculated droplet sedimentation fluxes and cloud water interception by an artificial tree. The chemical fluxes associated with rain will be compared to those associated with intercepted cloud water. Understanding droplet/chemical flux and CCN/droplet relationships is important for characterizing the chemical cycling of trace species between the atmosphere and the biosphere and for understanding the response of climate to CCN cycling in the marine atmospheric.