Measurements of Tropospheric Nitric Acid and Aerosols

小行星9223209 该项目包括对流层氮和硫循环的研究，作为了解营养物和气溶胶对气候影响的一种方式。 这项工作可分为三大领域： (1)ASTEX/法师实地项目刚刚完成。 PI小组从三个平台收集了一个月的过滤器，撞击器和扩散管样品：R/V Oceanus，圣玛利亚岛和NCAR Electra。 硫酸盐和MSA测量是评估海洋硫收支的关键，在两个拉格朗日实验期间研究了其演变。 该提案将分析收集的样本，解释数据，测试大量假设（与气溶胶、云和气候有关），并在ASTEX/法师PI之间组织研讨会和联合出版物。 该ASTEX/法师数据的目标是充分了解海洋气溶胶的产生和清除系统，以便将其纳入海洋气溶胶、云凝结核、云、大气辐射特性和气候的预测模型中。 (2)该提案将继续在莫纳罗亚山进行一系列硝酸测量。 硝酸的多年循环数据表明，新的固定氮向偏远海洋的输送可能取决于降水和输送模式的长期气候变化。 PI的长期气溶胶记录也将有助于了解Pinatubo衍生的硫酸盐气溶胶的全球影响。 (3)这一建议将继续在IGAC活动中发挥积极作用，包括在1994年或1995年规划和执行一项重大的南半球国际气溶胶实验。 ***

9223209 Huebert This project includes the study of the nitrogen and sulfur cycles in the troposphere, as a way of understanding the impact of nutrients and aerosols on climate. This work can be divided into three general areas: (1) The ASTEX/MAGE field program has just been completed. The PIs group collected a month's worth of filter, impactor, and denuder samples from three platforms: the R/V Oceanus, Santa Maria Island, and the NCAR Electra. The sulfate and MSA measurements are critical to valuating the marine sulfur budget, whose evolution was studied during two Lagrangian experiments. This proposal will analyze the samples collected, interpret the data, test a large number of hypotheses (related to aerosols, cloud, and climate), and organize workshops and joint publications among the ASTEX/MAGE PIs. The goal for this ASTEX/MAGE data is to understand the marine aerosol production and removal systems well enough to include them in predictive models of marine aerosols, CCN, clouds, atmospheric radiative properties, and climate. (2) This proposal will continue a series of nitric acid measurements at Mauna Loa. The suggestion in data of a multi-year cycle in nitric acid implies that the delivery of new fixed nitrogen to the remote oceans may depend on long-term climatological changes in precipitation and transport patterns. The PIs long-term aerososl record will also help in understanding the global impact of Pinatubo-derived sulfate aerosol. (3) This proposal will continue an active role in IGAC activities, including the planning and execution of a major international southern-hemisphere aerosol experiment in 1994 or 1995. ***