Instrumentation for Measuring Organic Aerosols in the Calspan Chamber

9807297 HeggInstrumentation for Measuring Organic Aerosols in the Calspan Chamber该项目支持对极性有机化合物的测量，这些化合物将作为Calspan云/气溶胶实验的一部分进行研究。实验将于1998年11月进行，使用的是罗切斯特大学操作的高压Calspan室。该项目的主要科学目标是提高对有机气溶胶前体对新颗粒成核的影响的认识，特别是内部混合的有机-无机颗粒。 PI要求的仪器包分为两部分。 在第一部分，离子色谱仪的升级将允许分析溶解的极性有机化合物，如羧酸和二羧酸。 对于第二部分，PI请求支持升级T。劳伦斯伯克利实验室（Lawrence Berkeley Laboratory） 热演化系统将用于量化颗粒和溶解相中存在的总碳质量。 来自华盛顿大学的一名研究生将接受热分析系统的培训。 因此，该项目支持的仪器，将允许碳质量平衡的Calspan云成核实验开发。 云-气溶胶过程中含碳化合物的改进定量描述将提供实验证据，用于评估最近关于已知有机化合物对云滴影响的理论分析，从而评估气溶胶化学成分对气候强迫的影响。

9807297HeggInstrumentation for Measuring Organic Aerosols in the Calspan Chamber This project supports measurements of polar organic compounds that will be studied as part of the Calspan cloud/aerosol experiment. The experiment will be conducted during November 1998, using the high-pressure Calspan chamber that is operated by the University of Rochester. The main science objective for the project is to improve understanding of the impact of organic aerosol precursors on the nucleation of new particles, particularly, internally mixed organic-inorganic particles. The instrumentation package requested by the PI is in two parts. In part one, the upgrade of the ion chromatography instrument will permit analysis of dissolved polar organic compounds such as carboxylic and dicarboxylic acids. For part two, the PI requests support to upgrade the thermal evolution apparatus developed by T. Novakov (Lawrence Berkeley Laboratory). The thermal evolution system will be used to quantify the total carbon mass present in the particle and dissolved phases. A graduate student from the University of Washington group will be trained on the thermal analysis system. Thus, the project supports instrumentation that will permit a carbon mass balance to be developed for the Calspan cloud nucleation experiments. The improved quantitative description of carbonaceous compounds in cloud-aerosol processes will provide experimental evidence that is intended to evaluate recent theoretical analyses on the impact of known organic compounds on cloud drops, and thus on climate forcing by aerosol chemical components.