A Comparison of Aerosol Organic Carbon Measurements and Models in the Free Troposphere at Mauna Loa Observatory (MLO)

该项目将继续并加强莫纳罗亚天文台（MLO）正在进行的测量项目，通过现在增加对有机气溶胶质量（OM）的半连续测量，定期收集和分析非海盐硫酸盐（NSS）、硝酸盐、钠、铵和硝酸的气溶胶过滤器样本。根据该合同获得的仪器将在MLO进行有机碳（OC）的操作定义测量，在MLO中可以常规采样自由对流层的空气特性。此外，将在MLO进行一些季节性密集的实地测量活动，以更详细地描述OM的特征。OC/NSS比值的行为和变化将在几年内确定，并通过与其他小组的合作，将结果与使用各种模式的数值模拟进行比较。这项研究的结果将使人们更好地了解有机碳化合物在对流层气溶胶化学中的作用，更好地量化有机气溶胶质量将使模型处理中的有机物更准确地表示出来。这项工作的更广泛的影响包括继续在MLO进行与气候高度相关的长期观测，对如何更好地约束化学输送模式和减少气候模式模拟中的不确定性产生重要见解，并为夏威夷大学的学生提供研究和教育机会。

This project will continue and enhance an ongoing measurement program at Mauna Loa Observatory (MLO) to routinely collect and analyze aerosol filter samples for non-sea salt sulfate (NSS), nitrate, sodium, ammonium, and nitric acid by now adding semi-continuous measurements of organic aerosol mass (OM). Instrumentation acquired under this award will make operationally defined measurements of organic carbon (OC) at MLO where air characteristic of the free troposphere can routinely be sampled. In addition, a number of seasonal intensive field measurement campaigns will be conducted at MLO to characterize OM in with even greater detail. The behavior and variability of the OC/NSS ratio will be determined over several years and through collaboration with other groups the results will be compared with numerical simulations using a variety of models. Results from this study will lead to an improved understanding of the role of organic carbon compounds in tropospheric aerosol chemistry, and a better quantification of organic aerosol mass will enable more accurate representations of organic matter in model treatments. The broader impacts of this work include continuing a long-term heritage of highly climate relevant observations at MLO, producing important insights on how to better constrain chemical transport models and reduce uncertainties in climate model simulations, and providing research and educational opportunities for students at the University of Hawaii.