SGER: High Time Resolution Measurements of Peroxy Acyl Nitrates at Mt. Bachelor Observatory During Intercontinental Chemical Transport Experiment Phase B (INTEX-B)

在2006年4月15日至5月15日的野外活动中，一台新建成的化学电离质谱仪（CIMS）将被部署在俄勒冈州中部的本科山天文台（MBO），该质谱仪具有高灵敏度和1秒分辨率，能够检测一系列过氧烷基硝酸盐（RC(O)OONO2，其中R是有机部分）。MBO密集观测将与来自华盛顿州西雅图的C-130飞机观测重叠，后者是洲际化学运输实验（intx - b）的一个组成部分，而intx - b又是大规模大城市倡议：地方和全球研究观测（MILAGRO）的一部分，该研究旨在研究排放、化学转化和大城市地区运输的影响。过氧酰基硝酸盐是氮氧化物（NOx = NO + NO2）的稳定储存库，在远端对流层中占总氧化氮（NOy）的很大一部分。它们在污染地区的形成以及随后的远距离传输和分解是亚洲人为排放影响太平洋对流层和美国西海岸氮氧化物水平和臭氧光化学的唯一可行机制。该CIMS仪器的部署将通过提供几种过氧酰基硝酸盐的实时测量，增强美国国家航空航天局（NASA）和MBO计划的观测套件，并将允许基于根本不同的过氧酰基硝酸盐测量技术的两种不同仪器的并排比较。这些数据将有助于了解远距离污染输送对大气偏远地区的背景化学和成分的影响。这项研究也将拓宽研究生和博士后的教育经验。

A newly constructed chemical ionization mass spectrometer (CIMS) capable of detecting a range of peroxy acyl nitrates (RC(O)OONO2 where R is an organic moiety) with high sensitivity and 1 second time resolution will be deployed at the Mt. Bachelor Observatory (MBO) in central Oregon during a field campaign planned for April 15 - May 15, 2006. The MBO intensive will overlap with C-130 aircraft observations from Seattle, WA, one component of the Intercontinental Chemical Transport Experiment (INTEX-B), which is in turn part of the broad scale Megacity Initiative: Local and Global Research Observations (MILAGRO), a study of the effects of emissions, chemical transformations, and transport from large urban areas.Peroxy acyl nitrates are labile reservoirs of nitrogen oxides (NOx = NO + NO2), and make up a substantial fraction of total oxidized nitrogen (NOy) in the remote troposphere. Their formation in polluted regions and subsequent long-range transport and decomposition is the only viable mechanism by which anthropogenic emissions in Asia could affect NOx levels and ozone photochemistry in the Pacific troposphere and on the west coast of the United States. Deployment of this CIMS instrument will enhance the observational suite planned by the National Aeronautics and Space Administration (NASA) and MBO by providing real-time measurements of several peroxy acyl nitrates and will allow a side-by-side comparison of two different instruments based on fundamentally different techniques for peroxy acyl nitrate measurement. The data will aid in understanding the effects of long-range pollution transport on the background chemistry and composition of remote regions of the atmosphere. This research will also broaden the educational experience of graduate students and post-doctoral fellows.