Snowpack Chlorine Chemistry in Wintertime Urban Boundary Layer

本项目主要研究道路（除冰）盐对城市空气质量的影响。氯从道路盐（NaCl）转移到气相可以改变大气污染物的命运。将进行实地工作和建模，以调查城市积雪产生硝基氯（ClNO2）的情况。主要有三种假设：(1)含盐雪通过N2O5与雪氯化物的非均相反应产生ClNO2；(2) N2O5向城市积雪的沉积与ClNO2的生成一致，可以通过近地表垂直剖面观测和量化；(3)积雪ClNO2的产生对城市冬季日间大气氧化条件的影响。该项目支持研究生和本科生的培养。外展活动将通过澳大自然历史博物馆科学传播研究员计划进行，该计划是美国国家科学基金会公共网络门户网站的一部分。

This project focuses on investigating the effects of road (de-icing) salt application on urban air quality. The transfer of chlorine from road salts (NaCl) to the gas phase can alter the fate of atmospheric pollutants. Both field work and modeling will be conducted to investigate the production of nitryl chloride (ClNO2) from an urban snowpack. The three main hypotheses are: (1) ClNO2 is produced from road salt-laden snow by heterogeneous reaction of N2O5 with snow chloride; (2) N2O5 deposition to the urban snowpack, coincident with ClNO2 production, can be observed and quantified through near-surface vertical profile measurements; and (3) Snowpack ClNO2 production impacts urban winter daytime atmospheric oxidant conditions. This project supports the training of both graduate and undergraduate students. Outreach activities will be conducted through the UM Museum of Natural History Science Communication Fellows Program, part of the NSF Portal to the Public Network.