Water-soluble organic compounds at a mountain-top site in Colorado,USA |
| |
| Authors: | Shar Samy Lynn R Mazzoleni Subhashree Mishra Barbara Zielinska Anna G Hallar |
| |
| Institution: | 1. Deparment of Chemistry and Molecular Biology, Atmospheric Science, University of Gothenburg, SE-412 96 Gothenburg, Sweden;2. West Bengal Pollution Control Board, Paribesh Bhavan, 10A, Block-LA., Sector III, Bidhannagar, Kolkata 700 098, India;3. SP Technical Research Institute of Sweden, SE-501 15 Borås, Sweden;4. IVL Swedish Environmental Research Institute, P.O. Box 5302, SE‐400 14 Gothenburg, Sweden;5. Swedish National Road and Transport Research Institute, P.O. Box 8072, SE‐402 78 Gothenburg, Sweden;1. Institute for the Dynamics of Environmental Processes CNR, Via Torino 155, 30170 Venezia, Mestre, Italy;2. Department of Environmental Sciences, Informatics and Statistics, University of Venice, Ca'' Foscari, Calle, Via Torino 155, 30170 Venezia, Mestre, Italy;1. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;2. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;3. University of Chinese Academy of Sciences, Beijing 100086, China;4. Environmental Monitoring Center of Fujian, Fuzhou 350003, China |
| |
| Abstract: | Water extracts of atmospheric particulate matter (PM2.5) collected at the Storm Peak Laboratory (SPL) (3210 MSL, 40.45° N, 106.74° W) were analyzed for a wide variety of polar organic compounds. The unique geographical character of SPL allows for extended observations/sampling of the free tropospheric interface. Under variable meteorological conditions between January 9th and January14th 2007, the most abundant compounds were levoglucosan (9–72 ng m?3), palmitic acid (10–40 ng m?3) and succinic acid (18–27 ng m?3). Of 84 analytes included in the GC–MS method, over 50 individual water extractable polar organic compounds (POC) were present at concentrations greater than 0.1 ng m?3. During a snow event (Jan. 11th–13th), the concentrations of several presumed atmospheric transformation compounds (dicarboxylic acids) were reduced. Lower actinic flux, reduced transport distance, and ice crystal scavenging may explain this variability. Diurnal averages over the sampling period revealed a higher total concentration of water extractable POC at night, 211 ng m?3 (105–265 ng m?3), versus day, 160 ng m?3 (137–205 ng m?3), which suggests a more aged nighttime aerosol character. This may be due to the increased daytime convective mixing of local primary emissions from the Yampa Valley. XAD resin extracts revealed a gas-phase partitioning of several compounds, and analysis of cloud water collected at this site in 2002 revealed a similar compound abundance trend. Levoglucosan, a wood smoke tracer was generally found to be the most abundant compound in both aerosol and cloud water samples. Variations in meteorological parameters and local/regional transport analysis play an important interpretive role in understanding these results. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
