| Title: | Global Importance of Hydroxymethanesulfonate in Ambient Particulate Matter: Implications for Air Quality |
| Author(s): | Moch JM; Dovrou E; Mickley LJ; Keutsch FN; Liu Z; Wang Y; Dombek TL; Kuwata M; Budisulistiorini SH; Yang L; Decesari S; Paglione M; Alexander B; Shao J; Munger JW; Jacob DJ; |
| Address: | "Department of Earth and Planetary Sciences Harvard University Cambridge MA USA. John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA USA. Department of Chemistry and Chemical Biology Harvard University Cambridge MA USA. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China. Analytical Sciences Division, RTI International, Research Triangle Park Durham NC USA. Asian School of the Environment and Earth Observatory of Singapore Nanyang Technological University Singapore. Now in the Department of Atmospheric and Oceanic Sciences, School of Physics, and BIC-ESAT Peking University Beijing China. Now in Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry University of York York UK. Italian National Research Council - Institute of Atmospheric Sciences and Climate (CNR-ISAC) Bologna Italy. Department of Atmospheric Sciences University of Washington WA USA. College of Flying Technology Civil Aviation University of China Tianjin China" |
| ISSN/ISBN: | 2169-897X (Print) 2169-8996 (Electronic) 2169-897X (Linking) |
| Abstract: | "Sulfur compounds are an important constituent of particulate matter, with impacts on climate and public health. While most sulfur observed in particulate matter has been assumed to be sulfate, laboratory experiments reveal that hydroxymethanesulfonate (HMS), an adduct formed by aqueous phase chemical reaction of dissolved HCHO and SO(2), may be easily misinterpreted in measurements as sulfate. Here we present observational and modeling evidence for a ubiquitous global presence of HMS. We find that filter samples collected in Shijiazhuang, China, and examined with ion chromatography within 9 days show as much as 7.6 mug m(-3) of HMS, while samples from Singapore examined 9-18 months after collection reveal ~0.6 mug m(-3) of HMS. The Shijiazhuang samples show only minor traces of HMS 4 months later, suggesting that HMS had decomposed over time during sample storage. In contrast, the Singapore samples do not clearly show a decline in HMS concentration over 2 months of monitoring. Measurements from over 150 sites, primarily derived from the IMPROVE network across the United States, suggest the ubiquitous presence of HMS in at least trace amounts as much as 60 days after collection. The degree of possible HMS decomposition in the IMPROVE observations is unknown. Using the GEOS-Chem chemical transport model, we estimate that HMS may account for 10% of global particulate sulfur in continental surface air and over 25% in many polluted regions. Our results suggest that reducing emissions of HCHO and other volatile organic compounds may have a co-benefit of decreasing particulate sulfur" |
| Keywords: | aerosols air pollution cloud chemistry formaldehyde hydroxymethanesulfonate sulfate; |
| Notes: | "PubMed-not-MEDLINEMoch, Jonathan M Dovrou, Eleni Mickley, Loretta J Keutsch, Frank N Liu, Zirui Wang, Yuesi Dombek, Tracy L Kuwata, Mikinori Budisulistiorini, Sri Hapsari Yang, Liudongqing Decesari, Stefano Paglione, Marco Alexander, Becky Shao, Jingyuan Munger, J William Jacob, Daniel J eng 2020/12/08 J Geophys Res Atmos. 2020 Sep 27; 125(18):e2020JD032706. doi: 10.1029/2020JD032706. Epub 2020 Sep 11" |
