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Characterization of Atmospheric Ammonia over Xi’an, China

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Volume: 9 | Issue: 2 | Pages: 277-289
DOI: 10.4209/aaqr.2008.10.0043
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Jun-Ji Cao 1,2, Ting Zhang1, Judith C. Chow3, John G. Watson3, Feng Wu1, Hua Li1

  • 1 SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, (null), China
  • 2 Department of Environmental Science, Xi’an Jiaotong University, Xi’an, China
  • 3 Division of Atmospheric Sciences, Desert of Research Institute, Reno, USA

Abstract

Continuous measurements of atmospheric ammonia (NH3) between April 2006 and April 2007 were conducted at an urban site and a suburban site in Xi’an, northwest China. NH3 was collected using Ogawa passive samplers every sixth day. At the same time, NH4+ in fine particles was collected using battery-powered mini-volume samplers. The annual average concentrations of NH3 were 12.9 µg/m3 and 14.1 µg/m3, at the urban and suburban sites, respectively. The NH3 concentrations reached a maximum (~22.8-35.3 µg/m3) in June and July and were minimum (~3.0-4.7 µg/m3) in December, which was closely linked with NH3 volatilization under different ambient temperatures. The seasonal variation in NH3 was summer > spring > autumn > winter at both sites, which may be ascribed to the impact of biological emission sources such as agricultural activity. NH3 and NH4+ aerosol concentrations were weakly correlated, implying that gas-particle reactions are influenced by many factors such as sources, meteorology and removal. Average NH3/NH4+

Keywords

NH3 NH4+ Aerosol, Agricultural activity


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