Title: A 20-year observation (1991-2009) of wet nitrogen (N) deposition in Megacity Shanghai

Authors: Jianfei Du; Tiantao Cheng; Xiang Li

Addresses: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, China; Shanghai Meteorological Bureau, 166 Puxi Road, Shanghai 200030, China ' Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China ' Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, China; Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China

Abstract: We present measurements of wet deposition of inorganic N (AIN, including NO3-N and NO4+-N) in Shanghai over the period 1991-2009. These data series are obtained from the Shanghai Weather monitoring network which consists of nine monitoring stations which are homogeneously spread over the Shanghai. These long-term measurements allow for a trend analysis over this period, which are to a large extent not influenced by the year to year variations in meteorological circumstances. The wet deposition flux of NO3-N and NO4+-N increased from 1991 to 1998, and then decreased from 1999 to 2009. Average annual wet N deposition fluxes appeared to vary with season, 40% occurred in the hot season (from June to August), and exhibited a good correlation with the precipitation depth. Wet N deposition in precipitation can provide a useful dataset to assess atmospheric environment and its impacts on ecosystem in Shanghai.

Keywords: wet deposition; nitrogen flux; megacity Shanghai; precipitation.

DOI: 10.1504/IJETM.2016.083664

International Journal of Environmental Technology and Management, 2016 Vol.19 No.5/6, pp.444 - 454

Accepted: 16 Jan 2017
Published online: 12 Apr 2017 *

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