title: Modeling dry and wet deposition of sulfate, nitrate, and ammonium ions in Jiuzhaigou National Nature Reserve, China using a source-oriented CMAQ model: Part II. Emission sector and source region contributions.
abstract: A source-oriented Community Multiscale Air Quality (CMAQ) model driven by the meteorological fields generated by the Weather Research and Forecasting (WRF) model was used to study the dry and wet deposition of nitrate (NO3(-)), sulfate (SO4(2-)), and ammonium (NH4(+)) ions in the Jiuzhaigou National Nature Reserve (JNNR), China from June to August 2010 and to identify the contributions of different emission sectors and source regions that were responsible for the deposition fluxes. Contributions from power plants, industry, transportation, domestic, biogenic, windblown dust, open burning, fertilizer, and manure management sources to deposition fluxes in JNNR watershed and four EANET sites are determined. In JNNR, 96%, 82%, and 87% of the SO4(2-), NO3(-) and NH4(+) deposition fluxes are in the form of wet deposition of the corresponding aerosol species. Industry and power plants are the two major sources of SO4(2-) deposition flux, accounting for 86% of the total wet deposition of SO4(2-), and industry has a higher contribution (56%) than that of power plants (30%). Power plants and industry are also the top sources that are responsible for NO3(-) wet deposition, and contributions from power plants (30%) are generally higher than those from industries (21%). The major sources of NH4(+) wet deposition flux in JNNR are fertilizer (48%) and manure management (39%). Source-region apportionment confirms that SO2 and NOx emissions from local and two nearest counties do not have a significant impact on predicted wet deposition fluxes in JNNR, with contributions less than 10%. While local NH3 emissions account for a higher fraction of the NH4(+) deposition, approximately 70% of NH4(+) wet deposition in JNNR originated from other source regions. This study demonstrates that S and N deposition in JNNR is mostly from long-range transport rather than from local emissions, and to protect JNNR, regional emission reduction controls are needed.
authors.affiliation: Department of Environment, College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Qiao
authors.affiliation: Department of Environment, College of Architecture and Environment, Sichuan University, Chengdu 610065, China. Electronic address: tangya@scu.edu.cn.
authors.forename: Ya
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77845, USA.
authors.forename: Sri Harsha
authors.initials: SH
authors.lastname: Kota
authors.affiliation: Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77845, USA.
authors.forename: Jingyi
authors.initials: J
authors.lastname: Li
authors.affiliation: Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77845, USA.
authors.forename: Li
authors.initials: L
authors.lastname: Wu
authors.affiliation: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77845, USA. Electronic address: qying@civil.tamu.edu.
authors.forename: Qi
authors.initials: Q
authors.lastname: Ying
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D064751:Ammonium Compounds / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D008956:Models, Chemical; D009566:Nitrates / Q000032:analysis*; D012621:Seasons; D013431:Sulfates / Q000032:analysis*; D014887:Weather
chemical_list: D000393:Air Pollutants; D064751:Ammonium Compounds; D009566:Nitrates; D013431:Sulfates
keywords: Long range transport; Nitrogen deposition; Precipitation; Protected area; Source apportionment; Sulfur deposition