Atmospheric nitrogen deposition fluxes during dust and haze events over China Seas
CHEN Chun-qiang1, ZHANG Qiang1, GUAN Xiao-dong1, HUANG Lei1, XUE Di1, WANG Jiao1, LIU Xiao-huan1,2,3
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;
2. Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
3. Laboratory for Marine Ecology and Environment Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
The dry deposition fluxes of total inorganic nitrogen (TIN) to the China Seas during one dust (April 26~May 3, 2011) and one haze event (January 1~7, 2016) were calculated by WRF-CMAQ model. Contributions of the TIN deposition to the marine primary productivity during two events were also analyzed. Two inland polluted regions were selected to explore their contributions to the deposition of TIN over China Seas during the haze event. The results showed that TIN dry deposition flux over China Seas were 6.77 and 3.01mg N/(m2·d) during the dust and haze event respectively, which were about 6.84 and 3.04 times higher than that of the nonevent days. The nitrogen deposition during two events can be converted to new primary biological productivities of 38.5 and 17.1mg C/(m2·d) over China Seas, respectively. Reduced nitrogen (NH3 and NH4+, accounting for 62.2% of TIN dry deposition flux) was the main component of TIN deposition during dust event while the oxidized nitrogen (HNO3 and NO3-, accounting for 84.3% of TIN dry deposition flux) was main components during the haze event. Highest deposition fluxes during dust event was found in Yellow Sea while the lowest fluxes was in Bohai Sea. During the haze days, dry deposition of TIN over Yellow Sea and East China Sea were roughly the same, which were higher than that in Bohai Sea. During this haze event, TIN deposition over the Bohai Sea, Yellow Sea and East China Sea from Beijing-Tianjin-Hebei & Northwest of Shandong (Region 1) were higher than that from Yangtze River Delta (Region 2). The contribution to TIN dry deposition flux over China adjacent seas from Region 1was in the range of 38.7%~74.6% and about 1.14%~12.1% from Region 2.
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