Chemical Composition and Sources of Marine Aerosol over the Western North Pacific Ocean in Winter

摘要: Atmospheric deposition of long-range transported continental substances from natural and anthropogenic sources affects biogeochemical processes in marine systems. Emissions sea spray contribute aerosol particles to the atmosphere. Despite importance dispersion atmospheric involving within remote atmosphere, knowledge various water-soluble ions is limited because insufficient observations. Concentrations Total suspended particulates (TSPs) major inorganic (Cl−, Na+, SO42−, Mg2+, Ca2+, K+, NO3−, NH4+), as well organic nitrogen (ON-N) values, were measured collected over western north Pacific (WNP) during a cruise 3 December 2014 13 March 2015. Aerosol samples analyzed determine their chemical characteristics source apportionment for this region influence on open ocean when air masses are continent winter. TSP mass concentrations ranged 14.1 136.0 μg/m3 with an average 44.8 ± 28.1 μg/m3. TSPs higher near coast (close Qingdao Xiamen) lower ocean. The total accounted 51.1% TSP. Cl− had highest among ions, followed by NH4+, respectively. However, showed deficit relative Na+ most samples, likely related heterogeneous reactions Most K+ salt, while other sources. non-sea-salt (nss) fractions Mg2+ derived crust, nss-SO42− NO3− ON several sources, including NOx volatile compounds (anthropogenic sources) or NH3 gaseous hydrocarbons, crustal biogenic