Research On Black Carbon Aerosol Over China's Seventh Arctic Scientific Expedition Route

Black carbon aerosols are components of atmospheric aerosols that are released incompletely and affect the Earth's atmosphere,the radiation balance and the energy budget of the earth's surface,which in turn has an impact on global climate change.At present,there are mainly two kinds of research on black carbon aerosol: one is the observation of black carbon aerosol concentration and the influencing factor analysis;the other is the simulation research on the radiation coercion of black carbon aerosol.As the "amplifier" of global climate change in the Arctic,changes in the concentrations of black carbon aerosols are bound to have an impact on the atmospheric and surface energy budget of the ice and snow in the Arctic.However,in the Arctic,there are few fixed observation sites for black carbon aerosol and a lack of overall study on the spatial distribution of black carbon aerosols over the Arctic at high latitudes.From July to September 2016,during the 7th Arctic Scientific Expedition in China,we observed the concentration of black carbon aerosols over the path of navigation using the AE-31 black carbon instrument.The airside latitude ranged from 31.31 ° N to 82.88 ° N.In this paper,by analyzing the observation results,the concentration level and distribution of black carbon aerosol on the route are studied.The main conclusions are as follows:(1)The spatial variability of black carbon aerosols in previous aeronautical measurements is relatively consistent: high concentrations of black carbon aerosol are observed at mid-latitudes and low concentrations at relatively high latitudes.The high concentration of black carbon aerosol in the Arctic Ocean during the survey may be related to the influence of cross-border transport of high-concentration polluted air masses by specific segments.(2)The change of black carbon aerosol concentration over the course of the 7th Arctic scientific expedition has a relatively obvious seasonal variation: the return black carbon aerosol concentration is relatively high in the corresponding sea area,especially in Japan Sea,the Pacific Northwest Pacific,the Arctic Ocean within the scope of the seasonal differences more pronounced.(3)The influence of meteorological elements on the concentrations of black carbon aerosols at sea and over the ocean is rather complicated,which can be manifested in some sea areas and not in some sea areas.Considering that the weather phenomena affecting the wet deposition of black carbon aerosol generally have short durations,they show a strong correlation when analyzing meteorological elements affecting black carbon aerosol concentration in a particular segment for a short period of time.(4)Based on HYSPLIT retrograde air mass trajectory model,the seasonal variation of black carbon aerosols on the whole route was found.The main reason for the obvious seasonal difference of black aerosol carbon concentrations in the outgoing and return waters was the terrestrial transport changes in intensity.(5)Based on MODIS AOD remote sensing image and AirFire Model.It is clear that the cross-border transport of air pollutants released by fire combustion in Russia's Siberia area has a significant effect on the concentration of black carbon aerosol over the Arctic Ocean.