Vol. 22, issue 08, article # 7

Abstract:

Simultaneous measurements of optical and microphysical parameters of near-water aerosol were performed over White Sea in August 2006 during 80-th cruise of RV "Professor Shtockman" from onboard the vessel and in the coastal zone (on the territory of Unskii beacon, southern coast of Dvina Bay). Spatial-temporal variability of the concentrations of aerosol and soot in the marine atmosphere are studied, and the geophysical factors determining this variability are analyzed. The conditions of extremely low aerosol content in the atmosphere with the concentrations of aerosol and soot 1.2-1.7 mg/m3 and 0.01 mg/m3, respectively, were observed both in shipborne and coast-based measurmeents on August 20-23 in anticyclonic conditions in Arctic air mass. Such values are comparable with the values observed in open ocean areas. The regions of central area of White Sea, Kandalaksha Bay and Unskii beacon can be considered as background during the period of the experiment according to the contents of aerosol and soot. The results of comparison of simultaneous shipborne and coast-based measurements of the concentrations of aerosol and soot revealed similarity of their inter-day variability, which is evidence of the fact that the peculiarities of temporal variations, at least during the experiment, have regional scale and are principally determined by the dynamics of synoptic processes of the change of air masses

Keywords:

aerosol; soot; near-water atmosphere; spatial-temporal variability