The scavenging ratio of sea-salt components for the winter monsoon was presented on the coastal region of the Sea of Japan. Concentrations of sodium in air and precipitation were analyzed from four monitoring networks, CRIEPI, NPG, NIES/ADORC, and CRIEPI during the period from 1987 to 2008. On the basis of the monitoring data collected, we analyzed (i) seasonal variation and horizontal distribution of sea-salt concentration in air and precipitation, (ii) statistical properties of scavenging ratio on a regional scale, (iii) relationship between scavenging ratio and precipitation intensity, (iv) wet scavenging coefficient on a local scale, and (v) temporal variation of sodium concentration associated with the winter monsoon.
