STUDIES OF FORMATION MECHANISM OF ACID SNOW PARTICLES ACOODING TO THEIR FORMATION PROCESSES

在日本札幌市的郊区和中部地区进行了固体降水化学分析的案例研究，以调查由于雪颗粒生长的机制，即气相沉积或雾凇而导致的降水化学差异。即使在气相沉积生长中，样品也被发现是酸性的。no_3和nss- cl对酸化有促进作用。在环晶生长样品中，nss-SO^2_-浓度相当高。中心城区积雪早期nss-Ca^<2+>浓度较高，酸性较弱。

Case studies of chemical analysis of solid precipitation were carried out at sites on the outskirts and central part of Sapporo City, Japan to investigate the difference in precipitation chemistry owing to the mechanism by which snow particles grow, i.e.by vapor deposition or by riming. Even in vapor depositional growth, the samples were found to be acidic. NO_3-and nss-Cl-contributed to the acidification. In the samples of riming growth, the nss-SO^2_-concentration was considerably high. Snow samples from the site in the central city area were less acidic due to the higher concentration of nss-Ca^<2+> in the early period of snowfalls.