Inorganic Constituents in Precipitation in Yonezawa City

Since May 1989, the rainfall have been collected at 12 meters above
the ground in Yonezawa City (campus of Faculty of Engineering,
Yamagata University - located in southern inland in Yamagata
Prefecture). Each ion concentration of sodium, potassium, calcium,
magnesium, ammonium, chloride, nitrate, and sulfate, as well as
preciptation amount, electric conductivity and pH have been measured
for each rainfall or each snowfall. Maximum value, minimum value, mean
value, composition ratio and so on are summarized in every each
year. By the blow of north west seasonal wind which sprouts from the
winter over the early spring, the material which seems to be sea salt
from the Sea of Japan and acid deposition from the continent are
observed. Measurements are continued at present.