[Effects of global climate change on Japanese cedar pollen concentration in air--estimated results obtained from Yamagata City and its surrounding area].
The effects of global warming on Japanese cedar pollen concentration in air were examined. There was a significant increase in total pollen count in years where small or average values of pollen dispersion were observed and where summertime temperatures were postulated to have risen from 2 to 5 degrees C. There were no remarkable differences in total pollen count in years where large values of pollen dispersion were observed. On the other hand, a drastic decrease in total pollen count was expected when summertime temperatures were postulated to have dropped from 2 to 5 degrees C. A major factor controlled the value of total pollen count was examined by use of a simulation method of airborne Cryptomeria japonica pollen. The values of total pollen count mainly controlled by the amount of male flower at basins and in Japanese cedar forested areas, and the manner in which plains isolated from pollen sources are considered in part to be subjected to meteorological conditions. The difference of initiation time of the pollen season has no great influence on the values of total pollen count.
Takahashi
Y
Y
Yamagata Prefectural Institute of Public Health.
Kawashima
S
S
Aikawa
S
S
D000397:Air Pollution / Q000032:analysis*; D017752:Greenhouse Effect; D007564:Japan; D011058:Pollen; D014197:Trees