Enrichment of airborne Japanese cedar (Cryptomeria japonica) pollen in mountain ranges when passing through a front accompanying temperate low pressure

Abstract

Values obtained by the real-time pollen monitors set up at 14 measuring points in the Tohoku region indicate that a large amount of Japanese cedar pollen was dispersed along the western region and northern flank of the Ou Mountain Range when a front accompanying the temperate low pressures passed through the west sea of northern Hokkaido. We are sure that this phenomenon is related to pollen enrichment by mountain ranges. The time at which highest concentrations of pollen grains were observed shifted from the western to the eastern side, in accordance with the path of the front. No pollen was seen after the passage of the cold front.