[A-CG46] Biogeochemical Cycles in Land Ecosystem

[ACG46-08] Variations of Gaseous Elementary Mercury Concentrations over the Forest of Japanese Larch at Fuji North Observation Site in Japan

*Akinori Takeuchi¹, Yoshiyuki Takahashi¹ (1.National Institute for Environmental Studies, Japan)

Keywords:Atmospheric Hg, Japanese Larch, Seasonal Variations, Atomic Fluorescence Spectrometry

Terrestrial ecosystems play important roles in mercury (Hg) biogeochemical cycles. Gaseous elementary Hg (GEM) concentrations have been monitored over the forest of Japanese Larch at Fuji North Observation Site in Japan since February, 2024. Seasonal average GEM concentrations in winter and sprng were relatively higher than those in summer and fall, and a standard deviation of the GEM concentrations in summer was relatively higher than the others. In terms of monthly averages, the GEM conccentration in Sept. was the lowest, whereas that in April indicated the highest. The GEM concentrations at this study site from February and May, November, and December were consistent with the average GEM concentrations in the northern hemisphere. The GEM concentrations from June and October were, on the other hand, lower than the northern hemisphere GEM average. The observed seasonal and monthly variations at this study site are unique among the GEM monitoring sites in Japan.