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Ecosystem respiration derived from 222Rn measurements on Rishiri Island, Japan
- Inoue, Hisayuki Y., Zhu, Chunmao
- Biogeochemistry 2013 v.115 no.1-3 pp. 185-194
- carbon dioxide, ecosystem respiration, gas emissions, islands, radon, snowpack, Japan
- We evaluated the nighttime CO₂flux (ecosystem respiration) on Rishiri Island, located at the northern tip of Hokkaido, Japan, from 2009 to 2011, by using the relationship between atmospheric²²²Rn and CO₂concentrations. The annual mean CO₂flux was 1.8 μmol m⁻² s⁻¹, with a maximum monthly mean in July (4.6 ± 2.6 μmol m⁻² s⁻¹) and a broad minimum from December to March (0.33 ± 0.29 μmol m⁻² s⁻¹). The annual mean was comparable to fluxes at the JapanFlux sites in northern Japan. During the season of snow cover (mid-December to early April), the CO₂flux was low (0.45 ± 0.43 μmol m⁻² s⁻¹). Total annual respiration was estimated at 679 ± 174 g cm⁻², about 8 % of which occurred during the season of snow cover.