2026-03-08T18:04:52Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02015997 2025-06-02T04:31:07Z 1727147343679:1730442506844:1730442507624

Time rate of atmospheric 3He/4He change: An attempt to measure anthropogenic CO2 flux SANO, Yuji SANO Yuji open access Taking into account recently published data, the author assesses possible time rate change of atmospheric 3He/4He ratio. Three independent estimations are considered and the common value of the 3He/4He variations is proposed. The most reliable decreasing rate of atmospheric 3He/4He ratio, 0.032 ± 0.013 %/year is consistent with the anthropogenic emission of crustal helium of 3.1x1011 mol/year estimated by the statistics of global fossil fuel exploitation and the probable carbon/helium ratio in the fuel. Because of the inert chemistry of helium, atmospheric 3He/4He change may provide a marker against which to calibrate the absolute flux and retention of anthropogenic CO2 in the atmosphere. HIROSHIMA UNIVERSITY 1993-07-30 eng departmental bulletin paper VoR https://doi.org/10.15027/53123 https://hiroshima.repo.nii.ac.jp/records/2015997 10.15027/53123 0075-4374 AA00706718 Journal of science of the Hiroshima University. Series C, Geology and mineralogy Journal of science of the Hiroshima University. Series C, Geology and mineralogy 9 4 597 597 602 https://hiroshima.repo.nii.ac.jp/record/2015997/files/JSHUC_9-4_597.pdf 542.0 KB