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    Original Research Papers

    Measurements of atmospheric CO2 from a meteorological tower in Tsukuba, Japan

    Authors:

    Hisayuki Yoshikawa Inoue ,

    Geochemical Research Department, Meteorological Research Institute, JP
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    Hidekazu Matsueda

    Geochemical Research Department, Meteorological Research Institute, JP
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    Abstract

    Since February 1992, measurements of atmospheric CO2 at 200 m above the ground have been taken from a meteorological tower (lat 36°04′N, long 140°07′E, 25 m a.s.l.) in Tsukuba, central Japan. A diurnal variation of atmospheric CO2 at 200 m was clearly observed in summer and less clearly in winter. In summer, the maximum occurred a few hours after dawn and the minimum in the late afternoon; in winter, the CO2 mixing ratio was fairly constant because of temperature inversion below 200 m. The daily mean values of atmospheric CO2 in the afternoon (1300–1600 JST), selected as they were close to the representative values in the planetary boundary layer, were as high as 4 to 6 ppm greater than at stations in remote areas of the same latitudinal zone. This was mainly due to CO2 emissions from anthropogenic sources in central Japan. The peak-to-trough amplitude of the seasonal variation, caused by the CO2 exchange between the air and the land biosphere, ranged from 11 to 14 ppm. Year-to-year changes in the seasonal variation of atmospheric CO2 during the period from May to July were correlated well with the surface air temperature among climate variables that affect the photosynthesis/respiration of the land biosphere. The change in CO2 mixing ratio of the detrended seasonal variation from May to July increased with the surface air temperature, which was suggestive of the larger temperature dependence of respiration rate as compared with that of photosynthesis rate. Over the period from 1993 to 1999, the annual mean of the CO2 mixing ratio increased from 363.0 ppm to 374.6 ppm. The growth rate from February 1992 to January 2000 showed a large interannual variability ranging from −0.8 to 4.6 ppm yr−1 with a mean rate of 2.0 ppm yr−1.

    How to Cite: Inoue, H.Y. and Matsueda, H., 2001. Measurements of atmospheric CO2 from a meteorological tower in Tsukuba, Japan. Tellus B: Chemical and Physical Meteorology, 53(3), pp.205–219. DOI: http://doi.org/10.3402/tellusb.v53i3.16592
      Published on 01 Jan 2001
    Peer Reviewed
     CC BY 4.0
     Accepted on 16 Jan 2001            Submitted on 4 Jan 2000

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