The spatial and temporal variations of atmospheric CO2
at 8-13 km from April 1993 to March 2005 were observed by measuring CO2
concentrations in samples collected biweekly from a commercial airliner between
Australia and Japan.
The 12-year record between 30N and 30S revealed several characteristics for CO2
interannual variabilities in the upper troposphere. The most significant
year-to-year change was found in a large increase in the growth rate during
1997/98 and 2002/03 that were associated with the ENSO
events. During these years, changes in north-to-south gradient of latitudinal
distribution and seasonal cycle were observed compared to data during the
normal years.
Author: H. Matsueda, Y. Sawa, A. Wada, and S. Taguchi (hmatsued at mri-jma dot go dot jp)
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