Trends of atmospheric methane in the Southern Hemisphere

Details Trends of atmospheric methane in the Southern Hemisphere Trends of atmospheric methane in the Southern Hemisphere

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1063f&link_type=abstract

Geophysical Research Letters, vol. 8, Oct. 1981, p. 1063-1066. Research supported by the Chemical Manufacturers Association, Bio

Computer Science

Sound

26

Air Pollution, Air Sampling, Atmospheric Composition, Methane, Southern Hemisphere, Annual Variations, Atmospheric Sounding

Scientific paper

Atmospheric observations spanning the past three years show that methane increased at 1.2 (plus or minus 0.3)% per year at Cape Grim in Tasmania (41 deg S). This rate of increase can be compared to the 1.9 (plus or minus 0.4)% per year observed at Cape Meares in Oregon (45 deg N) over the past two years. Over the corresponding period the concentration at Cape Grim increased by 1.4 (plus or minus 0.4)% per year. The Southern Hemisphere data also suggest seasonal variations with minimum concentrations in March and maximum in September. These results are based on 26 large-volume stable air samples collected cryogenically in stainless steel flasks and 75 smaller-volume air samples collected in glass flasks, all analyzed by a gas chromatograph using a flame ionization detector.

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