Long-term monitoring of carbon and oxygen isotope ratios of stratospheric CO2 over Japan
Journal Article
·
· Geophysical Research Letters
- Univ. of Tokyo (Japan)
We have been measuring stable isotopic ratios of carbon (delta-C-13) and oxygen (delta-O-18) of carbon dioxide in the stratosphere (18-35 km altitudes) over Japan since 1985, presenting here the first temporal delta-C-13 and delta-O-18 records between 1985 and 1991. The stratospheric delta-C-13 is gradually decreasing due to anthropogenic effects with a rate of approximately -0.03%/y, which is similar to the tropospheric value. The previously found O-18 enrichment is stratospheric CO2 has been maintained almost steadily during the 6 years, with a monotonous delta-O-18 increase with increasing altitude up to 35 km over Japan.
- OSTI ID:
- 57419
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 4 Vol. 22; ISSN GPRLAJ; ISSN 0094-8276
- Country of Publication:
- United States
- Language:
- English
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