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Long‐term monitoring of carbon and oxygen isotope ratios of stratospheric CO 2 over Japan
Author(s) -
Gamo Toshitaka,
Tsutsumi Makoto,
Sakai Hitoshi,
Nakazawa Takakiyo,
Machida Toshinobu,
Honda Hideyuki,
Itoh Tomizo
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl03269
Subject(s) - stratosphere , environmental science , atmospheric sciences , troposphere , carbon dioxide , altitude (triangle) , oxygen , carbon fibers , oxygen 18 , atmosphere (unit) , isotopes of carbon , environmental chemistry , total organic carbon , chemistry , geology , meteorology , materials science , physics , geometry , mathematics , organic chemistry , composite number , composite material
We have been measuring stable isotopic ratios of carbon (δ 13 C) and oxygen (δ 18 O) of carbon dioxide in the stratosphere (18–35 km altitudes) over Japan since 1985, presenting here the first temporal δ 13 C and δ 18 O records between 1985 and 1991. The stratospheric δ 13 C is gradually decreasing due to anthropogenic effects with a rate of approximately −0.03‰ y −1 , which is similar to the tropospheric value. The previously found 18 O enrichment in stratospheric CO 2 has been maintained almost steadily during the 6 years, with a monotonous δ 18 O increase with increasing altitude up to 35 km over Japan.