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Increase in the atmospheric nitrous oxide concentration during the last 250 years
Author(s) -
Machida T.,
Nakazawa T.,
Fujii Y.,
Aoki S.,
Watanabe O.
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 - 10.1029/95gl02822
Subject(s) - nitrous oxide , atmospheric sciences , environmental science , ice core , atmospheric pressure , atmosphere (unit) , atmospheric chemistry , environmental chemistry , climatology , meteorology , geology , chemistry , ozone , oceanography , geography , organic chemistry
In order to estimate the concentrations of atmospheric nitrous oxide (N 2 O) during the last 250 years, air samples were extracted from an Antarctic ice core, H15, using a dry extraction system and were then analyzed with a precision of ±2 ppbv. The results obtained were clearly less scattered and much tighter than those of the previous studies. Our data showed that the concentrations of atmospheric N 2 O in the 18th century were about 276 ppbv on average. It was also obvious that the N 2 O concentration began to increase in the mid‐19th century and reached approximately 293 ppbv around 1965, the trend of the concentration increase correlating quite well with the direct atmospheric measurements at the South Pole. Such an increase in the atmospheric N 2 O concentration is thought to be of anthropogenic origin.