Concentration variations of tropospheric nitrous oxide over Japan

Citation
K. Ishijima et al., Concentration variations of tropospheric nitrous oxide over Japan, GEOPHYS R L, 28(1), 2001, pp. 171-174
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL RESEARCH LETTERS
ISSN journal
0094-8276 → ACNP
Volume
28
Issue
1
Year of publication
2001
Pages
171 - 174
Database
ISI
SICI code
0094-8276(20010101)28:1<171:CVOTNO>2.0.ZU;2-1
Abstract
Aircraft measurements of the tropospheric N2O concentration were made over Japan during the period from October 1991 to June 1999. The observed values of the N2O concentration showed clear evidence of the secular increase, wi th mean rates of 0.50 to 0.64 ppbv/yr for selected height intervals of 0-2, 2-4, 4-6, 6-8 km and 8 km-tropopause. Although the seasonality of the N2O concentration was hardly observable throughout the troposphere, interannual variations with periods of about 2 years were clearly found. The average N 2O concentrations over the observation period for the above 5 height interv als were almost identical with each other, showing no appreciable vertical gradient of the concentration. This suggests that N2O emissions from the gr ound surface around Japan are very weak and the emitted N2O is mixed well i n the troposphere.