Open AccessTrend analysis of O 3 and CO in the period 1980–1996: A three‐dimensional model study
Author(s) -
Karlsdóttir Sigrún,
Isaksen Ivar S. A.,
Myhre Gunnar,
Berntsen Terje K.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900374
Subject(s) - troposphere , atmospheric sciences , environmental science , ozone , climatology , tropospheric ozone , carbon monoxide , trend analysis , period (music) , planetary boundary layer , meteorology , geology , chemistry , geography , physics , biochemistry , acoustics , turbulence , catalysis , machine learning , computer science
During the last 20–30 years, noticeable changes have occurred in emissions related to anthropogenic activity over the globe. In this study a three‐dimensional chemical transport model for the troposphere (the 3‐D Oslo CTM1 model) is used to investigate how changes in the concentration of carbon monoxide (CO) and ozone (O 3 ) in the period 1980–1996 can be related to changes in emission rates and patterns. The results indicate that changes in both species reflect the emission changes well, especially CO because it is to a large degree driven by CO emissions. The most pronounced effect of the changes in emissions for CO and O 3 is seen in eastern Europe and Southeast Asia. The annual trend in CO and O 3 concentrations in the planetary boundary layer during the period 1980–1996 in eastern Europe is −1.94±0.42 ppbv/yr and −0.01±0.02 ppbv/yr, respectively. In Southeast Asia a positive trend is seen, with 2.29±0.13 ppbv/yr in the CO concentration and 0.6 ± 0.03 ppbv/yr in the O 3 concentration. The agreement between the modeled CO and O 3 concentrations and observations is good. For O 3 an improvement is gained in the modeled results compared with observations, by including changes in emissions from aircraft, and two effects of reduced stratospheric O 3 level (altered photolysis rates and stratospheric‐tropospheric exchange) during the period of study.