期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 8, 页码 1631-1636出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50303
关键词
ozone; troposphere; seasonal cycle; northern mid-latitudes
资金
- NOAA's Climate Change and Health of the Atmosphere Programs
- European Union Framework 7 (FP7) IP project PEGASOS [FP7-ENV-2010/265148]
At northern midlatitudes the abundance of tropospheric O3 has increased by a factor of approximately 2 since the 1950s. The cause of this increase is generally attributed to increasing anthropogenic precursor emissions, but present chemical and transport models cannot quantitatively reproduce its magnitude. Here we show another manifestation of changes in O3 abundancea shift of the seasonal cycle at northern midlatitudes so that the observed peak concentrations now appear earlier in the year than in previous decades. The rate of this shift has been 3 to 6days per decade since the 1970s. We examine possible reasons to explain this shift and suggest it is due to changes in atmospheric transport patterns combined with spatial and temporal changes in emissions. Detailed modeling is necessary to test these hypotheses; this investigation will provide useful guidance for improving global chemistry-climate models and stringent tests of the model results.
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