Research Article
Impacts of Chemical and Synoptic Processes on Summer Tropospheric Ozone Trend in North China
Table 2
The sum of squared residuals and the fraction of explained variation to the tropospheric O3.
| | | Variables included in the fitting | SSE | Contribution to O3 (%) |
| | | Trend | 10.93 | |
| | Emission | NO2 | 7.27 | 69.73 | | NO2 + CO | 7.10 | 66.75 | | NO2 + CO + HCHO | 6.82 | 63.50 |
| | Circulation | ENSO | 10.16 | 57.69 | | ENSO + PV | 9.26 | 56.63 | | ENSO + PV + EASMI | 7.35 | 60.64 | | ENSO + PV + EASMI + QBO | 7.15 | 55.32 |
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