Ozone trends over the United States at different times of day

Yan, Yingying; Lin, Jintai; He, Cenlin

doi:https://doi.org/10.5194/acp-18-1185-2018

Articles | Volume 18, issue 2

https://doi.org/10.5194/acp-18-1185-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-18-1185-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 2

Research article

|

30 Jan 2018

Research article |

| 30 Jan 2018

Ozone trends over the United States at different times of day

Yingying Yan, Jintai Lin, and Cenlin He

Data sets

Pre-Generated Data Files Environmental Protection Agency (EPA) Air Quality System (AQS) http://aqsdr1.epa.gov/aqsweb/aqstmp/airdata/download_files.html

Cold & Warm Episodes by Season NOAA Climate Prediction Center http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/ensoyears.shtml

AMO (Atlantic Multidecadal Oscillation) Index National Oceanic and Atmospheric Administration (NOAA) Earth System Research Laboratory (ESRL) http://www.esrl.noaa.gov/psd/data/timeseries/AMO/

Short summary

Examining observed and simulated ozone at about 1000 sites during 1990–2014, we find a clear diurnal cycle both in the magnitude of ozone trends and in the relative importance of climate variability versus anthropogenic emissions to ozone changes, which has policy implications to mitigate ozone at night and other non-peak hours.