Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 8771-8788, 2017
https://doi.org/10.5194/acp-17-8771-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
19 Jul 2017
Response of the global surface ozone distribution to Northern Hemisphere sea surface temperature changes: implications for long-range transport
Kan Yi1, Junfeng Liu1, George Ban-Weiss2, Jiachen Zhang2, Wei Tao1, Yanli Cheng3, and Shu Tao1 1Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, China
2Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA, USA
3Chinese Academy of Meteorological Sciences, Beijing, China
Abstract. The response of surface ozone (O3) concentrations to basin-scale warming and cooling of Northern Hemisphere oceans is investigated using the Community Earth System Model (CESM). Idealized, spatially uniform sea surface temperature (SST) anomalies of ±1 °C are individually superimposed onto the North Pacific, North Atlantic, and North Indian oceans. Our simulations suggest large seasonal and regional variability in surface O3 in response to SST anomalies, especially in the boreal summer. The responses of surface O3 associated with basin-scale SST warming and cooling have similar magnitude but are opposite in sign. Increasing the SST by 1 °C in one of the oceans generally decreases the surface O3 concentrations from 1 to 5 ppbv. With fixed emissions, SST increases in a specific ocean basin in the Northern Hemisphere tend to increase the summertime surface O3 concentrations over upwind regions, accompanied by a widespread reduction over downwind continents. We implement the integrated process rate (IPR) analysis in CESM and find that meteorological O3 transport in response to SST changes is the key process causing surface O3 perturbations in most cases. During the boreal summer, basin-scale SST warming facilitates the vertical transport of O3 to the surface over upwind regions while significantly reducing the vertical transport over downwind continents. This process, as confirmed by tagged CO-like tracers, indicates a considerable suppression of intercontinental O3 transport due to increased tropospheric stability at lower midlatitudes induced by SST changes. Conversely, the responses of chemical O3 production to regional SST warming can exert positive effects on surface O3 levels over highly polluted continents, except South Asia, where intensified cloud loading in response to North Indian SST warming depresses both the surface air temperature and solar radiation, and thus photochemical O3 production. Our findings indicate a robust linkage between basin-scale SST variability and continental surface O3 pollution, which should be considered in regional air quality management.

Citation: Yi, K., Liu, J., Ban-Weiss, G., Zhang, J., Tao, W., Cheng, Y., and Tao, S.: Response of the global surface ozone distribution to Northern Hemisphere sea surface temperature changes: implications for long-range transport, Atmos. Chem. Phys., 17, 8771-8788, https://doi.org/10.5194/acp-17-8771-2017, 2017.
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Short summary
In this study, we find that SST increases of a specific ocean in the Northern Hemisphere tend to increase summertime surface O3 concentrations over upwind continents while reducing those over downwind regions. It also promotes a more stagnant climate, which tends to suppress O3 long-range transport. Our findings indicate a robust linkage between basin-scale SST variability and continental surface O3 pollution, which should be taken into account for air quality management.
In this study, we find that SST increases of a specific ocean in the Northern Hemisphere tend to...
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