Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1001
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 Dec 2016
Review status
A revision of this discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Response of Global Surface Ozone Distribution to Northern Hemispheric Sea Surface Temperature Changes: Implication for Long-Range Transport
Kan Yi1, Junfeng Liu1, George Ban-Weiss2, Jiachen Zhang2, Wei Tao1, 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, USA
Abstract. The response of surface O3 concentrations to basin-scale warming and cooling of Northern Hemispheric oceans is investigated using the Community Earth System Model (CESM). Idealized spatially uniform sea surface temperature (SST) anomalies of ±1 ºC are superimposed onto the North Pacific, North Atlantic, and North Indian oceans, individually. Our simulations suggest seasonal and regional variability of surface O3 in response to SST anomalies, especially in boreal summer. Increasing (decreasing) SST by 1 ºC in one of the regions of focus induces decreases (increases) in surface O3 concentrations, ranging from 1 to 5 ppbv. With fixed emissions, SST increases of a specific ocean in the Northern Hemisphere tend to increase summertime surface O3 concentrations over upwind continents, accompanied with a widespread reduction over downwind regions. We implement the integrated process analysis (IPR) 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 boreal summer, basin-scale SST warming facilitates vertical transport of O3 to the surface over upwind regions while significantly reducing vertical transport over continents that are downwind. This process, as confirmed by tagged CO tracers, implicates a considerable suppression of O3 intercontinental transport due to increased stagnation at mid-latitudes induced by SST increases. Changes in O3 chemical production associated with regional SST increases, on the other hand, can increase surface O3 over highly polluted continents except for South Asia. In South Asia, intensified cloud loading in response to North Indian SST warming depresses both surface air temperature and solar radiation, and thus photochemical production of O3. Our findings indicate a robust linkage between basin-scale SST variability and continental surface O3 pollution, which should be taken into account for regional air quality management.

Citation: Yi, K., Liu, J., Ban-Weiss, G., Zhang, J., Tao, W., and Tao, S.: Response of Global Surface Ozone Distribution to Northern Hemispheric Sea Surface Temperature Changes: Implication for Long-Range Transport, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1001, in review, 2016.
Kan Yi et al.
Kan Yi et al.
Kan Yi et al.

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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 reduces that over downwind regions. It also promote 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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