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Influence of Dynamic Ozone Dry Deposition on Ozone Pollution

Artikel i vetenskaplig tidskrift
Författare O. E. Clifton
F. Paulot
A. M. Fiore
L. W. Horowitz
G. Correa
C. B. Baublitz
S. Fares
I. Goded
A. H. Goldstein
C. Gruening
A. J. Hogg
B. Loubet
I. Mammarella
J. W. Munger
L. Neil
P. Stella
Johan Uddling
T. Vesala
E. Weng
Publicerad i Journal of Geophysical Research-Atmospheres
Volym 125
Nummer/häfte 8
ISSN 2169-897X
Publiceringsår 2020
Publicerad vid Institutionen för biologi och miljövetenskap
Språk en
Länkar dx.doi.org/10.1029/2020jd032398
Ämnesord dry deposition, tropospheric ozone, stomatal conductance, earth system, modeling, nonstomatal deposition, air pollution, surface ozone, air-quality, stomatal conductance, atmospheric chemistry, tropospheric ozone, deciduous forest, soil-moisture, land-cover, model, fluxes, Meteorology & Atmospheric Sciences
Ämneskategorier Meteorologi och atmosfärforskning

Sammanfattning

Identifying the contributions of chemistry and transport to observed ozone pollution using regional-to-global models relies on accurate representation of ozone dry deposition. We use a recently developed configuration of the NOAA GFDL chemistry-climate model - in which the atmosphere and land are coupled through dry deposition-to investigate the influence of ozone dry deposition on ozone pollution over northern midlatitudes. In our model, deposition pathways are tied to dynamic terrestrial processes, such as photosynthesis and water cycling through the canopy and soil. Small increases in winter deposition due to more process-based representation of snow and deposition to surfaces reduce hemispheric-scale ozone throughout the lower troposphere by 5-12 ppb, improving agreement with observations relative to a simulation with the standard configuration for ozone dry deposition. Declining snow cover by the end of the 21st-century tempers the previously identified influence of rising methane on winter ozone. Dynamic dry deposition changes summer surface ozone by -4 to +7 ppb. While previous studies emphasize the importance of uptake by plant stomata, new diagnostic tracking of depositional pathways reveals a widespread impact of nonstomatal deposition on ozone pollution. Daily variability in both stomatal and nonstomatal deposition contribute to daily variability in ozone pollution. Twenty-first century changes in summer deposition result from a balance among changes in individual pathways, reflecting differing responses to both high carbon dioxide (through plant physiology versus biomass accumulation) and water availability. Our findings highlight a need for constraints on the processes driving ozone dry deposition to test representation in regional-to-global models.

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