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Title: A single-point modeling approach for the intercomparison and evaluation of ozone dry deposition across chemical transport models (Activity 2 of AQMEII4)

Journal Article · · Atmospheric Chemistry and Physics (Online)
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5];  [3]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8];  [9];  [10]; ORCiD logo [8]; ORCiD logo [11];  [12]; ORCiD logo [13];  [14];  [4]; ORCiD logo [15] more »;  [8]; ORCiD logo [16];  [17];  [2];  [18];  [17];  [19];  [4];  [20]; ORCiD logo [20]; ORCiD logo [14];  [15];  [21]; ORCiD logo [22]; ORCiD logo [4] « less
  1. NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States); Columbia Univ., New York, NY (United States)
  2. US Environmental Protection Agency (EPA), Research Triangle Park, NC (United States)
  3. Univ. of York (United Kingdom)
  4. Environment and Climate Change Canada, Toronto, ON (Canada)
  5. United Kingdom Centre for Ecology and Hydrology (United Kingdom); James Hutton Institute (United Kingdom)
  6. European Centre for Medium-Range Weather Forecasts, Reading (United Kingdom)
  7. Jerusalem College of Technology (Israel)
  8. European Commission (Italy). Joint Research Centre (JRC)
  9. Wageningen Univ. (Netherlands)
  10. European Commission (Italy). Joint Research Centre (JRC); Scottish Universities Environmental Research Centre (SUERC), East Kilbride (United Kingdom)
  11. Florida State Univ., Tallahassee, FL (United States)
  12. Univ. of Szeged (Hungary)
  13. Royal Netherlands Meteorological Institute (KNMI), De Bilt (Netherlands)
  14. Hebrew Univ. of Jerusalem (Israel)
  15. Univ. of Helsinki (Finland)
  16. Harvard Univ., Cambridge, MA (United States)
  17. Technical University of Madrid (Spain)
  18. US Dept. of Agriculture (USDA), Greensboro, NC (United States)
  19. Univ. of Southern California, Los Angeles, CA (United States)
  20. The Chinese University of Hong Kong (Hong Kong)
  21. Eotvos Lorand University, Budapest (Hungary)
  22. US Environmental Protection Agency (EPA), Research Triangle Park, NC (United States); RTI International, Research Triangle Park, NC (United States)

A primary sink of air pollutants and their precursors is dry deposition. Dry deposition estimates differ across chemical transport models, yet an understanding of the model spread is incomplete. Here, we introduce Activity 2 of the Air Quality Model Evaluation International Initiative Phase 4 (AQMEII4). We examine 18 dry deposition schemes from regional and global chemical transport models as well as standalone models used for impact assessments or process understanding. We configure the schemes as single-point models at eight Northern Hemisphere locations with observed ozone fluxes. Single-point models are driven by a common set of site-specific meteorological and environmental conditions. Five of eight sites have at least 3 years and up to 12 years of ozone fluxes. The interquartile range across models in multiyear mean ozone deposition velocities ranges from a factor of 1.2 to 1.9 annually across sites and tends to be highest during winter compared with summer. No model is within 50 % of observed multiyear averages across all sites and seasons, but some models perform well for some sites and seasons. For the first time, we demonstrate how contributions from depositional pathways vary across models. Models can disagree with respect to relative contributions from the pathways, even when they predict similar deposition velocities, or agree with respect to the relative contributions but predict different deposition velocities. Both stomatal and nonstomatal uptake contribute to the large model spread across sites. Our findings are the beginning of results from AQMEII4 Activity 2, which brings scientists who model air quality and dry deposition together with scientists who measure ozone fluxes to evaluate and improve dry deposition schemes in the chemical transport models used for research, planning, and regulatory purposes.

Research Organization:
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-06OR23100
OSTI ID:
2424085
Journal Information:
Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Journal Issue: 17 Vol. 23; ISSN 1680-7324
Publisher:
Copernicus Publications, EGUCopyright Statement
Country of Publication:
United States
Language:
English

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