A substantial portion of tropospheric O3 dry deposition occurs after diffusion of O3 through plant stomata. Simulating stomatal regulation in 3-D atmospheric chemistry models is important in the face of increasing drought induced declines in stomatal conductance and enhanced ambient O3. Here, we present an intercomparison of the stomatal component of O3 dry deposition (egs) from chemical transport models and estimates of egs from observed CO2, latent heat, and O3 flux. The dry deposition schemes were configured as single point models forced with data collected at flux towers. We use sensitivity analysis to study the impact of model parameters that control stomatal moisture stress on modeled egs. Examining six sites around the northern hemisphere, we find that the seasonality of observed flux-based egs agrees with the seasonality of single point modeled egs at times during the growing season with disagreements occurring during the later part of the growing season at some sites. We find that modeled water stress effects are too strong in a northern forest. Some single point models overestimate summertime egs in a seasonally water limited Mediterranean shrubland. At all sites examined, modeled egs was sensitive to parameters that control the vapor pressure deficit stress. At specific sites that experienced substantial declines in
soil moisture, the simulation of egs was highly sensitive to parameters that control the soil moisture stress. The findings imply that simulating stomatal moisture stress can overestimate or underestimate the stomatal sink of O3 during observed increases in dryness depending on ecosystem specific plant-resource interactions
KHAN Anam M.;
CLIFTON Olivia;
BASH Jesse O.;
BLAND Sam;
BOOTH Nathan;
CHEUNG P;
EMBERSON Lisa;
FLEMMING Johannes;
FREDJ Erick;
GALMARINI Stefano;
GANZEVELD Laurens;
GAZETAS Orestis;
GODED BALLARIN Ignacio;
HOGREFE Christian;
HOLMES Christofer;
HORVÁTH L.;
HUIJNEN Vincent;
LI Qian;
MAKAR Paul;
MAMMARELLA Ivan;
MANCA Giovanni;
MUNGER J. William;
PEREZ-CAMANYO Juan Luis;
PLEIM Jonathan;
RAN Limei;
SAN JOSE Roberto;
SCHWEDE Donna;
SILVA Sam J;
STAEBLER Ralf;
SUN Shihan;
TAI Amos;
TAS Eran;
VESALA Timo;
WEIDINGER Tamas;
WU Zhiyong;
ZHANG Leiming;
STOY Paul;
2026-06-16
COPERNICUS GESELLSCHAFT MBH
JRC138895
1680-7324 (online),
https://acp.copernicus.org/articles/25/8613/2025/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC138895,
10.5194/acp-25-8613-2025 (online),
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