Controls over ozone deposition to a high elevation subalpine forest

摘要: Ecosystem level ozone (O3) fluxes during four different years were examined at a subalpine forest site in the Colorado Rocky Mountains. The local mountain–valley wind system and proximity of Denver Metropolitan area leads to high summertime episodes on many afternoons. timing between these ecosystem processes controlling photosynthesis growing season plays critical role determining amount deposition. Light vapor pressure deficit (VPD) most dominant environmental drivers deposition O3 this through their influence stomatal conductance. 81% daytime uptake was predicted occur stomata. Stomatal decreased VPD temperatures leading an overall decrease flux; however, we did observe non-stomatal conductance for that increased slightly with temperature before leveling off higher values. During season, enhanced after midday precipitation events continued elevated levels throughout following night, implying surface wetness. From nighttime data, evidence both presence water films needles non-closure plant stomata observed. winter (nongrowing) velocity showed consistent dependency latent heat flux. Although mechanism is unclear, it apparent play here