식물 생태계가 대기 중 오존농도에 미치는 영향

Abstract

The Impact of Terrestrial Vegetation on Tropospheric O3：The Climate Implication Widely distributed terrestrial vegetation emits far more VOCs than anthropogenic emissions. The photo-reactivity of biogenic VOCs influences the oxidizing power of troposphere by changing OH or O3 concentration. This work compared the modeled (GEOS-Chem (Chemical Transport Model) driven) formaldehyde column, the most important oxidation intermediates from isoprene, with GOME formaldehyde column measurements. In addition, the contributions of emissions from CH4, isoprene, and biomass burning & biofuel to the HCHO column concentration are estimated. The natural region of higher HCHO column concentration mostly is attributed to the isoprene emissions with higher temperature and light intensity from the vegetation. We calculated that a 50% increase of global isoprene decreases global tropospheric OH by ~11%. However, the impact on tropospheric O3 is smaller; only ~1.5% enhancement due to the complex influence of reduced NOx concentration (Shim et al., 2005). 11% reduction of OH by ~190 Tg/yr enhanced isoprene emissions affects the lifetime of greenhouse gases, such as CH4. Accordingly, the effect of changes in isoprene emission due to global warming also involves complex feedbacks to climate change.