On the indicator-based approach to assess ozone sensitivities

摘要: Previous model studies suggested that ambient measurements of key chemical species and ratios could be used to assess the sensitivities ozone formation reductions in precursor emissions. Threshold values these indicator ratios, delineating transition between VOC NO x sensitivity, were proposed. Subsequently, measurement have assumed universality threshold criteria compared local observed indicators with previously established sensitivities. In this study concept is extended combinations observable are consistently associated different site characteristics (e.g., emissions features). The results SARMAP Air Quality Model (SAQM) simulations San Joaquin Valley, California, investigate applicability features use three (O/(NO -NO ), s  y HCHO/NOy, H202/HNO3) along SAQM-derived found effective for identifying VOC- or NOx-sensitive regimes. NOy (NOy-NOx)/NOy useful describing emission criteria/are derive'd by SAQII prediction. assessing differ from proposed previous using models under conditions. Such differences suggest likely dependent on locations environmental conditions, including patterns rates. Therefore can determine only if appropriate been derived