On the capabilities and limitations of GCCM simulations of summertime regional air quality: A diagnostic analysis of ozone and temperature simulations in the US using CESM CAM-Chem

摘要: Abstract We conduct a diagnostic analysis of ozone chemistry simulated by four different configurations Global Climate-Chemistry Model (GCCM), the Community Earth System (CESM) with detailed tropospheric chemistry. The purpose this study is to evaluate ability GCCMs simulate future evaluating their present-day To address we chose CESM that differ in meteorology (analyzed versus meteorological fields), number vertical levels, and coupling ice ocean models. apply mixed model statistics these against CASTNET observations within regions US using various performance metrics relevant changes. These include: mean biases interannual variability, response emission changes, temperature changes extreme values. Using metrics, find although configuration analyzed best simulates temperatures it does not outperform other metrics. All are unable capture observed decreases north-south gradient over eastern during 1995–2005. 56 levels markedly better capturing ozone-temperature relationships values than identical except contains 26 levels. recommend caution use simulating surface as differences variety parameters have significant impact on resulting chemical climate variables. Isoprene emissions depend strongly dependent isoprene but also cloud cover, photolysis, choice meteorology. dependencies must be accounted for interpretation GCCM results.