报告题目: The role of climate variability on surface ozone means and extremes

　　报 告 人: Meiyun Lin, Ph.D.

　　单 位: Princeton University & NOAA GFDL

　　时 间: 2016年1月21日（周四）上午10:30

　　地 点: LAPC铁塔分部多功能厅会议室

　　Abstract: Understanding the factors controlling year-to-year variability and long-term changes of regional air quality and extremes is crucial to developing forecasting capabilities and designing effective control measures. Meteorological conditions and extreme weather events can play an essential role in the deterioration of regional air quality. Using western North America as an example, I will present how climate variability (e.g., ENSO, PDO, and PNA) modulates near-surface ozone means and extremes via large-scale pollution transport [Lin et al., Nature Geoscience, 2014] and intrusions of stratospheric ozone deep into the troposphere [Lin et al., Nature Communications, 2015]. The presence of internal climate variability can pose a challenge to the detection of ozone trends from short (and sparse) observational records and the attribution of these changes to anthropogenic emission trends [Lin et al., 2015, GRL]. I will also discuss the implications of these results for understanding air quality in China.