Weidong Chen
Université du Littoral Côte d’Opale, France
Title: Advanced photonic technologies for atmospheric measurements
Biography
Biography: Weidong Chen
Abstract
Chemically reactive atmospheric species play a crucial role in tropospheric processes that dominate regional air quality and global climate change. Contrary to long-lived species (such as greenhouse gases), real time in situ sensing of short-lived atmospheric molecules represents a real challenge due to their very high reactivity resulting in short lifetimes (of around 1-100 seconds) and ultra-low concentrations that measure in parts per billion by volume (PPBV) to parts per quadrillion by volume (ppqv). In this talk, we will overview our recent progress in the development of photonic instruments for in situ monitoring of such atmospheric species (like nitrous acid (HONO), nitrate radical (NO3), nitrogen dioxide (NO2). The experimental arrangements, based on the advanced photonic technologies (such as quantum cascade laser, light emitting diode) combined with selective and sensitive long optical path length enhanced absorption spectroscopy, as well as their applications to field observation and smog chamber study will be presented.
