Constraints on Asian ozone using Aura TES, OMI and Terra MOPITT Journal Article uri icon

Overview

abstract

  • Rapid industrialization in Asia in the last two decades has resulted in a significant increase in Asian ozone (O<sub>3</sub>) pre-cursor emissions with likely a corresponding increase in the export of O<sub>3</sub> and its pre-cursors. However, the relationship between this increasing O<sub>3</sub>, the chemical environment, O<sub>3</sub> production efficiency, and the partitioning between anthropogenic and natural precursors is unclear. In this work, we use satellite measurements of O<sub>3</sub>, CO and NO<sub>2</sub> from TES (Tropospheric Emission Spectrometer), MOPITT (Measurement of Pollution In The Troposphere) and OMI (Ozone Monitoring Instrument) to quantify O<sub>3</sub> pre-cursor emissions for 2006 and their impact on free-tropospheric O<sub>3</sub> over North-East Asia, where pollution is typically exported globally due to strong westerlies. Using the GEOS-Chem global chemical transport model, we show that the modeled seasonal variation of O<sub>3</sub> based on these updated O<sub>3</sub> pre-cursor emissions is consistent with the observed O<sub>3</sub> variability and amount, after accounting for known biases in the TES O<sub>3</sub> data. Using the adjoint of GEOS-Chem we then partition the relative contributions of natural and anthropogenic sources to free troposphere O<sub>3</sub> in this region. We find that the influence of lightning NO<sub>x</sub> is important in summer. The contribution from anthropogenic NO<sub>x</sub> is dominant in other seasons. China is the major contributor of anthropogenic VOCs (Volatile Organic Compounds), whereas the influence of biogenic VOCs is mainly from Southeast Asia. Our result shows that the influence of India and Southeast Asia emissions on O<sub>3</sub> pollution export is significant, comparable with Chinese emisisons in winter and about 50% of Chinese emissions in other seasons.

publication date

  • July 29, 2014

Full Author List

  • Jiang Z; Worden JR; Jones DBA; Lin JT; Verstraeten WW; Henze DK

Other Profiles

Additional Document Info

start page

  • 19515

end page

  • 19544

volume

  • 14

issue

  • 13