O<sub>3</sub> variability in the troposphere as observed by IASI over 2008-2016: Contribution of atmospheric chemistry and dynamics

Catherine Wespes; Daniel Hurtmans; Cathy Clerbaux; Pierre-François Coheur

O₃ variability in the troposphere as observed by IASI over 2008-2016: Contribution of atmospheric chemistry and dynamics

Catherine Wespes ¹ Daniel Hurtmans ¹ Cathy Clerbaux ^{1, 2} Pierre-François Coheur ¹

1 Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique

2 TROPO - LATMOS

LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales

Abstract : We analyze the ozone (O₃) variability in the troposphere (from ground to 300 hPa) using eight years (January 2008 – March 2016) of O₃ profile measurements provided by the Infrared Atmospheric Sounding Interferometer (IASI) onboard the MetOp satellite. The capability of IASI to monitor the year-to-year variability in that layer is examined first in terms of vertical sensitivity, a priori contribution and correlations in the deseasonalized anomalies with the upper layers. We present global patterns of the main geophysical drivers (e.g. solar flux - SF, Quasi-Biennial Oscillations - QBO, North Atlantic Oscillation - NAO, El Niño/Southern Oscillation - ENSO) of IASI O₃ variations, obtained by applying appropriate annual and seasonal multivariate regression models on time series of spatially gridded averaged O₃. The results show that the models are able to explain most of the O₃ variability captured by IASI. Large O₃ changes in the North Arctic/Euro-Atlantic sector and over the equatorial band are attributed to the NAO and the QBO effects, respectively. ENSO is modeled as the main contributor to the O₃ variations in the tropical band where direct effects of warm and cool ENSO phases are highlighted with a clear tropical-extratropical gradient. A strong West-East gradient in the tropics is also found and likely reflects an indirect effect related to ENSO dry conditions. Finally, we also show that the ENSO perturbs the O₃ variability far from the tropics into mid- and high latitudes where a significant 4-month time-lag in the response of O₃ to ENSO is identified for the first time.

Keywords : IASI Tropospheric ozone

Document type :

Journal articles

Domain :

Physics [physics] / Physics [physics] / Atmospheric and Oceanic Physics [physics.ao-ph]

Sciences of the Universe [physics] / Ocean, Atmosphere

Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01451930
Contributor : Catherine Cardon <>
Submitted on : Wednesday, February 1, 2017 - 3:17:52 PM
Last modification on : Friday, July 26, 2019 - 1:28:04 PM

O₃ variability in the troposphere as observed by IASI over 2008-2016: Contribution of atmospheric chemistry and dynamics

Links full text

Identifiers

Collections

Citation

Export

Metrics

247

Contact

O3 variability in the troposphere as observed by IASI over 2008-2016: Contribution of atmospheric chemistry and dynamics

Links full text

Identifiers

Collections

Citation

Export

Share

Metrics

247

Contact

O₃ variability in the troposphere as observed by IASI over 2008-2016: Contribution of atmospheric chemistry and dynamics