POllution: MODeling and ObseRvatiOns



The IMK team will analyse limb emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat [Fischer et al., 2008] with respect to atmospheric pollutants in the upper troposphere and lower stratosphere. The following aspects will be covered:

  1. Creation of global fields of O3, CO, C2H6, C2H2, HNO3, HNO4, PAN, HCN and H2CO and others (NH3, formic acid, methanol, acetone, OCS, CH3CN, ... retrieval to be developed) in the UTLS for dedicated episodes.
  2. Search for new species in MIPAS spectra using new spectroscopic data provided by LISA.
  3. Development of the "chemical fingerprint method" to distinguish different sources of pollution.
  4. Identification of troposphere-to-stratosphere transport from the observational data.
Global HCN distribution at 12 km altitude derived from MIPAS measurements between 9 September and 30 November 2003. The distribution reflects the southern hemispheric biomass burning plume extending from Brasil over Southern Africa and Australia into the Southern Pacific.


The LISA team will give the following scientific contributions:

  1. IASI data:
  2. Update of the spectroscopic parameters: Identification and removal of deficiencies in the spectroscopic data of minor atmospheric pollutants measured by MIPAS. Supply of spectroscopic parameters for additional atmospheric pollutants.

Ozone pollution event measured with IASI (0-6 km partial tropospheric columns) on July 17, 2007 during the heat wave period that occurred in Central Europe in 2007. Cloudy pixels are shown in grey.

Retrieval of global upper tropospheric and stratospheric formaldehyde (H2CO) distributions from MIPAS-Envisat spectra [Steck et al., 2008], using new spectroscopic H2CO data provided by LISA. Top: Simulated spectrum at 16.4 km tangent altitude; tropical conditions, all gases included. Bottom: Formaldehyde contribution only (note the different scale).


The team of the Laboratoire d'Aérologie will use 3-D fields of chemical constituents to assess the impact of tropical biomass burning up to the lower stratosphere. Main topics:

  1. Emission and transport of pollutants in the lower troposphere: Systematic comparisons between satellite data sets (MIPAS, IASI etc.) and MOCAGE simulations based on state-of-the-art inventories.
  2. Dynamical and chemical processing of polluted airmasses up to the upper troposphere: Detailed investigation of the composition of upper tropospheric plumes based upon satellite measurements and model as well as assimilation output.
  3. Global-scale transport processes up to the lower stratosphere: Use of MOCAGE to investigate the transport from the upper troposphere (UT) into the lower stratosphere (LS).


The research team of the MPI-Ch / University of Mainz will perform model simulations of the impact of anthropogenic pollution on the chemical composition of the extratropical troposphere and lower stratosphere with the atmospheric chemistry GCM ECHAM5/MESSy [Jöckel et al., 2006]. The following tasks will be addressed:

  1. Quantification of the importance of the different biomass burning source regions for the global ozone budget and the extratropical UTLS
  2. Investigation of the effect of different sources of pollution on the European air quality
  3. Case studies:
  4. Transport pathways for pollution in the extratropics