WP1. Emissions of tropospheric ozone precursors (TMOD)

  • T0→T0+6
    • Bottom-up inventory of isoprene emissions 1979-2012 and analysis of interannual variability
    • Comparison of the bottom-up isoprene fluxes with top-down emissions from a multi-year inversion using GOME-2 HCHO columns
    • Comparison of  model glyoxal columns with GOME-2/OMI datasets of glyoxal columns
  • T0+6→T0+12
    • Quantification of agricultural waste burning emissions in China through 2007-2012 using GOME-2 HCHO columns, as well as their effect on surface ozone and air quality
  • T0+12→T0+18
    • Focusing over Siberia, study of the interannual variability of satellite HCHO column data over the last decade and its relationship to the climate variability
    • Derivation of glyoxal sources through an inversion scheme using HCHO and CHOCHO data
  • T0+18→T0+24
    • Use of previous work on NOx sink uncertainties, and compilation of  GOME-2/OMI dataset of monthly NO2 tropospheric columns.
    • Inversion of NOx data to constrain NOx emissions over regions bearing strong human activity.

WP2. Recent trend in stratospheric chlorine (ULg, SMOD)

  • T0→T0+6
    • Establish the trend of HCl at a suite of NDACC sites for the post-1997 time period, using FTIR and satellite data
    • Compare the observational time series with model simulations (e.g. SLIMCAT, KASIMA, BASCOE)
  • T0+6→T0+12
    • Perform dedicated simulations (e.g. using updated emission scenario, other or fixed wind fields)
  • T0+12→T0+18
    • Draw conclusions as to the recent evolution of stratospheric HCl

WP3. Diurnal cycles (SYN, TMOD, SMOD, ULg)

  • T0→T0+6
    • Studies of the diurnal cycle of NO2 and HCHO (and more speculatively CHOCHO)
  • T0+6→T0+12
    • Mutual consistency of GOME-2A, GOME-2B and OMI in the light of diurnal cycles effects: first order
    • Studies of the diurnal cycle of stratospheric ozone and its impact on ECV production, validation and merging from different satellite data records
  • T0+12→T0+18
    • Studies of the diurnal cycle of NO2, HCHO and CHOCHO (continued)
  • T0+18→T0+24
    • Accuracy of GOME-2 retrievals, and mutual consistency of GOME-2A, GOME-2B and OMI in the light of diurnal cycles effects: multi-dimensional aspects using observation operators

WP4. Sulfur compounds (ULg, TMOD)

  • T0→T0+6
    • Improvement of the representation of SO2 sources and sinks in IMAGESv2
    • Finalization of the OCS retrieval strategy using Hitran 2008 or 2012. Production and analysis of the Jungfraujoch time series for the total, tropospheric and stratospheric columns
  • T0+6→T0+12
    • Comparison of simulated to observed SO2 satellite columns and compilation of aircraft and ground-based measurements of SO2
    • Test of the OCS retrieval strategy at other NDACC sites. Suggest adjustments if needed. 
  • T0+12→T0+18
    • Inversion of monthly SO2 satellite column observations from GOME-2/OMI
    • Analysis of results over major industrialized regions, including on SO2 lifetime  
    • Comparison of SO2 independent measurements with a priori and optimized model results
    • Comparison of retrieved OCS with ACE-FTS time series in both hemispheres, in the troposphere and stratosphere
  • T0+18→T0+24
    • Draw conclusions as to the recent evolution of atmospheric OCS

WP5. Reducing the model ozone deficit in the upper stratosphere/lower mesosphere (SMOD)

  • T0→T0+6
    • Getting GOME-2, ACE-FTS, SMR and OSIRIS data in the readable format of BASCOE
  • T0+6→T0+12       
    • BASCOE CTM simulation and comparison against GOME-2, ACE-FTS, SMR and OSIRIS for ozone and temperature
    • Implement temperature bias correction scheme in BASCOE
  • T0+12 → T0+T24
    • BASCOE sensitivity test on reaction rates and find key species
    • Implement new reactions in BASCOE (optional)
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