Tropospheric Ozone from GOME_2 also in combination with other stratospheric ozone measurements

Transcription

1 Tropospheric Ozone from GOME_2 also in combination with other stratospheric ozone measurements Klaus-Peter Heue 1, Melanie Coldewey-Egbers 1, Andy Delcloo 2, Christophe Lerot 3, Diego Loyola 1, Pieter Valks 1, Michel van Roozendael 3,Nabiz Rahpoe 4 1 Institut für Methodik der Fernerkundung am Deutschen Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany 2 Institut Royal Météorologique / Koninklijk Meteorologisch Instituut, Brussels, Belgium 3 Koninklijk Belgisch Instituut voor Ruimte-Aeronomie / Institut royal d'aéronomie Spatiale de Belgique, Brussels, Belgium 4 Institut für Umweltphysik, Universität Bremen, Bremen, Germany

2 Overview Convective Cloud Differential (CCD) Trends in Tropical Tropospheric Ozone Columns Comparison of CCD and CMAM Combination of GOME2 and MLS Comparison to CCD (TTOC)

3 Cloud top height (Level 2 data) CCD method ~240 DU above cloud column ozone correction Stratospheric O 3 col ~240 DU Top of tropospheric column 10 km <2 DU ~ DU total column ozone Stratospheric O 3 col tropical troposphericcolumn ozone ~10-40 DU

4 CCD Details Algorithm is applied to GOME2 total ozone columns and cloud data DLR GDP 4.8 data sets / OCRA_ROCIN cloud data Tropospheric column up to 10 km (~280 hpa) Resolution 2.5 x 1.25 (long x lat) Monthly means Operational within the O 3 msaf project ( Validation see presentation by Delcloo A. et al. (Thursday 9:45 10:00)

5 Example map Tropospheric O 3 columns for May 2007 Tropospheric O 3 columns deviation for May 2007

6 Trends ESA CCI data from GOME, SCIA, OMI, GOME2A and GOME2B (GODFIT poster 223 Lerot et al.) Harmonized using SCIAMACHY as reference Timeseries 1995 to 2015 (~20 years) Fit linear function, sine, cosine, and indices for ENSO, QBO, solar flux Global tropical trend 0.7 ± 0.12 DU/decade Regional trends 5 x 5 averages (4 x 2 grid cells) Vary between -0.8 and 1.8 DU/decade Robust if larger than 2σ, marked with X Heue et al AMTD

7 Comparison to CMAM Canadian Centre for Climate Modelling and Analysis Canadian Middle Atmosphere Model Tropospheric ozone from Jan to Dec Comparison to TTOC from 1995 to 2010 (~15 years) Calculated tropical trend CMAM 0.7 DU / decade CCD 0.86 DU / decade regional trends (CMAM s resolution of 3.75 x 3.75 )

8 Comparison to CMAM

9 GOME2 total ozone combined with MLS stratospheric data GOME2 total ozone columns gridded to 2.5 x 2.5 daily MLS Data integrated between tropopause and 0.5 hpa Integrated MLS columns gridded to 2.5 x 2.5 daily linear interpolate along long./lat. Subtracted gridded daily datasets Calculated monthly mean 2.5 x 2.5 grid

10 GOME2 total ozone combined with MLS stratospheric data Tropospheric ozone for May 2007 (GOME_2-MLS) GOME2 total ozone columns gridded to 2.5 x 2.5 daily MLS Data integrated between tropopause and 0.5 hpa Integrated MLS columns gridded to 2.5 x 2.5 daily linear interpolate along long./lat. Subtracted gridded daily datasets Calculated monthly mean 2.5 x 2.5 grid Tropospheric O 3 columns deviation for May 2007

11 Comparison between GOME_2 CCD and GOME2-MLS Large Bias (9.4 DU) Related to different altitude ranges? CCD up to 10km (~280 hpa) GOME_2-MLS tropopause (~100 hpa)

12 Comparison between GOME_2 CCD and GOME2-MLS Large Bias (9.4 DU) Related to different altitude ranges? CCD up to 10km (~280 hpa) GOME_2-MLS tropopause (~100 hpa) Compare altitude independent average mixing ratio Up to now no stratospheric harmonisation between CCD and MLS was performed

13 Outlook Future work focussing on the CCD data: Finalize publication (Discussion on AMTD is closed) Update data with future OMI, GOME-2A, GOME-2B data Include S5P data as soon as available In S5P tropical tropospheric ozone (CCD) is operational Future work focussing on the GOME2-MLS data: Run algorithm on complete GOME2A dataset (currently only 2007) Compare to OMI-MLS Validate with ozone sondes Compare to model e.g. CMAM