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Harmonisation of stratospheric NO 2 /O 3 column data products

Harmonisation of stratospheric NO 2 /O 3 column data products. F. Hendrick and M. Van Roozendael. Belgian Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium. + NDACC UV-VIS Working Group. NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 1. Context.

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Harmonisation of stratospheric NO 2 /O 3 column data products

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  1. Harmonisation of stratospheric NO2/O3 column data products F. Hendrick and M. Van Roozendael Belgian Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium + NDACC UV-VIS Working Group NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 1

  2. Context • NDACC UV-vis Working Group meeting at British Antarctic Survey in November 2007: • « There is a need to harmonize stratospheric O3 and NO2 column retrievals » • Main reasons: • Lack of consistency between the stations due to the use of different DOAS settings (e.g., NO2 XS at different temperature) and AMFs • Satellite groups encountered problems in the validation of their data using the NDACC UV-vis database, e.g. Wetzel et al., ACP, 2007 for the validation of MIPAS NO2 NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 2

  3. Harmonisation of O3 column retrieval: 1. DOAS settings NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 3

  4. Harmonisation of O3 column retrieval: 2. O3 AMF look-up tables • TOMS V8 (TV8) ozone and temperature profile climatology (Bhartia, 2004; McPeters et al., 2007) + total O3 column dependence • LUTs, AMF extraction routine as well as DOAS settings publicly available at: http://uv-vis.aeronomie.be/groundbased NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 4

  5. V1 V2 Corr temp Validation of new retrieval settings Comparison to: Dobson at OHP (44°N, 5.5°E) Brewer at Sodankyla (67°N, 27°E) Amplitude of Dobson-SAOZ seasonal variation: V1 6.9% SAOZ Yearly AMF V2 3.2% SAOZ LUT AMF Bias / Std Dev after temperature correction: -1.2% ± 3.7% Amplitude of Brewer-SAOZ seasonal variation: V1 6.5% SAOZ Yearly AMF V2 2.4% SAOZ LUT AMF Bias / Std Dev after temperature correction: 1.9% ± 3.2% NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 5

  6. Impact on the difference satellites - SAOZ V1 Yearly AMF V2 LUT AMF • Reduced amplitude of seasonal variation • Reduced bias More details on the recommendation and comparison studies in Hendrick et al., ACP, 2011 NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 6

  7. Harmonisation of NO2 column retrieval: 1. DOAS settings NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 7

  8. Harmonisation of NO2 column retrieval: 2. Stratospheric NO2 AMF LUTs Lambert et al.’s climatology consists of a Fourier harmonic decomposition of UARS HALOE v19 and SPOT-4 POAM-III v2 NO2 profile data records. • LUTs, AMF extraction routine as well as DOAS settings publicly available at: http://uv-vis.aeronomie.be/groundbased NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 8

  9. NO2 questionnaire (1) NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 9

  10. NO2 questionnaire (2) NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 10

  11. 0 0 -5% -5% -10% -10% Impact of aerosols NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 11

  12. GOME-2 - SAOZ SCIAMACHY-SAOZ GOME-SAOZ OMI-SAOZ Satellites (TEMIS) - SAOZ NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 12

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