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Envisat Validation Workshop Atmospheric Chemistry Validation Team

Envisat Validation Workshop Atmospheric Chemistry Validation Team Ground-Based Measurements and Campaign Database Subgroup Comparisons with GOMOS air-density and Temperature Profiles. Stéphane Marchand, stephane.marchand@aerov.jussieu.fr.

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Envisat Validation Workshop Atmospheric Chemistry Validation Team

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  1. Envisat Validation Workshop Atmospheric Chemistry Validation Team Ground-Based Measurements and Campaign Database Subgroup Comparisons with GOMOS air-density and Temperature Profiles Stéphane Marchand, stephane.marchand@aerov.jussieu.fr Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 1

  2. Validation Team Projects involved : instruments : validate product: • AOID 153 S. Pal Toronto Lidar T (43.66°N, 79.4°W) • AOID 222 K. H. Fricke Esrange Lidar T, HRTP, density (67.9°N, 20.1°E) • AOID 300 D. De Muer Uccle radio-soundings T (50.8°N, 4.35°E) • AOID 360 P. Keckhut OHP Lidar HRTP (43.94°N, 5.71°E) • AOID 9100 F. Congeduti Rome lidar T (41.83°N, 12.65°E) Level 2 GOMOS : GOM_NL__2P* Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 2

  3. Intercomparison of air-density Profile AO 222 2002-08-15 Dist. : 184 km Orb . 2400 star ID : 155 Mv : 2.9 T : 6600 K . Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 3

  4. Intercomparison of air-density Profile AO 153 2002-07-25 Orb . 2091/2092 star ID : 18 Mv : T : 9700 K . Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 3

  5. Intercomparison of air-density Profile AO 153 2002-10-25 Orb . 3407 star ID : 84 Mv : T : 4500 K . Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 3

  6. Temperature Temperature = 2 products • (low resolution) Temperature : contribution of O2 band + rayleigh diffusion + atmospheric model ARLETTY (A. Hauchecorne SA/CNES) • High Resolution Temperature (HRTP) : scintillation obtained with photometers Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 4

  7. Intercomparison of (low resolution) Temperature AO153 2002-07-25 AO153 2002-10-25 Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 5

  8. Intercomparison of (low resolution) Temperature AO 222 2002-08-15 Dist. : 184 km Orb . 2400 star ID : 155 Mv : 2.9 T : 6600 K Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 6

  9. Intercomparison of (low resolution) Temperature Some statistical results AO 222 38 GOM_NL__2P* 18 lidar Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 7

  10. Intercomparison of (low resolution) Temperature AO 300 2002-10-01/2002-11-28 Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 8

  11. Intercomparison of (low resolution) Temperature AO 300 2002-10-01/2002-11-28 Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 9

  12. Intercomparison of (low resolution) Temperature Some statistical results AO 300 10 GOM_NL__2* 9 radio-soundings Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 10

  13. LIDAR RMRRome Tor Vergata Lidar site: 41.83°N, 12.65°E, 150 a.s.l Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 11

  14. Intercomparison of High Resolution Temperature Profile AO 222 4 GOM_NL__2P* star ID : 52 Mv : 2.04 T : 4500 K Star ID : 142 Mv : 2.85 T : 8900 K Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 12

  15. Intercomparison of High Resolution Temperature Profile AO 360 2002-04-25 star ID : 81 Mv : 2.36 T : 28000 K Dist. 300 km Time delay : few hours Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 13

  16. Conclusions • difference of performance between • dark/bright limb conditions • lack of knowledge of the model contribution • in these quantities • difficult to validate the HRTP • (reflection on the spatio-temporal differences) • no bias larger than 10% - good • bias lesser than 1% between 15-35 km • seems to be good but the validation must continue Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002 Page 14

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