1 / 86

Climatological UV Maps from EUVDB Measurements

Construct UV maps from EUVDB data to address uneven distribution of ground-based stations. Combine GB data with satellite estimates for a solution. Explore constant differences between satellite and GB UV measurements.

sarahw
Download Presentation

Climatological UV Maps from EUVDB Measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DAILY MAPS OF UV ERYTHEMA FROM EUVDB MEASUREMENTS A. Bais, A. Kazantzidis, K. Tourpali Aristotle University of Thessaloniki Laboratory of Atmospheric Physics EDUCE meeting Saariselka, FI

  2. The Objective:To construct climatological UV maps from EUVDB data • The problem: Ground based stations are few and unevenly distributed EDUCE meeting Saariselka, FI

  3. EDUCE meeting Saariselka, FI

  4. The Objective:To construct climatological UV maps from EUVDB data • The problem: Ground based stations are few and unevenly distributed • A possible solution: Combine UV maps from GB data with satellite UV estimates • Problem: Satellite daily UV is different from daily UV derived from GB stations • Question: Is this difference constant? EDUCE meeting Saariselka, FI

  5. Calculation of monthly mean if more than 19 days with measurements are available CIE erythema (UVery) at the ground at each station from SHICRIVM (provided by RIVM) Daily CIE erythema at the ground at each station 10-day averages of CIE erythema at the ground Monthly means of CIE erythema at the ground DAILY CIE ERYTHEMA AT EACH GROUND STATION UVery = 0 at sunrise and sunset Computation of daily integral if time gap between successive measurements is less than 2.5 h Calculation of 10-day averages if more than 5 days with measurements are available EDUCE meeting Saariselka, FI

  6. THESSALONIKI KNMI DE BILT Daily CIE erythema (J m-2) 5 5 0 0 5 0 0 0 4 5 0 0 JOKIOINEN ) 2 4 0 0 0 - m . J ( 3 5 0 0 A M E H 3 0 0 0 T Y R 2 5 0 0 E E I C 2 0 0 0 Y L I A 1 5 0 0 D 1 0 0 0 5 0 0 0 3 0 6 0 9 0 1 2 0 1 5 0 1 8 0 2 1 0 2 4 0 2 7 0 3 0 0 3 3 0 3 6 0 DAY OF YEAR 1998 EDUCE meeting Saariselka, FI

  7. 5 5 0 0 5 0 0 0 THESSALONIKI KNMI DE BILT - 4 5 0 0 JOKIOINEN 4 0 0 0 3 5 0 0 3 0 0 0 2 5 0 0 2 0 0 0 1 5 0 0 1 0 0 0 5 0 0 0 3 6 9 1 2 1 5 1 8 2 1 2 4 2 7 3 0 3 3 3 6 T E N D A Y S O F Y E A R 1 9 9 8 10-DAY averages of CIE erythema (J m-2) EDUCE meeting Saariselka, FI

  8. 5 5 0 0 THESSALONIKI 5 0 0 0 ) KNMI DE BILT 2 - m 4 5 0 0 . JOKIOINEN J ( A 4 0 0 0 M E H 3 5 0 0 T Y R E 3 0 0 0 E I C 2 5 0 0 N A E 2 0 0 0 M Y L 1 5 0 0 H T N O 1 0 0 0 M 5 0 0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 Monthly means of CIE erythema (J m-2) MONTH OF YEAR 1998 EDUCE meeting Saariselka, FI

  9. Tropospheric Ultraviolet-Visible radiation model (TUV) version 4.0 RELATION OF CIE RATIO FOR CLOUDLESS AND CLOUDY DAYS TO CLOUD OPTICAL DEPTH Model input parameters: Tot. O3: 200-500 DU step 50 DU SZA: 10°-90° step 10° COD: 0-100 step 10 Cloud properties: ω = 0.99, g = 0.85 NO AEROSOLS Solar spectrum: Atlas-3 U.S. standard atmosphere Pseudospherical disort (6 streams) CIE for clear skies (CIEc) CIE for cloudy skies (CIEcld) COD = exp-4.4139 * (CIEcld/CIEc) * 119.683 for all ozone and SZA values EDUCE meeting Saariselka, FI

  10. 1 0 0 Y=exp(-4.4139*X)*119.683 8 0 H T P E D 6 0 L A C I T P O 4 0 D U O L C 2 0 0 0 . 0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 CIE (cloudy) / CIE (clear) EDUCE meeting Saariselka, FI

  11. Model calculation of UVery for each measurement time to derive daily integrals Using:TOMS total ozone, No aerosol Correction:for altitude, Sun-Earth distance Daily CIE erythema derived from measurements (CIEcld ) Computation of monthly mean values of COD if at least 20 days in a month are available CIE erythema from TUV for cloudless skies Monthly mean cloud optical depth MODEL DERIVED CLOUD OPTICAL DEPTH AT EACH STATION Daily CIE erythema at the ground for cloudless skies (CIEc) Daily cloud optical depth (COD) derived from CIEcld / CIEc ratio EDUCE meeting Saariselka, FI

  12. Monthly mean cloud optical depth (COD) TOMS UV CORRECTION FACTOR AS A FUNCTION OF COD Calculation of ratios TOMS correction factor RTG = 0.0123186 * COD + 1.06639 EDUCE meeting Saariselka, FI

  13. 2 . 0 1 . 8 a m 1 . 6 e h t y r e E I 1 . 4 C d e s a b d 1 . 2 n u o r g / s m 1 . 0 o t 0 . 8 Y=0.0123186 * X + 1.06639 R-squared = 0.23 0 . 6 0 5 1 0 1 5 2 0 2 5 3 0 3 5 cloud optical depth RTG EDUCE meeting Saariselka, FI

  14. RTG EDUCE meeting Saariselka, FI

  15. MAPS OF MONTHLY CIE ERYTHEMA OVER EUROPE CIE erythema from TUV for cloudless skies Daily integrals of CIE from UVery calculated at 1-hour steps for the 15th of each month Using:TOMS total ozone, No aerosol Correction:for altitude, Sun-Earth distance Monthly mean CIE erythema at the ground for cloudless skies (CIEMODEL) Monthly mean CIE erythema at the ground from TOMS Monthly mean COD derived from CIETOMS/CIEMODEL and application of correction factor to CIETOMS Combine TOMS with Ground derived CIE erythema at grids with correlation higher than 0.7 CIE = CIEGROUND * R + CIETOMS * (1-R) MONTHLY CIE ERYTHEMA MAP EDUCE meeting Saariselka, FI

  16. EDUCE meeting Saariselka, FI

  17. EDUCE meeting Saariselka, FI

  18. EDUCE meeting Saariselka, FI

  19. EDUCE meeting Saariselka, FI

  20. EDUCE meeting Saariselka, FI

  21. Comparison of TOMS/model derived CODwith COD from ISCCP AUGUST 1996 EDUCE meeting Saariselka, FI

  22. EDUCE meeting Saariselka, FI

  23. EDUCE meeting Saariselka, FI

  24. EDUCE meeting Saariselka, FI

  25. EDUCE meeting Saariselka, FI

  26. EDUCE meeting Saariselka, FI

  27. EDUCE meeting Saariselka, FI

  28. EDUCE meeting Saariselka, FI

  29. EDUCE meeting Saariselka, FI

  30. EDUCE meeting Saariselka, FI

  31. EDUCE meeting Saariselka, FI

  32. EDUCE meeting Saariselka, FI

  33. EDUCE meeting Saariselka, FI

  34. EDUCE meeting Saariselka, FI

  35. EDUCE meeting Saariselka, FI

  36. EDUCE meeting Saariselka, FI

  37. EDUCE meeting Saariselka, FI

  38. EDUCE meeting Saariselka, FI

  39. EDUCE meeting Saariselka, FI

  40. EDUCE meeting Saariselka, FI

  41. EDUCE meeting Saariselka, FI

  42. EDUCE meeting Saariselka, FI

  43. EDUCE meeting Saariselka, FI

  44. EDUCE meeting Saariselka, FI

  45. EDUCE meeting Saariselka, FI

  46. EDUCE meeting Saariselka, FI

  47. EDUCE meeting Saariselka, FI

  48. EDUCE meeting Saariselka, FI

  49. EDUCE meeting Saariselka, FI

  50. EDUCE meeting Saariselka, FI

More Related