envisat validation workshop atmospheric chemistry validation team ground-based measurements and...
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Envisat Validation Workshop
Atmospheric Chemistry Validation Team
Ground-Based Measurements and Campaign Database Subgroup
Comparisons with GOMOS air-density and Temperature Profiles
Stéphane Marchand, [email protected]
Page 1Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Validation Team
Projects involved : instruments : validateproduct: 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*
Page 2Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Page 3Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of air-density Profile
AO 222 2002-08-15
Dist. : 184 kmOrb . 2400
star ID : 155Mv : 2.9T : 6600 K
.
Page 3Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of air-density Profile
AO 153 2002-07-25Orb . 2091/2092
star ID : 18Mv :T : 9700 K
.
1.0E+15 1.0E+16 1.0E+17 1.0E+18 1.0E+19 1.0E+20Air Density (cm-3)
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
55000
60000
65000
70000
Altit
ude
(m)
Orbit 2091
Lidar (250702)
Orbit 2092
Page 3Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of air-density Profile
AO 153 2002-10-25Orb . 3407
star ID : 84Mv :T : 4500 K
.
1.0E+15 1.0E+16 1.0E+17 1.0E+18 1.0E+19 1.0E+20Air Density (cm-3)
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
55000
60000
65000
70000
Altit
ude
(m)
Orbit 3407
Lidar (250702)
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
Page 4Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of (low resolution) Temperature
Page 5Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
200 210 220 230 240 250 260 270 280 290 300Tem perature (K)
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
55000
60000
Alt
itu
de
(m)
Orb 2091Orb 2092
Lidar (250702)
Tropopause Height ( NCEP: 14070m , 213.3K)
Tropopause Height (GOMOS: 17357m , 221.1K)Tropopause Height (GOMOS: 17250m , 216.9K)
GOM OS-Toronto Lidar
200 210 220 230 240 250 260 270 280 290 300Tem perature (K)
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
55000
60000
Alt
itu
de
(m)
Orb 3407
Lidar (251002)
Tropopause Height ( NCEP: 20216m , 210.7K)
Tropopause Height (GOMOS: 22160m , 212.6K)
GOM OS-Toronto Lidar
AO1532002-07-25
AO1532002-10-25
Intercomparison of (low resolution) Temperature
Page 6Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 222 2002-08-15
Dist. : 184 kmOrb . 2400
star ID : 155Mv : 2.9T : 6600 K
Page 7Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of (low resolution) Temperature
Some statistical results
AO 222
38 GOM_NL__2P*18 lidar
Intercomparison of (low resolution) Temperature
Page 8Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 300 2002-10-01/2002-11-28
Intercomparison of (low resolution) Temperature
Page 9Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 300 2002-10-01/2002-11-28
Intercomparison of (low resolution) Temperature
Some statistical results
Page 10Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 300
10 GOM_NL__2*9 radio-soundings
LIDAR RMR Rome Tor Vergata
Lidar site: 41.83°N, 12.65°E, 150 a.s.l
Laser beamEmission: 532nm,355nm
Energy: 220 mJ, 470 mJ
Frequency: 10 Hz
RECEIVER ARRAYTelescope, 0.15 m
Aerosols and Water Vapor in low troposphere
Telescope, 0.3 m
Raman Temperature, Water Vapor (MIPAS Temperature & H2O validation)
9-Array telescopes 0.5 m (each)
Stratospheric aerosols and temperature (GOMOS and MIPAS Temperature validation)
Page 11Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
Intercomparison of High Resolution Temperature Profile
Page 12Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 2224 GOM_NL__2P*
star ID : 52Mv : 2.04T : 4500 K
Star ID : 142Mv : 2.85T : 8900 K
Intercomparison of High Resolution Temperature Profile
Page 13Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
AO 3602002-04-25
star ID : 81Mv : 2.36T : 28000 K
Dist. 300 kmTime delay : few hours
Page 14Envisat Validation Workshop, ACVT-GBMCD, GOMOS T 12/12/2002
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