CRISTA validation of ROSE/DLR version 2.2

Data from the CRISTA-2 (Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere) mission from 8.-16. August 1997 were used for a validation of the ROSE/DLR model. Information about CRISTA-2 can be found on the CRISTA homepage. Results of a CRISTA validation campaign is given in table 3. Total ozone columns were calculated from CRISTA-2 derived ozone profiles and assimilated into the ROSE model.  Afterwards, profiles modelled by ROSE were compared with the original CRISTA-2 profiles. The number of CRISTA-2 measurements on each ROSE level is given in table 1 and the number of CRISTA-2 profiles used is given in table 2.

Results

Figures 1,3,5,7,9,11,13 show the comparison of the mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for a certain latitude interval. A green area marks the standard deviation of all ROSE profiles used in the comparison and black bars mark the standard deviation of all CRISTA-2 profiles used in the comparison. Looking at averaged profiles is justified through a relatively 'quiet' meteorological situation during the CRISTA-2 mission.

Figures 2,4,6,8,10,12,14 show the relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile. The relative difference is calculated as the ratio of absolute difference and CRISTA-2 measured value.

Figure 1: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 60 - 74 deg North. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 2: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 60 - 74 deg North.

Figure 3: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 40 - 60 deg North. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 4: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 40 - 60 deg North.

Figure 5: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 20 - 40  deg North. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 6: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 20 - 40 deg North.

Figure 7: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 20 deg South to 20 deg North. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 8: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 20 deg South to 20 deg North.

Figure 9: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 20 - 40 deg South. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 10: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 20 - 40 deg South.

Figure 11: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 40 - 60 deg South. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 12: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 40 - 60 deg South.

Figure 13: Mean, modelled ROSE ozone profile (black) versus the mean, measured CRISTA-2 ozone profile (blue) for 60 - 74 deg South. Green area marks standard deviation of all ROSE profiles and black bars mark the standard deviation of all CRISTA-2 profiles used.

Figure 14: Relative (black) and absolute (red) difference between the mean, modelled ROSE ozone profile and the mean, measured CRISTA-2 ozone profile for 60 - 74 deg South.


 

Comparison statistics:

ROSE level no.  No. CRISTA-2 data ROSE level no. No. CRISTA-2 data ROSE level no. No. CRISTA-2 data
1 54 15 23139 29 17717
2 379 16 23178 30 14715
3 1206 17 23204 31 8879
4 3394 18 23221 32 3923
5 8628 19 23189 33 1253
6 14747 20 23089 34 283
7 18476 21 22971 35 58
8 21125 22 22839 36 7
9 22054 23 22714 37 1
10 22574 24 22557

 

 

11 22807 25 22310

 

 

12 22954 26 21893

 

 

13 23031 27 21301

 

 

14 23081 28 19982

 

 

Table 1: Frequency distribution of used CRISTA-2 ozone profile data (on ROSE levels)



 
geographical region no. of profiles in CRISTA vs. ROSE comparison
60 - 74 deg North 2574
40 - 60 deg North 3355
20 - 40 deg North 3025
20 deg South - 20 deg North 5736
20 -40 deg South 2986
40 - 60 deg South 3316
60 - 74 deg South 2426

Table 2: Number of CRISTA-2 profiles used in the comparison separated in geographical regions.

  systematic error [%] statistical error [%]  
height [km] 40 deg South 0 deg 40 deg North 40 deg South 0 deg 40 deg North
55  26 25 25 8.6 6.8 5.6
50 16 14 13 2.4 2.1 1.9
45 12 12 12 2.0 2.0 2.0.
35 9 11 10 109 1.7 1.8
25 9 10 10 107 2.1 2.0
20 14 19 10 2.4 5.7 4.2

Table 3: CRISTA-2 systematic and statistical error derived from comparisons with ozone soundings. Relative errors refer to volume mixing ratios [ppmv]. Error estimation below 19 km was not possible due to the small ozone mixing ratios of 0.1 - 0.2 ppmv which is below the detection limit. (University of Wuppertal, 2000)

Authors: M. Bittner, T. Erbertseder, M. Hess, B. Hildenbrand, M. Schroedter

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