Validation of CFC-12 measurements from the Improved Limb Atmospheric Spectrometer (ILAS) with the version 6.0 retrieval algorithm

[1] Measurements of CFC-12 were made by the Improved Limb Atmospheric Spectrometer (ILAS) between 57degreesN and 72degreesN in the Northern Hemisphere and between 64degreesS and 89degreesS in the Southern Hemisphere. ILAS was launched on 17 August 1996 on board the Advanced Earth Observing Satellite...

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Bibliographic Details
Published in:Journal of Geophysical Research: Atmospheres
Main Authors: Khosrawi, F., Müller, R., Johnson, D. G., Oelhaf, H., Wetzel, G., Sugita, T., Kanzawa, H., Yokota, T., Nakajima, H., Sasano, Y., Irie, H., Engel, A., Toon, G. C., Sen, B., Aoki, S., Nakazawa, T., Traub, W. A., Jucks, K. W.
Format: Article in Journal/Newspaper
Language:English
Published: Union 2004
Subjects:
info:eu-repo/classification/ddc/550
J
CFC-12
ILAS
validation
Fairbanks
Ilas
Kiruna
Alaska
Online Access:https://juser.fz-juelich.de/record/32895
https://juser.fz-juelich.de/search?p=id:%22PreJuSER-32895%22
Description
Summary:[1] Measurements of CFC-12 were made by the Improved Limb Atmospheric Spectrometer (ILAS) between 57degreesN and 72degreesN in the Northern Hemisphere and between 64degreesS and 89degreesS in the Southern Hemisphere. ILAS was launched on 17 August 1996 on board the Advanced Earth Observing Satellite (ADEOS). The ILAS validation balloon campaigns were carried out from Kiruna, Sweden (68degreesN, 21degreesE), in February and March 1997 and from Fairbanks, Alaska (65degreesN, 148degreesW), in April and May 1997. During these validation balloon campaigns, CFC-12 was measured with the in situ instruments ASTRID, BONBON, and SAKURA and the remote sensing spectrometers MIPAS-B, FIRS-2, and MkIV. ILAS version 6.0 CFC-12 profiles obtained at the nearest location to the validation balloon measurement are compared with these validation balloon measurements. The quality of ILAS CFC-12 data processed with the version 6.0 algorithm improved significantly compared to previous versions. Low relative differences between ILAS CFC-12 and the correlative measurements of about 10% were found between 13 and 20 km. The comparison of vertical profiles shows that ILAS CFC-12 data are useful below about 20-22 km inside the vortex and below about 25 km outside the vortex. However, at greater altitudes the relative percentage difference increases very strongly with increasing altitude. Further, correlations of CFC-12 with N2O show a good agreement with the correlative measurements for N2O values of N2O > 150 ppbv. In summary, ILAS CFC-12 data are now suitable for scientific studies in the lower stratosphere.

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