, Volume 21, Issue 5, pp 554562
First online:
Effective solution algorithm for tomographic inversion of volume emission rate from satellitebased limb measurement
 Zijun WangAffiliated withCollege of Geoexploration Science & Technology, Jilin University
 , Shengbo ChenAffiliated withCollege of Geoexploration Science & Technology, Jilin University Email author
Rent the article at a discount
Rent now* Final gross prices may vary according to local VAT.
Get AccessAbstract
The volume emission rate (VER) of airglow can be used to investigate atmospheric processes. Satellitebased limb measurement of atmosphere is able to obtain the VER profile of airglow with high vertical resolution. However, the traditional onedimensional retrieval techniques for VER inversion fail to retrieve horizontal structure of VER profile. Thus, the tomographic technique based on the maximum probability is applied to retrieving twodimensional VER profile of airglow from infrared limb measurement. This technique could process the observed data with low signaltonoise ratio caused by the observation angle of less than 180° due to the solid nature of the Earth. For saving the processing time and improving the computing speed of VER inversion, serial tables for storing the large sparse matrix for radiance simulation and a large dataset during iterative estimate of VER are presented. The index and weighting factor of line of sight (LOS) through each grid are saved in initial estimate to avoid being computed repeatedly. Furthermore, the product of observed radiance and corresponding weighting factor obtained in initial iteration is stored as weighted observed radiance for the iterative calculation subsequently. Based on the improved algorithm, the VER of airglow is inversed through the tomographic technique. The full width of half maximum (FWHM) of error is 1.78% and the offset of the peak percentage error is 0.22% after 40 iterations for final VER. Comparison of assumed and retrieved VER profiles suggests that VER can be retrieved with a bias of 15% between 10 km and 90 km above the LayerMin (6384 km from the Earth center), and with a bias of 8% for altitude from 30 km to 60 km with vertical resolution of 1 km after 40 iterations. After improvements, the computation speed of VER inversion for once can be improved by 29.6 times for 700 images of 1/3 orbit, and accordingly, the processing time will be reduced from 3 hours and 11 minutes to only 6 minutes. In conclusion, the improvements to tomographic inversion of VER of airglow proposed in this paper are effective and significant.
Keywords
volume emission rate tomographic technique limb measurement radiance airglow Title
 Effective solution algorithm for tomographic inversion of volume emission rate from satellitebased limb measurement
 Journal

Chinese Geographical Science
Volume 21, Issue 5 , pp 554562
 Cover Date
 201110
 DOI
 10.1007/s1176901104660
 Print ISSN
 10020063
 Online ISSN
 1993064X
 Publisher
 SP Science Press
 Additional Links
 Topics
 Keywords

 volume emission rate
 tomographic technique
 limb measurement
 radiance
 airglow
 Industry Sectors
 Authors

 Zijun Wang ^{(1)}
 Shengbo Chen ^{(1)}
 Author Affiliations

 1. College of Geoexploration Science & Technology, Jilin University, Changchun, 130026, China