Ozone profiles retrieval from SCIAMACHY Chappuis-Wulf limb scattered spectra using MART
The Scanning Imaging Absorption spectroMeter for Atmospheric ChartographY (SCIAMACHY) instrument, launched on the Envisat satellite in March 2002, measures the earthshine radiance, simultaneously from the ultraviolet (UV) to the near infrared (NIR), in the three viewing geometries: nadir, limb, and occultation. These measurements are used to retrieve both the total amount and vertical profiles of a large number of atmospheric constituents. In this paper, stratospheric ozone profiles between 15 and 40 km altitude are retrieved on 3 km grids from SCIAMACHY limb scattered radiance in the ChappuisWulf band. The study employs a new multiplicative algebraic reconstruction technique (MART) coupled with the radiative transfer model SCIATRAN. This technique is outstanding in that more than one measurement vector element can be used to retrieve the ozone density at any altitude. Furthermore, it is straightforward to understand, easy to implement and likely to produce stable results. Radiance normalization and wavelength pairing is applied to radiance as an intermediate step, using the wavelengths 525 nm, 600 nm and 675 nm. The sensitivity of ozone retrieval by this method to tangent altitude pointing, surface albedo, aerosol and cloud parameters is studied, and the results show that the retrieval impact due to tangent altitude pointing bias is the biggest up to 75％ with 1 km shift, and the impact of albedo is limited within 5％. The effect of boundary visibility and cloud parameters can be ignored since their impact is too small. The effectiveness of the retrieval is demonstrated using a set of coincident SCIAMACHY products at Hefei that shows a mean bias of less than 12％ between 15 and 40 km, and with a better accuracy of 5％ from 16 to 36 km.
SCIAMACHY limb scatter MART radiance normalization wavelength pairing
WANG ZiJun CHEN ShengBo JIN LiHua YANG ChunYan
College ofGeoexploration Science & Technology, Jilin University, Changchun 130026, China College of Geoexploration Science & Technology, Jilin University, Changchun 130026, China The Second Brigade of Surveying and Mapping, Heilongjiang Bureau of Surveying and Mapping, Harbin 15
国际会议
北京
英文
273-280
2010-04-27（万方平台首次上网日期，不代表论文的发表时间）