Abstract：The method of retrieving the concentration of trace gases using of the diagnostic absorption of trace gases based on the scattered sunlight is called passive DOAS. It has been developed so fast in recent years because it remains simple and is prone to being combined with different platform. While retrieving the column density of trace gases with the scattered sunlight as light source, it will be affected strongly by solar Fraunhofer lines, which is also called Ring effect. It makes it hard to retrieve trace gases concentration and affects measurement precision, especially for lower concentration. The influence of Ring effect and its relation with solar zenith angle in stable day will be introduced in the present paper, and the modification will be provided so that different Ring spectrum is selected according to different solar zenith angle. The slant column density (SCD) of NO2 for 3 stable days was retrieved with this modification. It was proved that the modification is possible.
[1] Honninger G, Von Friedeburg C, Platt U. Atmospheric Chemistry Physics, 2004, 4: 231. [2] Wenig Mark, Jahne Bernd, Platt Ulrich. Applied Optics, 2005, 44(16): 3246. [3] ZHOU Bin, LIU Wen-qing, ZHENG Chao-hui, et al(周 斌，刘文清，郑朝辉，等). Acta Physica Sinica(物理学报)，2000，49(12): 2507. [4] LI Ang, XIE Pin-hua, LIU Cheng, et al(李 昂，谢品华，刘 成，等). Chinese Physics Letters(中国物理快报), 2007, 24(10): 2859. [5] QIN Min, XIE Pin-hua, LIU Jian-guo, et al(秦 敏, 谢品华, 刘建国, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2005, 25(9): 1463. [6] LI Su-wen, LIU Wen-qing, XIE Pin-hua(李素文, 刘文清, 谢品华). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(12): 2291. [7] SI Fu-qi, LIU Jian-guo, XIE Pin-hua, et al(司福祺, 刘建国, 谢品华, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(10): 1810. [8] XIE Pin-hua, FU Qiang, LIU Jian-guo, et al(谢品华，付 强，刘建国，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(9): 1584. [9] SI Fu-qi, LIU Jian-guo, XIE Pin-hua, et al(司福祺，刘建国，谢品华，等). Acta Physica Sinica(物理学报), 2006, 55(6): 3165. [10] Joiner J, Barthia P, Cebula R, et al. Applied Optics, 1995, 34(21): 4513. [11] Vountas M, Rozanov V, Burrows J P. Journal of Quantitative and Radiative Transfer, 1998, 60(6): 943. [12] Fish D J, Jones R L. Geophysical Research Letters, 1995, 22(7): 811. [13] Stam D M, Aben I, Helderman F. Journal of Geophysical Research, 2002, 107(D20): 4419. [14] Clarke D, Naghizadeh-Khouei J. Planet Space Sci., 2000, 48: 285. [15] Vountas M, Rozanov V V, Burrows J P. Journal of Quantitative and Radiative Transfer, 1998, 60: 943. [16] Kelly V Chance, Robert J D Spurr. Applied Optics, 1997, 36( 21)：5224. [17] de Beek R, Vountas M, Rozanov V V, et al. Geophysical Research Letters, 2001, 28 (4): 721. [18] Pallamraju D, Baumgardner J, Chakrabarti S. Geophysical Research Letters, 2000, 27(13): 1875. [19] Platt U, Marquard L, Wagner T, et al. Geophysical Research Letters, 1997, 24: 1759.
