Difference of CALIOP Transient Response Between Winter and Summer in Northern Hemisphere

Abstract

Abstract:

The transient responses of the CALIOP instrument in the 532 nm parallel and perpendicular channel are derived and analyzed from the CALIOP level 1 version 3 products in the winter and summer of 2008. The results show that there is great difference between winter and summer in northern hemisphere. For the reason that Antarctic and Greenland are almost entirely covered by snow and ice all the year round, the characteristic of transient response on these land cloud be a basis for judging whether the transient response is caused by snow or ice in somewhere else. The distribution statistics of about 41.8% samples in winter are the same as that of the samples in summer in northern hemisphere. It means these areas are not covered by snow and ice. The other 52.8% samples’ statistics are consistent with the samples on Antarctic and Greenland, indicating that these areas are covered by snow and ice.

Key words: CALIOP, PMT, transient response

CLC Number:

YAN Huai-Bin, Wu-Dong. Difference of CALIOP Transient Response Between Winter and Summer in Northern Hemisphere[J]. Journal of Atmospheric and Environmental Optics, 2014, 9(4): 295-299.

References

[1] Winker D M, Vaughan M A, Omar A H, et al. Overview of the CALIPSO mission and CALIOP data processing algorithms [J]. J.Atmos. Ocean. Tech., 2009, 26(11): 2310-2323.
[2] Wu D, Hu Y X, Mccormick M P, et al. Global cloud layer distribution statistics from one year’s CALIPSO lidar observations [J]. Int. J. Remote Sens., 2011, 32(5): 1269-1288.
[3] Wei Shuxiao, Wu Dong. Cloud distribution over China sea and adjacent sea area from CALIPSO lidar observations [J]. Journal of Atmospheric and Environmental Optics, 2013, 8(1):46-52(in Chinese).
魏书晓, 吴东. 利用星载激光雷达研究中国海及其周边海域的云层分布 [J]. 大气与环境光学学报, 2013, 8(1): 46-52.
[4] Wu Dong, Jia Jia. Global penetrability statistics of CALIPSO over ocean laser samples [J]. Journal of Atmospheric and Environmental Optics, 2011, 6(4): 252-259 (in Chinese).
吴东, 贾佳. CALIPSO星载激光在全球海洋上空的穿透性统计 [J]. 大气与环境光学学报, 2011, 6(4): 252-259。
[5] Lu X, Hu Y, Liu Z, et al. CALIOP receiver transient response study [C]. Proc. SPIE, Polarization Science and Remote Sensing VI, 2013: 887316-887316-9.
[6] Acharya Y B, Sharma S, Chandra H. Signal induced noise in PMT detection of lidar signals [J]. Measurement, 2004, 35(3): 269-276.
[7] Zhao Yanzeng. Signal-induced fluorescence in photomultipliers in differential absorption lidar systems [J]. Appl. Opt., 1999, 38(21): 4639-4648.
[8] Li J, Hu Y, Huang J, et al. A new method for retrieval of the extinction coefficient of water clouds by using the tail of the CALIOP signal [J]. Atmos. Chem. Phys., 2011, 11(6): 2903-2916.
[9] Hu Yongxiang, Powell K, Vaughan M, et al. Elevation information in tail (EIT) technique for lidar altimetry [J]. Opt. Express, 2007, 15(22): 14504-14515.
[10] Lu X, Hu Y, Trepte C, et al. A super-resolution laser altimetry concept [C]. Proc. SPIE, International Symposium on Lidar and Radar Mapping 2011: Technologies and Applications, 2011: 82860B-82860B-7.
[11] Lu X, Hu Y. Ice sheet surface elevation retrieval from CALIPSO lidar measurements [C]. Proc. SPIE, Laser Radar Technology and Applications XVIII, 2013: 87310Z-87310Z-8.
[12] Lu X, Hu Y, Trepte C, et al. A super-resolution laser altimetry concept [J]. Geosci. Remote S., 2013, 11(1): 298-302.
[13] Hu Y, Vaughan M, Liu Zhaoyan, et al. The depolarization-attenuated backscatter relation: CALIPSO lidar measurements vs. theory [J]. Opt. Express, 2007, 15(9): 5327-5332.
[14] Behrenfeld M J, Hu Yongxiang, Hostetler C A, et al. Space-based lidar measurements of global ocean carbon stocks [J]. Geophys. Res. Lett., 2013, 40(16): 4355-4630.
[15] Rodier S, Hu Y, Vaughan M. Sea ice detection with space-based lidar [J]. The Cryosphere Discuss, 2013, 7(5): 4681-4701.