2011•RMIT Research Repository (RMIT University Library)Requires access
Global Tropopause Derived from COSMIC for Climate Study
Li, Ying, Zhang, Kefei, Norman, Robert, Wu, Suqin, Carter, Brett, Wang, Chuan-Sheng, Le Marshall, John
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Abstract
In this paper, tropopause height and temperature parameters derived from\nConstellation Observing System for Meteorology Ionosphere & Climate\n(COSMIC) radio occultation (RO) and radiosonde measurements are\nperformed and the results are analysed. Two different tropopause definitions\nare used and the data are calculated from 2007 to 2010 on a global scale. The\nvalidation of RO temperature profiles against those from radiosonde data\nindicate the suitability of the RO data for a tropopause study. Spatial variations of the tropopause parameters are investigated and the results show that most of the tropopause parameters are highly correlated with latitude\nand not well correlated with longitude. The suitability of lapse-rate tropopause (LRT) and cold-point tropopause(CPT) definitions are investigated by analysing the agreement of the tropopasue parameters\nderived from both COSMIC and radiosonde data. Results indicate that the LRT definition is suitable for high latitude regions and the CPT definition is more suitable for low and middle latitude regions.