Characteristics of the tropical tropopause over different longitudes |
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| Authors: | Sanjay Kumar Mehta M Venkat Ratnam BV Krishna Murthy |
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| Institution: | 1. College of Meteorology and Oceanography, National University of Defense Technology, Changsha, China;2. Key Laboratory of Semi-Arid Climate Change and College of Atmospheric Sciences, Lanzhou University, Lanzhou, China;3. College of Computer, National University of Defense Technology, Changsha, China;4. Shandong Provincial Climate Center, Jinan, China;5. Trainer Simulation Training Center of Naval Aeronautical University, Huludao, China;1. Satellite Remote Sensing and Applications, Advanced centre for Atmospheric Radar Research, Cochin University of Science and Technology, Cochin 682022, Kerala, India;2. Met Office Hadley Centre, Exeter, UK |
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| Abstract: | The characteristics of the cold point tropopause (CPT), convective tropopause (COT) and tropical tropopause layer (TTL) in the tropical region at different longitudes are studied using radiosonde data at 5 stations in the tropical belt (±15°) and high resolution GPS radiosonde data from April 2006 to December 2008 at Gadanki (13.5°N, 79.2°E) also a tropical station. The CPT over Gadanki is found to be higher than over the rest of the stations. This aspect is further confirmed using COSMIC GPS RO observations. In the Northern Hemisphere (NH) winter, the CPT is coldest over stations in the Pacific region compared to the other stations while in the NH summer, it is coldest at Gadanki, a station in the Indian monsoon region. The range of seasonal variation of the CPT temperature is found to be quite small over Gadanki compared to the other stations whereas that of the CPT altitude is nearly the same. |
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