| Indo-Japanese Lidar Observations of the Tropical Middle Atmosphere During 1998 and 1999 |
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| 作者姓名： | Y. BHAVANI KUMAR C. NAGESWARA RAJU M. KRISHNAIAH |
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| 作者单位： | National MST Radar Facility, P. B. No: 123, Tirupati–517 502, A. P. India,Department of Physics, S.V. University, Tirupati–517 502, A. P. India,Department of Physics, S.V. University, Tirupati–517 502, A. P. India |
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| 基金项目： | The National MST Radar Facility （NMRF） located at Gadanki in India is operated by the Department of Space, Government of India. The authors would like to acknowledge, with thanks, the numerous contributions by their colleagues at the NMRF, India, and the Communications Research Laboratory （CRL）, Japan, in successfully operating the lidar facility under an Indo-Japanese collaboration program. |
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| 摘 要： | A state-of-the art Rayleigh and Mie backscattering lidar was set up at Gadanki (13.5N, 79.2E) in the Tropics in India. Using this system, regular observations of upper tropospheric clouds, aerosols at stratospheric heights and atmospheric temperatures in the range from 30 to 80 km were made. In this paper, the data collected during the period of 1998–99 were selected for systematic investigation and presentation. The Mie scattering lidar system is capable of measuring the degree of depolarization in the laser backscattering. Several tropical cirrus cloud structures have been identified with low to moderate ice content. Occasionally, thin sub-visible cirrus clouds in the vicinity of the tropical tropopause have also been detected. The aerosol measurements in the upper troposphere and lower stratosphere show low aerosol content with a vertical distribution up to 35 km altitude. Rayleigh-scattering lidar observations reveal that at the tropical site, temperature inversion occurs at mesospheric heights. Atmospheric waves have induced perturbations in the temperatures for several times at the upper stratospheric heights. A significant warming in the lower mesosphere associated with a consistent cooling in the upper stratospheric heights is observed particularly in the winter season during the events of sudden stratospheric warming (SSW).
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| 关 键 词： | 激光雷达 热带气候 卷云 气溶胶 同温层 重力波 温度 |
| 收稿时间： | 2005-07-12 |
| 修稿时间： | 2006-02-14 |
Indo-Japanese lidar observations of the tropical middle atmosphere during 1998 and 1999 |
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| Y. BHAVANI KUMAR,C. NAGESWARA RAJU,M. KRISHNAIAH.Indo-Japanese Lidar Observations of the Tropical Middle Atmosphere During 1998 and 1999[J].Advances in Atmospheric Sciences,2006,23(5):711-725. |
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| Authors: | Y Bhavani Kumar C Nageswara Raju M Krishnaiah |
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| Institution: | (1) National MST Radar Facility, P. B. No: 123, Tirupati, 517 502, A. P., India;(2) Department of Physics, S.V. University, Tirupati, 517 502, A. P., India |
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| Abstract: | A state-of-the art Rayleigh and Mie backscattering lidar was set up at Gadanki (13.5°N, 79.2°E) in the Tropics in India. Using this system, regular observations of upper tropospheric clouds, aerosols at stratospheric heights and atmospheric temperatures in the range from 30 to 80 km were made. In this paper, the data collected during the period of 1998-99 were selected for systematic investigation and presentation. The Mie scattering lidar system is capable of measuring the degree of depolarization in the laser backscattering. Several tropical cirrus cloud structures have been identified with low to moderate ice content. Occasionally, thin sub-visible cirrus clouds in the vicinity of the tropical tropopause have also been detected. The aerosol measurements in the upper troposphere and lower stratosphere show low aerosol content with a vertical distribution up to 35 km altitude. Rayleigh-scattering lidar observations reveal that at the tropical site, temperature inversion occurs at mesospheric heights. Atmospheric waves have induced perturbations in the temperatures for several times at the upper stratospheric heights. A significant warming in the lower mesosphere associated with a consistent cooling in the upper stratospheric heights is observed particularly in the winter season during the events of sudden stratospheric warming (SSW). |
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| Keywords: | backscatter lidar tropical atmosphere cirrus stratospheric aerosol gravity waves middle atmospheric temperatures upper stratospheric cooling |
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