High-resolution radio acoustic sounding system observations and analysis up to 20 km

被引：0
|
作者：
Alexander, Simon P. [1 ]
Tsuda, Toshitaka [1 ]
机构：
[1] Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan
来源：
Journal of Atmospheric and Oceanic Technology | 2008年 / 25卷 / 08期
关键词：
The first campaign-based measurements of virtual temperature in the upper-troposphere and lower-stratosphere (UTLS) region were made with the middle- and upper-atmosphere (MU) radar radio acoustic sounding system (RASS) during 4 days in August 1995. This dataset was examined in order to study high-frequency changes in the stability below 20 km; but especially in the UTLS region. Calculations of the WMO tropopause and cold-point tropopause heights showed the latter to be (1.0 ± 0.6) km higher; where 0.6 km is the standard deviation. A diurnal cycle of temperature and wind dominated the spectra; which was identified as the diurnal solar tide. Its phase maximum occurred in the afternoon between 5 and 15 km and showed upward energy propagation above this height. Changes in the UTLS kinetic energy dissipation rate Ε showed significant high-frequency fluctuations embedded within layers that persisted for at least 1 day. Relative to the WMO tropopause height; the median Ε increased from (0.5 ± 0.1) × 10-3 m2 s-3 in the upper troposphere to (0.7 ± 0.1) × 10-3 m2 s-3 in the lower stratosphere. © 2008 American Meteorological Society;
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摘要：
Conference article (CA)
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页码：1383 / 1396
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