Thermal variability of the tropical tropopause region derived from GPS/MET observations
Thermal variability of the tropical tropopause region derived from GPS/MET observations
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DOI：
10.1029/2002jd002595
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发表时间：
2003-01
影响因子：
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通讯作者：
W. Randel;Fei Wu;Waleska Rivera Ríos
中科院分区：
文献类型：
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作者：
W. Randel;Fei Wu;Waleska Rivera Ríos
[1] 基于 1995 年 4 月至 1997 年 2 月期间的全球定位系统气象学 (GPS/MET) 观测，研究了热带对流层上层和平流层下层 (∼10-30 km) 的温度结构和变化。与数百个同地无线电探空仪的比较表明了热带地区 GPS/MET 反演的高精度。研究了热带冷点对流层顶的平均结构和变化，冷点温度和高度的大部分次季节变化似乎与波状波动（例如重力波或开尔文波）有关。 GPS/MET 温度与每日网格化传出长波辐射数据（热带深对流的代表）之间存在显着相关性，从而提供了 GPS/MET 温度波动的独立确认。这些相关性量化了大范围热带温度对瞬态对流的响应，显示出跨越经度半球的~12-18公里的相干波状变化。 GPS/MET 数据还显示了 16-40 公里海拔高度的平流层准两年振荡（QBO）的明确证据。
[1] Structure and variability of temperatures in the tropical upper troposphere and lower stratosphere (∼10–30 km) are studied based on Global Positioning System Meteorology (GPS/MET) observations during April 1995 to February 1997. Comparisons with several hundred colocated radiosondes demonstrates the high accuracy of GPS/MET retrievals in the tropics. Mean structure and variability of the tropical cold point tropopause is examined, and much of the subseasonal variability in cold point temperature and height appears to be related to wave-like fluctuations (such as gravity waves or Kelvin waves). Significant correlations are found between the GPS/MET temperatures and daily, gridded outgoing longwave radiation data (a proxy for tropical deep convection), providing independent confirmation of the GPS/MET temperature fluctuations. These correlations quantify the large-scale tropical temperature response to transient convection, showing coherent wave-like variations over ∼12–18 km which span a hemisphere in longitude. The GPS/MET data also show clear evidence of the stratospheric quasi-biennial oscillation (QBO) in temperatures over altitudes ∼16–40 km.