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首页> 外文期刊>Earth, planets and space: EPS >Multi-year temperature measurements of the middle atmosphere at Chatanika, Alaska (65°N, 147°W)
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Multi-year temperature measurements of the middle atmosphere at Chatanika, Alaska (65°N, 147°W)

机译：阿拉斯加Chatanika的中层大气的多年温度测量（65°N，147°W）

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摘要

Over an eight-year period (1997-2005) Rayleigh lidar temperature measurements of the stratosphere and mesosphere (40-80 km) have been made at Poker Flat Research Range, Chatanika, Alaska (65°N, 147°W). The Rayleigh lidar measurements have been made between mid-August and mid-May. These measurements have yielded a total of approximately 904 hours of temperature measurements of the middle atmosphere over 116 nights. The seasonal evolution of the middle atmosphere shows an annual cycle with maximum in summer below 60 km and a reversal of the cycle with minimum in summer above 60 km. The monthly mean stratopause has a highest temperature of 273 K at an altitude of 47.5 km in May and a lowest temperature of 243 K at an altitude of 54.7 km in January. However, nightly stratopause temperatures in January and December are sometimes warmer than those in May and August. An elevated stratopause (>65 km) is observed on 5 occasions in 41 observations in January and February. The Chatanika measurements are compared with five other Arctic data sets and models. The upper stratosphere at this site is slightly colder than the zonal mean as well as sites in Greenland and Scandinavia with the largest differences found in January. We discuss the wintertime temperatures in the upper stratosphere and lower mesosphere in terms of the position of the polar vortex and the increased occurrence of stratospheric warming events during the 1997-2005 observation period.
机译：在八年期间（1997年至2005年），阿拉斯加Chatanika的Poker Flat研究范围（65°N，147°W）对平流层和中层（40-80 km）进行了瑞利激光雷达温度测量。在8月中旬至5月中旬之间进行了Rayleigh激光雷达测量。这些测量结果在116夜中对中层大气进行了总计904个小时的温度测量。中层大气的季节演变表​​明，一年周期最大，夏季在60公里以下，而夏季周期最小，夏季在60公里以上。 5月在47.5 km的高度上，平均平流层顶的最高温度为273 K，1月在54.7 km的高度上，最低的平均温度为243K。但是，1月和12月的夜间层顶风有时比5月和8月的温度高。在1月和2月的41次观测中，有5次观察到层状顶升高（> 65 km）。 Chatanika测量值与其他五个北极数据集和模型进行了比较。该地区的平流层上层比纬向平均温度略低，格陵兰和斯堪的纳维亚半岛的位置也较一月平均温度低。我们根据极涡的位置和1997-2005年观测期平流层变暖事件的增加，讨论了平流层上部和中层下部的冬季温度。

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