Long‐term variation of the temperature of the middle atmosphere at mid‐latitude: dynamical and radiative causes
Long‐term variation of the temperature of the middle atmosphere at mid‐latitude: dynamical and radiative causes
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DOI：
10.1029/jd092id09p10933
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发表时间：
1987-09
影响因子：
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通讯作者：
M. Chanin;N. Smires;Alain Hauchecorne
中科院分区：
文献类型：
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作者：
M. Chanin;N. Smires;Alain Hauchecorne
自1979年以来，上普罗旺斯天文台（法国，北纬44度，东经6度）一直在使用瑞利激光雷达技术测量中层大气的温度。这项研究使用了35-75公里高度范围内的500多个温度剖面图。主要结果如下：1981年至1985年期间，在中间层（65公里处-20 °K）和平流层（40公里处+20 ° K）观测到了相反符号的温度趋势;但是，平流层的趋势只出现在冬季，而中间层的趋势全年都有。这些温度变化表现出高度显着的相关性与太阳通量（代表在10.7厘米的无线电通量）在中间层和一个同样显着的相关性在冬季平流层。另一方面，50公里高度层的温度没有任何长期变化。这些结果被解释为由于叠加的直接响应的中间层的紫外线通量的增加和第二个效果，主要存在于冬季，影响所有的高度范围。这种效应可能与11年的太阳活动周期有关，但它的高度依赖性和符号只能通过行星波活动的变化来解释。
Temperature of the middle atmosphere has been measured since 1979 at the Observatory of Haute-Provence (France, 44°N, 6°E) using the Rayleigh lidar technique. More than 500 temperature profiles in the height range 35–75 km have been used in that study. The main results are the following: temperature trends of opposite sign have been observed in the mesosphere (−20°K at 65 km) and in the stratosphere (+20°K at 40 km) between 1981 and 1985; but while the trend in the stratosphere is only found in winter, the tendency in the mesosphere is observed all year around. These temperature changes exhibit a highly significant correlation with the solar flux (represented by the radio flux at 10.7 cm) in the mesosphere and an equally significant anticorrelation in the winter stratosphere. On the other hand, the temperature at the 50-km level does not present any long-term variation. These results are interpreted as due to a superposition of a direct response of the mesosphere to the increase of the UV flux and a second effect, mainly present in winter, which affects all height ranges. This effect may or not be related to the 11-year solar cycle, but its height dependence and its sign can only be interpreted by a change in the planetary wave activity.