ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2013, Vol. 10, No. 2, pp. 212-224

Temporal variations in temperature of the middle atmosphere over southeastern Siberia, according to the MLS Aura measurements

M.A. Chernigovskaya 
Institute of Solar-Terrestrial Physics of Siberian Branch of RAS, Irkutsk, Russia
We analyse temporal and altitude variations in temperature of the middle atmosphere (upper troposphere, stratosphere, and mesosphere) over Irkutsk (52°N, 104°E) over the period from August 2004 to August 2012. The temperature was measured by MLS (Microwave Limb Sounder) on the EOS Aura satellite. We consider diurnal, interdiurnal and seasonal variations of temperature at heights of 11, 50 and 80 km. We observe a strong diurnal and interdiurnal variability of temperature at all heights under consideration. Variations in temperature within 24 hours manifest themselves mainly as an increase in temperature at night compared with daytime values. This difference is most marked at heights of the upper mesosphere. Temporal variations in temperature and height of the stratopause and mesopause were analysed separately: seasonal, diurnal and interdiurnal variations were revealed. The seasonal dynamics of temperature shows a clear annual periodicity. Average annual variations in temperature at given heights were obtained via data averaging for each day of the period under consideration. Using the analysis of altitude-temporal distribution of temperature for each month of the period under study, we revealed peculiarities of seasonal variations in temperature of the middle atmosphere. There is a significant difference between the degrees of variability in the atmospheric temperature at heights of the stratopause in summer and in winter. Apparently, it can be explained by the fact that there are sudden stratospheric warmings (anomalous warmings in the stratosphere up to several dozen degrees, which can sometimes exceed the summer maximum) observed at heights of the stratosphere over southeastern Siberia each summer.
Keywords: нижняя и средняя атмосфера, ионосфера, взаимодействие слоев атмосферы, the lower and upper atmosphere, ionosphere, interaction between atmospheric layers
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