Affiliation:
1. A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences
2. Swedish Institute of Space Physics
3. Institute of Space Research, Russian Academy of Sciences
4. Institute of Electrophysics and Electric Power, Russian Academy of Sciences
Abstract
An analysis of the long-term change of the average annual OH* temperature, the values of which were obtained from nighttime spectral observations of the hydroxyl emission bands at the Zvenigorod scientific station (56° N, 37° E) from 1957 to 2022, is presented. This series of OH* temperatures, reflecting the thermal state of the mesopause region, is the longest among all known observations. On its basis, estimates of the linear trend and response of temperature to changes in solar activity was made both in general over the entire set of data and for different time intervals. In the first case, the trend was −0.23 ± 0.04 K/yr. In the second case, the analysis showed strong cooling (−0.53 ± 0.34 K/yr) until the 1970s and its slowdown to −0.14 ± 0.03 K/yr thereafter. A comparison of the results of the analysis with other measurements and model calculations shows that the latter have lower trend values. It is assumed that the reasons for the temperature trend, in addition to the growth of greenhouse gases, the main of which is CO2, may be long-term changes in the dynamics of the upper atmosphere.
Publisher
The Russian Academy of Sciences
Reference63 articles.
1. Гайнуллина Р.Х., Карягина З.В. Определение температуры верхней атмосферы по вращательным полосам спектра гидроксила // Спектральные, спектрофотометрические и радиолокационные исследования полярных сияний и свечения ночного неба. № 2−3. С. 63−65. 1960.
2. Герасимова Н.Г., Яковлева А.В. Комплект светосильных спектрографов с дифракционными решетками // Приборы и техника эксперимента. № 1. С. 83−86. 1956.
3. Капорский Л.Н., Николаева И.И. Оптические приборы. Каталог / Под ред. В.А. Никитина. М.: Машиностроение. 305 с. 1969.
4. Мерзляков Е.Г., Портнягин Ю.И. Многолетние изменения параметров ветрового режима нижней термосферы умеренных широт (90−100 км) // Изв. РАН. Физика атмосферы и океана. Т. 35. С. 531−542. 1999.
5. Мохов И.И., Семенов А.И., Володин Е.М., Дембицкая М.А. Выхолаживание в области мезопаузы при глобальном потеплении по данным измерений и модельным расчетам // Изв. РАН. Физика атмосферы и океана. Т. 53. № 4. С. 435−444. 2017.