QBO and solar activity effects on temperatures in the mesopause region |
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| Affiliation: | 1. Postgraduate Program in Climate and Environment (CLIAMB, INPA/UEA), Av. André Araújo, 2936, Campus II, Aleixo, 69060-001 Manaus, Amazonas, Brazil;2. Amazonas State University, Superior School of Technology, Av. Darcy Vargas, 1200, Parque 10 de Novembro, 69065-020 Manaus, Amazonas, Brazil;3. National Institute for Space Research, Center for Weather Forecasting and Climate Research, Av. dos Astronautas, 1758, 12227-010 São José dos Campos, São Paulo, Brazil;4. Federal University of Parana, Environmental Engineering Department, Rua Francisco H. dos Santos, 100, Jardim das Américas, 81531-990 Curitiba, Paraná, Brazil;5. School of Engineering and Applied Sciences, Harvard University, 02138 Cambridge, MA, USA;6. Postgraduate Program in Ecology (PPG-ECO, INPA), Av. André Araújo, 97, Campus III, Adrianópolis, 69060-000 Manaus, Amazonas, Brazil;7. Postgraduate Program in Water Resources and Environmental Engineering (PPGERHA, UFPR), Rua Evaristo F. F. da Costa, Campus Polytechnic Centre, Jardim das Americas, 80050-540, Curitiba, Paraná, Brazil |
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| Abstract: | This statistical correlation study is based on two upper mesospheric temperature data sets for the region around 90 km, on the phase of the quasi-biennial oscillation (QBO) and on the solar 10.7-cm radiation. The temperatures are measurements from passive OH1-spectrometers and lidar sounding experiments carried out between 1980 and 1988 at geographic latitudes between 50°N and 70° N. An anticorrelation exists betwen the 10.7-cm flux and the temperatures. Two different types of significance tests were used to check the confidence level of the correlation. The anti-correlation is highly significant (confidence ⪢ 99.99%) for latitudes around 50°N if the QBO is in its east phase and for the spring/summer temperatures. The anti-correlation is not significant for the QBO west phase and for fall/winter temperatures (confidence < 95%). For higher latitudes, around 79°N, no significant correlation was found. |
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