Abstract
Because of the small amplitude of insolation variations (1365.2–1366.6 W m−2 or 0.1%) from the 11-year solar cycle minimum to the cycle maximum and the structural complexity of the climatic dynamics, it is difficult to directly observe a solar signal in the surface temperature. The main difficulty is reduced to two factors: (1) a delay in the temperature response to external action due to thermal inertia, and (2) powerful internal fluctuations of the climatic dynamics suppressing the solar-driven component. In this work we take into account the first factor, solving the inverse problem of thermal conductivity in order to calculate the vertical heat flux from the measured temperature near the Earth’s surface. The main model parameter—apparent thermal inertia—is calculated from the local seasonal extremums of temperature and albedo. We level the second factor by averaging mean annual heat fluxes in a latitudinal belt. The obtained mean heat fluxes significantly correlate with a difference between the insolation and optical depth of volcanic aerosol in the atmosphere, converted into a hindered heat flux. The calculated correlation smoothly increases with increasing latitude to 0.4–0.6, and the revealed latitudinal dependence is explained by the known effect of polar amplification.
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Volobuev, D.M., Makarenko, N.G. Global correlation between surface heat fluxes and insolation in the 11-year solar cycle: The latitudinal effect. Geomagn. Aeron. 54, 903–906 (2014). https://doi.org/10.1134/S0016793214070172
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DOI: https://doi.org/10.1134/S0016793214070172