Abstract
In this paper, statistical regularities of the intra-annual variability of heat fluxes in the North Atlantic during the ocean–atmosphere interaction are analyzed. A diffusion random process is considered as a mathematical model of the variability of heat fluxes. Parameters of this process, that is, the drift vector and the diffusion (or standard deviation) matrix, are estimated statistically using original methods. According to ERA-5 reanalysis data for 2011–2020, the evolution of these coefficients in the North Atlantic is studied and their behavior is compared with the behavior of the heat fluxes themselves. Zones of maximum, minimum, and average values of these flows are identified throughout the area under study with daily and 6-h averaging; their behavior and the behavior of their daily variability are described as random values throughout the year. Statistical fitting of parametric models of their distributions is implemented. Areas of the North Atlantic in which systematic factors are of decisive importance (the drift parameter exceeds the diffusion parameter) and vice versa are determined. This effect is discussed in terms of the behavior of the parameters of the probability distributions for increments of the processes under consideration. The spatiotemporal variability of the extreme characteristics of fluxes (maximum and minimum over the computational domain at a fixed time instant) is analyzed.
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ACKNOWLEDGMENTS
We are grateful to Corresponding Member, Russian Academy of Sciences, Dr. Sci. (Phys.–Math.) S.K. Gulev for our useful discussions of the results obtained in this work.
Funding
This work was supported in part by the Russian Foundation for Basic Research, project no. 19-07-00914, and was conducted as part of a state task for the Shirshov Institute of Oceanology, Russian Academy of Sciences (no. 0128-2021-0002), and the method described in Section 1 was developed with the support of the Russian Science Foundation (grant no. 20-17-00139).
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Translated by A. Nikol’skii
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Belyaev, K.P., Korolev, V.Y., Gorshenin, A.K. et al. Some Features of the Intra-Annual Variability of Heat Fluxes in the North Atlantic. Izv. Atmos. Ocean. Phys. 57, 619–631 (2021). https://doi.org/10.1134/S0001433821060025
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DOI: https://doi.org/10.1134/S0001433821060025