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The 16-year periodicity in the winter surface temperature variations in the Antarctic Peninsula region

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Abstract

The aim of this work is a comprehensive study of the 16-year periodicity of winter surface temperature in the Antarctic Peninsula (AP) region, described earlier, and its possible source based on weather station records over the 1952–2019 period making use of the Scientific Committee on Antarctic Research (SCAR) Reference Antarctic Data for Environmental Research (READER) database, as well as Fourier and wavelet analysis methods. It is shown that interdecadal oscillation with a period of about 16 years dominates in the northern AP (Esperanza and Orcadas), which is consistent with previous results. The 16-year periodicity is found to closely correlate with the sea level pressure anomaly in the southwestern Atlantic associated with the zonal wave-3 and the Southern Annular Mode patterns. The correlation maximum in the southwestern Atlantic, having the characteristic features of the anticyclonic circulation, affects the surface temperature in the northern AP through the related structure of the zonal and meridional wind anomalies. This effect is weaker to the south, where the Vernadsky station data do not show a regular interdecadal periodicity. Due to the correlated variability in the wave-3 ridges, the pronounced 16-year periods exist also in the surface temperature of southern Australia–New Zealand region, as well as in the zonal mean sea level pressure at 30°–50° S. The sea surface temperatures are much less involved in the 16-year oscillation suggesting that atmospheric rather than oceanic processes appear to be more important for its occurrence.

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The data used in this study was downloaded from open sources (e.g. https://legacy.bas.ac.uk/met/READER/, http://www.esrl.noaa.gov/psd/).

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Acknowledgements

We acknowledge the SCAR READER database for free access to the monthly data of the Antarctic station surface meteorology, available at https://legacy.bas.ac.uk/met/READER/. NCEP–NCAR Reanalysis data and images were provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/. This work was partly supported by Taras Shevchenko National University of Kyiv, Ukraine, project 19BF051-08.

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Correspondence to Oleksandr Evtushevsky.

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Evtushevsky, O., Grytsai, A., Agapitov, O. et al. The 16-year periodicity in the winter surface temperature variations in the Antarctic Peninsula region. Clim Dyn 58, 35–47 (2022). https://doi.org/10.1007/s00382-021-05886-7

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  • DOI: https://doi.org/10.1007/s00382-021-05886-7

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