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doi:10.5194/esd-2017-37
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
06 Apr 2017
Review status
This discussion paper is under review for the journal Earth System Dynamics (ESD).
Atmospheric teleconnections between the Arctic and the Baltic Sea regions
Liisi Jakobson1,2, Erko Jakobson2, Piia Post1, and Jaak Jaagus1 1University of Tartu, Tartu, Estonia
2Tartu Observatory, Tõravere, Estonia
Abstract. The teleconnections between meteorological parameters of the Arctic and the Baltic Sea regions were analysed based on the NCEP-CFSR reanalysis data for 1979–2015. The Baltic Sea region was characterised by meteorological values at a testing point (TP) in Southern Estonia (58 N, 26 E). Temperature and specific humidity at the 1000 hPa level at the TP have a strong negative correlation with the Greenland region during all seasons except summer. The strongest teleconnections between the same parameter at the Baltic Sea region and the Arctic are found in winter, but they are clearly affected by the Arctic Oscillation (AO) index. After removal of the AO index variability, correlations in winter were below ±0.5, while in other seasons there remained regions with strong (|R| > 0.5) correlations. Strong correlations are present between different climate variables at the TP and the Arctic. Temperature and wind speed at the 1000 hPa level in the Baltic Sea region have a significant positive correlation with sea ice concentration in Baffin Bay and in regions between the North Pole and Greenland during all seasons except summer. These teleconnections cannot be explained with the AO index variability. The most permanent lagged correlations in 1000 hPa temperature are in summer at the TP with the Baffin Bay region in the previous spring, winter and even autumn. At every season there are some regions in the Arctic that has strong teleconnections (|R| > 0.5, p < 0.002) with temperature, specific humidity, wind speed and air pressure in the Baltic Sea region. These relationships can be explained by the AO/NAO index variability only in winter.

Citation: Jakobson, L., Jakobson, E., Post, P., and Jaagus, J.: Atmospheric teleconnections between the Arctic and the Baltic Sea regions, Earth Syst. Dynam. Discuss., doi:10.5194/esd-2017-37, in review, 2017.
Liisi Jakobson et al.
Liisi Jakobson et al.
Liisi Jakobson et al.

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Short summary
Relationships between meteorological parameters between Arctic and the Baltic Sea regions were investigated using NCEP-CFSR reanalysis for 1979–2015. The Greenland and Baffin Bay regions climate have the most significant teleconnections with the Baltic Sea region temperature, specific humidity and wind speed. These relationships can be explained by the AO/NAO index variability only in winter. The results are valuable for selecting Arctic regions with the largest effect on the Baltic Sea region.
Relationships between meteorological parameters between Arctic and the Baltic Sea regions were...
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