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Dynamics Of Seasonal Patterns In Geochemical, Isotopic, And Meteorological Records Of The Elbrus Region Derived From Functional Data Clustering

https://doi.org/10.24057/2071-9388-2019-180

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Abstract

A nonparametric clustering method, the Bagging Voronoi K-Medoid Alignment algorithm, which simultaneously clusters and aligns spatially/temporally dependent  curves,  is applied to study various data series from the Elbrus  region (Central Caucasus). We used the algorithm to cluster annual curves obtained by smoothing of the following synchronous data series: titanium concentrations in varved (annually laminated) bottom sediments of proglacial  Lake Donguz-Orun;  an oxygen-18 isotope record in an ice core from Mt. Elbrus; temperature and precipitation observations with a monthly resolution from Teberda and Terskol meteorological stations. The data of different types were clustered independently. Due to restrictions concerned with the availability of meteorological data, we have fulfilled the clustering procedure separately for two periods: 1926–2010 and 1951–2010. The study is aimed to determine whether the instrumental period could be reasonably divided (clustered)  into several sub-periods using different climate and proxy time series; to examine the interpretability of the resulting borders of the clusters (resulting time periods); to study typical patterns of intra-annual variations of the data series. The results of clustering suggest that the precipitation and to a lesser degree titanium decadal-scale data may be reasonably grouped, while the temperature and oxygen-18 series are too short to form meaningful clusters; the intercluster boundaries show a notable degree of coherence between temperature and oxygen-18 data, and less between titanium and oxygen-18 as well as for precipitation series; the annual curves for titanium and partially precipitation data reveal much more pronounced intercluster  variability than the annual patterns of temperature and oxygen-18 data.

About the Authors

Gleb A. Chernyakov
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


Valeria Vitelli
University of Oslo
Norway

Department of Biostatistics

Sognsvannsveien  9, 0372, Oslo



Mikhail Y. Alexandrin
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


Alexei M. Grachev
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


Vladimir N. Mikhalenko
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


Anna V. Kozachek
Arctic and Antarctic Research Institute
Russian Federation
38 Bering st., 199397, St. Petersburg


Olga N. Solomina
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


V. V. Matskovsky
Institute of Geography, Russian Academy of Sciences
Russian Federation
29 Staromonetniy lane, 119017, Moscow


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For citation:


Chernyakov G.A., Vitelli V., Alexandrin M.Y., Grachev A.M., Mikhalenko V.N., Kozachek A.V., Solomina O.N., Matskovsky V.V. Dynamics Of Seasonal Patterns In Geochemical, Isotopic, And Meteorological Records Of The Elbrus Region Derived From Functional Data Clustering. GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY. 2020;13(3):110-116. https://doi.org/10.24057/2071-9388-2019-180

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ISSN 2071-9388 (Print)
ISSN 2542-1565 (Online)