RECENT CLIMATE CHANGE OVER THE TERRESTRIAL PART OF EXTRATROPICAL NORTHERN HEMISPHERE ZONE
Abstract
Relations of surface air temperature variations over the terrestrial part of extratropical Northern Hemisphere zone with the macro-scale atmospheric circulation in terms of the Northern Hemisphere Teleconnection Patterns indices are studied. Evaluations obtained as a result of stepwise multiple regression show that winter temperature changes observed since the mid of the 21st century, including the abrupt increase in 1970–1990-s and subsequent warming hiatus, could be almost entirely explained by circulation variations related to three centers of action, i. e. North-Atlantic Oscillation (NAO), Pacific-NorthAmerican (PNA) and Scandinavian (Scand). Change of the recent global warming phases demonstrates the differences in the regime of atmospheric centers influence on temperature variability. The latter allows indicating the different regimes of macro-scale circulation. In the beginning of the 1970-s the meridional circulation with the prevalent impact of PNA centers of action changed for zonal circulation, due to the increasimg role of NAO. Since the mid of the 1990-s, the role of meridional circulation increases again, but unlike in the 1950–1970-s it is caused by the Scand centers of action, i.e. north-east Atlantic and West-Eurasian sector of the Arctic.
Keywords
centers of atmosphere action,
circulation indices,
surface air temperature,
variability,
trends,
multiple regression
Supporting agencies: The study was financially supported by the Program of Federal Science Research (№ 0148-2014-0015), the RAS Presidium Program of Basic Research (№ 44П).
About the Authors
V. V. Popova
Institute of Geography, Russian Academy of Sciences
Russian Federation
Laboratory of Climatology, Leading Scientific Researcher, PhD in Geography
Russian Federation
Laboratory of Climatology, Leading Scientific Researcher, PhD in Geography
V. V. Matskovsky
Institute of Geography, Russian Academy of Sciences
Russian Federation
Department of Glaciology, Scientific Researcher, PhD in Geography
Russian Federation
Department of Glaciology, Scientific Researcher, PhD in Geography
A. Yu. Mikhailov
Institute of Geography, Russian Academy of Sciences
Russian Federation
Laboratory of Climatology, Senior Scientific Researcher, PhD in Geography
Russian Federation
Laboratory of Climatology, Senior Scientific Researcher, PhD in Geography
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For citations:
Popova V.V., Matskovsky V.V., Mikhailov A.Yu. RECENT CLIMATE CHANGE OVER THE TERRESTRIAL PART OF EXTRATROPICAL NORTHERN HEMISPHERE ZONE. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2018;1(1):3-13. (In Russ.)
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