Assessment of the half-century evolution of mechanisms controlling the heat exchange between high and midlatitudes in the annual cycle |
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| Authors: | G P Kurbatkin |
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| Institution: | (1) Institute of Global Climate and Ecology, Glebovskaya ul. 20b, Moscow, 107532, Russia |
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| Abstract: | We present the results of joint analysis of (1) predominant modes of the low-frequency variability of the atmosphere, (2) mechanisms of formation of annual-cycle anomalies, and (3) sudden extreme anomalies on a planetary scale. NCEP/NCAR reanalysis data over 1958–1998 and operational objective analysis of the RF Service for Hydrometeorology and Environmental Monitoring (Rosgidromet) over 2002–2007 with monthly averaging are used. We have attempted to study the cases of extreme monthly mean anomalies in the atmospheric general circulation and their consequences. The role of interannual winter negative anomalies of the air temperature over continents in stabilizing the annual cycle of the present-day climate (which was observed in the 1950s–1960s) is shown, as well as the role of the deformation of the North Atlantic dipole into the planetary wave oriented from west to east (the deformation was observed in April 1997 and again in 2007) in the weakening of the annual climatic cycle. |
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