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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Activity of planetary waves at the stratosphere heights during 2007-2009 winters Kanukhina Anna , Vlasov Alexey , Savenkova Elena , Pogoreltsev Alexandr Russian State Hydrometeorological University Planetary wave activity is studied in the boreal winter stratosphere on the basis of the UK Met Office temperature and geopotential height data. Decomposition of standing and travelling amplitudes according to the recalculation procedure produced the following results. During 2007-2009 winters, at the stratospheric higher-middle latitudes the amplitudes of eastward traveling waves having period near 32 days dominate the westward ones according to analysis of the temperature and geopotential height data. Amplitudes of the eastward travelling waves at the 20 days period are comparable with the westward wave amplitudes or higher. Well pronounced 5- and 7-10-day westward waves are characterized with maximal amplitudes. While at the lower-middle latitudes the westward components of traveling planetary waves are predominant both at the temperature and geopotential height data. The amplitudes of stationary (standing) and traveling planetary waves are comparable in values within 30N-40N area. It is obtained that, at 1 hPa height westward wave amplitudes are close to standing wave amplitude values and having maxima within 7 and 22-day periods. UK Met Office data were used to estimate intra-seasonal variability of the zonal mean planetary waves in the stratosphere and allowed to clarify a dominance of eastward waves at higher latitudes than at the lower ones. The described dominance of eastward waves within 60N-70N could be explained with the coincidence to their generation area at the stratospheric heights. Another line for a discussion is the amplification of stationary planetary waves during winters 2007- 2009 and their connection with the sudden stratospheric warming events.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 A possible explanation of the Maunder minimum from a flux transport dynamo model Karak Bidya Binay , Choudhuri Arnab Rai Department of Physics, Indian Institute of Science We propose that the poloidal field at the end of the last sunspot cycle before the Maunder minimum fell to a very low value due to fluctuations in the Babcock--Leighton process and also due to the stochastic fluctuations of meridional circulation. With this assumption, a flux transport dynamo model is able to explain various important features of the historical records of the Maunder minimum (e.g., sudden initiation but gradual recovery, periodic but weaker oscillation and North-South asymmetry observed during the last phase of Maunder minimum) remarkably well on choosing the parameters of the model suitably to give the correct growth time.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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