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キーワード:
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要旨:
An analysis of the dynamic mechanisms relevant for the
North
Atlantic
Oscillation (NAO) is performed based on
the NCAR-NCEP Reanalysis data set. The NAO is mainly driven by transient fluxes, whereby growth and decay
of the NAO-cycle are caused by synoptic waves, which break anticyclonically in the positive phase (negative ano
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maly at Iceland) and cyclonically in the negative phase. The NAO-pattern as well as further teleconnections can be
simulated with a dynamic atmospheric model. Reanalysis data (ERA40) show that the daily NAO variability is
rela ted to the stratospheric circulation.
