地球惑星科学専攻 地球科学輻合部特別講演会

日時: 2009年10月5日(月) 15:00 - 16:20
場所: 京都大学理学部1号館5階大会議室(563号室)
題目: The predictability of the atmosphere -- is two-dimensional turbulence a good model?
講演者: Dr. Joseph Tribbia (National Center for Atmospheric Research, USA)

講演要旨:
Historically, both two-dimensional and quasi-geostrophic turbulence have
served as paradigms for the behavior of the atmosphere on the large
scale. Both barotropic (2D) and baroclinic (quasi-3D) systems have been
used to understand the nature of the atmospheric energy spectrum and the
flow of information and uncertainty through scale interactions.  Through
the flow of uncertainty, estimates of atmospheric predictability have
been obtained using the inverse cascade of uncertainty inherent in the
dual inviscid constraints of conservation of energy and (potential)
enstrophy common to both 2D and Q-G flows. Despite their similarity with
respect to inviscid constraints, the details of the growth of
uncertainty and the loss of predictability due to small scale errors is
considerably different in 2D and Q-G turbulence and both differ from
more realistic models of the atmosphere in important ways.  My talk will
discuss and analyze the nature of these differences using structures
obtained through non-modal linear analysis techniques.

問い合わせ先: 余田成男