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A tropical channel model was constructed to study the long-standing problem of the initiation of the Madden-Julian Oscillation (MJO). Two MJO cases were studied through numerous sensitivity tests. These tests demonstrated that the simulated MJO initiation was critically dependent on the time dependent lateral boundary conditions from the reanalysis. The mechanisms of extratropical influences were further explored, which showed the importance of momentum transport at the lower troposphere and wave activities at the upper troposphere. The dynamics of the MJO and its dependence on the mean state…mehr

Produktbeschreibung
A tropical channel model was constructed to study the
long-standing problem of the initiation of the
Madden-Julian Oscillation (MJO). Two MJO cases were
studied through numerous sensitivity tests. These
tests demonstrated that the simulated MJO initiation
was critically dependent on the time dependent
lateral boundary conditions from the reanalysis. The
mechanisms of extratropical influences were further
explored, which showed the importance of momentum
transport at the lower troposphere and wave
activities at the upper troposphere. The dynamics of
the MJO and its dependence on the mean state were
also studied using multi-year simulation of a nested
regional climate model. In short, this study has
shown that the extratropical influences can be an
efficient mechanism for the MJO initiation and calls
for further research attention to this mechanism that
has been somewhat neglected by mainstream MJO
research. This work should be useful to researchers
in tropical dynamics and thermodynamics and numerical
modeling. It would also be helpful to students who
are studying Meteorology, Atmospheric Sciences, or
Physical Oceanography.
Autorenporträt
Pallav Ray received his Ph.D. in Meteorology and Physical
Oceanography from the Rosenstiel School of Marine and Atmospheric
Sciences, University of Miami, Florida. He utilizes observations,
theory and numerical simulations to study the tropical
ocean-atmosphere system including the Madden-Julian Oscillation.