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Temporal variation of nonmigrating diurnal tide and its relation with the moist convective activity
Author(s) -
Miyoshi Y.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026072
Subject(s) - convection , atmospheric sciences , thermosphere , troposphere , amplitude , climatology , wavenumber , mesosphere , kelvin wave , divergence (linguistics) , environmental science , geology , ionosphere , geophysics , meteorology , physics , stratosphere , linguistics , philosophy , quantum mechanics , optics
By using a general circulation model, behaviors of the eastward propagating diurnal tide with zonal wavenumber 3 (DE3) and their relation with the convective activity in the tropical troposphere are examined. The amplitude of the DE3 is significant in the equatorial mesosphere and lower thermosphere (MLT). Day‐to‐day variations of the DE3 amplitude are evident in the MLT region, and are closely related with temporal variations of the rainfall rate in the tropics. Estimates of the EP flux divergence due to the DE3 indicate that this convective modulated DE3 activity induces day‐to‐day variations of the wave‐induced driving of the zonal mean zonal wind in the MLT region. Our results show that temporal variations of the zonal mean zonal wind in the equatorial MLT region are influenced by the moist convective activity in the tropics.