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Simulations of diurnal tides due to tropospheric heating from the NCEP/NCAR Reanalysis Project
Author(s) -
Forbes Jeffrey M.,
Zhang Xiaoli,
Hagan Maura E.
Publication year - 2001
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 - 10.1029/2001gl013500
Subject(s) - longitude , troposphere , thermosphere , atmospheric sciences , climatology , environmental science , amplitude , wavenumber , madden–julian oscillation , latitude , zonal flow (plasma) , altitude (triangle) , atmospheric tide , geology , ionosphere , meteorology , geodesy , geophysics , convection , physics , plasma , geometry , mathematics , quantum mechanics , optics , tokamak
Diurnal tides are forced in a global‐scale wave model using monthly mean tropospheric heating rates from the NCEP/NCAR Reanalysis Project. The heating rates give rise to a semiannual variation in the migrating (sun‐synchronous) tidal wind response near 95 km altitude with equinoctial maxima (∼50–70 ms −1 ) similar in magnitude to those derived from observational data. Nonmigrating (longitude‐dependent) tides with zonal wavenumbers s=−3 (eastward) to s=+5 (westward) are also generated. Many of these oscillations are characterized by wind and temperature amplitudes of order 20–30 ms −1 and 10–20 K in the lower thermosphere (100–130 km), and suggest that the tidal response in this regime varies considerably with longitude.