TY - JOUR
T1 - Diurnal nonmigrating tides in the tropical lower thermosphere
AU - Forbes, Jeffrey M.
AU - Hagan, Maura E.
AU - Miyahara, Saburo
AU - Miyoshi, Yasunobu
AU - Zhang, Xiaoli
N1 - Funding Information:
Acknowledgments. This work was supported under NASA Grant NAG5-5028 and NSF Grant ATM-0097829 to the University of Colorado. The algorithm for solving Laplace’s Tidal Equation and generating Table 1 and the curves in Fig. 1 was developed and kindly provided by Prof. Scott E. Palo.
PY - 2003
Y1 - 2003
N2 - A comparison is performed between monthly-mean nonmigrating diurnal tide wind components at 95 km derived from Upper Atmosphere Research Satellite (UARS) wind observations, the Middle Atmosphere Circulation Model at Kyushu University (MACMKU), and the Global Scale Wave Model (GSWM) driven by latent heating due to deep tropical convection. A degree of overall agreement is obtained in the sense that annual-mean spectra at 95 km indicate that the UARS data, MACMKU and GSWM all share the same nonmigrating tide components (eastward-propagating with zonal wavenumber s = -3; westward-propagating with s = -2; standing or zonally-symmetric with s = 0; DE3, DW2, D0) at about the same power level. In combination with the migrating tide these wave components give rise to significant longitude variability in the total diurnal tidal fields. Beyond the above model/measurement agreements, significant discrepancies remain between the latitudinal-seasonal structures delineated by models and observation. For MACMKU, some of these discrepancies may be related to the specifics of the convective parameterization that is employed. Significant work remains to better delineate tropospheric forcing mechanisms and nonlinear wave-wave interactions as sources for nonmigrating tides.
AB - A comparison is performed between monthly-mean nonmigrating diurnal tide wind components at 95 km derived from Upper Atmosphere Research Satellite (UARS) wind observations, the Middle Atmosphere Circulation Model at Kyushu University (MACMKU), and the Global Scale Wave Model (GSWM) driven by latent heating due to deep tropical convection. A degree of overall agreement is obtained in the sense that annual-mean spectra at 95 km indicate that the UARS data, MACMKU and GSWM all share the same nonmigrating tide components (eastward-propagating with zonal wavenumber s = -3; westward-propagating with s = -2; standing or zonally-symmetric with s = 0; DE3, DW2, D0) at about the same power level. In combination with the migrating tide these wave components give rise to significant longitude variability in the total diurnal tidal fields. Beyond the above model/measurement agreements, significant discrepancies remain between the latitudinal-seasonal structures delineated by models and observation. For MACMKU, some of these discrepancies may be related to the specifics of the convective parameterization that is employed. Significant work remains to better delineate tropospheric forcing mechanisms and nonlinear wave-wave interactions as sources for nonmigrating tides.
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U2 - 10.1186/BF03351775
DO - 10.1186/BF03351775
M3 - Article
AN - SCOPUS:20644445016
SN - 1343-8832
VL - 55
SP - 419
EP - 426
JO - earth, planets and space
JF - earth, planets and space
IS - 7
ER -