RT Journal Article
T1 The stratospheric QBO signal in the NCEP reanalysis, 1958-2001
A1 García Herrera, Ricardo Francisco
A1 Calvo Fernández, Natalia
A1 Gallego, David
A1 Hernández Martín, Emiliano
A1 Gimeno, Luis
A1 Ribera, Pedro
A1 Peña Ortiz, Cristina
AB The spatiotemporal evolution of the zonal wind in the stratosphere is analyzed based on the use of the NCEP reanalysis (1958-2001). MultiTaper Method-Singular Value Decomposition (MTM-SVD), a frequency-domain analysis method, is applied to isolate significant spatially-coherent variability with narrowband oscillatory character. A quasibiennial oscillation is detected as the most intense coherent signal in the stratosphere, the signal being less intense in the lower levels. There is a clear downward propagation of the signal with time at low latitudes, not evident at mid and high latitudes. There are differences in the behavior of the signal over both hemispheres, being much weaker over the SH. In the NH an anomaly in the zonal wind field, in phase with the equatorial signal, is detected at approximately 60degreesN. Two different areas at subtropical latitudes are detected to be characterized by wind anomalies opposed to that of the equator.
PB American Geophysical Union
SN 0094-8276
YR 2003
FD 2003-07-08
LK https://hdl.handle.net/20.500.14352/51082
UL https://hdl.handle.net/20.500.14352/51082
LA eng
NO © 2003 by the American Geophysical Union.
DS Docta Complutense
RD 8 abr 2025