Premium
Tropospheric and equatorial influences on planetary‐wave amplitude in the stratosphere
Author(s) -
Hu Yongyun,
Tung Ka Kit
Publication year - 2002
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 - 10.1029/2001gl013762
Subject(s) - stratosphere , extratropical cyclone , troposphere , amplitude , quasi biennial oscillation , wavenumber , forcing (mathematics) , atmospheric sciences , climatology , oscillation (cell signaling) , environmental science , physics , geology , chemistry , optics , quantum mechanics , biochemistry
Using 49‐year NCEP/NCAR reanalysis data we examine two possible factors affecting the amplitudes of extratropical planetary waves in the stratosphere: tropospheric influence and equatorial Quasi‐Biennial Oscillation (QBO) modulation. Our results show that the QBO modulation on wave amplitudes is statistically significant only for wavenumber‐1 in early winter. The variability of wavenumber‐2 amplitude is mainly determined by tropospheric forcing. The effect of the solar cycle on planetary‐wave amplitude is also discussed.