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Quasi‐Biennial Oscillation of Short‐Period Planetary Waves and Polar Night Jet in Winter Antarctica Observed in SABER and MERRA‐2 and Mechanism Study With a Quasi‐Geostrophic Model
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2019
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Source: Geophysical Research Letters, 46(22), 13526-13534
[PDF-8.85 MB]
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Journal Title:Geophysical Research Letters
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Description:Analyzing Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) observations from 2003 to 2018, the interannual variability of 2 –5d eastward propagating planetary waves is found to correlate positively with zonal ‐mean zonal winds averaged over 67.5°±10°S but negatively with the quasi ‐biennial oscillation (QBO) index in austral winter. The composite ‐mean wave amplitudes are ~20% larger in QBOe than in QBOw. On statistical average, the poleward flank strengthening and the equatorward flank weakening of polar night jet (PNJ) during QBOe form a dipole ‐cell pattern. In contrast, only a single negative cell is seen in the Northern Hemisphere zonal ‐mean zonal winds (January) previously
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Source:Geophysical Research Letters, 46(22), 13526-13534
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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