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https://hdl.handle.net/2440/88883
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Type: | Journal article |
Title: | Low latitude 2-day planetary wave impact on austral polar mesopause temperatures: revealed by a January diminution in PMSE above Davis, Antarctica |
Author: | Morris, R.J. Klekociuk, A.R. Holdsworth, D.A. |
Citation: | Geophysical Research Letters, 2009; 36(11):L11807-1-L11807-6 |
Publisher: | American Geophysical Union |
Issue Date: | 2009 |
ISSN: | 0094-8276 1944-8007 |
Statement of Responsibility: | Ray J. Morris, Andrew R. Klekociuk, and David A. Holdsworth |
Abstract: | [1] A new characteristic of the austral summer polar mesopause as revealed by ground-based radar and satellite temperature measurements is reported, that is linked to inter-annual variability of the low-latitude easterly wind jet. Four consecutive seasons of polar mesosphere summer echoes (PMSE) and mesosphere temperature observations above Davis, Antarctica (68.6°S) show a mid-January diminution in PMSE occurrence rate that coincides with a minor mesopause warming of several degrees. Spectral analyses of PMSE, Aura Microwave Limb Sounder (MLS) temperatures and radar meridional winds show the presence of ∼4–5-day planetary waves (PWs) throughout the austral summer in the polar upper mesosphere together with enhanced ∼2-day PW activity from mid-January to mid-February. Analysis of MLS temperatures show that the ∼2-day PWs have zonal wavenumbers (S) with both westward (S = −2, −3) and eastward (S = +2, +3) components. Although displaying some inter-annual variation in the peak onset time, the mid-January mesopause warming coincides with a weakening of the equatorward meridional wind above Davis and enhancement of low-latitude 2-day PW activity. |
Keywords: | planetary waves; PMSE; mesopause |
Rights: | Copyright 2009 by the American Geophysical Union |
DOI: | 10.1029/2009GL037817 |
Published version: | http://dx.doi.org/10.1029/2009gl037817 |
Appears in Collections: | Aurora harvest 7 Geology & Geophysics publications |
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