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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.
Klekociuk, A.
Holdsworth, D.
Citation: Geophysical Research Letters, 2009; 36(11):L11807-1-L11807-6
Publisher: American Geophysical Union
Issue Date: 2009
ISSN: 0094-8276
Statement of
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
RMID: 0030020085
DOI: 10.1029/2009GL037817
Appears in Collections:Geology & Geophysics publications

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