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HF radar observations of a quasi‐biennial oscillation in midlatitude mesospheric winds

dc.contributor.authorMalhotra, Garima
dc.contributor.authorRuohoniemi, J. M.
dc.contributor.authorBaker, J. B. H.
dc.contributor.authorHibbins, R. E.
dc.contributor.authorMcWilliams, K. A.
dc.date.accessioned2017-01-10T19:11:02Z
dc.date.available2018-01-08T19:47:52Zen
dc.date.issued2016-11-16
dc.identifier.citationMalhotra, Garima; Ruohoniemi, J. M.; Baker, J. B. H.; Hibbins, R. E.; McWilliams, K. A. (2016). "HF radar observations of a quasi‐biennial oscillation in midlatitude mesospheric winds." Journal of Geophysical Research: Atmospheres 121(21): 12,677-12,689.
dc.identifier.issn2169-897X
dc.identifier.issn2169-8996
dc.identifier.urihttps://hdl.handle.net/2027.42/135660
dc.description.abstractThe equatorial quasi‐biennial oscillation (QBO) is known to be an important source of interannual variability in the middle‐ and high‐latitude stratosphere. The influence of the QBO on the stratospheric polar vortex in particular has been extensively studied. However, the impact of the QBO on the winds of the midlatitude mesosphere is much less clear. We have applied 13 years (2002–2014) of data from the Saskatoon Super Dual Auroral Radar Network HF radar to show that there is a strong QBO signature in the midlatitude mesospheric zonal winds during the late winter months. We find that the Saskatoon mesospheric winds are related to the winds of the equatorial QBO at 50 hPa such that the westerly mesospheric winds strengthen when QBO is easterly, and vice versa. We also consider the situation in the late winter Saskatoon stratosphere using the European Centre for Medium‐Range Weather Forecasts ERA‐Interim reanalysis data set. We find that the Saskatoon stratospheric winds between 7 hPa and 70 hPa weaken when the equatorial QBO at 50 hPa is easterly, and vice versa. We speculate that gravity wave filtering from the QBO‐modulated stratospheric winds and subsequent opposite momentum deposition in the mesosphere plays a major role in the appearance of the QBO signature in the late winter Saskatoon mesospheric winds, thereby coupling the equatorial stratosphere and the midlatitude mesosphere.Key PointsA significant mesospheric QBO signature is observed at Saskatoon using midlatitude SuperDARN HF radar during late winterSaskatoon MQBO signature is significantly correlated with equatorial QBOFiltering of gravity waves through Saskatoon stratospheric winds and opposite momentum deposition in the mesosphere leads to MQBO
dc.publisherCambridge Univ. Press
dc.publisherWiley Periodicals, Inc.
dc.subject.othermesospheric quasi‐biennial oscillation
dc.subject.othermidlatitude mesosphere and vertical coupling with stratosphere
dc.subject.othergravity wave momentum deposition and vertical coupling
dc.subject.otherSuperDARN radar mesospheric winds
dc.subject.otherinterhemispheric coupling in mesosphere
dc.subject.othermesospheric dynamics
dc.titleHF radar observations of a quasi‐biennial oscillation in midlatitude mesospheric winds
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAtmospheric and Oceanic Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/135660/1/jgrd53414.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/135660/2/jgrd53414_am.pdf
dc.identifier.doi10.1002/2016JD024935
dc.identifier.sourceJournal of Geophysical Research: Atmospheres
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