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dc.contributor.authorChau, Jorge L.
dc.contributor.authorUrco, Miguel
dc.contributor.authorAvsarkisov, Victor
dc.contributor.authorVierinen, Juha
dc.contributor.authorLatteck, Ralph
dc.contributor.authorHall, Chris
dc.contributor.authorTsutsumi, Masaki
dc.date.accessioned2019-12-24T08:17:07Z
dc.date.available2019-12-24T08:17:07Z
dc.date.issued2019-12-13
dc.description.abstractWe present and characterize in time and three spatial dimensions a Kelvin‐Helmholtz Instability (KHI) event from polar mesospheric summer echoes (PMSE) observed with the Middle Atmosphere Alomar Radar System. We use a newly developed radar imaging mode, which observed PMSE intensity and line of sight velocity with high temporal and angular resolution. The identified KHI event occurs in a narrow layer of 2.4 km thickness centered at 85 km altitude, is elongated along North‐South direction, presents separation between billows of ~8 km in the East‐West direction, and its billow width is~3 km. The accompanying vertical gradients of the horizontal wind are between 35 and 45 m/s/km and vertical velocities inside the billows are +/‐ 12 m/s. Based on the estimated Richardson (< 0.25), horizontal Froude (~0.8), and buoyancy Reynolds (~2.5 ×10<sup>4</sup>) numbers, the observed event is a KHI that occurs under weak stratification and generates strong turbulence.en_US
dc.identifier.citationChau JL, Urco M, Avsarkisov V, Vierinen J, Latteck R, Hall C M, Tsutsumi M. Four dimensional quantification of Kelvin-Helmholtz instabilities in the polar summer mesosphere using volumetric radar imaging. Geophysical Research Letters. 2019en_US
dc.identifier.cristinIDFRIDAID 1759408
dc.identifier.doihttps://doi.org/10.1029/2019GL086081
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/10037/16988
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.journalGeophysical Research Letters
dc.rights.accessRightsopenAccessen_US
dc.rights.holder©2019 American Geophysical Union. All rights reserved.en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438en_US
dc.titleFour dimensional quantification of Kelvin-Helmholtz instabilities in the polar summer mesosphere using volumetric radar imagingen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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