nerc.ac.uk

Structure, variability, and mean-flow interactions of the January 2015 quasi-two-day wave at middle and high southern latitudes

Fritts, David C.; Iimura, Hiroyuki; Janches, Diego; Lieberman, Ruth S.; Riggin, Dennis M.; Mitchell, Nicholas J.; Vincent, Robert A.; Reid, Iain M.; Murphy, Damian J.; Tsutsumi, Masaki; Kavanagh, Andrew J. ORCID: https://orcid.org/0000-0001-7360-7039; Batista, Paulo P.; Hocking, Wayne K.. 2019 Structure, variability, and mean-flow interactions of the January 2015 quasi-two-day wave at middle and high southern latitudes. Journal of Geophysical Research: Atmospheres, 124 (12). 5981-6008. https://doi.org/10.1029/2018JD029728

Before downloading, please read NORA policies.
[img]
Preview
Text
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
2018JD029728.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

Download (9MB) | Preview

Abstract/Summary

The structure, variability, and mean-flow interactions of the quasi-2-day wave (Q2DW) in the mesosphere and lower thermosphere during January 2015 were studied employing meteor and medium-frequency radar winds at eight sites from 23 degrees S to 76 degrees S and Microwave Limb Sounder (MLS) temperature and geopotential height measurements from 30 degrees S to 80 degrees S. The event had a duration of 20-25 days, dominant periods of 44-52 hr, temperature amplitudes as large as 16 K, and zonal and meridional wind amplitudes as high as 40 and 80 m/s, respectively, at middle and lower latitudes. MLS measurements enabled definition of balance winds that agreed well with radar wind amplitudes and phases at middle latitudes where amplitudes were large and quantification of the various Q2DW modes contributing to the full wave field. The Q2DW event was composed primarily of the westward zonal wavenumber 3 (W3) mode but also had measurable amplitudes in other westward modes W1, W2, and W4; eastward modes E1 and E2; and stationary mode S0. Of the secondary modes, W1, W2, and E2 had the larger amplitudes. Inferred MLS balance winds enabled estimates of the Eliassen-Palm fluxes for each mode, and cumulative zonal accelerations that were found to be in reasonable agreement with radar estimates from 35 degrees S to 70 degrees S at the lower altitudes at which radar winds were available.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1029/2018JD029728
Additional Keywords: quasi-2-day wave, quasi-2-day wave transience, planetary-wave/mean-flow interactions, planetary-wave Eliassen-Palm fluxes
Date made live: 13 Aug 2019 08:20 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/521063

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...