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Titel: Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007
Autor(en): Belova, A.Kirkwood, S.Murtagh, D.Mitchell, N.Singer, W.Hocking, W.
Verlagsversion: https://doi.org/10.5194/angeo-26-3557-2008
URI: https://doi.org/10.34657/1527
https://oa.tib.eu/renate/handle/123456789/4047
Erscheinungsjahr: 2008
Publiziert in: Annales Geophysicae, Volume 26, Issue 11, Page 3557-3570
Verlag: München : European Geopyhsical Union
Abstract: A number of studies have shown that 5-day planetary waves modulate noctilucent clouds and the closely related Polar Mesosphere Summer Echoes (PMSE) at the summer mesopause. Summer stratospheric winds should inhibit wave propagation through the stratosphere and, although some numerical models (Geisler and Dickinson, 1976) do show a possibility for upward wave propagation, it has also been suggested that the upward propagation may in practice be confined to the winter hemisphere with horizontal propagation of the wave from the winter to the summer hemisphere at mesosphere heights causing the effects observed at the summer mesopause. It has further been proposed (Garcia et al., 2005) that 5-day planetary waves observed in the summer mesosphere could be excited in-situ by baroclinic instability in the upper mesosphere. In this study, we first extract and analyze 5-day planetary wave characteristics on a global scale in the middle atmosphere (up to 54 km in temperature, and up to 68 km in ozone concentration) using measurements by the Odin satellite for selected days during northern hemisphere summer from 2003, 2004, 2005 and 2007. Second, we show that 5-day temperature fluctuations consistent with westward-traveling 5-day waves are present at the summer mesopause, using local ground-based meteor-radar observations. Finally we examine whether any of three possible sources of the detected temperature fluctuations at the summer mesopause can be excluded: upward propagation from the stratosphere in the summer-hemisphere, horizontal propagation from the winter-hemisphere or in-situ excitation as a result of the baroclinic instability. We find that in one case, far from solstice, the baroclinic instability is unlikely to be involved. In one further case, close to solstice, upward propagation in the same hemisphere seems to be ruled out. In all other cases, all or any of the three proposed mechanisms are consistent with the observations.
Schlagwörter: baroclinic mode; ground-based measurement; mesopause; Northern Hemisphere; numerical model; planetary wave; polar mesosphere summer echo; polar mesospheric cloud; satellite data; stratosphere; temperature gradient; wave propagation
Publikationstyp: article; Text
Publikationsstatus: publishedVersion
DDC: 530
Lizenz: CC BY 3.0 Unported
Link zur Lizenz: https://creativecommons.org/licenses/by/3.0/
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Belova, A., S. Kirkwood, D. Murtagh, N. Mitchell, W. Singer and W. Hocking, 2008. Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007. 2008. München : European Geopyhsical Union
Belova, A., Kirkwood, S., Murtagh, D., Mitchell, N., Singer, W. and Hocking, W. (2008) “Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007.” München : European Geopyhsical Union. doi: https://doi.org/10.5194/angeo-26-3557-2008.
Belova A, Kirkwood S, Murtagh D, Mitchell N, Singer W, Hocking W. Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007. München : European Geopyhsical Union; 2008.
Belova, A., Kirkwood, S., Murtagh, D., Mitchell, N., Singer, W., & Hocking, W. (2008). Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007 (Version publishedVersion). Version publishedVersion. München : European Geopyhsical Union. https://doi.org/https://doi.org/10.5194/angeo-26-3557-2008
Belova A, Kirkwood S, Murtagh D, Mitchell N, Singer W, Hocking W. Five-day planetary waves in the middle atmosphere from Odin satellite data and ground-based instruments in Northern Hemisphere summer 2003, 2004, 2005 and 2007. Published online 2008. doi:https://doi.org/10.5194/angeo-26-3557-2008


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