Intra‐seasonal variability of polar mesospheric clouds due to inter‐hemispheric coupling

Karlsson, Bodil; Randall, C. E.; Benze, S.; Mills, Michael J.; Harvey, V. Lynn; Bailey, S. M.; Russell, James M.

doi:10.1029/2009gl040348

Cited by 53 publications

(75 citation statements)

References 16 publications

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“…Thus we saw an 8% decrease in the frequency of occurrence in clouds seen in solar occultation by SOFIE near 681N, a factor of two decrease in the ice water content observed by SOFIE and a factor of 5-6 in the number of clouds seen by SHIMMER at sub-arctic latitudes. The 2007 PMC reductions are seen to be linked to SH winter weather as first postulated by Becker et al (2004) and discussed by Karlsson et al (2007Karlsson et al ( , 2009b. This is consistent with earlier reports of such inter-hemispheric teleconnections; our results are the first to use a global analysis of the stratosphere and mesosphere with a cloud formation model to document these effects.…”

Section: Discussionsupporting

confidence: 79%

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Consequences of recent Southern Hemisphere winter variability on polar mesospheric clouds

Siskind

Stevens

Hervig

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Discussionsupporting

confidence: 79%

“…Subsequent work by Karlsson et al (2007Karlsson et al ( , 2009aKarlsson et al ( and 2009b) have shown that these long range teleconnections between the winter in one hemisphere and the summer in the other occur quite often. This effect can be documented for both interannual variability as well as within a single season.…”

Section: Introductionmentioning

confidence: 99%

Consequences of recent Southern Hemisphere winter variability on polar mesospheric clouds

Siskind

Stevens

Hervig

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Becker and Fritts, 2006). Karlsson et al (2009b) observed the effect of this increased summer mesopause temperature in relation to strong winter stratosphere PW activity as well, using polar mesospheric cloud occurrence frequency as a proxy for polar mesopause temperature. However, as this technique can only determine temperature changes in a thin layer, no vertical profiles were shown.…”

Section: Discussionmentioning

confidence: 99%

Coupling in the middle atmosphere related to the 2013 major sudden stratospheric warming

et al. 2015

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Abstract. The previously reported observation of anomalous eastward gravity wave forcing at mesopause heights around the onset of the January 2013 major sudden stratospheric warming (SSW) over Trondheim, Norway (63 • N, 10 • E), is placed in a global perspective using Microwave Limb Sounder (MLS) temperature observations from the Aura satellite. It is shown that this anomalous forcing results in a clear cooling over Trondheim about 10 km below mesopause heights. Conversely, near the mesopause itself, where the gravity wave forcing was measured, observations with meteor radar, OH airglow and MLS show no distinct cooling. Polar cap zonal mean temperatures show a similar vertical profile. Longitudinal variability in the high northern-latitude mesosphere and lower thermosphere (MLT) is characterized by a quasi-stationary wave-1 structure, which reverses phase at altitudes below ∼ 0.1 hPa. This wave-1 develops prior to the SSW onset, and starts to propagate westward at the SSW onset. The latitudinal pole-to-pole temperature structure associated with the major SSW shows a warming (cooling) in the winter stratosphere (mesosphere) which extends to about 40 • N. In the stratosphere, a cooling extending over the equator and far into the summer hemisphere is observed, whereas in the mesosphere an equatorial warming is noted. In the Southern Hemisphere mesosphere, a warm anomaly overlaying a cold anomaly is present, which is shown to propagate downward in time. This observed structure is in accordance with the temperature perturbations predicted by the proposed interhemispheric coupling mechanism for cases of increased winter stratospheric planetary wave activity, of which major SSWs are an extreme case. These results provide observational evidence for the interhemispheric coupling mechanism, and for the wave-mean flow interaction believed to be responsible for the establishment of the anomalies in the summer hemisphere.

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“…This shift represents a typical response time of the summer mesosphere to influences from the winter stratosphere. The underlying wave interactions and propagation times have been discussed by Karlsson et al [2009a] and Körnich and Becker [2010].…”

Section: Discussionmentioning

confidence: 99%

Intra- and inter-hemispheric coupling effects on the polar summer mesosphere

Gumbel

Karlsson

2011

Geophys. Res. Lett.

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The state of the mesosphere is connected to the lower atmosphere through various dynamical coupling processes. Nine years of Odin satellite observations of noctilucent clouds (NLC) have been analyzed as tracers for such processes. Inter‐hemispheric coupling from the winter stratosphere and troposphere is confirmed to have a major influence on the summer mesosphere. Intra‐hemispheric coupling from the spring/summer stratosphere, on the other hand, can control the onset of the NLC season. Most prominently, the southern NLC season 2010–2011 started with a delay of more than 20 days as compared to other years, which coincides with an exceptionally persistent polar vortex in the Antarctic stratosphere. Proposed mechanisms for the above teleconnections are based on the effect of lower atmospheric circulation on gravity wave filtering and, thus, on the dynamical forcing of the mesospheric circulation. Both intra‐ and inter‐hemispheric coupling processes are needed for an understanding of the overall seasonal behavior of the summer mesosphere.

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Intra‐seasonal variability of polar mesospheric clouds due to inter‐hemispheric coupling

Cited by 53 publications

References 16 publications

Consequences of recent Southern Hemisphere winter variability on polar mesospheric clouds

Consequences of recent Southern Hemisphere winter variability on polar mesospheric clouds

Coupling in the middle atmosphere related to the 2013 major sudden stratospheric warming

Intra- and inter-hemispheric coupling effects on the polar summer mesosphere

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