Influence of tides and gravity waves on layering processes in the polar summer mesopause region

Hoffmann, Peter; Rapp, Markus; Fiedler, Jens; Latteck, R.

doi:10.5194/angeo-26-4013-2008

Cited by 27 publications

(22 citation statements)

References 36 publications

(39 reference statements)

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“…The RTI plots indicate most of the well-known features of PMSE, like, e.g., times with a multiple layer structure or the decreasing PMSE intensity between 16:00 to 17:00 UTC, which are common for the Andenes observations. Further, it is possible to see the modulation of the layers within the PMSE due to GW, which is a well-known feature from previous studies (e.g., Rüster et al, 2001;Chilson et al, 2002;Hoffmann et al, 2008;Chen et al, 2008). Based on these observations of the vertical beam we decided to use 83.4 km as the reference height for our wind analysis.…”

Section: Pmse Observations With Maarsymentioning

confidence: 93%

“…It seems to be characteristic for the PMSE that the SNR can drop by more than 10-20 dB within a distance of a few kilometers. As outlined in Hoffmann et al (2008), short-period GW are a likely cause of this high variability inside the PMSE layer. In particular, the up-and downward motion of the lower edge of the PMSE is likely explained by short-period GW.…”

Section: Pmse Observations With Maarsymentioning

confidence: 99%

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Investigation of gravity waves using horizontally resolved radial velocity measurements

et al. 2013

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Abstract. The Middle Atmosphere Alomar Radar System (MAARSY) on the island of Andøya in Northern Norway (69.3 • N, 16.0 • E) observes polar mesospheric summer echoes (PMSE). These echoes are used as tracers of atmospheric dynamics to investigate the horizontal wind variability at high temporal and spatial resolution. MAARSY has the capability of pulse-to-pulse beam steering allowing for systematic scanning experiments to study the horizontal structure of the backscatterers as well as to measure the radial velocities for each beam direction. Here we present a method to retrieve gravity wave parameters from these horizontally resolved radial wind variations by applying velocity azimuth display and volume velocity processing. Based on the observations a detailed comparison of the two wind analysis techniques is carried out in order to determine the zonal and meridional wind as well as to measure first-order inhomogeneities. Further, we demonstrate the possibility to resolve the horizontal wave properties, e.g., horizontal wavelength, phase velocity and propagation direction. The robustness of the estimated gravity wave parameters is tested by a simple atmospheric model.

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Section: Pmse Observations With Maarsymentioning

confidence: 93%

Section: Pmse Observations With Maarsymentioning

confidence: 99%

Investigation of gravity waves using horizontally resolved radial velocity measurements

et al. 2013

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“…It shows measurements of zonal winds, meridional winds and temperatures in the top, middle and lower panels, respectively. These measurements reveal pronounced downward phase progression which is most probably associated with tides Hoffmann et al (2008); Stevens et al (2010); Hultgren et al (2011). Since lidar measurements are weather dependent and there was no luck to have long enough measurements for proper tidal analysis, we further consider wind measurements done by the Saura MF radar which is located close to the launch site (see Sect.…”

Section: Na-lidar and Radar Wind Measurementsmentioning

confidence: 99%

Simultaneous observations of a Mesospheric Inversion Layer and turbulence during the ECOMA-2010 rocket campaign

et al. 2013

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From 19 November to 19 December 2010 the fourth and final ECOMA rocket campaign was conducted at Andøya Rocket Range (69° N, 16° E) in northern Norway. We present and discuss measurement results obtained during the last rocket launch labelled ECOMA09 when simultaneous and true common volume in situ measurements of temperature and turbulence supported by ground-based lidar observations reveal two Mesospheric Inversion Layers (MIL) at heights between 71 and 73 km and between 86 and 89 km. Strong turbulence was measured in the region of the upper inversion layer, with the turbulent energy dissipation rates maximising at 2 W kg⁻¹. This upper MIL was observed by the ALOMAR Weber Na lidar over the period of several hours. The spatial extension of this MIL as observed by the MLS instrument onboard AURA satellite was found to be more than two thousand kilometres. Our analysis suggests that both observed MILs could possibly have been produced by neutral air turbulence

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“…The SAURA MF radar yields, among other things, long-term wind measurements enabling reliable analysis of long-period waves like tides (e.g., Hoffmann et al, 2008Hoffmann et al, , 2010. MAARSY was used to detect mesospheric echoes, which, if present, allow for geophysical parameters to be derived, such as winds and turbulence energy dissipation rates (e.g., Rapp et al, 2011;Latteck et al, 2012).…”

Section: Wadis Projectmentioning

confidence: 99%

Spatial and temporal variability in MLT turbulence inferred from in situ and ground-based observations during the WADIS-1 sounding rocket campaign

et al. 2017

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Abstract. In summer 2013 the WADIS-1 sounding rocket campaign was conducted at the Andøya Space Center (ACS) in northern Norway (69 • N, 16 • E). Among other things, it addressed the question of the variability in mesosphere/lower thermosphere (MLT) turbulence, both in time and space. A unique feature of the WADIS project was multi-point turbulence sounding applying different measurement techniques including rocket-borne ionization gauges, VHF MAARSY radar, and VHF EISCAT radar near Tromsø. This allowed for horizontal variability to be observed in the turbulence field in the MLT at scales from a few to 100 km. We found that the turbulence dissipation rate, ε varied in space in a wavelike manner both horizontally and in the vertical direction. This wavelike modulation reveals the same vertical wavelengths as those seen in gravity waves. We also found that the vertical mean value of radar observations of ε agrees reasonably with rocket-borne measurements. In this way defined ε radar value reveals clear tidal modulation and results in variation by up to 2 orders of magnitude with periods of 24 h. The ε radar value also shows 12 h and shorter (1 to a few hours) modulations resulting in one decade of variation in ε radar magnitude. The 24 h modulation appeared to be in phase with tidal change of horizontal wind observed by SAURA-MF radar. Such wavelike and, in particular, tidal modulation of the turbulence dissipation field in the MLT region inferred from our analysis is a new finding of this work.

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Influence of tides and gravity waves on layering processes in the polar summer mesopause region

Cited by 27 publications

References 36 publications

Investigation of gravity waves using horizontally resolved radial velocity measurements

Investigation of gravity waves using horizontally resolved radial velocity measurements

Simultaneous observations of a Mesospheric Inversion Layer and turbulence during the ECOMA-2010 rocket campaign

Spatial and temporal variability in MLT turbulence inferred from in situ and ground-based observations during the WADIS-1 sounding rocket campaign

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