Propagation of short-period gravity waves at high-latitudes during the MaCWAVE winter campaign

Nielsen, Kim; Taylor, Michael J.; Pautet, Pierre-Dominique; Fritts, David C.; Mitchell, N. J.; Beldon, Charlotte L; Williams, B. P.; Singer, W.; Schmidlin, F. J.; Goldberg, R. A.

doi:10.5194/angeo-24-1227-2006

Cited by 27 publications

(32 citation statements)

References 54 publications

(84 reference statements)

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“…Considering the results of the simulations, the MAARSY multi-beam observations are suitable to detect GW with similar properties as observed by Nielsen et al (2006) and Pautet et al (2011). This demonstrates that it should be possible to resolve GW from the radial velocity images and to determine the GW properties.…”

Section: Simulation Of the Quasi-simultaneous Scansmentioning

confidence: 87%

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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: Simulation Of the Quasi-simultaneous Scansmentioning

confidence: 87%

“…Nielsen et al (2006) analyzed short-period gravity waves over Northern Norway using OH, Na and O 2 emission as well as meteor radar wind measurements from Andøya and Esrange. The observed GW showed horizontal wavelengths between 10-42 km and phase speeds of 29-72 m s −1 .…”

Section: Simulation Of the Quasi-simultaneous Scansmentioning

confidence: 99%

Investigation of gravity waves using horizontally resolved radial velocity measurements

et al. 2013

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“…As a GW propagates through this layer, it modulates the line-of-sight brightness and rotational temperature of the airglow emission, which appears as coherent wave structure in sensitive all-sky imaging systems (e.g. Swenson and Mende, 1994;Taylor et al, 1995;Smith et al, 2000;Ejiri et al, 2003;Medeiros et al, 2003;Nielsen et al, 2006). Most of the time the waves appear near linear; however on occasions well-defined concentric rings of GWs are detected over or near severe thunderstorms (Taylor and Hapgood, 1988;Dewan et al, 1998;Sentman et al, 2003;Suzuki et al, 2007;Yue et al, 2008).…”

mentioning

confidence: 99%

Convection: the likely source of the medium-scale gravity waves observed in the OH airglow layer near Brasilia, Brazil, during the SpreadFEx campaign

et al. 2009

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Abstract. Six medium-scale gravity waves (GWs) with horizontal wavelengths of λ H =60-160 km were detected on four nights by Taylor et al. (2009) in the OH airglow layer near Brasilia, at 15 • S, 47 • W, during the Spread F Experiment (SpreadFEx) in Brazil in 2005. We reverse and forward ray trace these GWs to the tropopause and into the thermosphere using a ray trace model which includes thermospheric dissipation. We identify the convective plumes, convective clusters, and convective regions which may have generated these GWs. We find that deep convection is the highly likely source of four of these GWs. We pinpoint the specific deep convective plumes which likely excited two of these GWs on the nights of 30 September and 1 October. On these nights, the source location/time uncertainties were small and deep convection was sporadic near the modeled source locations. We locate the regions containing deep convective plumes and clusters which likely excited the other two GWs. The last 2 GWs were probably also excited from deep convection; however, they must have been ducted ∼500-700 km if so. Two of the GWs were likely downwards-propagating initially (after which they reflected upwards from the Earth's surface), while one of the GWs was likely upwards-propagating initially from the convective plume/cluster. We also estimate the amplitudes and vertical scales of these waves at the tropopause, and compare their scales with those from a simple, linear convection model. Finally, we calculate each GW's dissipation altitude, location, and amplitude. We find that the dissiCorrespondence to: S. L. Vadas (vasha@cora.nwra.com) pation altitude depends sensitively on the winds at and above the OH layer. We also find that several of these GWs may have penetrated to high enough altitudes to potentially seed equatorial spread F (ESF) if located somewhat farther from the magnetic equator.

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“…A merged temperature field compiled from data from multiple instruments during the MaCWAVE winter campaign (see Figure 13) has provided a comprehensive view of the large-and small-scale motions throughout the atmosphere (Williams et al, 2006a). An analysis of the airglow data obtained from ESRANGE revealed a variety of motions ranging from GWs having largely verticall propagating character (in contrast to many previous observations) as well as evidence of significant relatively large-scale instability structures accompanying the strong tidal shears (Nielson et al, 2006), the measured phase structures of which are shown at two times in Figure 14. The analyses surveyed here are now in press in a special MaCWAVE issue of Ann.…”

Section: Dynamics Of the Winter Polar Atmospherementioning

confidence: 97%

Correlative Dynamics Studies Using the Weber Sodium Lidar and Associated Instrumentation at the ALOMAR Observatory

Fritts¹,

She²

2006

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Research Objectives:1. Define the mean and variable structure of the MLT Our objective here was to define the seasonal, inter-annual, and shorter-term variability of the thermal and wind structures throughout the mesosphere and lower thermosphere (MLT). Some of the relevant questions motivating this study include 1) why is the fall transition (increasing mesopause temperature during August) faster than the spring transition, 2) what are the corresponding mean winds and gravity wave momentum fluxes that account for these differences, 3) why is the summer mesopause temperature so stable (or is it?), 4) what is the morphology of mesospheric inversion layers, are there diurnal variations, and how do they depend on gravity wave forcing, and 5) are the strong shears in the lower thermosphere the source of, or the response to, gravity wave instability and momentum transport? These topics were addressed with long-term measurements of the thermal and wind fields over as full a range of altitudes as the Weber lidar and other ALOMAR instrumentation permit (typically ~10 to 105 km for both winds and temperatures). Though full-column measurements were only possible during comprehensive measurement campaigns, Weber lidar measurements spanned a much greater range of times throughout the years of operation. Define the gravity wave coupling from lower altitudes REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

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Propagation of short-period gravity waves at high-latitudes during the MaCWAVE winter campaign

Cited by 27 publications

References 54 publications

Investigation of gravity waves using horizontally resolved radial velocity measurements

Investigation of gravity waves using horizontally resolved radial velocity measurements

Convection: the likely source of the medium-scale gravity waves observed in the OH airglow layer near Brasilia, Brazil, during the SpreadFEx campaign

Correlative Dynamics Studies Using the Weber Sodium Lidar and Associated Instrumentation at the ALOMAR Observatory

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