Concerning the upper stratospheric gravity wave and mesospheric cloud relationship over Sondrestrom, Greenland

Gerrard, A. J.; Kane, Timothy J.; Thayer, J. P.; Eckermann, Stephen D.

doi:10.1016/j.jastp.2003.12.005

Cited by 23 publications

(50 citation statements)

References 35 publications

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“…This anticorrelation for short period gravity waves has been confirmed by lidar measurements at the South Pole (Chu et al, 2009) and in Sondrestrom, Greenland (Thayer et al, 2003;Gerrard et al, 2004). On the contrary, no such anticorrelation was found in Rothera, Antarctica (Chu et al, 2009), Davis, Antarctica (Innis et al, 2008) and ALOMAR, Norway (Schöch, 2007).…”

Section: Introductionmentioning

confidence: 68%

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Gravity wave influence on NLC: experimental results from ALOMAR, 69° N

Wilms

Rapp

Hoffmann³

et al. 2013

Atmos. Chem. Phys.

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Abstract. The influence of gravity waves on noctilucent clouds (NLC) at ALOMAR (69 • N) is analysed by relating gravity wave activity to NLC occurrence from commonvolume measurements. Gravity wave kinetic energies are derived from MF-radar wind data and filtered into different period ranges by wavelet transformation. From the dataset covering the years 1999-2011, a direct correlation between gravity wave kinetic energy and NLC occurrence is not found, i.e., NLC appear independently of the simultaneously measured gravity wave kinetic energy. In addition, gravity wave activity is divided into weak and strong activity as compared to a 13 yr mean. The NLC occurrence rates during strong and weak activity are calculated separately for a given wave period and compared to each other. Again, for the full dataset no dependence of NLC occurrence on relative gravity wave activity is found. However, concentrating on 12 h of NLC detections during 2008, we do find an NLC-amplification with strong long-period gravity wave occurrence. Our analysis hence confirms previous findings that in general NLC at ALOMAR are not predominantly driven by gravity waves while exceptions to this rule are at least possible.

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Section: Introductionmentioning

confidence: 68%

“…The data is collected with a time resolution of 3 min and is then averaged over 1 h for the following analysis. The uncertainty of the wind velocities is 2 m s −1 (Gonzalez et al, 1994). Gravity wave activity in different period bands is derived by means of a wavelet transformation, as previously applied by Hoffmann et al (2010).…”

Section: Data Basementioning

confidence: 99%

Gravity wave influence on NLC: experimental results from ALOMAR, 69° N

Wilms

Rapp

Hoffmann³

et al. 2013

Atmos. Chem. Phys.

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“…Here we discuss three possible mechanisms: two indirect mechanisms that relate the conditions of the summer polar mesosphere to changes in the gasphase chemistry that could indirectly correlate PMCs with sodium depletions, namely cold summer mesophere temperatures and NaHCO 3 removal, and one direct correlation mechanism that invokes heterogeneous chemistry. Other mechanisms, not pursued in this paper, may also be responsible for the correlation but have yet to be clearly established-for instance, we know that PMC backscatter strength is anticorrelated to gravity wave activity (Gerrard et al, 1998(Gerrard et al, , 2004Thayer et al, 2003), and this dynamical dependence may also impact sodium density behavior in a manner that would correlate sodium density changes with PMC backscatter strength.…”

Section: Discussionmentioning

confidence: 96%

Lidar observations of sodium density depletions in the presence of polar mesospheric clouds

Thayer¹,

Pan²

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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“…From the ∼25 h long set of molecular -aerosol lidar data spanning this time period, it is possible to obtain timeresolved relative atmospheric density perturbations between 30 km and 70 km as outlined in Gerrard et al (1998Gerrard et al ( , 2004b. The density perturbation data (relative to an estimated atmospheric background), available in 5 min by 192 m vertical resolution bins, have been low pass filtered with cutoffs at 2 km in the vertical and 30 min in the temporal.…”

Section: Instrumentation and Analysismentioning

confidence: 99%

Observations of in-situ generated gravity waves during a stratospheric temperature enhancement (STE) event

2011

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Abstract. Evidence for in situ generated atmospheric gravity waves associated with a stratospheric temperature enhancement (STE) are presented. The signatures of two sets of gravity waves are observed by molecular-aerosol lidar in conjunction with the early December 2000 STE event above Sondrestrom, Greenland. The first set of gravity waves shows downward phase progression with a vertical wavelength of ∼8 km while the second set shows upward phase progression with a vertical wavelength of ∼9 km. With estimates of the background wind fields from synoptic analyses, the various intrinsic gravity wave parameters of these two wave structures are found. The observed wave features compare well to previous numerical modeling predictions.

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Concerning the upper stratospheric gravity wave and mesospheric cloud relationship over Sondrestrom, Greenland

Cited by 23 publications

References 35 publications

Gravity wave influence on NLC: experimental results from ALOMAR, 69° N

Gravity wave influence on NLC: experimental results from ALOMAR, 69° N

Lidar observations of sodium density depletions in the presence of polar mesospheric clouds

Observations of in-situ generated gravity waves during a stratospheric temperature enhancement (STE) event

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