Analysis of Gravity Waves Structures Visible in Noctilucent Cloud Images

2010 ◽  
Author(s):  
P.-D. Pautet ◽  
J. Stegmman ◽  
C. M. Wrasse ◽  
K. Nielsen ◽  
H. Takahashi ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Noctilucent Cloud

scholarly journals A case study of gravity waves in noctilucent clouds

2004 ◽  
Vol 22 (6) ◽  
pp. 1875-1884 ◽  
Author(s):  
P. Dalin ◽  
S. Kirkwood ◽  
A. Moström ◽  
K. Stebel ◽  
P. Hoffmann ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Time Lapse ◽  
Radar Data ◽  
Noctilucent Cloud ◽  
Wave Dynamics ◽  
Complex Wave ◽  
Radar Measurements ◽  
Time Lapse Photography ◽  
Mf Radar

Abstract. We present a case study of a noctilucent cloud (NLC) display appearing on 10-11 August 2000 over Northern Sweden. Clear wave structures were visible in the clouds and time-lapse photography was used to derive the parameters characterising the gravity waves which could account for the observed NLC modulation. Using two nearby atmospheric radars, the Esrange MST Radar data and Andoya MF radar, we have identified gravity waves propagating upward from the upper stratosphere to NLC altitudes. The wave parameters derived from the radar measurements support the suggestion that gravity waves are responsible for the observed complex wave dynamics in the NLC.

Analysis of gravity waves structures visible in noctilucent cloud images

2011 ◽  
Vol 73 (14-15) ◽  
pp. 2082-2090 ◽  
Author(s):  
P.-D. Pautet ◽  
J. Stegman ◽  
C.M. Wrasse ◽  
K. Nielsen ◽  
H. Takahashi ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Noctilucent Cloud

scholarly journals Characteristics and sources of gravity waves observed in NLC over Norway

2013 ◽  
Vol 13 (11) ◽  
pp. 29303-29331
Author(s):  
T. D. Demissie ◽  
P. J. Espy ◽  
N. H. Kleinknecht ◽  
M. Hatlen ◽  
N. Kaifler ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Gravity Waves ◽  
Source Region ◽  
Digital Camera ◽  
Coastal Region ◽  
Primary Source ◽  
Noctilucent Cloud ◽  
The North ◽  
The Waves

Abstract. Four years of noctilucent cloud (NLC) images from an automated digital camera in Trondheim and results from a ray tracing model are used to extend the climatology of gravity waves to higher latitudes and to identify their sources at high latitudes during summertime. The climatology of the summertime gravity-waves detected in NLC between 64° and 74° N is similar to that observed between 60° and 64° N by Pautet et al. (2011). The direction of propagation of gravity waves observed in the NLC north of 64° N is a continuation of the north and northeast propagation as observed in south of 64° N. However, a unique population of fast, short wavelength waves propagating towards the SW is observed in the NLC, which is consistent with transverse instabilities generated in-situ by breaking gravity waves (Fritts et al., 2003). The relative amplitude of the waves observed in the NLC Mie-scatter have been combined with ray-tracing results to show that waves propagating from near the tropopause, rather than those resulting from secondary generation in the stratosphere or mesosphere, are more likely to be the sources of the prominent wave structures observed in the NLC. The coastal region of Norway along the latitude of 70° N is identified as the primary source region of the waves generated near the tropopause.

scholarly journals Characteristics and sources of gravity waves observed in noctilucent cloud over Norway

2014 ◽  
Vol 14 (22) ◽  
pp. 12133-12142 ◽  
Author(s):  
T. D. Demissie ◽  
P. J. Espy ◽  
N. H. Kleinknecht ◽  
M. Hatlen ◽  
N. Kaifler ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Gravity Waves ◽  
Source Region ◽  
Digital Camera ◽  
Coastal Region ◽  
Primary Source ◽  
Noctilucent Cloud ◽  
The North ◽  
The Waves

Abstract. Four years of noctilucent cloud (NLC) images from an automated digital camera in Trondheim and results from a ray-tracing model are used to extend the climatology of gravity waves to higher latitudes and to identify their sources during summertime. The climatology of the summertime gravity waves detected in NLC between 64 and 74° N is similar to that observed between 60 and 64° N by Pautet et al. (2011). The direction of propagation of gravity waves observed in the NLC north of 64° N is a continuation of the north and northeast propagation as observed in south of 64° N. However, a unique population of fast, short wavelength waves propagating towards the SW is observed in the NLC, which is consistent with transverse instabilities generated in situ by breaking gravity waves (Fritts and Alexander, 2003). The relative amplitude of the waves observed in the NLC Mie scatter have been combined with ray-tracing results to show that waves propagating from near the tropopause, rather than those resulting from secondary generation in the stratosphere or mesosphere, are more likely to be the sources of the prominent wave structures observed in the NLC. The coastal region of Norway along the latitude of 70° N is identified as the primary source region of the waves generated near the tropopause.

Waves at the edge of space revealed by noctilucent cloud observations using camera and lidar

2021 ◽  
Author(s):  
Gerd Baumgarten ◽  
J. Federico Conte ◽  
Jens Fiedler ◽  
Michael Gerding ◽  
Franz-Josef Lübken
Keyword(s):  
Gravity Waves ◽  
Radiative Forcing ◽  
Transition To Turbulence ◽  
Small Scale ◽  
High Time Resolution ◽  
Noctilucent Cloud ◽  
Mesopause Region ◽  
Acoustic Gravity Waves ◽  
Global Circulation ◽  
Small Scale Structures

<p>Noctilucent clouds (NLC) exist at an altitude of about 83 km during the summer season at middle and polar latitudes. They consist of icy particles that exist in the polar summer mesopause region where the atmosphere is about 100 K colder than expected from pure radiative forcing. Dynamical effects, for example the dissipation of gravity waves, play an important role in the global circulation finally leading to the cold summer mesopause region. Ever since the first reports on the occurrence of NLC in 1885 the observers noticed distinct structures in the clouds that are most often wave-like. However at times the wave field becomes seemingly chaotic. <br><br>State of the art lidar and camera observations of NLC allow studying small-scale structures of tens of meters in the vertical and horizontal direction. Given a high time resolution (about one second), the development of these structures is measured on temporal scales spanning the range from inertia gravity waves to acoustic gravity waves. We will show observations with the RMR-lidars at ALOMAR (Northern Norway at 69°N) and Kühlungsborn (54°N) as well as cameras located nearby these stations. Using these combined observations we study waves and their transition to turbulence.</p>

Model of the internal gravity waves excited by lithospheric greenhouse effect gases

2001 ◽  
Vol 7 (2s) ◽  
pp. 26-33 ◽  
Author(s):  
O.E. Gotynyan ◽  
◽  
V.N. Ivchenko ◽  
Yu.G. Rapoport ◽  
◽  
...  
Keyword(s):  
Gravity Waves ◽  
Greenhouse Effect ◽  
Internal Gravity Waves
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