Mesospheric front observations by the OH airglow imager carried out at Ferraz Station on King George Island, Antarctic Peninsula, in 2011

Giongo, Gabriel Augusto; Bageston, José Valentin; Batista, P. P.; Wrasse, C. M.; Bittencourt, Gabriela Dornelles; Paulino, Igo; Leme, Neusa Maria Paes; Fritts, David C.; Janches, Diego; Hocking, W. K.; Schuch, Nelson Jorge

doi:10.5194/angeo-36-253-2018

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…As earlier mentioned wave patterns observed in airglow can, on occasion, be linked to a strong thunderstorm activity. Most recently, mesospheric fronts have been observed in OH airglow and have been shown to, on some occasions, be related to tropospheric sources like cyclonic activity and large convective cloud cells (Giongo et al, 2018). In fact, for the present study, a strong thunderstorm was registered north of the observed region, at 65.…”

Section: Discussionsupporting

confidence: 45%

“…• Data Set S2 • Movie S1 scattering on particles, which results in different time constants and a much broader altitude range where the waves can be observed. On some occasions, the wave patterns observed in airglow could also be related to tropospheric sources-a strong thunderstorm activity (Taylor & Hapgood, 1988) or a tropospheric front (Brown et al, 2004;Giongo et al, 2018).…”

Section: 1029/2018gl078501mentioning

confidence: 99%

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First Observed Temporal Development of a Noctilucent Cloud Ice Void

Megner

Stegman

Pautet

et al. 2018

Geophysical Research Letters

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Noctilucent clouds are thin ice clouds that appear around the summer polar mesopause.Recently, the Cloud Imaging and Particle Size instrument on the AIM satellite discovered nearly circular ice free regions within the clouds-denoted as "ice voids." The origin of these ice voids is not known. Their existence has so far only been reported by Cloud Imaging and Particle Size, which only can give very limited information of the time scales involved. On 4 July 2010, such an ice void was registered by our ground-based camera taking images with 30-s time interval. We thus here present the first full temporal development of an ice void. Surprisingly, the void did not drift with the prevailing wind as cloud features around it, but instead remained notably stationary for its entire existence of approximately 1 hr. This indicates that that the origin is of stationary character, rather than a rapid change of the local atmosphere.Plain Language Summary Noctilucent clouds are ice clouds that appear high in the atmosphere, about 80 km above the summer pole. By observing them we have learned a lot about the remote and inaccessible region where they form. Recently, a satellite borne instrument discovered nearly circular ice-free regions within the clouds, denoted as "ice voids." The origin of these voids is a mystery-we do not know what causes the clouds to disappear in large circular areas. So far these voids have only been observed from satellites, which only can take pictures of the clouds when they pass above once every 1.5 hr-longer than most ice voids exist. This means that until now we completely lack observations of the development and disappearance of the voids. Here we therefore present the first full temporal development of a void, as observed by our ground-based camera taking images every 30 s. Surprisingly, the void did not drift with the wind as cloud features around it, but it remained notably stationary for approximately 1 hr. These observations give important clues to help us solve the mystery of the origin of these voids-they suggest a steady local heating of the atmosphere as the cause.

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Section: Discussionsupporting

confidence: 45%

Section: 1029/2018gl078501mentioning

confidence: 99%

First Observed Temporal Development of a Noctilucent Cloud Ice Void

Megner

Stegman

Pautet

et al. 2018

Geophysical Research Letters

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“…Sharp propagating fronts of brightness jump or drop that are followed by a train of waves or turbulence have been occasionally observed in mesospheric airglow by ground-based imagers. Since Taylor et al (1995) first reported this type of event over Hawaii, similar wave events have been reported at various locations (e.g., Fechine et al, 2005;Giongo et al, 2018;Li et al, 2013Li et al, , 2019Narayanan et al, 2009;Nielsen et al, 2006;She et al, 2004;Smith et al, 2003Smith et al, , 2005Smith et al, , 2017. Dewan and Picard (1998) explained the Taylor et al (1995) event as a propagating discontinuity in a stable layer or duct, and they named it a mesospheric bore.…”

Section: Introductionmentioning

confidence: 67%

Geographical and Seasonal Variability of Mesospheric Bores Observed from the International Space Station

et al. 2019

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Geographical and seasonal variations of mesospheric bores were derived from mesospheric airglow observations by the Visible and near Infrared Spectral Imager (VISI) of Ionosphere, Mesosphere, upper Atmosphere and Plasmasphere (IMAP) mission onboard the International Space Station. In the three‐year data set spanning September 2012 to August 2015, 306 mesospheric bore events were found between 55ºS and 55ºN in the O2(0‐0) airglow whose peak height is around 95 km. The distribution of the bore events showed a high occurrence at equatorial latitudes especially during the equinox seasons and at winter midlatitudes. These latitudes and seasons are also known for being the place and time where the migrating diurnal and semidiurnal tides have a large temperature amplitude at the upper mesosphere altitude. This coincidence suggests that the majority of mesospheric bores occurred in a temperature inversion layer, which is related to the tides. The local time variation of the bore occurrences at midlatitudes showed a minimum around midnight. The local time variation at equatorial latitudes is more widely distributed compared to those at midlatitudes. The dominant propagation direction of mesospheric bores is from the winter hemisphere to the summer hemisphere.

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“…The spatial resolutions are 13 km along and 12-15 km across the ISS orbit track. The typical phase speed of mesospheric bores is in the range of 60-80 m s −1 (e.g., Taylor et al, 1995;Medeiros et al, 2001;Smith et al, 2003;She et al, 2004;Smith et al, 2005;Nielsen et al, 2006;Narayanan et al, 2009;Fechine et al, 2009;Bageston et al, 2011;Li et al, 2013;Giongo et al, 2018). To the best of our knowledge, the highest bore phase speeds reported in the literature are 98 ± 8 m s −1 (Brown et al, 2004).…”

Section: Instrumentation and Methodologymentioning

confidence: 87%

“…The mesospheric bore model in a thermal duct has been examined and validated using simultaneous lidar and airglow imager observations (Smith et al, 2003(Smith et al, , 2005She et al, 2004). It has been also demonstrated with simultaneous radar observations that wind has an important role in the background condition of mesospheric bores (Fechine et al, 2009;Giongo et al, 2018). Dewan and Picard (2001) provided a possible explanation of mesospheric bores through the critical layer interaction of gravity waves with the mean flow.…”

Section: Introductionmentioning

confidence: 95%

Mesospheric bores at southern midlatitudes observed by ISS-IMAP/VISI: a first report of an undulating wave front

et al. 2018

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Abstract. Large-scale spatial structures of mesospheric bores were observed by the Visible and near-Infrared Spectral Imager (VISI) of the ISS-IMAP mission (Ionosphere, Mesosphere, upper Atmosphere and Plasmasphere mapping mission from the International Space Station) in the mesospheric O2 airglow at 762 nm wavelength. Two mesospheric bore events in southern midlatitudes are reported in this paper: one event at 48–54∘ S, 10–20∘ E on 9 July 2015 and the other event at 35–43∘ S, 24∘ W–1∘ E on 7 May 2013. For the first event, the temporal evolution of the mesospheric bore was investigated from the difference of two observations in consecutive passes. The estimated eastward speed of the bore is 100 m s−1. The number of trailing waves increased with a rate of 3.5 waves h−1. Anticlockwise rotation with a speed of 20∘ h−1 was also recognized. These parameters are similar to those reported by previous studies based on ground-based measurements, and the similarity supports the validity of VISI observation for mesospheric bores. For the second event, VISI captured a mesospheric bore with a large-scale and undulating wave front. The horizontal extent of the wave front was 2200 km. The long wave front undulated with a wavelength of 1000 km. The undulating wave front is a new feature of mesospheric bores revealed by the wide field of view of VISI. We suggest that nonuniform bore propagating speed due to inhomogeneous background ducting structure might be a cause of the undulation of the wave front. Temperature measurements from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) onboard the Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) satellite indicated that bores of both events were ducted in a temperature inversion layer.

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Mesospheric front observations by the OH airglow imager carried out at Ferraz Station on King George Island, Antarctic Peninsula, in 2011

Cited by 8 publications

References 33 publications

First Observed Temporal Development of a Noctilucent Cloud Ice Void

First Observed Temporal Development of a Noctilucent Cloud Ice Void

Geographical and Seasonal Variability of Mesospheric Bores Observed from the International Space Station

Mesospheric bores at southern midlatitudes observed by ISS-IMAP/VISI: a first report of an undulating wave front

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