Rayleigh Lidar Observations of Thermal Structure and Gravity Wave Activity in the High Arctic during a Stratospheric Warming

Whiteway, J.; Carswell, A. I.

doi:10.1175/1520-0469(1994)051<3122:rloots>2.0.co;2

Cited by 95 publications

(101 citation statements)

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“…These observations suggest that low and high latitude dynamics are coupled. Whiteway and Carswell (1994) observed enhancement of gravity wave activity in the high latitude middle atmosphere during Northern Hemisphere stratospheric warming event. Venkat Ratnam et al (2004) also found enhanced gravity wave activity in the high latitude UTLS region during a Southern Hemisphere stratospheric warming event occurred in the year 2002.…”

Section: Discussionmentioning

confidence: 98%

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

Sridharan

Sathishkumar²

2008

Ann. Geophys.

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Abstract. The Mesosphere and Lower Thermosphere (MLT) winds acquired by medium frequency (MF) radar at Tirunelveli (8.7 • N, 77.8 • E) for the years 1993-2007 are used to study seasonal and interannual variabilities of gravity wave (GW) variances in the altitude region 84-94 km. The GW variances in zonal and meridional winds show semiannual oscillation with maximum variance during March-April and August-September and minimum during June-July and November-December months. The wind variances, in general, are observed to be enhanced during and after the year 1998 and they undergo large interannual variability, in particular, during spring equinox months. An enhancement of GW variances is observed during spring equinox months of the years 2000, 2004 and 2006. These larger GW enhancements, most of the times, coincide with eastward phase of zonally averaged stratospheric QBO at 30 hPa over equator and sudden stratospheric warming occurred at high latitudes. From the zonal and meridional variances, the perturbation ellipses are calculated and they show that the predominant direction of propagation of gravity waves is in SE-NW plane.

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Section: Discussionmentioning

confidence: 98%

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

Sridharan

Sathishkumar²

2008

Ann. Geophys.

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“…Measurements at the South Pole are significantly lower than those at northern high latitudes (Yamashita et al, 2009). It was also found that gravity wave activity is decreased during stratospheric warmings (Whiteway and Carswell, 1994;Blum et al, 2004). This paper presents long-term measurements of gravity wave activity, measured between November and March, over northern Sweden.…”

Section: B Ehard Et Al: Long-term Lidar Observations Of Gravity Wavmentioning

confidence: 90%

“…The longest time series (2002 to 2006) of gravity wave activity measured with lidar was presented by Rauthe et al (2008) who analyzed data from Kühlungsborn, Germany (54 • N, 12 • E). Wilson et al (1991) Whiteway and Carswell (1994), Blum et al (2004), and Taori et al (2012).…”

Section: B Ehard Et Al: Long-term Lidar Observations Of Gravity Wavmentioning

confidence: 99%

Long-term lidar observations of wintertime gravity wave activity over northern Sweden

2014

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Abstract. This paper presents an analysis of gravity wave activity over northern Sweden as deduced from 18 years of wintertime lidar measurements at Esrange (68 • N, 21 • E). Gravity wave potential energy density (GWPED) was used to characterize the strength of gravity waves in the altitude regions 30-40 km and 40-50 km. The obtained values exceed previous observations reported in the literature. This is suggested to be due to Esrange's location downwind of the Scandinavian mountain range and due to differences in the various methods that are currently used to retrieve gravity wave parameters. The analysis method restricted the identification of the dominating vertical wavelengths to a range from 2 to 13 km. No preference was found for any wavelength in this window. Monthly mean values of GW-PED show that most of the gravity waves' energy dissipates well below the stratopause and that higher altitude regions show only small dissipation rates of GWPED. Our analysis does not reproduce the previously reported negative trend in gravity wave activity over Esrange. The observed interannual variability of GWPED is connected to the occurrence of stratospheric warmings with generally lower wintertime mean GWPED during years with major stratospheric warmings. A bimodal GWPED occurrence frequency indicates that gravity wave activity at Esrange is affected by both ubiquitous wave sources and orographic forcing.

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“…They are key parameters for the research and application of atmospheric dynamics and thermodynamics [1,2].…”

Section: Introductionmentioning

confidence: 99%

The Techniques and Progress of Wind and Temperature Lidar in WIPM

Yang

Cheng

et al. 2016

EPJ Web of Conferences

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In this paper, a lidar system in Wuhan Institute of Physics and Mathematics (WIPM, 30.5 o N,114.5 o E) for atmospheric density, temperature and wind observation was reported. The design and techniques of this lidar were described in detail. The atmospheric temperature of the troposphere, stratosphere and lower mesosphere were measured by the Raman, Rayleigh and sodium channel of this lidar system, respectively.

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Rayleigh Lidar Observations of Thermal Structure and Gravity Wave Activity in the High Arctic during a Stratospheric Warming

Cited by 95 publications

References 0 publications

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

Long-term lidar observations of wintertime gravity wave activity over northern Sweden

The Techniques and Progress of Wind and Temperature Lidar in WIPM

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