Role of Tropical Convective Cells in the Observed Middle Atmospheric Gravity Wave Properties from Two Distant Low Latitude Stations

Taori, A.; Raizada, S.; Ratnam, M. Venkat; Tepley, C. A.; Nath, Debashis; Jayaraman, A.

doi:10.5539/esr.v1n1p87

Cited by 6 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…In the mesosphere and lower thermosphere (MLT), Fe Boltzmann lidar, Na resonance fluorescence lidar and K resonance fluorescence lidar are widely used [13,14,17,18]. Accumulated Rayleigh lidar data have been used to investigate the characteristics of GWPED, including in low-latitude [19,20], mid-latitude [21][22][23][24][25][26][27][28][29] and highlatitude regions [30][31][32][33][34][35][36][37][38][39]. GWPED exhibits different characteristics in different regions, such as the magnitude and growth rates of GWPED, the dissipation altitudes and degree of AGWs, and the dependence on seasonal variations.…”

Section: Introductionmentioning

confidence: 99%

Mesospheric Gravity Wave Potential Energy Density Observed by Rayleigh Lidar above Golmud (36.25° N, 94.54° E), Tibetan Plateau

Zhao

Hu²,

Pan³

et al. 2022

Atmosphere

View full text Add to dashboard Cite

Rayleigh lidar data in 2013–2015 is used to describe the characteristics of gravity wave potential energy density in the mesosphere above Golmud (36.25° N, 94.54° E) of the Tibetan Plateau. In this study, the vertical profiles of the atmospheric gravity wave potential energy density between 50–80 km above the region are presented, including the potential energy mass density Epm and the potential energy volume density Epv. It shows the mathematical characteristics of the atmospheric gravity wave potential energy density vertical distribution, which also indicate the gravity waves are obviously dissipated in the lower mesosphere and close to conservative growth in the upper mesosphere (the turning point is around 61 km). A total of 1174 h of data covers seasonal changes, which reveals the seasonal characteristics of the potential energy density. The Epm increases faster with altitude in summer than others. All seasons of the potential energy density profiles show that gravity waves are dissipated in the lower mesosphere, among which spring and winter are the most severe and summer is weakest. The Epm is higher in spring and winter below 55 km. Above 55 km, it is the maximum in winter, followed by summer. Then, the AGWs activities between the location with mid–latitudes and different longitudes are compared and discussed.

show abstract

“…Therefore, in the present report we have taken the data in March-April 2012 and 2014 and April 2013, when the maximum number of cloud-free nights are monitored (e.g., Taori et al, 2012) over Gadanki (13.5 • N; 79.2 • E). To our knowledge for the first time in the Indian sector, we show the gravity wave characteristics together with the reverse-ray-traced sources of these waves.…”

Section: Introductionmentioning

confidence: 99%

Mesospheric gravity wave characteristics and identification of their sources around spring equinox over Indian low latitudes

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. We report OI557.7 nm night airglow observations with the help of a charged-couple device (CCD)-based allsky camera from a low-latitude station, Gadanki (13.5 • N; 79.2 • E). Based on the data collected during March and April over 3 years, from 2012 to 2014 (except March 2013), we characterize the small-scale gravity wave properties. During this period, 50 gravity wave events were detected. The horizontal wavelengths of the gravity waves are found to ranging from 12 to 42 km with the phase velocity 20-90 m s −1 . In most cases, these waves were propagating northward with only a few occurrences of southward propagation. In the present novel investigation from the Indian sector, each of the wave events was reverse-ray-traced to its source. The outgoing longwave radiation (OLR) suggested that tropospheric convection was a possible source for generation of the observed waves. It was found that approximately 66 % of the events were triggered directly by the convection.

show abstract

Role of Tropical Convective Cells in the Observed Middle Atmospheric Gravity Wave Properties from Two Distant Low Latitude Stations

Cited by 6 publications

References 23 publications

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

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

Mesospheric Gravity Wave Potential Energy Density Observed by Rayleigh Lidar above Golmud (36.25° N, 94.54° E), Tibetan Plateau

Mesospheric gravity wave characteristics and identification of their sources around spring equinox over Indian low latitudes

Contact Info

Product

Resources

About