On observation of gravity wave spectra in the atmosphere by using MST radars

Scheffler, A. O.; Liu, C. H.

doi:10.1029/rs020i006p01309

Cited by 60 publications

(26 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6 reveals that the derived spectral slopes under active conditions (left panel) follow a roughly symmetric distribution around a mean of ∼ −5/3 with minimum and maximum values between −8/3 and −2/3. This is consistent with theory and previous studies (e.g., Scheffler and Liu, 1985;Ecklund et al, 1985;Gage et al, 1986). Under quiet conditions (right panel), however, the spectral slopes follow a very asymmetric distribution with a long tail extending towards smaller values with a maximum at around −10/9, which is close to −1.…”

Section: Resultssupporting

confidence: 81%

High-resolution vertical velocities and their power spectrum observed with the MAARSY radar – Part 1: frequency spectrum

Rapp

Stober

et al. 2018

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. The Middle Atmosphere Alomar Radar System (MAARSY) installed at the island of Andøya has been run for continuous probing of atmospheric winds in the upper troposphere and lower stratosphere (UTLS) region. In the current study, we present high-resolution wind measurements during the period between 2010 and 2013 with MAARSY. The spectral analysis applying the Lomb-Scargle periodogram method has been carried out to determine the frequency spectra of vertical wind velocity. From a total of 522 days of observations, the statistics of the spectral slope have been derived and show a dependence on the background wind conditions. It is a general feature that the observed spectra of vertical velocity during active periods (with wind velocity > 10 m s −1 ) are much steeper than during quiet periods (with wind velocity < 10 m s −1 ). The distribution of spectral slopes is roughly symmetric with a maximum at −5/3 during active periods, whereas a very asymmetric distribution with a maximum at around −1 is observed during quiet periods. The slope profiles along altitudes reveal a significant height dependence for both conditions, i.e., the spectra become shallower with increasing altitudes in the upper troposphere and maintain roughly a constant slope in the lower stratosphere. With both wind conditions considered together the general spectra are obtained and their slopes are compared with the background horizontal winds. The comparisons show that the observed spectra become steeper with increasing wind velocities under quiet conditions, approach a spectral slope of −5/3 at a wind velocity of 10 m s −1 and then roughly maintain this slope (−5/3) for even stronger winds. Our findings show an overall agreement with previous studies; furthermore, they provide a more complete climatology of frequency spectra of vertical wind velocities under different wind conditions.

show abstract

Section: Resultssupporting

confidence: 81%

High-resolution vertical velocities and their power spectrum observed with the MAARSY radar – Part 1: frequency spectrum

Rapp

Stober

et al. 2018

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

“…1 show a typical pattern with a peak at the Brunt-Vaisala frequency (Röttger, 1986;Scheffler and Liu, 1985), a steep decrease in amplitude in the high frequency side, and a fairly shallow decrease in amplitude in the low frequency side. Based on earlier studies by Röttger (1986), developed a method for determining tropospheric and lower stratospheric temperature from MST radar observations of vertical wind.…”

Section: Evaluation Of Temperaturementioning

confidence: 99%

Diurnal variation of tropospheric temperature at a tropical station

2001

View full text Add to dashboard Cite

Abstract. The vertical velocity in the troposphere-lower stratosphere region measured using MST radar has been utilized to evaluate the temperature profile in the region. The diurnal variation of the tropospheric temperature on one day in August 1998 at the tropical station Gadanki (13.5 • N, 79.2 • E) has been studied using the MST radar technique. The diurnal variation of the temperature revealed a prominent diurnal variation with the peak in the afternoon hours increasingly delayed in altitude. The tropopause temperature and altitude exhibited a clear diurnal cycle.

show abstract

“…By closely following the procedure in Scheffler and Liu [1985], the observed velocity fluctuation along the beam direction is found to be…”

Section: Gravity Wave Spectra and Variances Observed By Radarmentioning

confidence: 99%

“…Recently, MST radars have been used by many investigators to study the spectra of velocity fluctuations in the middle atmosphere [Balsley and Carter, 1982;Meek et al, 1985;Scheffler and Liu, 1985;Scheffler and Liu, 1986;Smith et al, 1985;Franke et al, 1988, VanZandt, 1985. Attempts have been made by these authors to interpret the observed spectra in terms of internal gravity waves.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimations of model parameters for gravity wave spectra observed by MST radar

Scheffler

Liu

Franke

1990

Advances in Space Research

View full text Add to dashboard Cite

The general theory of MST radar observations of gravity wave spectra is developed in this paper. This effort extends the previous results to include anisotropy and Doppler effects for the spectra, as wellas theconsequencesforthemultibeamconfiguration. The relationships between theobservedone-or two-dimensional spectra fortheline-of-sight velocity inthegravity wave spectra are derived.Expressionsforcrossspectra, as wellas covariancesbetween velocities observedon different beams, arecomputed. Using theseresults, studies arecarded outtoshow how model parametersforgravity wave spectra can be estimatedfrom theobservedquantities. Model parametersincludethe variance, power-law indices, anisotropyparameters, Doppler parameters, mean scale sizes, etc.Caseswithdifferent numbers of beams willbe investigated.

show abstract

On observation of gravity wave spectra in the atmosphere by using MST radars

Cited by 60 publications

References 15 publications

High-resolution vertical velocities and their power spectrum observed with the MAARSY radar – Part 1: frequency spectrum

High-resolution vertical velocities and their power spectrum observed with the MAARSY radar – Part 1: frequency spectrum

Diurnal variation of tropospheric temperature at a tropical station

Estimations of model parameters for gravity wave spectra observed by MST radar

Contact Info

Product

Resources

About