A cooperative synchronous observation of winds and tides in the tropical lower stratosphere and mesosphere using VHF radars at Jicamarca and Arecibo.

Maekawa, Yasunori; Asô, T.; Röttger, J.; Czechowsky, P.; Rüster, R.; Schmidt, Gerhard; Hirota, Isamu; Woodman, R. F.; Kato, S.

doi:10.5636/jgg.38.81

Cited by 8 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They find that diurnal nonmigrating tides have significant amplitudes compared to those of the migrating tide at low and middle latitudes of the upper mesosphere and lower thermosphere. The amplitude profiles calculated using their model for the location corresponding to Arecibo and Jicamarca are found to be somewhat smaller than the observed ones reported by Fukao et al [1980] and Maekawa et al [1986].…”

Section: Resultsmentioning

confidence: 59%

“…Numerical simulations of nonmigrating tides predict short vertical wavelengths (2–5 km) and large amplitudes (1–3 m/s) in the tropical troposphere and lower stratosphere [ Tsuda and Kato , 1989; Lieberman and Leovy , 1995]. VHF radar observations have confirmed the presence of such waves in the tropics [ Sasi et al , 1998; Maekawa et al , 1986; Fukao et al , 1980; Jani et al , 2000].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Seasonal variation of solar tides in the troposphere and lower stratosphere over Gadanki: Comparisons with the global scale wave model

et al. 2002

View full text Add to dashboard Cite

[1] Diurnal cycle hourly horizontal wind measurements by VHF radar in the altitude range of 3 -20 km made at a low-latitude station, Gadanki (13.5°N, 79.2°E), are used to investigate seasonal variation of tidal parameters. The observations are compared with the recent updated version of the global scale wave model (GSWM-2000). Measured amplitudes are found to be much larger than model values, the discrepancy being larger in convective seasons, particularly for zonal winds. Observations suggest superposition of nonmigrating modes on normal migrating tides. The comparison between the observed and model is good in phase behavior, especially for meridional winds. The terdiurnal component is found to have significant amplitude. Energy densities of tidal components become maximum in the upper troposphere and get reduced in the lower stratosphere. However, the seasonal variations deserve further investigation with longer data sets and with a stress on interannual variability.

show abstract

Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Seasonal variation of solar tides in the troposphere and lower stratosphere over Gadanki: Comparisons with the global scale wave model

et al. 2002

View full text Add to dashboard Cite

show abstract

“…VHF radar measurements of lower atmospheric winds in the tropical region also showed similar non-migrating diurnal winds with short vertical wavelength (e.g. Fukao et al, 1980;Maekawa et al, 1986;Sasi et al, 1998). However, many of the observed features of non-migrating diurnal tides in the tropical lower atmosphere cannot be fully accounted for by the numerical models (e.g.…”

Section: Introductionmentioning

confidence: 99%

Tidal wind oscillations in the tropical lower atmosphere as observed by Indian MST Radar

2001

View full text Add to dashboard Cite

Abstract. Diurnal tidal components in horizontal winds measured by MST radar in the troposphere and lower stratosphere over a tropical station Gadanki (13.5 • N, 79.2 • E) are presented for the autumn equinox, winter, vernal equinox and summer seasons. For this purpose radar data obtained over many diurnal cycles from September 1995 to August 1996 are used. The results obtained show that although the seasonal variation of the diurnal tidal amplitudes in zonal and meridional winds is not strong, vertical phase propagation characteristics show significant seasonal variation. An attempt is made to simulate the diurnal tidal amplitudes and phases in the lower atmosphere over Gadanki using classical tidal theory by incorporating diurnal heat sources, namely, solar radiation absorption by water vapour, planetary boundary layer (PBL) heat flux, latent heat release in deep convective clouds and short wave solar radiation absorption by clouds. A comparison of the simulated amplitudes and phases with the observed ones shows that agreement between the two is quite good for the equinox seasons, especially the vertical structure of the phases of the meridional wind components.

show abstract

“…Variations of one aspect or another of the Harper methodology have been employed by numerous investigators for wind and wave studies in the midlatitude MALT region [e.g., Burnside et al, 1983;Roper et al, 1993;Aponte et al, 2005;Gong et al, 2012;Huang et al, 2012]. These include studies that focus on the mesosphere, where the procedure is especially straightforward [Mathews et al, 1981;Rottger et al, 1981;Fukao et al, 1982Fukao et al, , 1985Rottger et al, 1983;Tsuda et al, 1985;Maekawa et al, 1986;Zhou and Morton, 2006]. The techniques and related databases have become sufficiently reliable to support studies of long-term trends over Arecibo [Maekawa et al, 1987;Tepley et al, 2011;Santos et al, 2011;Brum et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

“…These include studies that focus on the mesosphere, where the procedure is especially straightforward [Mathews et al, 1981;Rottger et al, 1981;Fukao et al, 1982Fukao et al, , 1985Rottger et al, 1983;Tsuda et al, 1985;Maekawa et al, 1986;Zhou and Morton, 2006]. The techniques and related databases have become sufficiently reliable to support studies of long-term trends over Arecibo [Maekawa et al, 1987;Tepley et al, 2011;Santos et al, 2011;Brum et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

High time and height resolution neutral wind profile measurements across the mesosphere/lower thermosphere region using the Arecibo incoherent scatter radar

2014

View full text Add to dashboard Cite

Citation:Hysell, D. L., M. F. Larsen, and M. P. Sulzer (2014), High time and height resolution neutral wind profile measurements across the mesosphere/lower thermosphere region using the Arecibo incoherent scatter radar, J. Geophys. Res. Space Physics, 119, 2345-2358, doi:10.1002 Abstract A method for estimating the vector neutral wind profiles in the mesosphere and lower thermosphere (MALT) region of the upper atmosphere from Arecibo dual-beam incoherent scatter radar data is presented. The method yields continuous estimates of both the altitude-averaged F region plasma drifts and all three components of the altitude-resolved neutral wind profiles in the MALT using data taken while the Arecibo feed system swings in azimuth. The problem is mixed determined, and its solution is not inherently unique. Second-order Tikhonov regularization is used to find solutions consistent with the available data while being minimally structured, additional structure being unsupported by the data. The solution is found using the method of conjugate gradient least squares and sparse matrix mathematics. Example data acquired during an interval of midlatitude spread F are used to illustrate the method. The estimated wind profiles exhibit characteristics broadly consistent with gravity waves but are impulsive, with features that generally persist for less than one and a half wave periods.

show abstract

A cooperative synchronous observation of winds and tides in the tropical lower stratosphere and mesosphere using VHF radars at Jicamarca and Arecibo.

Cited by 8 publications

References 31 publications

Seasonal variation of solar tides in the troposphere and lower stratosphere over Gadanki: Comparisons with the global scale wave model

Seasonal variation of solar tides in the troposphere and lower stratosphere over Gadanki: Comparisons with the global scale wave model

Tidal wind oscillations in the tropical lower atmosphere as observed by Indian MST Radar

High time and height resolution neutral wind profile measurements across the mesosphere/lower thermosphere region using the Arecibo incoherent scatter radar

Contact Info

Product

Resources

About