Radar/Balloon Measurement of Vertical Air Motions Between the Surface and 15 km

Mandel, R. E. De; Krivo, S. J.

doi:10.1175/1520-0450(1971)010<0313:rmovam>2.0.co;2

Cited by 11 publications

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“…Jimsphere retains its shape while minimizing the variation of aerodynamic drag as it ascends and maintains a nearly steady rate of ascent near 5 ms −1 . Jimspheres have been used to derive the vertical air velocity from the ascent rate variations of the balloon with some limitations (De Mandel and Krivo, 1971). These limitations are mainly attributed to the balloon response to the varying buoyant and aerodynamic drag forces.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rate profiles: a wavelet approach

Dolas

Kumar

2009

Ann. Geophys.

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Abstract. In the present communication a novel method is presented to derive the altitude profile of Brunt-Väisälä period from the ascent rate profile of sounding balloons. The basic premise of the present method is that the oscillations in the ascent rate of the balloon will have the signature of Brunt-Väisälä frequency, which can be retrieved by using sophisticated spectral tools. We employ wavelet transforms to arrive at the Brunt-Väisälä period profile. Comparison of retrieved Brunt-Väisälä periods with the values derived from the temperature data available from the same radiosonde ascent shows good agreement. Retrieving the atmospheric temperature from the height profile of Brunt-Väisälä period is also discussed in the present communication. We have shown that it is possible to estimate the Brunt-Väisälä period and temperature profiles from the rawinsonde ascent rate data alone where temperature sounding is not available.

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Section: Introductionmentioning

confidence: 99%

Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rate profiles: a wavelet approach

Dolas

Kumar

2009

Ann. Geophys.

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Gravity wave activity in vertical winds observed by the Poker Flat MST Radar

Ecklund¹,

Gage²,

Riddle³

1981

Geophysical Research Letters

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Over 30 days of nearly continuous observations of the vertical wind up to 20 km obtained using part of the MST radar at Poker Flat, Alaska, are presented in this report. These observations are typical of a longer 6‐month set of observations and demonstrate several new features. The most obvious feature is the extent to which the magnitude of the vertical wind fluctuations is controlled by propagating planetary scale waves, which modulate the large‐scale wind field. Enhanced wind and wind shear in intense baroclinic zones greatly increase gravity wave activity as seen in the vertical winds. Although shorter period fluctuations in vertical velocity on occasion show very regular sinusoidal oscillations with periods from 5 to 30 minutes, typically the vertical velocity fluctuations are irregular with no well‐defined oscillation period. Steady vertical winds of up to 1 m/s lasting for several hours are observed at certain low altitudes when background winds and wind shear are enhanced. The occurrences are not unusual and are probably due to mountain lee wave activity.

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Spectral structure of tropospheric vertical temperature profiles over Cape Kennedy, Florida

Fichtl¹,

Camp

1973

J. Geophys. Res.

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Recent Jimsphere/Jimsonde measurements of tropospheric temperature profile spectra in the wavelength band 50 ≤ λ ≤ 2000 meters above the atmospheric boundary layer, taken over Cape Kennedy, Florida, are summarized. The results suggest that the spectra can be represented in the nondimensional form (ωg/σw)ϕ(k)/σT2 = S(K), where ϕ(k) is the temperature profile spectrum at wave number k, ωg is the Brunt‐Väsälä frequency, σw, and σT denote the standard deviations of the vertical velocity and temperature profiles, and S is a universal function of nondimensional wave number K = kσw/ωg. As K → ∞, the results suggest that S(K) ∼ K−1, whereas, for intermediate values of K ∼ O (10−2), S(K) ∼ K−3.

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Radar/Balloon Measurement of Vertical Air Motions Between the Surface and 15 km

Cited by 11 publications

References 0 publications

Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rate profiles: a wavelet approach

Retrieval of static stability parameter from the radiosonde/rawinsonde ascent rate profiles: a wavelet approach

Gravity wave activity in vertical winds observed by the Poker Flat MST Radar

Spectral structure of tropospheric vertical temperature profiles over Cape Kennedy, Florida

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