Determination of Stratospheric Wind Profiles by Digital Analysis.

Trowbridge, Christian A.

doi:10.21236/ada140502

Cited by 2 publications

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confidence: 99%

Winds and shears in the mesosphere and lower thermosphere: Results from four decades of chemical release wind measurements

2002

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[1] Since 1958, over 400 chemical tracer measurements have been made of the wind profiles in the upper mesosphere and lower thermosphere. The measurements cover a wide range of latitudes, longitudes, seasons, and local times. The results from the analysis of the data set show that a wind maximum in the altitude range between 100 and 110 km is a consistent feature of the observations at midlatitudes and low latitudes. The wind speed associated with the maximum exceeds 100 m s À1 in over 60% of the observations. Large shears are found, especially on the bottomside of the wind maximum, and the observed shears are often large enough to be either unstable or approaching instability. The wind maximum and shear features are characteristics of the overall data set and are not tied to particular observation sites, particular seasons, or special conditions. INDEX TERMS: 3369

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confidence: 99%

Winds and shears in the mesosphere and lower thermosphere: Results from four decades of chemical release wind measurements

2002

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“…In all, these profiles provided 45,610 m of wind data. Descriptions and analyses have been published in Dewan et al [5,7], Quesada and Trowbridge [19], Quesada [20], and Trowbridge [33]. These data also included a fifth profile with 20 m resolution which is ignored in the present report.…”

Section: Determination Of Stratospheric Turbulent Layer Thicknesses Fmentioning

confidence: 99%

“…This will be done on the basis of very high-resolution (10 m) measurements that were previously made in the stratosphere. (See [19,20]), and [32,33]). The Tatarski derivation for c 2 n will be described in Sect.…”

Section: Introductionmentioning

confidence: 99%

The inertial range “outer scale” and optical turbulence

Dewan

Grossbard

2007

Environ Fluid Mech

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The crucial parameter used to calculate turbulence effects upon light waves propagating through the atmosphere is known as the structure constant, c 2 n . As Tatarski has shown, this parameter depends upon the "outer scale" of the inertial sub-range of the turbulence. Recently there have been successful predictions of astronomical "seeing" conditions at Mauna Kea Astronomical Observatory which have increased interest in this subject and in the use of the so-called "Dewan Optical Turbulence Model". In the case of the Air Force, there has been a longstanding need for such optical turbulence prediction, especially in the stratosphere. In the past researchers have used a relation due to Tatarski, (which plays a prominent role in this model) in order to deduce values of the "outer scale" from c 2 n measurements. When doing this, they have been surprised to find values very much smaller than expected. The goal of the paper is to explain this unexpected result. As we will show, this result can be explained by two factors: (a) the average turbulent layer thicknesses are smaller than originally believed, and, more importantly, (b) only a minor fraction of the stratosphere is turbulent. In order to arrive at this conclusion, we used the high-resolution (10 m) wind profiles that were originally used to formulate the previously mentioned optical turbulence model.

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Determination of Stratospheric Wind Profiles by Digital Analysis.

Cited by 2 publications

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Winds and shears in the mesosphere and lower thermosphere: Results from four decades of chemical release wind measurements

Winds and shears in the mesosphere and lower thermosphere: Results from four decades of chemical release wind measurements

The inertial range “outer scale” and optical turbulence

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