An Automated Coordinate Measurement System for Smoke Trail Photographs.

Trowbridge, Christian A.; Andrus, W. Scott

doi:10.21236/ada062485

Cited by 4 publications

(1 citation statement)

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“…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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Section: Introductionmentioning

confidence: 99%

The inertial range “outer scale” and optical turbulence

Dewan

Grossbard

2007

Environ Fluid Mech

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Spectral analysis of 10m resolution scalar velocity profiles in the stratosphere

Dewan¹,

Grossbard²,

Quesada³

et al. 1984

Geophysical Research Letters

109

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Vertical profiles of scalar horizontal winds have been measured at high resolution (10m) in the 13 to 37 km region of the stratosphere. This resolution (at that range of altitude) represents the state‐of‐the‐art, and is unique. Our goal was to ascertain whether or not the internal waves of the stratosphere behave consistently with the Garrett‐Munk model which was originally created for oceanic internal waves. The power spectral densities (PSD's) of five profiles are presented and it is found that (a) they closely fit a straight line on a log‐log graph even to wavelengths as small as 40m, and (b) the average slope is −2.7 ± .2 (standard error = 0.1). We conclude that (a) stratospheric internal waves obey the Garrett‐Munk model for vertical wave numbers, and (b) there is no statistically significant evidence for a break in the curve at high wave numbers when due allowance is made for aliasing effects.

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Identification of Requirements for Atmospheric Data.

Trowbridge¹,

Kofsky²

1981

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An Automated Coordinate Measurement System for Smoke Trail Photographs.

Cited by 4 publications

References 0 publications

The inertial range “outer scale” and optical turbulence

The inertial range “outer scale” and optical turbulence

Spectral analysis of 10m resolution scalar velocity profiles in the stratosphere

Identification of Requirements for Atmospheric Data.

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