scholarly journals Measurement of turbulent spatial structure and kinetic energy spectrum by exact temporal-to-spatial mapping

2017 ◽  
Vol 29 (8) ◽  
pp. 085109 ◽  
Author(s):  
Preben Buchhave ◽  
Clara M. Velte
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Spatial Structure ◽  
Spatial Mapping ◽  
Kinetic Energy Spectrum

scholarly journals Calculating Energy Spectra from Drifters

2016 ◽  
Author(s):  
Joseph H. LaCasce
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Structure Function ◽  
Two Dimensions ◽  
Longitudinal Structure ◽  
Kinetic Energy Spectrum ◽  
Longitudinal Structure Function ◽  
Large Pair ◽  
Non Local ◽  
Lagrangian Data

The relations between the kinetic energy spectrum and the second order longitudinal structure function in two dimensions are derived, and several examples are considered. The forward conversion (from spectrum to structure function) is illustrated first with idealized power law spectra, representing turbulent inertial ranges. The forward conversion is also applied to the zonal kinetic energy spectrum of Nastrom and Gage (1985) and the result agrees well with the longitudinal structure function of Lindborg (1999). The inverse conversion (from structure function to spectrum) is tested with data from 2D turbulence simulations. When applied to the theoretical structure function (derived from the forward conversion of the spectrum), the result closely resembles the original spectrum, except at the largest wavenumbers. However the inverse conversion is much less successful when applied to the structure function obtained from pairs of particles in the flow. This is because the inverse conversion favors large pair separations, which are typically noisy with particle data. Fitting the structure function to a polynomial improves the result, but not sufficiently to distinguish the correct inertial range dependencies. Furthermore the inversion of non-local spectra is largely unsuccessful. Thus it appears that focusing on structure functions with Lagrangian data is preferable to estimating spectra.

Kinetic energy spectrum of large-and mesoscale atmospheric processes

Nature ◽  
1984 ◽  
Vol 310 (5972) ◽  
pp. 36-38 ◽  
Author(s):  
G. D. Nastrom ◽  
K. S. Gage ◽  
W. H. Jasperson
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Atmospheric Processes ◽  
Kinetic Energy Spectrum

scholarly journals Comment on "Reinterpreting aircraft measurement in anisotropic scaling turbulence" by Lovejoy et al. (2009)

2010 ◽  
Vol 10 (3) ◽  
pp. 1401-1402 ◽  
Author(s):  
E. Lindborg ◽  
K. K. Tung ◽  
G. D. Nastrom ◽  
J. Y. N. Cho ◽  
K. S. Gage
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
General Circulation ◽  
General Circulation Models ◽  
Measured Spectrum ◽  
Vertical Movements ◽  
Aircraft Measurement ◽  
Kinetic Energy Spectrum ◽  
Anisotropic Scaling ◽  
The 1960S

Abstract. Recently, Lovejoy et al. (2009) argued that the steep ~k−3 atmospheric kinetic energy spectrum at synoptic scales (≥1000 km) observed by aircraft is a spurious artefact of aircraft following isobars instead of isoheights. Without taking into account the earth's rotation they hypothesise that the horizontal atmospheric energy spectrum should scale as k−5/3 at all scales. We point out that the approximate k−3-spectrum at synoptic scales has been observed by a number of non-aircraft means since the 1960s and that general circulation models and other current models have successfully produced this spectrum. We also argue that the vertical movements of the aircraft are far too small to cause any strong effect on the measured spectrum at synoptic scales.

Decrypting the charge-resolved kinetic-energy spectrum in the Coulomb explosion of argon clusters

2012 ◽  
Vol 85 (2) ◽  
Author(s):  
R. Rajeev ◽  
K. P. M. Rishad ◽  
T. Madhu Trivikram ◽  
V. Narayanan ◽  
T. Brabec ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Coulomb Explosion ◽  
Kinetic Energy Spectrum ◽  
Argon Clusters

Kinetic energy spectrum and polarization of neutrons from the reaction 12C(p,n)X at 590 MeV

1998 ◽  
Vol 2 (4) ◽  
pp. 411-415 ◽  
Author(s):  
J. Arnold ◽  
B. van den Brandt ◽  
M. Daum ◽  
M. Finger ◽  
M. Finger ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Kinetic Energy ◽  
Kinetic Energy Spectrum
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