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| Titel |
Estimates of turbulent diffusivities and energy dissipation rates from satellite measurements of spectra of stratospheric refractivity perturbations |
| VerfasserIn |
N. M. Gavrilov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 23 ; Nr. 13, no. 23 (2013-12-13), S.12107-12116 |
| Datensatznummer |
250085878
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| Publikation (Nr.) |
 copernicus.org/acp-13-12107-2013.pdf |
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| Zusammenfassung |
| Approaches for estimations of effective turbulent diffusion and energetic
parameters from characteristics of anisotropic and isotropic spectra of
perturbations of atmospheric refractivity, density and temperature are
developed. The approaches are applied to the data obtained with the GOMOS
instrument for measurements of stellar scintillations on-board the Envisat
satellite to estimate turbulent Thorpe scales, LT, diffusivities,
K, and energy dissipation rates, ϵ, in the stratosphere. At
low latitudes, effective values are LT ~ 1–1.1 m,
ϵ ~ (1.8–2.4) × 10−5 W kg−1, and
K ~ (1.2–1.6) × 10−2 m2 s−1 at altitudes of
30–45 km in September–November 2004, depending on different assumed
values of parameters of anisotropic and isotropic spectra. Respective
standard deviations of individual values, including all kinds of variability,
are δLT ~ 0.6–0.7 m,
δϵ ~ (2.3–3.5) × 10−2 W kg−1,
and δK ~ (1.7–2.6) × 10−2 m2 s−1.
These values correspond to high-resolution balloon measurements of turbulent
characteristics in the stratosphere, and to previous satellite stellar
scintillation measurements. Distributions of turbulent characteristics at
altitudes of 30–45 km in low latitudes have maxima at longitudes corresponding
to regions of increased gravity wave dissipation over locations of stronger
convection. Correlations between parameters of anisotropic and isotropic
spectra are evaluated. |
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