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Lagrangian‐Eulerian time‐scale ratios estimated from constant volume balloon flights past a tall tower
Author(s) -
Angell J. K.,
Pack D. H.,
Hoegker W. H.,
Delver N.
Publication year - 1971
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709741108
Subject(s) - turbulence , eulerian path , tower , mechanics , meteorology , planetary boundary layer , volume (thermodynamics) , physics , turbulence kinetic energy , atmospheric sciences , scale (ratio) , constant (computer programming) , geodesy , geology , environmental science , lagrangian , geography , thermodynamics , archaeology , quantum mechanics , computer science , mathematical physics , programming language
The ratio of Lagrangian and Eulerian time scales of motion in the planetary boundary layer is estimated from radar observations of 35 constant volume balloons (tetroons) flown past the 460 m high BREN tower at the Nevada Test Site. On the average, the peak energies of the Eulerian and tetroon vertical velocity spectra occur at periods near 6 and 18 minutes, yielding a mean Lagrangian‐Eulerian scale ratio, β, of about three, β increases with increase in wind speed, decreases with increase in r.m.s. vertical velocity, and is inversely related to vertical turbulence intensity, with β ranging from 4.5 at a turbulence intensity of 0.05 to 2.5 at turbulence intensities exceeding 0.3.