Search Results

You are looking at 1 - 10 of 19,210 items for :

  • Spectral distribution x
  • Refine by Access: All Content x
Clear All
Andrew J. Newman
,
Paul A. Kucera
,
Christopher R. Williams
, and
Larry F. Bliven

the radar volume; w represents the mean vertical velocity in the radar sample volume; v represents the Doppler velocity at each spectral point; and * represents the convolution operator. Bragg scattering has been represented as a Gaussian-shaped distribution of turbulent velocities centered on the mean vertical velocity ( Currier et al. 1992 ; Rogers et al. 1993 ; Gossard 1994 ; Rajopadhyaya et al. 1993 , and others). This Gaussian-shaped distribution is given by where σ air 2 is

Full access
Ofer Shamir
,
Chen Schwartz
,
Chaim I. Garfinkel
, and
Nathan Paldor

is integrated for 40 years at a spectral resolution of T42, i.e., a triangular truncation where the highest retained wavenumber and total wavenumber both equal 42, and 40 evenly spaced pressure levels. The time–space analysis is performed on the last 38 years of the integration, after a 2-yr spinup time. d. Shallow-water model simulations To understand the governing mechanism behind the effects of upscale energy cascade on the parity distribution, we use the framework of the forced

Open access
Sabino Metta
,
Jost von Hardenberg
,
Luca Ferraris
,
Nicola Rebora
, and
Antonello Provenzale

below a given minimum threshold to the same value of the transformed variable. This leads to a truncated Gaussian distribution and does not significantly modify the resulting power spectrum. The spectral amplitudes and the initial spectral phases, ϕ ( k x , k y , 0), are determined from the Gaussianized precipitation field at the initial time t = 0. First-order finite differences with the phases at the previous time step, t = −Δ t (this is why we need at least two initial precipitation fields

Full access
G. Kvifte
,
K. Hegg
, and
V. Hansen

JANUARY 1983G.KVIFTE, K. HEGG AND V. HANSEN143Spectral Distribution of Solar Radiation in the Nordic CountriesG. KVIFTE, K. HEoG AND V. HANSENDepartment of Physics and Meteorology, Agricultural University of Norway, 1432 Aas-NLH, Norway(Manuscript received 16 July 1982, in final form 18 October 1982)ABSTRACTIn 1977 a cooperative research project between the Nordic countries (Denmark, Finland, Iceland, Norwayand Sweden) was started. The objective was to chart the spectral distribution of solar

Full access
Jessica M. Kleiss
and
W. Kendall Melville

scales. Banner et al. (2002) and Manasseh et al. (2006) considered scale-dependent breaking rate observations, where the wave scale was determined from collocated wave height data. In this paper, we present spectrally resolved measurements of wave breaking based on the crest length and breaking velocity. Phillips (1985) first suggested using Λ( c ), the distribution of the mean total crest length of breaking waves per unit sea surface area, per unit increment of the breaking velocity c = ( c

Full access
Tian-You Yu
,
Xiao Xiao
, and
Yadong Wang

ratio, which contain information integrated over the radar resolution volume. However, the size of radar resolution volume can be too large. Spectral polarimetry is to combine Doppler and polarimetric measurements so that the distribution of polarimetric variables as a function of radial velocity within the radar resolution volume can be obtained (e.g., Unal et al. 2001 ; Yanovsky 2002 ; Russchenberg et al. 2008 ; Yanovsky 2011 ). The relationship between the commonly used polarimetric variables

Full access
Zongheng Li
,
Jun Peng
,
Lifeng Zhang
, and
Jiping Guan

( Menchaca and Durran 2019 ). Second, the spectrum distribution is related to the model’s resolution and physical parameterizations, especially of convection (vertical motion). The parameterizations involved in representing convection and their effects are important for shaping KE spectra. Malardel and Wedi (2016) further obtained evidence of the impacts of terrain and subgrid parameterization on the KE spectral shape and the nonlinear spectral fluxes at all scales, implying that the parameterizations

Restricted access
Paul R. Julian
,
Warren M. Washington
,
Louis Hembree
, and
Cicely Ridley

376 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLUME27On the Spectral Distribution of Large-Scale Atmospheric Kinetic EnergyPAUL R. JULIAN, WARREI~ M. WASHINGTON, LOUIS HEMBREE,l AND CICELY RIDLEYNational Center for Atmospheri~ Research,~ Bo~der, Colo.(Manu~ript received 24 November 1969)ABSTRACT Current interest in the limits of deterministic prediction in the atmosphere has focused attention on thelongitudinal

Full access
V. Hansen

772JOURNAL OF CLIMATE AND APPLIED METEOROLOGYVOLUME 23Spectral Distribution of Solar Radiation on Clear Days: A Comparison BetweenMeasurements and Model EstimatesV. HANSENDepartment of Physics and Meteorology, Agricultural University of Norway, 1432 Aas-NLH, Norway(Manuscript received IS October 1983, in final fonn 30 January 1984)ABSTRACT-The spectral distribution of the direct solar and scattered sky 'radiation are computed and presented asfunctions of solar height and as integrated daily

Full access
Michael D. King
,
Dale M. Byrne
,
Benjamin M. Herman
, and
John A. Reagan

NOVEMUER1978 KING, BYRNE, HERMAN AND REAGAN 2153Aerosol Size Distributions Obtained by Inversion of Spectral Optical Depth MeasurementsMICHAEL D. KING,TM DALE M. BYRNE,2'~ BENJAMIN M. HERMAN~ AND JOHN A. REAGANaThe University of Arizona, Tucson 85721(Manuscript received .17 February'1978, in final form 15 August 1978)ABSTRACT Columnar aerosol size distributions have been inferred by

Full access