Home
News
Publications
Meeting Talks
Reports
Data
Quicklooks
Instruments
Links
Contacts

    

Level 2a Cloudnet product:

Turbulent kinetic energy dissipation rate

Data Home | Overview of Cloudnet products | Product list | Quicklooks | Conditions of use

Summary

Designation
epsilon-sigma-v-bar-method
Level
2a
Algorithm design
Product maintainer
Institute
University of Reading
Description
Turbulent kinetic energy dissipation rate derived from the standard deviation of the 1-s radar Doppler velocities measured every 30 s.
Documentation
See relevant publication
Relevant publication(s)
Bouniol, D., A. J. Illingworth and R. J. Hogan, 2003: Deriving turbulent kinetic energy dissipation rate within clouds using ground based 94 GHz radar. Proc. 31st AMS Conf. on Radar Meteorology, Seattle, 192-196. PDF
(Journal paper in preparation)
Quicklooks
http://www.met.rdg.ac.uk/radar/cloudnet/quicklooks/
Suggested acknowledgement
We acknowledge the Cloudnet project (European Union contract EVK2-2000-00611) for providing the turbulent kinetic energy dissipation rate data, which was produced by the University of Reading using measurements from [SITE].

Dataset contents

Sample NetCDF file: 20030701_chilbolton_epsilon-sigma-v-bar-method.nc
Header of sample NetCDF file in ASCII: 20030701_chilbolton_epsilon-sigma-v-bar-method.cdl

The following is a description of the variables in this product, produced automatically from the metadata in the sample file (using the nc2html unix utility):

Dataset title: Turbulent eddy dissipation rate from Chilbolton

    Institution:Data processed at the Department of Meteorology, University of Reading.

Dimensions and coordinate variables

time
Time UTC
    Units:hours since 2003-07-01 00:00:00 +0:00
    Type:single-precision floating-point vector
height
Height above mean sea level
    Units:m
    Type:single-precision floating-point vector

Variables

latitude
Latitude of site
    Units:degrees_north
    Type:single-precision floating-point scalar
longitude
Longitude of site
    Units:degrees_east
    Type:single-precision floating-point scalar
altitude
Height of radar above mean sea level
    Units:m
    Type:single-precision floating-point scalar
epsilon(time, height)
Turbulent kinetic energy dissipation rate

    This variable was calculated from the 30-s standard deviation of the (approximately) 1-s mean radar Doppler velocities and the horizontal winds from a forecast model using the technique of Bouniol et al. (2003, Proc. 31st AMS Conf. on Radar Meteorology, Seattle).

    Units:m2s-3
    Type:single-precision floating-point array
    Variable containing the random error in epsilon:epsilon_error
epsilon_error(time, height)
Random error in dissipation rate, one standard deviation

    This variable is an estimate of the one-standard-deviation random error in turbulent kinetic energy dissipation rate. It was estimated from the error in model winds (assumed to be 1.5 m s-1) and the random error in the measured standard deviation of Doppler velocity sigma_v (assumed to be sigma_v/sqrt(n), where n is the number of velocity samples used in the calculation, typically between 24 and 30).

    Units:dB
    Type:single-precision floating-point array
These pages are maintained by .