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Mean vertical profiles for total water and temperature (giving the saturation vapour pressure), appropriate for cloud regime to be simulated
This defines
the spatial scale and organization of the total water anomalies about
the mean atmospheric state
This determines
the magnitude of the total water perturbations.
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 Schematic of
the model. At
each altitude an idealised function is defined in Fourier Space, which
describes the location of total water (vapour +cloud) fluctuations.
This is scaled by the variance equation solving, giving the magnitude
of the fluctuations. By comparing the total water to the
saturation-mixing ratio the cloud water is diagnosed. |
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| EXAMPLES | ||||||||
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Four example input files to generate stratocumulus fields are provided.
In this file the total water mixing ratio, total water variance, temperature and observed liquid water profiles have been generated to represent a radiatively active turbulent cloud layer over a sea surface under a strong subsidence inversion.   Examples of idealised stratocumulus clouds realised with imput data field StCu_A_input.nc with the total quater variability expressed over two different wavelenghts.
This file have been created from real data collected by the Met Office C-130 Hercules aircraft over sea areas near Cornwall (UK) on 22 February 2001 between 12:00UT and 15:00UT. The synoptic situation during the flight (A817) showed low level stratocumulus clouds extending between 450 and 800 m.
Data were collected on September`14 and~22, 2002, during the first field experiment of INSPECTRO which was conducted on the coast of East Anglia, UK. On September~14, a stratocumulus layer was measured between 550 and 1000~m altitude. The measurements on September~22 represent a broken layer case. Most of the clouds were encountered between 900 and 1100~m altitude; the cloud cover measured within this altitude range was about 35%. |
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DOWNLOAD |
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Source: Sitcom-1.2.tar.gz. The code was written by Francesca Di Giuseppe and has been tested on Linux. It is
in C and requires the FFTW (version 3) and NetCDF libraries to be installed. |
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Di Giuseppe
F. and A. M. Tompkins. Effect of
spatial organisation on solar radiative transfer in three dimensional
idealised stratocumulus cloud fields. 2003 J.
Atmos. Sciences, 60, 1774-1794. (pdf)
Di Giuseppe
F. Sensitivity of one-dimensional radiative biases to
vertical cloud-structure assumptions: Validation with aircraft
data. (2005) Quarterly Journal of the Royal Meteorological Society,
131, 1655-1676.(pdf)
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