3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
The publicly available single scattering andradiative transfer codes at IFM-GEOMAR:Example applications from the UV to the
Microwave
Andreas Macke, Ronald Scheirer, Mario Schewski, Steffen Meyer, IngoSchlimme, Susann Klotzsche
Leibniz-Institute for Marine Research, IFM-GEOMARKiel, Germany
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Overview
❑ Single scattering codes (geometric optics)❑ rt.f90: ray-tracing at randomly oriented polyhedral particle
❑ rt-2d.f90: same for horizontal or partly tilted particle orientation
❑ rt-mc.f90: as rt.f90 with internal scattering/absorbing inclusions
❑ rt-ellipsoid.f90: ray-tracing at randomly oriented ellipsoid
❑ rt-raindrop.f90: ray-tracing at rotational symmetric particle defined byChebychef polynomial expansion
❑ Radiative transfer codes (Monte-Carlo)❑ mc-unik.f90: forward Monte-Carlo, estimate for radiance calc.
❑ GRIMALDI: MC package incl. documentation, gas abs., scattering library
❑ 3rad-unik: MC package for 3d microwave and thermal radiative transfer
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Scattering phase functions
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Cirrus Clouds: Solar broadband fluxes- SZA = 65 degree -
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Complete MC package (GRIMALDI)
❑forward scheme to solve radiativetransfer in 3d scattering and absorbingatmosphere with directed (solar)illumination
❑preprocessor for absorptionproperties of atmospheric gases
❑monochromatic and spectral bandfluxes and radiances for finite sizedangular bins
❑photon path length pdf for finite sizedangular bins
❑data base for scattering phasefunctions and single scattering albedosfor spherical and non-spherical cloudparticles
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Forward Local Estimate MC (MC-UNIK)
❑forward scheme to solve radiativetransfer in 3d scattering and absorbingatmosphere with directed (solar)illumination
❑monochromatic fluxes andradiances for discrete directions(Local Estimate scheme)
❑data base for scattering phasefunctions and single scattering albedosfor spherical and non-spherical cloudparticles
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Backward Local Estimate MC (MC-UNIK-BW)
❑backward scheme to solve radiativetransfer in 3d scattering and absorbingatmosphere with directed (solar)illumination
❑monochromatic radiances for discretedirections (Local Estimate scheme)
❑photon pathlength pdf forpredefined viewing geometries andviewing locations
❑data base for scattering phasefunctions and single scattering albedosfor spherical and non-spherical cloudparticles
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Backward MC (3RAD-UNIK)
❑backward scheme to solve radiativetransfer in 3d scattering, absorbing andemitting atmosphere
❑monochromatic radiances for discretedirections
❑preprocessor for gas absorptionfrom the thermal to the microwave
❑data base for scattering phasefunctions and single scattering albedosfor spherical cloud particles
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Codes available at:
http://www.ifm-geomar.de
http://www.ifm-geomar.de/index.php?id=981&L=1
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Orientation of hexagonal columns
Theta_tilt
Klotzsche and Macke (2005), Appl. Opt.
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Reflection
Absorption
Transmission
Solar broadbandradiative fluxesof orientedhexagonal columns
Maximum tilt angle ->
Sola
r zen
ith a
ngle
->
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Θ0 = 150
Θ0 = 750
Θ0 = 600
Θ0 = 450
Θ0 = 300
Tdir+Tdif
R
T =
A
R = ReflectionA = AbsorptionT = Transmission
Solar radiation budget
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
GESIMA: 3d, non-hydrostatic, bulk cloud physicscloud water, rain, ice, snow/graupel
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
Clouds & UV total downward flux
HOM - 3D ICA - 3D
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005
MTG Infrared Sounder Simulator
IR-Sounding from Geostationary Orbit ->Diffraction induced Point Spread Function
3rd I3RC Workshop, IFM-GEOMAR, Octaober 11 – 14 2005