This program collection contains a semi-implicit one-dimensional thermal model for planetary surfaces, an explicit subsurface vapor diffusion and deposition model, models for the equilibrium ice table on Mars, a fast method for subsurface-atmosphere vapor exchange for Mars, a Monte-Carlo model for ballistic hops on the lunar surface, and a 3D model of shadowing, illumination, and scattering.
Group | Filename | Comments | provides |
---|---|---|---|
Basic Models for Planetary Surfaces | |||
Basic Thermal Model | flux_noatm.f90 | Insolation on horizontal or sloped surface without atmosphere | function flux_noatm |
conductionQ.f | 1D thermal conduction with heterogeneous thermal properties and flux/radiation boundary condition, semi-implicit solver | conductionQ | |
tridag.f | from Numerical Recipes (©), without stop and pause statements, NMAX=1000 | tridag | |
asteroid_thermal.f90 | main program | module constants module body main function flux2T | |
oneasteroid_thermal1d.f90 | 1D diffusion of temperture for asteroid | oneasteroid function a2Torb props | |
grids.f | creates appropriate 1D grids, calculates thermal properties of soil with ice | setgrid smartgrid smartgrid_allice soilthprop smartzfac | |
General Purpose | makefile | Example makefile; shows file dependencies | |
psv.f | vapor pressure of H2O | function psv function frostpoint | |
psvco2.f | vapor pressure of CO2 | function psvco2 function tfrostco2 | |
generalorbit.f | distance, longitude, and declination of the sun from orbital elements | generalorbit | |
julday.for | from Numerical Recipes (©), but without the pause statement | function julday | |
derivs.f90 | first and second derivatives on irregular grid | deriv1 deriv2_full deriv2_coeff deriv2 deriv2_simple deriv1_onesided | |
Mars Subsurface Ice Model (M-SIM) | |||
Mars Thermal Model | flux.f | Insolation on horizontal or sloped surface with a poor man's Mars atmosphere | function flux |
marsorbit.f | position of the sun as seen from Mars; data from Allison & McEwen (2000) | marsorbit | |
conductionT.f | 1D thermal conduction with heterogeneous thermal properties and temperature boundary condition, semi-implicit solver | conductionT | |
tprofile.m | Matlab script that compares temperature profile with analytic solution | ||
modeldescription.pdf | Notes on Numerics (see Part 1) | ||
mars_thermal1d.f | 1D diffusion of temperature for Mars; prototype example of how to call conductionQ/T with seasonal CO2 frost cover | main | |
input.par | Example input file for mars_thermal1d.f | ||
Diffusion Model | vapordiffusioni.f | Diffusion of water vapor with phase transitions on irregular grid, explicit solver, (adsorption is turned off) | vapordiffusioni |
adsorption.f | amount of adsorbed H2O and more | adsorption adsorption2 | |
modeldescription.pdf | Notes on Numerics (see Part 2) | ||
exper_thermal1d.f | 1D diffusion of temperature and optionally also vapor with prescribed surface temperature | main | |
exper.par | Example input file for exper_thermal1d.f | ||
Equilibrium Ice Table |
jsub.f | net flux between ice table and surface, includes thermal model | jsub |
jsubv.f90 | vectorized version of jsub, includes emission from one surface to another | jsubv | |
mars_mapi.f | determines equilibrium ice table depth for a list of locations (such as the entire globe); contains leftover Numerical Recipes code (©) | main function rtbis | |
mapgrid.dat | Example input file for mars_mapi.f | ||
mars_mapt2.f | calls jsub for a list of locations (such as the entire globe) | main | |
mars_mapiqh2v.f90 | version of mars_mapi that uses jsubv and slope coupling, configured for cluster | main function rtbis rtbisv | |
Fast Method for Subsurface Ice Dynamics |
fast_modules.f90 | numerically accelerated routines for growth and depletion of subsurfac ice, Fortran modules | module miscparameters module allinterfaces |
fast_subs_univ.f90 | numerically accelerated routines for growth and depletion of subsurface ice, general subroutines |
function zint function colint function equildepth depths_avmeth function constriction icechanges_poreonly icechanges assignthermalproperties compactoutput | |
fast_subs_exper.f90 | numerically accelerated routines for growth and depletion of subsurface ice |
icelayer_exper ajsub_exper outputmoduleparameters module thermalmodelparam_exper | |
fast_subs_mars.f90 | numerically accelerated routines for growth and depletion of subsurface ice |
icelayer_mars ajsub_mars outputmoduleparameters module thermalmodelparam_mars | |
stabgrow_fast.f90 | numerically accelerated growth of pore ice | main icelayer2 ajsub2 | |
exper_fast.f90 | numerically accelerated growth and depletion of subsurface ice | main | |
input_fast.par | Example input file for stabgrow_fast.f90 and exper_fast.f90 | ||
mars_fast.f90 | numerically accelerated growth and depletion of subsurface ice | main | |
lats.ph | Example input file for mars_fast.f90 | ||
Lunar Models | |||
Monte-Carlo Model for Surface-bounded Exosphere |
moon4.f90 | main program; event driven Monte Carlo model for ballistic hops of water molecules on the lunar surface |
module body module exo_species main writegloble function deblank SurfaceTemperature particles2sigma |
montecarlo.f90 | ballistic hops, event scheduler |
hop1 function residence_time function residence_time2 montecarlo production destruction writeparticles totalnrs function incoldtrap | |
subl_subs.f90 | miscellaneous physical parametrizations |
function sublrate function desorptionrate function padsr function sublrate_argon | |
geogrid.f90 | geographic grid |
module grid lonlatgrid function inbox k2lonlat areas | |
gasdev.for | Gaussian probability distribution, Numerical Recipes(©) | function gasdev | |
ran2.for | random number generator, Numerical Recipes(©) | function ran2 | |
Shadowing and illumination |
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shadows.f90 | main program; calculates horizons | main | |
fieldofviews.f90 | main program; calculates horizons and field of views | main | |
cratersQ_snapshot.f90 | main program; instanteneous surface temperature with 3D shadowing and reflections | main | |
cratersQ_moon.f90 | main program; surface temperature with 3D shadowing and reflections | main | |
topos.f90 | input topography information |
module filemanager module filemanager_ll readdem readdem_ll | |
crater_modules.f90 | interface definitions | module allinterfaces | |
crater_common.f90 | common routines |
function horizontaldistance function azimuth function viewing_angle difftopo1 compactoutput | |
shadow_subs.f90 | subroutines for shadows |
findonehorizon function diffangle findonehorizon_wsort | |
fieldofview_subs.f90 | subroutines for fieldofviews |
find3dangle xyz2thetaphi function area_spherical_quadrangle function distanceonsphere refinevisibility | |
model_subs.f90 | subroutines for cratersQ_* |
gethorizon difftopo equatorial2horizontal function flux_wgeom getfieldofview getmaxfieldsize subsurfaceconduction | |
hpsort.for | heapsort, Numerical Recipes(©) | hpsort | |
topo40.xyz | example input topography |
9 Jul 2015: restructered lunar exosphere model, so geographic grid can be swapped out
1 Jun 2015: added 3D model of shadowing and illumination (incl. reflection and thermal emission) on planetary surfaces, unfortunately without any documentation whatsoever; this code is computationally much slower than it could be, but good enough for small topographies
5 Feb 2015: added lunar Monte Carlo model for exospheric transport of water molecules
3/4 Jun 2014: changed NMAX=2000 to NMAX=1000 almost everywhere
31 May 2014: added a few simple routines for thermal modeling of asteroids; reorganized webpage
4 Sep 2011: better implementation of "mode 2" ice growth, affecting fast_subs_mars.f90 and fast_subs_univ.f90
25 Aug 2011: generalizations to mars_fast.f90, fast_modules.f90, and fast_subs_mars.f90
20 Jul 2011: technical updates (generalizations) to grids.f, jsub.f, mars_mapt2.f, and mars_mapi.f
28 Mar 2010: updated fast_subs_mars.f90; icelayer_mars has been parallelized, but parallelization is disabled by default; fewer calls to conductionT in ajsub_mars
27 Mar 2010: minor polish of the very old program mars_thermal1d.f
9 Feb 2010: grids.f has an additional subroutine and the default for the parametrization of thermal conductivity has changed.
4 Feb 2010: From now on, old versions will be archived in directory OldVersions.
2 Jan 2010: routines for fast method have been added. Their filenames contain the string fast.
Summer 2009: switched from g95/g77 to gfortran compiler.
31 Oct 2008: added deriv1_onesided to derivs.f90
2006: Troy Hudson discovered a grid-point offset in conductionT and conductionQ, which has been corrected.
2005: Thanks to Mischa Kreslavsky for providing correct formulas for energy balance on a slope.
Many Thanks to Andy Vaught for developing an open-source Fortran 95 compiler (www.g95.org). The early versions of this code were developed with this compiler.
-NS