MARS CLIMATE DATABASE v5.0 USER MANUAL - The Mars ...

More documents

Recommendations

Info

Contents1 Introduction 31.1 Available Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 Database scenarios. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3 High resolution mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Contents of the Mars Climate database 43 Installation 53.1 Software Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.2 Installing the MCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Ways to access the database 65 Using the CALL MCD subroutine 75.1 What is the CALL MCD subroutine ? . . . . . . . . . . . . . . . . . . . . . . . . 75.2 Software Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.3 Compiling and running CALL MCD . . . . . . . . . . . . . . . . . . . . . . . . . 95.4 CALL MCD input and output arguments . . . . . . . . . . . . . . . . . . . . . . 105.5 The right use of the CALL MCD subroutine . . . . . . . . . . . . . . . . . . . . . 205.5.1 Perturbed atmospheres . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.5.2 Running time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 Calling the CALL MCD subroutine from IDL 227 Calling the CALL MCD subroutine from Matlab 238 Calling the CALL MCD subroutine from Scilab 239 Calling the CALL MCD subroutine from C or C++ programs 2410 Calling the CALL MCD subroutine from python 2411 High accuracy surface pressure tool pres0 2411.1 How to use pres0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2511.2 Input/output of subroutine pres0 . . . . . . . . . . . . . . . . . . . . . . . . . . 2512 The heights tool 2512.1 Arguments of heights subroutine . . . . . . . . . . . . . . . . . . . . . . . . . 26A Differences Between Version 5.0 and Previous Versions of the MCD 272
1 IntroductionThe Mars Climate Database (MCD) is a database of atmospheric statistics compiled from state-oftheart Global Climate Model (GCM) simulations of the Martian atmosphere.The GCM computes in 3D the atmospheric circulation and climate taking into account radiativetransfer through the gaseous atmospheres and the dust and ice aerosols, includes a representation ofthe CO 2 ice condensation and sublimation on the ground and in the atmosphere, simulates the watercycle (with modelling of cloud microphysics), the dust multisize particle transport, the atmosphericcomposition controlled by the photochemistry and the local non-condensible gas enrichment anddepletion induced by CO 2 condensation and sublimation, and has been extended into the thermosphereand model the ionospheric processes.The models used to compile the statistics have been extensively validated using available observationaldata and represent the current best knowledge of the state of the Martian atmospheregiven the observations and the physical laws which govern the atmospheric circulation and surfaceconditions on the planet.The Mars Climate Database access software add several capabilities to better represent the Martianenvironment variability and accurately compute the surface pressure at high spatial resolution.The MCD is freely available online at request. Its content may also be accessed to make plotsand figures using the interactive server on our WWW site at:http://www-mars.lmd.jussieu.fr1.1 Available Data.The MCD contains several statistics on simulated data stored on a 5.625 ◦ ×3.75 ◦ longitude–latitudegrid from the surface up to an approximate altitude of 300 km: temperature, wind, density, pressure,radiative fluxes, atmosphere composition and gases concentration, CO 2 ice surface layer, statisticson convection, etc...Fields are averaged and stored 12 times a day, for 12 Martian “months” to give a comprehensiverepresentation of the annual and diurnal cycles. Each month covers 30 ◦ in solar longitude (L s ),and is typically 50-70 days long. In other words, at every grid-point, the database contains 12“typical” days, one for each month. In addition, information on the variability of the data withinone month and the day to day oscillations are also stored in the database. Software tools are providedto reconstruct and synthetize this variability (section 5.1).1.2 Database scenarios.Eight combinations of dust and solar scenarios are provided because these are the two forcings thatare highly variable from year to year.• On the one hand, the solar conditions describe variations in the Extreme UV input whichcontrol the heating of the atmosphere above 120 km, which typically varies on a 11 yearscycle. Depending on the scenarios, solar maximum average and/or minimum conditions areprovided.• On the other hand, the major factor which governs the variability in the Martian atmosphereis the amount and distribution of suspended dust. Because of this variability, and since evenfor a given year the details of the dust distribution and optical properties can be uncertain,multi-annual model integrations were carried out for the database assuming various “dustscenarios”, i.e. prescribing various amount of airborne dust in the simulated atmosphere. 4dust scenarios are proposed :1. The “Climatology” (clim) scenario, which is an ensemble average of simulations ranusing the latest version of the LMD Global Climate Model (GCM) forced by the dust3
Page 1: MARS CLIMATE DATABASE v5.0USER MANU
Page 5 and 6: - Detailed Design Document (detaile
Page 7 and 8: e used. The Fortran subroutines use
Page 9 and 10: • The compile file which contains
Page 11 and 12: Table 1: CALL MCD Input argumentsNa
Page 13 and 14: Table 1: CALL MCD Input arguments (
Page 15 and 16: Table 2: CALL MCD output arguments
Page 21 and 22: Table 3: Example of Fortran code to
Page 23 and 24: set the path (the dset variable) to
Page 25 and 26: storm; data corresponding to the Cl
Page 27 and 28: ADifferences Between Version 5.0 an
Page 29: • The main difference between ver

MARS CLIMATE DATABASE v5.0 USER MANUAL - The Mars ...

Create successful ePaper yourself

Delete template?

Save as template?