PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 1996-12-01 NOTE = "N/A" END_OBJECT = TEXT END Volume MOGC_0001 Ames Mars General Circulation Model Data Record AAREADME.TXT 01 December 1996 S.W. Lee Laboratory for Atmospheric and Space Physics University of Colorado ================================================================= INTRODUCTION ================================================================= This compact disc contains archival data produced from the Ames General Circulation Model. This data collection is composed of 20 to 30 day averages of the data resulting from model runs simulating martian dust opacity conditions for four Ls periods starting in Earth year 1977 (corresponding to the first Martian year of the Viking missions). Areocentric longitudes included are Ls 10-24, 94-103, 202-220, and 267-286. ================================================================= VOLUME INFORMATION ================================================================= This disc contains six data sets as described below. Each data set is contained in one file: (1) LAT - This data set contains the time and zonally averaged values calculated by the Ames Mars General Circulation Model for the mean surface and sea level pressures and for several of the vertically integrated heat and angular momentum variables. The data are given as a function of latitude. (2) LATLON - This data set contains the instantaneous values for the surface temperature minimum and maximum, and for the amount of CO2 frost on the ground, calculated by the Ames Mars General Circulation Model. The data are given as a function of longitude and latitude. (3) LATPRS - This data set contains the time and zonally averaged values for several first order, heating, eddy, phase and amplitude variables, calculated by the Ames Mars General Circulation Model . The data are given as a function of latitude and vertical pressure. (4) LATTIME - This data set contains the zonally averaged values for the surface temperature mean, calculated by the Ames Mars General Circulation Model. The data are given as a function of latitude and local time. (5) TIME - This data set contains the meridionally and zonally averaged values for the CO2 mass condensation rate, calculated by the Ames Mars General Circulation Model. The data are given as a function of local time. (6) TOPOG - This data set contains the surface topography used by the Ames GCM, obtained from a combination of relevant ground-based and spacecraft data (commonly known as the "Mars Consortium" data set). The data were smoothed for compatibility with the model resolution. The model has 25 latitude bins (7.5 degree resolution) and 40 longitude bins (9.0 degree resolution). This volume follows the structure outlined below: root | |- AAREADME.TXT The file you are reading. | |- ERRATA.TXT Description of known anomalies and | errors present on this volume. | |- VOLDESC.CAT A description of the contents of this | CD_ROM volume in a format readable by | both humans and computers. | |- [CATALOG] A directory containing information | | about the included data sets | | | |- CATINFO.TXT Description of files in this directory. | | | |- COLLECT.CAT Description of this data set collection. | | | |- LAT.CAT Descriptions of the data sets. | |- LATLON.CAT | |- LATPRS.CAT | |- LATTIME.CAT | |- TIME.CAT | |- TOPOG.CAT | | | |- PERS.CAT A listing of the people involved in the | | production of these data sets and | | this CD-ROM. | | | |- REFS.CAT A list of pertinent references. | |- [DATA] A directory containing the data files | and PDS labels describing the contents | of those files. | |- LAT.DAT The LAT data file |- LAT.LBL The PDS label describing LAT | |- LATLON.DAT The LATLON data file |- LATLON.LBL The PDS label describing LATLON | |- LATPRS.DAT The LATPRS data file |- LATPRS.LBL The PDS label describing LATPRS | |- LATTIME.DAT The LATTIME data file |- LATTIME.LBL The PDS label describing LATTIME | |- TIME.DAT The TIME data file |- TIME.LBL The PDS label describing TIME | |- TOPOG.DAT The TOPOG data file |- TOPOG.LBL The PDS label describing TOPOG ================================================================= DISC FORMAT ================================================================= This disk has been formatted so that a variety of computer systems (e.g. IBM PC, Macintosh, Sun, VAX) may access the data. Specifically, the disk is formatted according to the ISO 9660 level 1 Interchange Standard. For further information, refer to the ISO 9660 Standard Document: RF# ISO 9660-1988, 15 April 1988. ================================================================= FILE FORMAT ================================================================= All data files on this disc are accompanied by detached PDS labels, which describe their contents. PDS TEXT objects include attached labels. All PDS labels include an SFDU label in the first record. Labels have the same file name as the primary data file but have a suffix ".LBL" appended. The data files were extracted from the Planetary Atmospheres Node Data Analysis System (PANDA) at the University of Colorado. Each file is ASCII, with the number of records and record structure documented in the associated PDS labels. ================================================================= ACKNOWLEDGMENTS ================================================================= This archiving project was initiated by Steve Lee of the Planetary Data System (PDS) Atmospheres (ATM) Discipline Node (DN) at the University of Colorado. The data were provided by Maureen Bell of Cornell University. The archival products which result from this activity will be delivered to the PDS ATM DN. Assistance in developing the structure of this volume and format of the catalog files was provided principally by Ron Joyner of PDS at JPL. ================================================================= DISCLAIMER ================================================================= Although considerable care has gone into making this volume set, errors are both possible and likely. Users of the data are advised to exercise the same caution as they would when dealing with any other unknown data set. Reports of errors or difficulties would be appreciated. Please contact one of the persons listed below. ================================================================= WHOM TO CONTACT FOR INFORMATION ================================================================= For questions concerning this volume or the data sets and documentation contained herein, contact: Steven W. Lee Laboratory for Atmospheric and Space Physics Campus Box 392 University of Colorado Boulder, CO 80309-0392 Phone: 303-492-5348 Email: lee@syrtis.colorado.edu For questions concerning how to read this CD_ROM or about PDS standards, contact: Jason Hyon MS 525-389 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109 Phone: 818-306-6054 Email: jhyon@jplpds.jpl.nasa.gov