PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 RELEASE_ID = 0001 REVISION_ID = 0000 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2018-12-01 NOTE = "N/A" END_OBJECT = TEXT END MARS Express LEGACY ARCHIVE VOLUME 1. Overview This volume contains Level 4 Data Products, analysed and published in Fedorova, A., Montmessin, F., Korablev, O., Lefevre, F., Trokhimovskiy, A., Bertaux, J. L. (2021). Multi-annual monitoring of the water vapor vertical distribution on Mars by SPICAM on Mars Express. Journal of Geophysical Research: Planets, 126, e2020JE006616. https://doi.org/10.1029/2020JE006616 from observations acquired by the infrared (IR) channel of Spectroscopy for the Investigation of Characteristics of the Atmosphere of Mars (SPICAM) instrument on Mars Express (MEX) in solar occultation. A paper describing the data, the retrieval method and the results can be found in the DOCUMENT subdirectory of this archive volume. The retrieved products are atmospheric profiles of: concentration of water vapour (molecules per cubic centimeter) and its associated error, the volume mixing ratio of water vapor (unitless) and its associated error. One type of SPICAM data products per analysed occultation is archived (in the DATA directory), but the different retrieved parameters, as listed above, are archived in separate files. In the DATA directory, data are stored in files with a detached label. The DATA directory does not contain subdirectories. DATA_SET_ID : "MEX-M-SPI-4-IRDDR-PROF-V1.0" ----------- CONTENTS DESCRIPTION : Atmospheric profiles retrieved from SPICAM IR -------------------- solar occultations in Mars Years 27-34. Data products archived in this volume are reformatted versions of the files provided by A. Fedorova, the corresponding author of Fedorova et al 2021. The data are available as well in the data repository linked to the article: Fedorova, Anna (2020), "Water vapor on Mars from SPICAM IR occultations (MY27-34)", Mendeley Data, V1, doi: 10.17632/vx4gks6bx7.1. The reformatting has been done by MEX Interdisciplinary scientist (IDS) Anni Maattanen. Future Errors and anomalies in the data and comments about the archive will be noted in the ERRATA.TXT file. 2. Archive Volume - Concept of Delivery Within the Planetary Science Archive (PSA) the archive volume represents an online delivery. This might be not fully compliant with the PDS standard 3.6, but the PSA itself can after the end of mission produce fully compatible archive volumes. Deliveries are based on the concept of a release and a revision. This concept allows the delivery of experiment data without the delivery of all supplementary information, that has already been delivered at the first initial delivery of a fully PDS compatible Archive Volume, containing the VOLDESC.CAT file and all necessary CATALOG, DOCUMENT, INDEX, DATA, etc directories and their content. Some PDS labels used in the SPICAM Standard Data Archive are specifically related to the concept of release and revision. A data set release (or volume release) contains data from a well-defined period of time and is identified by the RELEASE_ID(4 digit number : [0001:9999]. A volume release is made of at least one revision : the initial revision. The initial revision contains the initial data of a data set release and is identified by a REVISION_ID equal to 0000. A following revision of the data set release (updated files, supplementary files, deleted files) would need the value of the REVISION_ID incremented by one. A release catalog object need to be included in the catalog object to fully describe the release. The release object contains all keyword-value pairs that are necessary to identify a revision within a release. The DESCRIPTION part of the DATA_SET_RELEASE object will contain the full history of the release including all previous revisions. Each revision of a release is added in the release catalog object and all necessary information about this revision is given by a REVISION object. 3. File Formats This section provides a brief description of the files and data objects available on this MEX Legacy Archive volume: text files, PDF files, and PDS objects. Text and detached PDS label files have stream or fixed-length record format, and line lengths of obligatory 80 characters, including a carriage return (ASCII 13) at the end of the record. This allows the files to be read by MS-DOS/Windows,Unix, and VMS operating systems. Documents that contain formatting and figures that cannot be rendered as ASCII text are provided as PDF files. The PDF (Portable Document Format) file is a proprietary format of Adobe Systems Incorporated a that can be viewed using the free Acrobat Reader software. A PDS detached label provides descriptive information about the associated file. Most of the PDS labels in this Data Archive conform to PDS standards [Planetary Science Data Dictionary, 2001; PDS Standards Reference, 2003]. 4. Science Utilisation The MEX Legacy Archive publishes high-level products derived from the MEX data. The archived high-level datasets have been published in peer-reviewed scientific articles. The references to the publications are given in the documentation of the data volume. The archiving in the MEX Legacy Archive has been made with the consent of the corresponding author and the PI of the instrument. 5. File Naming Convention In this data volume, the data products have been named with the following convention: ORBXXXXXAY_H2O_VMR.TAB or ORBXXXXXAY_H2O_DENSITY.TAB where XXXXX 5 digits for the orbit number Y sequence number indicating the order that data were collected for the XXXXX orbit (A1, A2,...). Examples : ORB18596A2_H2O_VMR.TAB Water vapour volume mixing ratio retrieved from the IR solar occultation acquired during session 2 of the orbit 18596. ORB18596A2_H2O_DENSITY.TAB Water vapour concentration (cm-3) retrieved from the IR solar occultation acquired during session 2 of the orbit 18596. Associated detached label files follow the same file naming convention, but with the .LBL extension. 6. Applicable Software No software is provided in this data volume. 7. Volume Contents Files on this archive volume are organized into a series of subdirectories below the top-level directory, as required by the PSA. See the xxxxINFO.TXT files in each directory for specific information on the files in the directory. The following table shows the generalized structure and contents of this archive volume. Top-level ROOT | |- AAREADME.TXT The file you are reading | |- ERRATA.TXT Description of known anomalies and errors present | on the volume (No yet implemented). | |- VOLDESC.CAT Description of the contents of the volume in a PDS | format for the PDS Catalog. | | |- [DATA] A directory containing the data + associated label files | | |- [CATALOG] A directory containing information about the data set | | | |- CATINFO.TXT Description of files in this directory | | | |- DATASET.CAT Description of the data set | | | |- RELEASE.CAT Release object of the data set | | | |- MISSION.CAT Description of the Mars Express mission | | | |- INSTHOST.CAT Description of the Mars Express spacecraft | | | |- INST.CAT Description of the MEX SPICAM instrument | | | |- PERS.CAT Listing of the people involved in the | | production of this archive volume | |- REFS.CAT List of pertinent references. | | | |- TARGET.CAT Description of the target observed by the | | MEX SPICAM instrument | | | |- SOFTWARE.CAT Description of the software included on the | | volume | |- [INDEX] A directory containing an index of data files. | | | |- INDXINFO.TXT Description of files in this directory. | | | | | |- INDEX.TAB Index of data files in | | the DATA directory | |- INDEX.LBL PDS detached label describing the | | the corresponding *.TAB file | | |- [DOCUMENT] A directory containing information documents. | | | |- DOCINFO.TXT Description of files in this directory. | | | |- SPICAM_ORBITS_H2O_VMR.TAB List of SPICAM occultations | | | |- SPICAM_ORBITS_H2O_VMR.LBL A label describing the TAB file | | | |- SPICAM_ORBITS_H2O_DENS.TAB List of SPICAM occultations | | | |- SPICAM_ORBITS_H2O_DENS.LBL A label describing the TAB file | | | |- FEDOROVA_ET_AL_2021.PDF A preprint describing the data | | | |- FEDOROVA_ET_AL_2021.LBL A label describing the PDF file | | 8. Whom to Contact for Information For questions concerning this data set: Contact Anni MAATTANEN (MEX IDS) or Sebastien BESSE (Lead Archive Scientist). For questions concerning SPICAM, contact F. MONTMESSIN (SPICAM PI). See personnel information in PERS.CAT catalog. 9. Cognizant Persons The archived data were provided by A. Fedorova.