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Summer observations of the Martian north polar residual cap by the High Resolution Stereo Camera (HRSC) in 2004/2005 and 2006

Reiss, Dennis and Hoffmann, Harald and Scholten, Frank and Hiesinger, Harald and Matz, Klaus-Dieter and Neukum, Gerhard (2008) Summer observations of the Martian north polar residual cap by the High Resolution Stereo Camera (HRSC) in 2004/2005 and 2006. In: Lunar and Planetary Science XXXIX, 1391. Lunar and Planetary Institute. 39th Lunar and Planetary Science Conference, 10 -14 March, 2008, League City, Texas, USA. ISSN 1540-7845

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Official URL: http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1858.pdf

Abstract

Monitoring the polar caps is impor- tant for understanding the current climate on Mars. The northern residual cap (NRC) is an important source of atmospheric water vapour and it is unclear if there is a net sublimation or deposition of water va- pour under present climatic conditions. The recession of the seasonal polar cap in spring uncovers the bright NRC, which is composed of H2O ice. First obser- vations suggested interannual changes of the NRC in extent. Bass et al showed that these observed changes are most likely due to seasonal variations. Detailed examination of the interior cap showed that the albedo varies spatially but is generally repeatable interannually. Hyperspectral data from OMEGA acquired between LS ~93° and ~127° in 2004/2005 revealed that the albedo decrease on the polar cap is due to the sublimation of fine-grained frost which ex- poses older large-grained ice. In outlying regions, dominated by large-grained ice, the albedo increases with time. We tracked the seasonal and possible interannual albedo changes of the NRC using the Lambert albedo derived from High Resolution Stereo Camera (HRSC) image data of the summer seasons 2004/2005 (LS ~120°-~160°) and 2006 (LS ~90°- ~150).

Item URL in elib:https://elib.dlr.de/67519/
Document Type:Conference or Workshop Item (Poster)
Title:Summer observations of the Martian north polar residual cap by the High Resolution Stereo Camera (HRSC) in 2004/2005 and 2006
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reiss, Dennis Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, GermanyUNSPECIFIED
Hoffmann, Haraldharald.hoffmann (at) dlr.deUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Hiesinger, Harald Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, GermanyUNSPECIFIED
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.deUNSPECIFIED
Neukum, Gerhard Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Ger- manyUNSPECIFIED
Date:2008
Journal or Publication Title:Lunar and Planetary Science XXXIX
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:1391
Publisher:Lunar and Planetary Institute
Series Name:LPI Contribution
ISSN:1540-7845
Status:Published
Keywords:HRSC, Mars, North polar residual cap
Event Title:39th Lunar and Planetary Science Conference
Event Location:League City, Texas, USA
Event Type:international Conference
Event Dates:10 -14 March, 2008
Organizer:Lunar and Planetary Institute
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt MARS-EXPRESS / HRSC (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:06 Jan 2011 13:41
Last Modified:06 Jan 2011 13:41

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