2024-03-29T06:22:21Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/GGD283.0012024-02-26T18:16:03Zfgdcv0_otherv0_all
GGD283.001Rock glaciers, Disko Island, GreenlandHumlum, ORock glaciers, Disko Island, Greenland1998-01-01Boulder, Colorado USANSIDC: National Snow and Ice Data Center1false10.7265/ghx6-ja82https://doi.org/10.7265/ghx6-ja82GGD283InvestigatorOleHumlumoleh@unis.no47- 79 02 33 0047- 79 02 33 01P.O. Box 156Longyearbyen9171NorwayEARTH SCIENCECryosphereFrozen GroundPermafrost PERMAFROSTEARTH SCIENCELand SurfaceFrozen GroundPermafrost PERMAFROSTEARTH SCIENCECryosphereFrozen GroundRock Glaciers ROCK GLACIERSEARTH SCIENCELand SurfaceFrozen GroundRock Glaciers ROCK GLACIERSMappingMeteorologyPermafrost PropertiesRock Glaciers69.570.5-55-52ContinentNorth AmericaGreenlandSouthwestern Disko Island, central West GreenlandEnglishFGDCFrozen Ground Data Centerhttp://nsidc.org/fgdc/Data Center ContactFGDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468National Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAFTPASCIIChristiansen, H. H. 1995. Observations of Open System
Pingos in a Marsh Environment, Mellemfjord, Disko, Central West
Greenland. Danish Journal of Geography, 95, 42-48.
Hansen, B. U.; Humlum, O; Nielsen, N.; Rasch, M. and Funch,
P. 1997: Meteorological Observations in 1996 at the Arctic
Station, Qeqertarsuaq (Godhavn), Central West Greenland. Danish
Journal of Geography, Vol.97, 152-153.
Humlum, O. 1982. Rock glacier types on Disko, central West Greenland, Geografisk Tidsskrift, 82, 59-66.
Humlum, O. 1984. Altitudinal trends of talus-derived
lobate rock glaciers on Disko, central West Greenland, XXV.
International Geographical Congress, Royal Danish Geographical
Society, Occasional Papers, 7, 35-39.
Humlum, O. 1987. Glacier behaviour and the influence of
upper-air conditions during the Little Ice Age in Disko, central West Greenland. Danish Journal of Geography, 87, 1-12.
Humlum, O. 1988a. Rock glacier appearance level and rock
glacier initiation line altitude: a methodological approach to
the study of rock glaciers, Arctic and Alpine Research, 20, 160-178.
Humlum, O. 1988b. Natural cairns on rock glaciers as an indication of a solid ice core, Geografisk Tidsskrift, 88, 78-82.
Humlum, O. 1992. Observations on Rock Moisture Variability
in Gneiss and Basalt under Natural, Arctic Conditions.
Geografiska Annaler, 74A, 197-205.
Humlum, O. 1996. Origin of Rock Glaciers: Observations
from Mellemfjord, Disko Island, central West Greenland,
Permafrost and Periglacial Processes, 7, 361-380.
Humlum, O. 1997. Active Layer Thermal Regime at three Rock
Glaciers in Greenland. Permafrost and Periglacial Processes,
Vol.8, p. 383-408.
Humlum, O., Christiansen, H. H., Hansen, B. U., Hasholt, B.,
Jakobsen, B. H., Nielsen, N. and Rasch, M. 1995. Holocene
Landscape Evolution in the Mellemfjord Area, Disko Island,
Central West Greenland: Area Presentation and Preliminary
Results. Danish Journal of Geography, 95, 28-41.
Humlum, O.; Nielsen, N. and Hansen, B. U. 1996:
Meteorological Observations in 1995 at the Arctic Station,
Qeqertarsuaq (Godhavn), Central West Greenland. Danish Journal of
Geography, 96:119-122.
Nielsen, N.; Humlum, O.; Hansen, B. U.; and M. Rasch. 1995:
Meteorological observations at Arctic Station, Qeqertarsuaq
(Godhavn), Central West Greenland. Danish Journal of Geography,
95:97-104.
Rasch, M. and Nielsen, N., 1994: Holocene relative
sea-level changes indicated by morphostratigraphic sequences; Signifik, Disko Island, West Greenland. Danish Journal of
Geography, 94: 37-45.
Rasch, M. and Nielsen, N., 1995: Coastal
morpho-stratigraphy and Holocene relative sea level changes at
Tuapaat, southeastern Disko Island, central West Greenland.
Polar Research, 14: 277-289.
Rasch, M., Christiansen, H. H., Hansen, B. U., Hasholt, B.,
Humlum, O., Jakobsen, B. H. and Nielsen, N. 1996. Greenland Landscape Elements as Indicators of Rapid Environmental Change.
In: Geoindicators: Assessing Rapid Environmental Changes in
Earth Systems, Berger, A.R. and Iams, W.J. (eds.) Balkema
Publishers, Holland, p. 69-92.
Weidick, A. 1968. Observations on some Holocene glacier
fluctuations in West Greenland. Meddelelser om Grnland, 164(6), 202p.Disko Island (8600 km2) is situated west of central mainland Greenland. The island is part of the Tertiary volcanic province of West Greenland and is mainly made up by lavas. The landscape is a plateau basalt landscape with cirque carved lava plateaus and U-shaped valleys and fjords. Rock glaciers are frequent in Disko Island (Humlum, 1982). In southern Disko Island, about 60 km SSE of the two study sites, meteorological observations have been carried out since 1923 in the village of Godhavn. The present (1961-1990) mean annual air temperature is -3.9 C, the coldest month is March (-15.1 C), and July is the warmest month (7.1 C). The mean annual precipitation at Godhavn is about 400 mm water equivalent. Most of the precipitation (75 %) usually falls during the period June to December, associated with advection of moist, maritime air masses from the south and southwest along the Davis Strait. The remaining part of the year is comparatively dry, as it is dominated by cold and dry katabatic air masses flowing off the Greenland Ice Sheet to the east. Approximately 60-70 % of the mean annual precipitation is snow and in Godhavn a persistent snow cover is registered from late September to late May.
No systematic mapping of permafrost or permafrost related terrain features have been carried out in this part of West Greenland. Weidick (1968), however, places Disko Island within the zone of continuous permafrost. This is supported by the occurrence of open system pingos (Christiansen, 1995) and numerous rock glaciers (Humlum, 1982, 1984, 1988a, 1988b, 1996; Humlum et al., 1995; Rasch et al. 1996), which are geomorphic indications of the presence of widespread permafrost in Disko Island. Adopting a standard continental geothermal gradient of about 0.033 C m-1, the mean annual air temperature of -7.5 C (1991-96) indicates a potential permafrost thickness of about 175-225 m. This estimate is presumably somewhat conservative, as the Little Ice Age annual air temperature presumably was about 2C below modern values (Humlum, 1996), which would provide conditions for a somewhat thicker permafrost layer than is suggested by modern meteorological values. The high frequency of rock glaciers on Disko Island is presumably derived from high rock weathering rates (Humlum, 1992). These data are presented on the CAPS Version 1.0 CD-ROM, June
1998.VIEW RELATED INFORMATIONhttps://doi.org/10.7265/ghx6-ja82DocumentationGET DATAftp://sidads.colorado.edu/pub/DATASETS/fgdc/ggd283_rockglac_greenland/FTPCEOS IDN DIFVERSION 9.91998-01-012024-02-26NSIDCVersion SummaryNSIDCMinor VersionNSIDCCurrent Version1NSIDCLevel of ServiceBasicNSIDCFull Dataset Citation1998. <i>Rock glaciers, Disko Island, Greenland.</i> [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. <a href="https://doi.org/10.7265/ghx6-ja82">https://doi.org/10.7265/ghx6-ja82</a>. [Date Accessed].NSIDCRetiredfalseNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalsejroebuckmmt_service_12556S1962622169-NSIDCV0NSIDCV05service2023-04-25T21:20:48.786Zftp://sidads.colorado.edu/NSIDCV0_FTPNOT PROVIDED1FTP File SystemDownload data via FTP using an FTP client, command line utility or a script, e.g., Pythonhttps://nsidc.org/data/user-resources/help-center/how-access-data-using-ftp-client-command-line-wget-or-pythonVIEW RELATED INFORMATIONFTP Access GuidePublicationURLUSER SERVICESNSIDC User ServicesEmailnsidc@nsidc.orgDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service. Last updated date is unknown.SERVICE PROVIDERNational Snow and Ice Data CenterNSIDCNational Snow and Ice Data Center home pagehttps://nsidc.org/National Snow and Ice Data Center home page.https://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4ftp://sidads.colorado.edu/pub/DATASETS/fgdc/ggd283_rockglac_greenland/