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Statements

Subject Item
dbr:Ice_divide
rdf:type
dbo:AnatomicalStructure
rdfs:label
IJsscheiding Eisscheide Isdelare Spartighiaccio Ice divide
rdfs:comment
In analogia con lo spartiacque, uno spartighiaccio o linea spartighiaccio (in lingua inglese ice divide) viene definito come un confine o linea di demarcazione su di un ghiacciaio continentale, cappa di ghiaccio o ghiacciaio vallivo che separa direzioni di flusso opposti di ghiaccio. Tali spartighiaccio sono importanti per le ricerche in geocronologia che utilizza carote di ghiaccio, in genere prelevate sulla cima di una cupola del ghiacciaio onde evitare interferenze causate dal movimento orizzontale del ghiaccio. Begreppet isdelare är besläktat med vattendelare. Det är den högsta, centrala delen av en inlandsis eller kalottglaciär från vilken isen rör sig ut åt alla håll. Isen i en glaciär rör sig mycket långsammare än rinnande vatten. Men även isen rör sig. Vissa glaciärer täcker den översta kammen på en bergskedja. Då rör sig isen åt olika håll på de olika sidorna. Eine Eisscheide oder auch Gletscherscheide ist ähnlich einer Wasserscheide die Stelle eines Eisschilds, einer Eiskappe oder eines Gletschers, an der das Eis in unterschiedliche Richtungen abfließt. Solche Eisscheiden haben eine besondere Bedeutung im Hinblick auf die an Eisschilden mittels Bohrungen durchgeführte Forschung, denn solche Bohrungen werden meist auf dem Scheitel solcher Eisschilde durchgeführt um möglichst nur vertikale Bewegungen des Eises ohne Störungen durch seitliche Fließbewegungen anzutreffen. An ice divide is the boundary on an ice sheet, ice cap or glacier separating opposing flow directions of ice, analogous to a water divide. Ice divides are important for geochronological investigations that use ice cores, since such coring is typically made at highest point of an ice sheet dome to avoid disturbances arising from horizontal ice movement. Ice divides are used for looking at how the atmosphere varied over time. Coring at dome peaks increases precision of reconstructions as it is the place where horizontal motion is at its least. The Raymond Effect operates at ice divides, creating anticlines in the radar-detected isochrones, allowing greater capture of older ice when coring. Een ijsscheiding is de grenslijn tussen twee stroomgebieden van gletsjers of ijskappen. Dit begrip is vergelijkbaar met de waterscheiding als het vloeibaar water betreft. Vanaf een ijsscheiding stroomt gletsjerijs in verschillende richtingen.
dct:subject
dbc:Glaciology dbc:Water_ice
dbo:wikiPageID
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dbo:wikiPageRevisionID
1121025907
dbo:wikiPageWikiLink
dbr:Drainage_divide dbr:Greenhouse_effect dbr:West_Antarctic_Ice_Sheet dbr:Ice_sheet dbc:Glaciology dbr:WAIS_Divide dbr:Raymond_Effect dbr:Glacier dbr:Ice dbr:Climate dbr:Ground-penetrating_radar dbr:Anticline dbr:Greenhouse_gas dbr:Geochronology dbr:Ice_core dbr:National_Ice_Core_Laboratory dbr:Antarctic_ice_sheet dbc:Water_ice dbr:Ice_cap
owl:sameAs
dbpedia-sv:Isdelare dbpedia-nl:IJsscheiding dbpedia-de:Eisscheide freebase:m.02qlznm dbpedia-fi:Jäänjakaja n16:4qPfF dbpedia-it:Spartighiaccio dbpedia-nn:Isskilje wikidata:Q661400
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dbt:Glaciology-stub dbt:Topography-stub dbt:Reflist dbt:Glaciers
dbo:abstract
In analogia con lo spartiacque, uno spartighiaccio o linea spartighiaccio (in lingua inglese ice divide) viene definito come un confine o linea di demarcazione su di un ghiacciaio continentale, cappa di ghiaccio o ghiacciaio vallivo che separa direzioni di flusso opposti di ghiaccio. Tali spartighiaccio sono importanti per le ricerche in geocronologia che utilizza carote di ghiaccio, in genere prelevate sulla cima di una cupola del ghiacciaio onde evitare interferenze causate dal movimento orizzontale del ghiaccio. Begreppet isdelare är besläktat med vattendelare. Det är den högsta, centrala delen av en inlandsis eller kalottglaciär från vilken isen rör sig ut åt alla håll. Isen i en glaciär rör sig mycket långsammare än rinnande vatten. Men även isen rör sig. Vissa glaciärer täcker den översta kammen på en bergskedja. Då rör sig isen åt olika håll på de olika sidorna. Een ijsscheiding is de grenslijn tussen twee stroomgebieden van gletsjers of ijskappen. Dit begrip is vergelijkbaar met de waterscheiding als het vloeibaar water betreft. Vanaf een ijsscheiding stroomt gletsjerijs in verschillende richtingen. Eine Eisscheide oder auch Gletscherscheide ist ähnlich einer Wasserscheide die Stelle eines Eisschilds, einer Eiskappe oder eines Gletschers, an der das Eis in unterschiedliche Richtungen abfließt. Solche Eisscheiden haben eine besondere Bedeutung im Hinblick auf die an Eisschilden mittels Bohrungen durchgeführte Forschung, denn solche Bohrungen werden meist auf dem Scheitel solcher Eisschilde durchgeführt um möglichst nur vertikale Bewegungen des Eises ohne Störungen durch seitliche Fließbewegungen anzutreffen. Ein Beispiel für eine Eisscheide in den Alpen findet sich am Kesselwandjoch in den Ötztaler Alpen, von dort fließt das Eis des Gepatschferners nach Westen, das des Kesselwandferners nach Osten. Gletscherstromscheiden werden oft auch als Eisscheiden bezeichnet. Dabei handelt es sich aber im Unterschied zu obiger Bedeutung um eine Verzweigung eines auf ein Hindernis treffenden Gletschers. An ice divide is the boundary on an ice sheet, ice cap or glacier separating opposing flow directions of ice, analogous to a water divide. Ice divides are important for geochronological investigations that use ice cores, since such coring is typically made at highest point of an ice sheet dome to avoid disturbances arising from horizontal ice movement. Ice divides are used for looking at how the atmosphere varied over time. Coring at dome peaks increases precision of reconstructions as it is the place where horizontal motion is at its least. The Raymond Effect operates at ice divides, creating anticlines in the radar-detected isochrones, allowing greater capture of older ice when coring. Analysis of ice cores relies on the downward motion of ice, trapping changes of atmospheric gases through time into its layers. Scientist locate ice divides and take ice cores from them, which are typically long cylindrical poles of ice, and analyse them to find chemical elements that the snow and ice transported during that period, e.g. sulfate, nitrate, and other ions. Ice cores are important in determining how our atmosphere has changed, and how we can remedy changes such as the greenhouse effect; scientists found more greenhouse gases were in our atmosphere at present than in the past. Scientists from around the United States came together to find the best ice divide in order to go the further into the past. They founded the WAIS project, which is funded by the United States National Science Foundation, and is run by scientists from many organizations e.g. National Ice Core Laboratory, Ice Drilling Design and Operations (IDDO), and over fifty universities. The WAIS project is located in West Antarctica, and the goal is to look into the evolution of the Antarctic ice sheet and climate over the past 100,000 years. The West Antarctic Ice Sheet (WAIS) is better than other ice divides because of the amount of snow it gets, which means that the layers of ice are thicker. This larger layer thickness means there to be a smaller off-set between the ages of the ice and that of the air and gases trapped inside, allowing scientists to give more precise statements about how the atmosphere varied in the past. The success of the WAIS project has educated scientists around the world as to how the atmosphere of Earth has changed dramatically over 100,000 years.
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wikipedia-en:Ice_divide?oldid=1121025907&ns=0
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3316
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