Eintrag weiter verarbeiten
Of isbræ and ice streams
Gespeichert in:
| Zeitschriftentitel: | Annals of Glaciology |
|---|---|
| Personen und Körperschaften: | , |
| In: | Annals of Glaciology, 36, 2003, S. 66-72 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Truffer, Martin Echelmeyer, Keith A. Truffer, Martin Echelmeyer, Keith A. |
|---|---|
| author |
Truffer, Martin Echelmeyer, Keith A. |
| spellingShingle |
Truffer, Martin Echelmeyer, Keith A. Annals of Glaciology Of isbræ and ice streams Earth-Surface Processes |
| author_sort |
truffer, martin |
| spelling |
Truffer, Martin Echelmeyer, Keith A. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756403781816347 <jats:title>Abstract</jats:title><jats:p>Fast-flowing ice streams and outlet glaciers provide the major avenues for ice flow from past and present ice sheets. These ice streams move faster than the surrounding ice sheet by a factor of 100 or more. Several mechanisms for fast ice-stream flow have been identified, leading to a spectrum of different ice-stream types. In this paper we discuss the two end members of this spectrum, which we term the “ice-stream” type (represented by the Siple Coast ice streams in West Antarctica) and the “isbræ” type (represented by Jakobshavn Isbræ in Greenland). The typical ice stream is wide, relatively shallow (∼1000 m), has a low surface slope and driving stress (∼10 kPa), and ice-stream location is not strongly controlled by bed topography. Fast flow is possible because the ice stream has a slippery bed, possibly underlain by weak, actively deforming sediments. The marginal shear zones are narrow and support most of the driving stress, and the ice deforms almost exclusively by transverse shear. The margins seem to be inherently unstable; they migrate, and there are plausible mechanisms for such ice streams to shut down. The isbræ type of ice stream is characterized by very high driving stresses, often exceeding 200 kPa. They flow through deep bedrock channels that are significantly deeper than the surrounding ice, and have steep surface slopes. Ice deformation includes vertical as well as lateral shear, and basal motion need not contribute significantly to the overall motion. The marginal shear zone stend to be wide relative to the isbræ width, and the location of isbræ and its margins is strongly controlled by bedrock topography. They are stable features, and can only shut down if the high ice flux cannot be supplied from the adjacent ice sheet. Isbræs occur in Greenland and East Antarctica, and possibly parts of Pine Island and Thwaites Glaciers, West Antarctica. In this paper, we compare and contrast the two types of ice streams, addressing questions such as ice deformation, basal motion, subglacial hydrology, seasonality of ice flow, and stability of the ice streams.</jats:p> Of isbræ and ice streams Annals of Glaciology |
| doi_str_mv |
10.3189/172756403781816347 |
| facet_avail |
Online Free |
| finc_class_facet |
Geologie und Paläontologie Geographie |
| format |
ElectronicArticle |
| fullrecord |
blob:ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY0MDM3ODE4MTYzNDc |
| id |
ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY0MDM3ODE4MTYzNDc |
| institution |
DE-Brt1 DE-Zwi2 DE-D161 DE-Gla1 DE-Zi4 DE-15 DE-Pl11 DE-Rs1 DE-105 DE-14 DE-Ch1 DE-L229 DE-D275 DE-Bn3 |
| imprint |
International Glaciological Society, 2003 |
| imprint_str_mv |
International Glaciological Society, 2003 |
| issn |
0260-3055 1727-5644 |
| issn_str_mv |
0260-3055 1727-5644 |
| language |
English |
| mega_collection |
International Glaciological Society (CrossRef) |
| match_str |
truffer2003ofisbraeandicestreams |
| publishDateSort |
2003 |
| publisher |
International Glaciological Society |
| recordtype |
ai |
| record_format |
ai |
| series |
Annals of Glaciology |
| source_id |
49 |
| title |
Of isbræ and ice streams |
| title_unstemmed |
Of isbræ and ice streams |
| title_full |
Of isbræ and ice streams |
| title_fullStr |
Of isbræ and ice streams |
| title_full_unstemmed |
Of isbræ and ice streams |
| title_short |
Of isbræ and ice streams |
| title_sort |
of isbræ and ice streams |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756403781816347 |
| publishDate |
2003 |
| physical |
66-72 |
| description |
<jats:title>Abstract</jats:title><jats:p>Fast-flowing ice streams and outlet glaciers provide the major avenues for ice flow from past and present ice sheets. These ice streams move faster than the surrounding ice sheet by a factor of 100 or more. Several mechanisms for fast ice-stream flow have been identified, leading to a spectrum of different ice-stream types. In this paper we discuss the two end members of this spectrum, which we term the “ice-stream” type (represented by the Siple Coast ice streams in West Antarctica) and the “isbræ” type (represented by Jakobshavn Isbræ in Greenland). The typical ice stream is wide, relatively shallow (∼1000 m), has a low surface slope and driving stress (∼10 kPa), and ice-stream location is not strongly controlled by bed topography. Fast flow is possible because the ice stream has a slippery bed, possibly underlain by weak, actively deforming sediments. The marginal shear zones are narrow and support most of the driving stress, and the ice deforms almost exclusively by transverse shear. The margins seem to be inherently unstable; they migrate, and there are plausible mechanisms for such ice streams to shut down. The isbræ type of ice stream is characterized by very high driving stresses, often exceeding 200 kPa. They flow through deep bedrock channels that are significantly deeper than the surrounding ice, and have steep surface slopes. Ice deformation includes vertical as well as lateral shear, and basal motion need not contribute significantly to the overall motion. The marginal shear zone stend to be wide relative to the isbræ width, and the location of isbræ and its margins is strongly controlled by bedrock topography. They are stable features, and can only shut down if the high ice flux cannot be supplied from the adjacent ice sheet. Isbræs occur in Greenland and East Antarctica, and possibly parts of Pine Island and Thwaites Glaciers, West Antarctica. In this paper, we compare and contrast the two types of ice streams, addressing questions such as ice deformation, basal motion, subglacial hydrology, seasonality of ice flow, and stability of the ice streams.</jats:p> |
| container_start_page |
66 |
| container_title |
Annals of Glaciology |
| container_volume |
36 |
| format_de105 |
Article, E-Article |
| format_de14 |
Article, E-Article |
| format_de15 |
Article, E-Article |
| format_de520 |
Article, E-Article |
| format_de540 |
Article, E-Article |
| format_dech1 |
Article, E-Article |
| format_ded117 |
Article, E-Article |
| format_degla1 |
E-Article |
| format_del152 |
Buch |
| format_del189 |
Article, E-Article |
| format_dezi4 |
Article |
| format_dezwi2 |
Article, E-Article |
| format_finc |
Article, E-Article |
| format_nrw |
Article, E-Article |
| _version_ |
1792344731019116545 |
| geogr_code |
not assigned |
| last_indexed |
2024-03-01T17:11:25.632Z |
| geogr_code_person |
not assigned |
| openURL |
url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fvufind.svn.sourceforge.net%3Agenerator&rft.title=Of+isbr%C3%A6+and+ice+streams&rft.date=2003-01-01&genre=article&issn=1727-5644&volume=36&spage=66&epage=72&pages=66-72&jtitle=Annals+of+Glaciology&atitle=Of+isbr%C3%A6+and+ice+streams&aulast=Echelmeyer&aufirst=Keith+A.&rft_id=info%3Adoi%2F10.3189%2F172756403781816347&rft.language%5B0%5D=eng |
| SOLR | |
| _version_ | 1792344731019116545 |
| author | Truffer, Martin, Echelmeyer, Keith A. |
| author_facet | Truffer, Martin, Echelmeyer, Keith A., Truffer, Martin, Echelmeyer, Keith A. |
| author_sort | truffer, martin |
| container_start_page | 66 |
| container_title | Annals of Glaciology |
| container_volume | 36 |
| description | <jats:title>Abstract</jats:title><jats:p>Fast-flowing ice streams and outlet glaciers provide the major avenues for ice flow from past and present ice sheets. These ice streams move faster than the surrounding ice sheet by a factor of 100 or more. Several mechanisms for fast ice-stream flow have been identified, leading to a spectrum of different ice-stream types. In this paper we discuss the two end members of this spectrum, which we term the “ice-stream” type (represented by the Siple Coast ice streams in West Antarctica) and the “isbræ” type (represented by Jakobshavn Isbræ in Greenland). The typical ice stream is wide, relatively shallow (∼1000 m), has a low surface slope and driving stress (∼10 kPa), and ice-stream location is not strongly controlled by bed topography. Fast flow is possible because the ice stream has a slippery bed, possibly underlain by weak, actively deforming sediments. The marginal shear zones are narrow and support most of the driving stress, and the ice deforms almost exclusively by transverse shear. The margins seem to be inherently unstable; they migrate, and there are plausible mechanisms for such ice streams to shut down. The isbræ type of ice stream is characterized by very high driving stresses, often exceeding 200 kPa. They flow through deep bedrock channels that are significantly deeper than the surrounding ice, and have steep surface slopes. Ice deformation includes vertical as well as lateral shear, and basal motion need not contribute significantly to the overall motion. The marginal shear zone stend to be wide relative to the isbræ width, and the location of isbræ and its margins is strongly controlled by bedrock topography. They are stable features, and can only shut down if the high ice flux cannot be supplied from the adjacent ice sheet. Isbræs occur in Greenland and East Antarctica, and possibly parts of Pine Island and Thwaites Glaciers, West Antarctica. In this paper, we compare and contrast the two types of ice streams, addressing questions such as ice deformation, basal motion, subglacial hydrology, seasonality of ice flow, and stability of the ice streams.</jats:p> |
| doi_str_mv | 10.3189/172756403781816347 |
| facet_avail | Online, Free |
| finc_class_facet | Geologie und Paläontologie, Geographie |
| format | ElectronicArticle |
| format_de105 | Article, E-Article |
| format_de14 | Article, E-Article |
| format_de15 | Article, E-Article |
| format_de520 | Article, E-Article |
| format_de540 | Article, E-Article |
| format_dech1 | Article, E-Article |
| format_ded117 | Article, E-Article |
| format_degla1 | E-Article |
| format_del152 | Buch |
| format_del189 | Article, E-Article |
| format_dezi4 | Article |
| format_dezwi2 | Article, E-Article |
| format_finc | Article, E-Article |
| format_nrw | Article, E-Article |
| geogr_code | not assigned |
| geogr_code_person | not assigned |
| id | ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY0MDM3ODE4MTYzNDc |
| imprint | International Glaciological Society, 2003 |
| imprint_str_mv | International Glaciological Society, 2003 |
| institution | DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3 |
| issn | 0260-3055, 1727-5644 |
| issn_str_mv | 0260-3055, 1727-5644 |
| language | English |
| last_indexed | 2024-03-01T17:11:25.632Z |
| match_str | truffer2003ofisbraeandicestreams |
| mega_collection | International Glaciological Society (CrossRef) |
| physical | 66-72 |
| publishDate | 2003 |
| publishDateSort | 2003 |
| publisher | International Glaciological Society |
| record_format | ai |
| recordtype | ai |
| series | Annals of Glaciology |
| source_id | 49 |
| spelling | Truffer, Martin Echelmeyer, Keith A. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756403781816347 <jats:title>Abstract</jats:title><jats:p>Fast-flowing ice streams and outlet glaciers provide the major avenues for ice flow from past and present ice sheets. These ice streams move faster than the surrounding ice sheet by a factor of 100 or more. Several mechanisms for fast ice-stream flow have been identified, leading to a spectrum of different ice-stream types. In this paper we discuss the two end members of this spectrum, which we term the “ice-stream” type (represented by the Siple Coast ice streams in West Antarctica) and the “isbræ” type (represented by Jakobshavn Isbræ in Greenland). The typical ice stream is wide, relatively shallow (∼1000 m), has a low surface slope and driving stress (∼10 kPa), and ice-stream location is not strongly controlled by bed topography. Fast flow is possible because the ice stream has a slippery bed, possibly underlain by weak, actively deforming sediments. The marginal shear zones are narrow and support most of the driving stress, and the ice deforms almost exclusively by transverse shear. The margins seem to be inherently unstable; they migrate, and there are plausible mechanisms for such ice streams to shut down. The isbræ type of ice stream is characterized by very high driving stresses, often exceeding 200 kPa. They flow through deep bedrock channels that are significantly deeper than the surrounding ice, and have steep surface slopes. Ice deformation includes vertical as well as lateral shear, and basal motion need not contribute significantly to the overall motion. The marginal shear zone stend to be wide relative to the isbræ width, and the location of isbræ and its margins is strongly controlled by bedrock topography. They are stable features, and can only shut down if the high ice flux cannot be supplied from the adjacent ice sheet. Isbræs occur in Greenland and East Antarctica, and possibly parts of Pine Island and Thwaites Glaciers, West Antarctica. In this paper, we compare and contrast the two types of ice streams, addressing questions such as ice deformation, basal motion, subglacial hydrology, seasonality of ice flow, and stability of the ice streams.</jats:p> Of isbræ and ice streams Annals of Glaciology |
| spellingShingle | Truffer, Martin, Echelmeyer, Keith A., Annals of Glaciology, Of isbræ and ice streams, Earth-Surface Processes |
| title | Of isbræ and ice streams |
| title_full | Of isbræ and ice streams |
| title_fullStr | Of isbræ and ice streams |
| title_full_unstemmed | Of isbræ and ice streams |
| title_short | Of isbræ and ice streams |
| title_sort | of isbræ and ice streams |
| title_unstemmed | Of isbræ and ice streams |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756403781816347 |