Eintrag weiter verarbeiten
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica
Gespeichert in:
| Zeitschriftentitel: | Journal of Geophysical Research: Earth Surface |
|---|---|
| Personen und Körperschaften: | , , , , , , , , |
| In: | Journal of Geophysical Research: Earth Surface, 117, 2012, F3 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. |
|---|---|
| author |
Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. |
| spellingShingle |
Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. Journal of Geophysical Research: Earth Surface Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
vaughan, david g. |
| spelling |
Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2012jf002360 <jats:p>A dense grid of ice‐penetrating radar sections acquired over Pine Island Glacier, West Antarctica has revealed a network of sinuous subglacial channels, typically 500 m to 3 km wide, and up to 200 m high, in the ice‐shelf base. These subglacial channels develop while the ice is floating and result from melting at the base of the ice shelf. Above the apex of most channels, the radar shows isolated reflections from within the ice shelf. Comparison of the radar data with acoustic data obtained using an autonomous submersible, confirms that these echoes arise from open basal crevasses 50–100 m wide aligned with the subglacial channels and penetrating up to 1/3 of the ice thickness. Analogous sets of surface crevasses appear on the ridges between the basal channels. We suggest that both sets of crevasses were formed during the melting of the subglacial channels as a response to vertical flexing of the ice shelf toward the hydrostatic condition. Finite element modeling of stresses produced after the formation of idealized basal channels indicates that the stresses generated have the correct pattern and, if the channels were formed sufficiently rapidly, would have sufficient magnitude to explain the formation of the observed basal and surface crevasse sets. We conclude that ice‐shelf basal melting plays a role in determining patterns of surface and basal crevassing. Increased delivery of warm ocean water into the sub‐ice shelf cavity may therefore cause not only thinning but also structural weakening of the ice shelf, perhaps, as a prelude to eventual collapse.</jats:p> Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica Journal of Geophysical Research: Earth Surface |
| doi_str_mv |
10.1029/2012jf002360 |
| facet_avail |
Online Free |
| finc_class_facet |
Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie |
| format |
ElectronicArticle |
| fullrecord |
blob:ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAyOS8yMDEyamYwMDIzNjA |
| id |
ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAyOS8yMDEyamYwMDIzNjA |
| institution |
DE-D275 DE-Bn3 DE-Brt1 DE-D161 DE-Zwi2 DE-Gla1 DE-Zi4 DE-15 DE-Pl11 DE-Rs1 DE-105 DE-14 DE-Ch1 DE-L229 |
| imprint |
American Geophysical Union (AGU), 2012 |
| imprint_str_mv |
American Geophysical Union (AGU), 2012 |
| issn |
0148-0227 |
| issn_str_mv |
0148-0227 |
| language |
English |
| mega_collection |
American Geophysical Union (AGU) (CrossRef) |
| match_str |
vaughan2012subglacialmeltchannelsandfractureinthefloatingpartofpineislandglacierantarctica |
| publishDateSort |
2012 |
| publisher |
American Geophysical Union (AGU) |
| recordtype |
ai |
| record_format |
ai |
| series |
Journal of Geophysical Research: Earth Surface |
| source_id |
49 |
| title |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_unstemmed |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_full |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_fullStr |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_full_unstemmed |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_short |
Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_sort |
subglacial melt channels and fracture in the floating part of pine island glacier, antarctica |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2012jf002360 |
| publishDate |
2012 |
| physical |
|
| description |
<jats:p>A dense grid of ice‐penetrating radar sections acquired over Pine Island Glacier, West Antarctica has revealed a network of sinuous subglacial channels, typically 500 m to 3 km wide, and up to 200 m high, in the ice‐shelf base. These subglacial channels develop while the ice is floating and result from melting at the base of the ice shelf. Above the apex of most channels, the radar shows isolated reflections from within the ice shelf. Comparison of the radar data with acoustic data obtained using an autonomous submersible, confirms that these echoes arise from open basal crevasses 50–100 m wide aligned with the subglacial channels and penetrating up to 1/3 of the ice thickness. Analogous sets of surface crevasses appear on the ridges between the basal channels. We suggest that both sets of crevasses were formed during the melting of the subglacial channels as a response to vertical flexing of the ice shelf toward the hydrostatic condition. Finite element modeling of stresses produced after the formation of idealized basal channels indicates that the stresses generated have the correct pattern and, if the channels were formed sufficiently rapidly, would have sufficient magnitude to explain the formation of the observed basal and surface crevasse sets. We conclude that ice‐shelf basal melting plays a role in determining patterns of surface and basal crevassing. Increased delivery of warm ocean water into the sub‐ice shelf cavity may therefore cause not only thinning but also structural weakening of the ice shelf, perhaps, as a prelude to eventual collapse.</jats:p> |
| container_issue |
F3 |
| container_start_page |
0 |
| container_title |
Journal of Geophysical Research: Earth Surface |
| container_volume |
117 |
| 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_ |
1792347983432384514 |
| geogr_code |
not assigned |
| last_indexed |
2024-03-01T18:03:57.744Z |
| 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=Subglacial+melt+channels+and+fracture+in+the+floating+part+of+Pine+Island+Glacier%2C+Antarctica&rft.date=2012-09-01&genre=article&issn=0148-0227&volume=117&issue=F3&jtitle=Journal+of+Geophysical+Research%3A+Earth+Surface&atitle=Subglacial+melt+channels+and+fracture+in+the+floating+part+of+Pine+Island+Glacier%2C+Antarctica&aulast=Wingham&aufirst=Duncan+J.&rft_id=info%3Adoi%2F10.1029%2F2012jf002360&rft.language%5B0%5D=eng |
| SOLR | |
| _version_ | 1792347983432384514 |
| author | Vaughan, David G., Corr, Hugh F. J., Bindschadler, Robert A., Dutrieux, Pierre, Gudmundsson, G. Hilmar, Jenkins, Adrian, Newman, Thomas, Vornberger, Patricia, Wingham, Duncan J. |
| author_facet | Vaughan, David G., Corr, Hugh F. J., Bindschadler, Robert A., Dutrieux, Pierre, Gudmundsson, G. Hilmar, Jenkins, Adrian, Newman, Thomas, Vornberger, Patricia, Wingham, Duncan J., Vaughan, David G., Corr, Hugh F. J., Bindschadler, Robert A., Dutrieux, Pierre, Gudmundsson, G. Hilmar, Jenkins, Adrian, Newman, Thomas, Vornberger, Patricia, Wingham, Duncan J. |
| author_sort | vaughan, david g. |
| container_issue | F3 |
| container_start_page | 0 |
| container_title | Journal of Geophysical Research: Earth Surface |
| container_volume | 117 |
| description | <jats:p>A dense grid of ice‐penetrating radar sections acquired over Pine Island Glacier, West Antarctica has revealed a network of sinuous subglacial channels, typically 500 m to 3 km wide, and up to 200 m high, in the ice‐shelf base. These subglacial channels develop while the ice is floating and result from melting at the base of the ice shelf. Above the apex of most channels, the radar shows isolated reflections from within the ice shelf. Comparison of the radar data with acoustic data obtained using an autonomous submersible, confirms that these echoes arise from open basal crevasses 50–100 m wide aligned with the subglacial channels and penetrating up to 1/3 of the ice thickness. Analogous sets of surface crevasses appear on the ridges between the basal channels. We suggest that both sets of crevasses were formed during the melting of the subglacial channels as a response to vertical flexing of the ice shelf toward the hydrostatic condition. Finite element modeling of stresses produced after the formation of idealized basal channels indicates that the stresses generated have the correct pattern and, if the channels were formed sufficiently rapidly, would have sufficient magnitude to explain the formation of the observed basal and surface crevasse sets. We conclude that ice‐shelf basal melting plays a role in determining patterns of surface and basal crevassing. Increased delivery of warm ocean water into the sub‐ice shelf cavity may therefore cause not only thinning but also structural weakening of the ice shelf, perhaps, as a prelude to eventual collapse.</jats:p> |
| doi_str_mv | 10.1029/2012jf002360 |
| facet_avail | Online, Free |
| finc_class_facet | Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie, Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie |
| 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-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAyOS8yMDEyamYwMDIzNjA |
| imprint | American Geophysical Union (AGU), 2012 |
| imprint_str_mv | American Geophysical Union (AGU), 2012 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Zwi2, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229 |
| issn | 0148-0227 |
| issn_str_mv | 0148-0227 |
| language | English |
| last_indexed | 2024-03-01T18:03:57.744Z |
| match_str | vaughan2012subglacialmeltchannelsandfractureinthefloatingpartofpineislandglacierantarctica |
| mega_collection | American Geophysical Union (AGU) (CrossRef) |
| physical | |
| publishDate | 2012 |
| publishDateSort | 2012 |
| publisher | American Geophysical Union (AGU) |
| record_format | ai |
| recordtype | ai |
| series | Journal of Geophysical Research: Earth Surface |
| source_id | 49 |
| spelling | Vaughan, David G. Corr, Hugh F. J. Bindschadler, Robert A. Dutrieux, Pierre Gudmundsson, G. Hilmar Jenkins, Adrian Newman, Thomas Vornberger, Patricia Wingham, Duncan J. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2012jf002360 <jats:p>A dense grid of ice‐penetrating radar sections acquired over Pine Island Glacier, West Antarctica has revealed a network of sinuous subglacial channels, typically 500 m to 3 km wide, and up to 200 m high, in the ice‐shelf base. These subglacial channels develop while the ice is floating and result from melting at the base of the ice shelf. Above the apex of most channels, the radar shows isolated reflections from within the ice shelf. Comparison of the radar data with acoustic data obtained using an autonomous submersible, confirms that these echoes arise from open basal crevasses 50–100 m wide aligned with the subglacial channels and penetrating up to 1/3 of the ice thickness. Analogous sets of surface crevasses appear on the ridges between the basal channels. We suggest that both sets of crevasses were formed during the melting of the subglacial channels as a response to vertical flexing of the ice shelf toward the hydrostatic condition. Finite element modeling of stresses produced after the formation of idealized basal channels indicates that the stresses generated have the correct pattern and, if the channels were formed sufficiently rapidly, would have sufficient magnitude to explain the formation of the observed basal and surface crevasse sets. We conclude that ice‐shelf basal melting plays a role in determining patterns of surface and basal crevassing. Increased delivery of warm ocean water into the sub‐ice shelf cavity may therefore cause not only thinning but also structural weakening of the ice shelf, perhaps, as a prelude to eventual collapse.</jats:p> Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica Journal of Geophysical Research: Earth Surface |
| spellingShingle | Vaughan, David G., Corr, Hugh F. J., Bindschadler, Robert A., Dutrieux, Pierre, Gudmundsson, G. Hilmar, Jenkins, Adrian, Newman, Thomas, Vornberger, Patricia, Wingham, Duncan J., Journal of Geophysical Research: Earth Surface, Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_full | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_fullStr | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_full_unstemmed | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_short | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| title_sort | subglacial melt channels and fracture in the floating part of pine island glacier, antarctica |
| title_unstemmed | Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2012jf002360 |