Eintrag weiter verarbeiten
Can climate warming induce glacier advance in Taylor Valley, Antarctica?
Gespeichert in:
| Zeitschriftentitel: | Journal of Glaciology |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Journal of Glaciology, 50, 2004, 171, S. 556-564 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor |
|---|---|
| author |
Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor |
| spellingShingle |
Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor Journal of Glaciology Can climate warming induce glacier advance in Taylor Valley, Antarctica? Earth-Surface Processes |
| author_sort |
fountain, andrew g. |
| spelling |
Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756504781829701 <jats:title>Abstract</jats:title><jats:p>Changes in the extent of the polar alpine glaciers within Taylor Valley, Antarctica, are important for understanding past climates and past changes in ice-dammed lakes. Comparison of ground-based photographs, taken over a 20 year period, shows glacier advances of 2-100 m. Over the past ~10<jats:sup>3</jats:sup>years the climate has warmed. We hypothesize that an increase in average air temperature alone can explain the observed glacier advance through ice softening. We test this hypothesis by using a flowband model that includes a temperature-dependent softness term. Results show that, for a 2˚C warming, a small glacier (50 km<jats:sup>2</jats:sup>) advances ~25m and the ablation zone thins, consistent with observations. A doubling of snow accumulation would also explain the glacial advance, but predicts ablation-zone thickening, rather than thinning as observed. Problems encountered in modeling glacier flow lead to two intriguing but unresolved issues. First, the current form of the shape factor, which distributes the stress in simple flow models, may need to be revised for polar glaciers. Second, the measured mass-balance gradient in Taylor Valley may be anomalously low, compared to past times, and a larger gradient is required to develop the glacier profiles observed today.</jats:p> Can climate warming induce glacier advance in Taylor Valley, Antarctica? Journal of Glaciology |
| doi_str_mv |
10.3189/172756504781829701 |
| facet_avail |
Online Free |
| finc_class_facet |
Geographie Geologie und Paläontologie |
| format |
ElectronicArticle |
| fullrecord |
blob:ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY1MDQ3ODE4Mjk3MDE |
| id |
ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY1MDQ3ODE4Mjk3MDE |
| institution |
DE-D161 DE-Zwi2 DE-Gla1 DE-Zi4 DE-15 DE-Pl11 DE-Rs1 DE-105 DE-14 DE-Ch1 DE-L229 DE-D275 DE-Bn3 DE-Brt1 |
| imprint |
International Glaciological Society, 2004 |
| imprint_str_mv |
International Glaciological Society, 2004 |
| issn |
0022-1430 1727-5652 |
| issn_str_mv |
0022-1430 1727-5652 |
| language |
English |
| mega_collection |
International Glaciological Society (CrossRef) |
| match_str |
fountain2004canclimatewarminginduceglacieradvanceintaylorvalleyantarctica |
| publishDateSort |
2004 |
| publisher |
International Glaciological Society |
| recordtype |
ai |
| record_format |
ai |
| series |
Journal of Glaciology |
| source_id |
49 |
| title |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_unstemmed |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_full |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_fullStr |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_full_unstemmed |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_short |
Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_sort |
can climate warming induce glacier advance in taylor valley, antarctica? |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756504781829701 |
| publishDate |
2004 |
| physical |
556-564 |
| description |
<jats:title>Abstract</jats:title><jats:p>Changes in the extent of the polar alpine glaciers within Taylor Valley, Antarctica, are important for understanding past climates and past changes in ice-dammed lakes. Comparison of ground-based photographs, taken over a 20 year period, shows glacier advances of 2-100 m. Over the past ~10<jats:sup>3</jats:sup>years the climate has warmed. We hypothesize that an increase in average air temperature alone can explain the observed glacier advance through ice softening. We test this hypothesis by using a flowband model that includes a temperature-dependent softness term. Results show that, for a 2˚C warming, a small glacier (50 km<jats:sup>2</jats:sup>) advances ~25m and the ablation zone thins, consistent with observations. A doubling of snow accumulation would also explain the glacial advance, but predicts ablation-zone thickening, rather than thinning as observed. Problems encountered in modeling glacier flow lead to two intriguing but unresolved issues. First, the current form of the shape factor, which distributes the stress in simple flow models, may need to be revised for polar glaciers. Second, the measured mass-balance gradient in Taylor Valley may be anomalously low, compared to past times, and a larger gradient is required to develop the glacier profiles observed today.</jats:p> |
| container_issue |
171 |
| container_start_page |
556 |
| container_title |
Journal of Glaciology |
| container_volume |
50 |
| 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_ |
1792337329853038600 |
| geogr_code |
not assigned |
| last_indexed |
2024-03-01T15:14:34.415Z |
| 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=Can+climate+warming+induce+glacier+advance+in+Taylor+Valley%2C+Antarctica%3F&rft.date=2004-01-01&genre=article&issn=1727-5652&volume=50&issue=171&spage=556&epage=564&pages=556-564&jtitle=Journal+of+Glaciology&atitle=Can+climate+warming+induce+glacier+advance+in+Taylor+Valley%2C+Antarctica%3F&aulast=Chinn&aufirst=Trevor&rft_id=info%3Adoi%2F10.3189%2F172756504781829701&rft.language%5B0%5D=eng |
| SOLR | |
| _version_ | 1792337329853038600 |
| author | Fountain, Andrew G., Neumann, Thomas A., Glenn, Paul L., Chinn, Trevor |
| author_facet | Fountain, Andrew G., Neumann, Thomas A., Glenn, Paul L., Chinn, Trevor, Fountain, Andrew G., Neumann, Thomas A., Glenn, Paul L., Chinn, Trevor |
| author_sort | fountain, andrew g. |
| container_issue | 171 |
| container_start_page | 556 |
| container_title | Journal of Glaciology |
| container_volume | 50 |
| description | <jats:title>Abstract</jats:title><jats:p>Changes in the extent of the polar alpine glaciers within Taylor Valley, Antarctica, are important for understanding past climates and past changes in ice-dammed lakes. Comparison of ground-based photographs, taken over a 20 year period, shows glacier advances of 2-100 m. Over the past ~10<jats:sup>3</jats:sup>years the climate has warmed. We hypothesize that an increase in average air temperature alone can explain the observed glacier advance through ice softening. We test this hypothesis by using a flowband model that includes a temperature-dependent softness term. Results show that, for a 2˚C warming, a small glacier (50 km<jats:sup>2</jats:sup>) advances ~25m and the ablation zone thins, consistent with observations. A doubling of snow accumulation would also explain the glacial advance, but predicts ablation-zone thickening, rather than thinning as observed. Problems encountered in modeling glacier flow lead to two intriguing but unresolved issues. First, the current form of the shape factor, which distributes the stress in simple flow models, may need to be revised for polar glaciers. Second, the measured mass-balance gradient in Taylor Valley may be anomalously low, compared to past times, and a larger gradient is required to develop the glacier profiles observed today.</jats:p> |
| doi_str_mv | 10.3189/172756504781829701 |
| facet_avail | Online, Free |
| finc_class_facet | Geographie, Geologie und Paläontologie |
| 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-aHR0cDovL2R4LmRvaS5vcmcvMTAuMzE4OS8xNzI3NTY1MDQ3ODE4Mjk3MDE |
| imprint | International Glaciological Society, 2004 |
| imprint_str_mv | International Glaciological Society, 2004 |
| institution | DE-D161, DE-Zwi2, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1 |
| issn | 0022-1430, 1727-5652 |
| issn_str_mv | 0022-1430, 1727-5652 |
| language | English |
| last_indexed | 2024-03-01T15:14:34.415Z |
| match_str | fountain2004canclimatewarminginduceglacieradvanceintaylorvalleyantarctica |
| mega_collection | International Glaciological Society (CrossRef) |
| physical | 556-564 |
| publishDate | 2004 |
| publishDateSort | 2004 |
| publisher | International Glaciological Society |
| record_format | ai |
| recordtype | ai |
| series | Journal of Glaciology |
| source_id | 49 |
| spelling | Fountain, Andrew G. Neumann, Thomas A. Glenn, Paul L. Chinn, Trevor 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756504781829701 <jats:title>Abstract</jats:title><jats:p>Changes in the extent of the polar alpine glaciers within Taylor Valley, Antarctica, are important for understanding past climates and past changes in ice-dammed lakes. Comparison of ground-based photographs, taken over a 20 year period, shows glacier advances of 2-100 m. Over the past ~10<jats:sup>3</jats:sup>years the climate has warmed. We hypothesize that an increase in average air temperature alone can explain the observed glacier advance through ice softening. We test this hypothesis by using a flowband model that includes a temperature-dependent softness term. Results show that, for a 2˚C warming, a small glacier (50 km<jats:sup>2</jats:sup>) advances ~25m and the ablation zone thins, consistent with observations. A doubling of snow accumulation would also explain the glacial advance, but predicts ablation-zone thickening, rather than thinning as observed. Problems encountered in modeling glacier flow lead to two intriguing but unresolved issues. First, the current form of the shape factor, which distributes the stress in simple flow models, may need to be revised for polar glaciers. Second, the measured mass-balance gradient in Taylor Valley may be anomalously low, compared to past times, and a larger gradient is required to develop the glacier profiles observed today.</jats:p> Can climate warming induce glacier advance in Taylor Valley, Antarctica? Journal of Glaciology |
| spellingShingle | Fountain, Andrew G., Neumann, Thomas A., Glenn, Paul L., Chinn, Trevor, Journal of Glaciology, Can climate warming induce glacier advance in Taylor Valley, Antarctica?, Earth-Surface Processes |
| title | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_full | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_fullStr | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_full_unstemmed | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_short | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| title_sort | can climate warming induce glacier advance in taylor valley, antarctica? |
| title_unstemmed | Can climate warming induce glacier advance in Taylor Valley, Antarctica? |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756504781829701 |