دورية أكاديمية
Triggers of the 2022 Larsen B multi-year landfast sea ice breakout and initial glacier response
| العنوان: | Triggers of the 2022 Larsen B multi-year landfast sea ice breakout and initial glacier response |
|---|---|
| المؤلفون: | N. E. Ochwat, T. A. Scambos, A. F. Banwell, R. S. Anderson, M. L. Maclennan, G. Picard, J. A. Shates, S. Marinsek, L. Margonari, M. Truffer, E. C. Pettit |
| المصدر: | The Cryosphere, Vol 18, Pp 1709-1731 (2024) |
| بيانات النشر: | Copernicus Publications, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Environmental sciences LCC:Geology |
| مصطلحات موضوعية: | Environmental sciences, GE1-350, Geology, QE1-996.5 |
| الوصف: | In late March 2011, landfast sea ice (hereafter, “fast ice”) formed in the northern Larsen B embayment and persisted continuously as multi-year fast ice until January 2022. In the 11 years of fast-ice presence, the northern Larsen B glaciers slowed significantly, thickened in their lower reaches, and developed extensive mélange areas, leading to the formation of ice tongues that extended up to 16 km from the 2011 ice fronts. In situ measurements of ice speed on adjacent ice shelf areas spanning 2011 to 2017 show that the fast ice provided significant resistive stress to ice flow. Fast-ice breakout began in late January 2022 and was closely followed by retreat and breakup of both the fast-ice mélange and the glacier ice tongues. We investigate the probable triggers for the loss of fast ice and document the initial upstream glacier responses. The fast-ice breakup is linked to the arrival of a strong ocean swell event (>1.5 m amplitude; wave period waves >5 s) originating from the northeast. Wave propagation to the ice front was facilitated by a 12-year low in sea ice concentration in the northwestern Weddell Sea, creating a near-ice-free corridor to the open ocean. Remote sensing data in the months following the fast-ice breakout reveals an initial ice flow speed increase (>2-fold), elevation loss (9 to 11 m), and rapid calving of floating and grounded ice for the three main embayment glaciers Crane (11 km), Hektoria (25 km), and Green (18 km). |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1994-0416 1994-0424 |
| Relation: | https://tc.copernicus.org/articles/18/1709/2024/tc-18-1709-2024.pdf; https://doaj.org/toc/1994-0416; https://doaj.org/toc/1994-0424 |
| DOI: | 10.5194/tc-18-1709-2024 |
| URL الوصول: | https://doaj.org/article/dbba9d391c7840f1b1fc0cca23ec7d9b |
| رقم الأكسشن: | edsdoj.bba9d391c7840f1b1fc0cca23ec7d9b |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 19940416 19940424 |
|---|---|
| DOI: | 10.5194/tc-18-1709-2024 |