Salvato in:
| Autori principali: | , , , , , , , , , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2011
|
| Soggetti: | |
| Accesso online: | https://doi.org/10.1594/PANGAEA.859024 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867170990170046464 |
|---|---|
| author | Watcham, Emma P Bentley, Michael J Hodgson, Dominic A Roberts, Stephen J Fretwell, Peter Lloyd, Jerry M Larter, Robert D Whitehouse, Pippa L Leng, Melanie J Monien, Patrick Moreton, Steven Grahame |
| author_facet | Watcham, Emma P Bentley, Michael J Hodgson, Dominic A Roberts, Stephen J Fretwell, Peter Lloyd, Jerry M Larter, Robert D Whitehouse, Pippa L Leng, Melanie J Monien, Patrick Moreton, Steven Grahame |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Precise relative sea level (RSL) data are important for inferring regional ice sheet histories, as well as helping to validate numerical models of ice sheet evolution and glacial isostatic adjustment. Here we develop a new RSL curve for Fildes Peninsula, South Shetland Islands (SSIs), a sub-Antarctic archipelago peripheral to the northern Antarctic Peninsula ice sheet, by integrating sedimentary evidence from isolation basins with geomorphological evidence from raised beaches. This combined approach yields not only a Holocene RSL curve, but also the spatial pattern of how RSL change varied across the archipelago. The curve shows a mid-Holocene RSL highstand on Fildes Peninsula at 15.5 m above mean sea level between 8000 and 7000 cal a BP. Subsequently RSL gradually fell as a consequence of isostatic uplift in response to regional deglaciation. We propose that isostatic uplift occurred at a non-steady rate, with a temporary pause in ice retreat ca. 7200 cal a BP, leading to a short-lived RSL rise of ~1 m and forming a second peak to the mid-Holocene highstand. Two independent approaches were taken to constrain the long-term tectonic uplift rate of the SSIs at 0.22-0.48 m/ka, placing the tectonic contribution to the reconstructed RSL highstand between 1.4 and 2.9 m. Finally, we make comparisons to predictions from three global sea level models. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_859024 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 2) Radiocarbon dates from lakes on Fildes Peninsula, King George Island Watcham, Emma P Bentley, Michael J Hodgson, Dominic A Roberts, Stephen J Fretwell, Peter Lloyd, Jerry M Larter, Robert D Whitehouse, Pippa L Leng, Melanie J Monien, Patrick Moreton, Steven Grahame Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993); Age, 14C milieu/reservoir corrected (Milliken et al., 2009); Age, AMS 14C conventional; Age, dated; Age, dated, standard deviation; Age, dated material; Ardley_lake; Belen_lake; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Comment of event; Core; CORE; Event label; Fildes Peninsula, King George Island; Gaoshan_lake; Laboratory; Laguna_Tern, Lake_Albatross; Lake_Shanhaicuan; Latitude of event; Long_lake; Longitude of event; Ozero_Dlinnoye; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Probability; Sample ID; SPP1158; Yanou_lake; Yue_Ya_Hu, Laguna_Ripamonti; δ13C Precise relative sea level (RSL) data are important for inferring regional ice sheet histories, as well as helping to validate numerical models of ice sheet evolution and glacial isostatic adjustment. Here we develop a new RSL curve for Fildes Peninsula, South Shetland Islands (SSIs), a sub-Antarctic archipelago peripheral to the northern Antarctic Peninsula ice sheet, by integrating sedimentary evidence from isolation basins with geomorphological evidence from raised beaches. This combined approach yields not only a Holocene RSL curve, but also the spatial pattern of how RSL change varied across the archipelago. The curve shows a mid-Holocene RSL highstand on Fildes Peninsula at 15.5 m above mean sea level between 8000 and 7000 cal a BP. Subsequently RSL gradually fell as a consequence of isostatic uplift in response to regional deglaciation. We propose that isostatic uplift occurred at a non-steady rate, with a temporary pause in ice retreat ca. 7200 cal a BP, leading to a short-lived RSL rise of ~1 m and forming a second peak to the mid-Holocene highstand. Two independent approaches were taken to constrain the long-term tectonic uplift rate of the SSIs at 0.22-0.48 m/ka, placing the tectonic contribution to the reconstructed RSL highstand between 1.4 and 2.9 m. Finally, we make comparisons to predictions from three global sea level models. |
| title | (Table 2) Radiocarbon dates from lakes on Fildes Peninsula, King George Island |
| topic | Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993); Age, 14C milieu/reservoir corrected (Milliken et al., 2009); Age, AMS 14C conventional; Age, dated; Age, dated, standard deviation; Age, dated material; Ardley_lake; Belen_lake; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Comment of event; Core; CORE; Event label; Fildes Peninsula, King George Island; Gaoshan_lake; Laboratory; Laguna_Tern, Lake_Albatross; Lake_Shanhaicuan; Latitude of event; Long_lake; Longitude of event; Ozero_Dlinnoye; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Probability; Sample ID; SPP1158; Yanou_lake; Yue_Ya_Hu, Laguna_Ripamonti; δ13C |
| url | https://doi.org/10.1594/PANGAEA.859024 |