Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S)
I use time-constrained sediment volumes delivered by glaciers calving into Marinelli Fjord (55°S), an outlet glacier of the Cordillera Darwin Ice Cap, Southern Patagonia, to determine erosion rates across different timescales. These results indicate that modern sediment yields and erosion rates from...
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ftriceuniv:oai:scholarship.rice.edu:1911/70240 2023-05-15T13:39:43+02:00 Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) Fernandez-Vasquez, Rodrigo Alejandro Anderson, John B. 2012 177 p. application/pdf https://hdl.handle.net/1911/70240 eng eng Fernandez-Vasquez, Rodrigo Alejandro. "Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S)." (2012) Diss., Rice University. https://hdl.handle.net/1911/70240 . https://hdl.handle.net/1911/70240 Fernandez-VasquezR THESIS GEOL. 2012 FERNANDEZ-VASQUEZ Earth sciences Glacial erosion Patagonia Antarctic Peninsula Tidewater glaciers Sediment yields Holocene Marine geology Sedimentary geology Thesis Text 2012 ftriceuniv 2022-08-09T20:29:56Z I use time-constrained sediment volumes delivered by glaciers calving into Marinelli Fjord (55°S), an outlet glacier of the Cordillera Darwin Ice Cap, Southern Patagonia, to determine erosion rates across different timescales. These results indicate that modern sediment yields and erosion rates from temperate tidewater glaciers can exceed long-term values over the time of deglaciation after the LGM (centennial and millennial time scales) by up to two orders of magnitude. In northern Patagonia (Gualas glacier area, 46.5°S), an overall increase in sediment production in the late Holocene is interpreted as result of a sharp increase in centennial timescale precipitation (intensified westerly winds). Erosion rates values span two orders of magnitude from 0.03 mm/yr for Lapeyrere Bay at Anver Island (~64.5°S), up to 1.09 mm/yr for San Rafael glacier at northern Patagonia (~46.5°S). Rates from the Antarctic Peninsula glaciers are in general lower than the temperate Patagonian glaciers. A good correlation of erosion rates and modern (estimated sea level annual 1970 temperature) sea level annual temperature was found. Latitudinal decrease of millenial is interpreted as result of decreasing annual temperature although decreasing in annual precipitation is suggested. The pattern of thermochronology ages from other studies (Thompson et al., 2010; Guenthner et al., 2010), along with the values of 10 3 and 10 6 years timescales erosion rates from this study, indicate that long-term glacial erosion decreases significantly its efficiency with latitude, implying that long-term glacial cover acts as a protective blanket, hindering erosion and allowing mountain growth. We conclude that the pattern of erosion rate decrease with timescale reflects the sensitivity of glaciers to climate variability. Temperate glaciers have higher sensitivity and greater response amplitude to climatic stress than subpolar or polar glaciers. This results in a decrease in erosion rates (sediment production) with latitude, and also in a decrease of ... Thesis Antarc* Antarctic Antarctic Peninsula Ice cap Tidewater Rice University: Digital Scholarship Archive Antarctic Antarctic Peninsula Lapeyrere ENVELOPE(-63.250,-63.250,-64.400,-64.400) Marinelli ENVELOPE(-62.900,-62.900,-64.267,-64.267) Patagonia The Antarctic |
institution |
Open Polar |
collection |
Rice University: Digital Scholarship Archive |
op_collection_id |
ftriceuniv |
language |
English |
topic |
Earth sciences Glacial erosion Patagonia Antarctic Peninsula Tidewater glaciers Sediment yields Holocene Marine geology Sedimentary geology |
spellingShingle |
Earth sciences Glacial erosion Patagonia Antarctic Peninsula Tidewater glaciers Sediment yields Holocene Marine geology Sedimentary geology Fernandez-Vasquez, Rodrigo Alejandro Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
topic_facet |
Earth sciences Glacial erosion Patagonia Antarctic Peninsula Tidewater glaciers Sediment yields Holocene Marine geology Sedimentary geology |
description |
I use time-constrained sediment volumes delivered by glaciers calving into Marinelli Fjord (55°S), an outlet glacier of the Cordillera Darwin Ice Cap, Southern Patagonia, to determine erosion rates across different timescales. These results indicate that modern sediment yields and erosion rates from temperate tidewater glaciers can exceed long-term values over the time of deglaciation after the LGM (centennial and millennial time scales) by up to two orders of magnitude. In northern Patagonia (Gualas glacier area, 46.5°S), an overall increase in sediment production in the late Holocene is interpreted as result of a sharp increase in centennial timescale precipitation (intensified westerly winds). Erosion rates values span two orders of magnitude from 0.03 mm/yr for Lapeyrere Bay at Anver Island (~64.5°S), up to 1.09 mm/yr for San Rafael glacier at northern Patagonia (~46.5°S). Rates from the Antarctic Peninsula glaciers are in general lower than the temperate Patagonian glaciers. A good correlation of erosion rates and modern (estimated sea level annual 1970 temperature) sea level annual temperature was found. Latitudinal decrease of millenial is interpreted as result of decreasing annual temperature although decreasing in annual precipitation is suggested. The pattern of thermochronology ages from other studies (Thompson et al., 2010; Guenthner et al., 2010), along with the values of 10 3 and 10 6 years timescales erosion rates from this study, indicate that long-term glacial erosion decreases significantly its efficiency with latitude, implying that long-term glacial cover acts as a protective blanket, hindering erosion and allowing mountain growth. We conclude that the pattern of erosion rate decrease with timescale reflects the sensitivity of glaciers to climate variability. Temperate glaciers have higher sensitivity and greater response amplitude to climatic stress than subpolar or polar glaciers. This results in a decrease in erosion rates (sediment production) with latitude, and also in a decrease of ... |
author2 |
Anderson, John B. |
format |
Thesis |
author |
Fernandez-Vasquez, Rodrigo Alejandro |
author_facet |
Fernandez-Vasquez, Rodrigo Alejandro |
author_sort |
Fernandez-Vasquez, Rodrigo Alejandro |
title |
Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
title_short |
Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
title_full |
Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
title_fullStr |
Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
title_full_unstemmed |
Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S) |
title_sort |
timescale and latitudinal dependence of glacial erosion rates from patagonia and antarctic peninsula tidewater glaciers (46-65 deg s) |
publishDate |
2012 |
url |
https://hdl.handle.net/1911/70240 |
long_lat |
ENVELOPE(-63.250,-63.250,-64.400,-64.400) ENVELOPE(-62.900,-62.900,-64.267,-64.267) |
geographic |
Antarctic Antarctic Peninsula Lapeyrere Marinelli Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Lapeyrere Marinelli Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice cap Tidewater |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice cap Tidewater |
op_relation |
Fernandez-Vasquez, Rodrigo Alejandro. "Timescale and Latitudinal dependence of Glacial Erosion Rates from Patagonia and Antarctic Peninsula Tidewater Glaciers (46-65 deg S)." (2012) Diss., Rice University. https://hdl.handle.net/1911/70240 . https://hdl.handle.net/1911/70240 Fernandez-VasquezR THESIS GEOL. 2012 FERNANDEZ-VASQUEZ |
_version_ |
1766122528127844352 |