Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey
Previous studies of the lakes of the McMurdo Dry Valleys have attempted to constrain lake level history, and results suggest the lakes have undergone hundreds of meters of lake level change within the last 20 000 years. Past studies have utilized the interpretation of geologic deposits, lake chemist...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-15-3577-2021 https://doaj.org/article/e9cafb2d9a644f4cb00564c07869c059 |
id |
ftdoajarticles:oai:doaj.org/article:e9cafb2d9a644f4cb00564c07869c059 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:e9cafb2d9a644f4cb00564c07869c059 2023-05-15T13:44:23+02:00 Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey K. F. Myers P. T. Doran S. M. Tulaczyk N. T. Foley T. S. Bording E. Auken H. A. Dugan J. A. Mikucki N. Foged D. Grombacher R. A. Virginia 2021-08-01T00:00:00Z https://doi.org/10.5194/tc-15-3577-2021 https://doaj.org/article/e9cafb2d9a644f4cb00564c07869c059 EN eng Copernicus Publications https://tc.copernicus.org/articles/15/3577/2021/tc-15-3577-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-3577-2021 1994-0416 1994-0424 https://doaj.org/article/e9cafb2d9a644f4cb00564c07869c059 The Cryosphere, Vol 15, Pp 3577-3593 (2021) Environmental sciences GE1-350 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/tc-15-3577-2021 2022-12-31T07:05:46Z Previous studies of the lakes of the McMurdo Dry Valleys have attempted to constrain lake level history, and results suggest the lakes have undergone hundreds of meters of lake level change within the last 20 000 years. Past studies have utilized the interpretation of geologic deposits, lake chemistry, and ice sheet history to deduce lake level history; however a substantial amount of disagreement remains between the findings, indicating a need for further investigation using new techniques. This study utilizes a regional airborne resistivity survey to provide novel insight into the paleohydrology of the region. Mean resistivity maps revealed an extensive brine beneath the Lake Fryxell basin, which is interpreted as a legacy groundwater signal from higher lake levels in the past. Resistivity data suggest that active permafrost formation has been ongoing since the onset of lake drainage and that as recently as 1500–4000 years BP, lake levels were over 60 m higher than present. This coincides with a warmer-than-modern paleoclimate throughout the Holocene inferred by the nearby Taylor Dome ice core record. Our results indicate Mid to Late Holocene lake level high stands, which runs counter to previous research finding a colder and drier era with little hydrologic activity throughout the last 5000 years. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice ice core Ice Sheet McMurdo Dry Valleys permafrost The Cryosphere Directory of Open Access Journals: DOAJ Articles East Antarctica Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) McMurdo Dry Valleys Taylor Dome ENVELOPE(157.667,157.667,-77.667,-77.667) Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) The Cryosphere 15 8 3577 3593 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 K. F. Myers P. T. Doran S. M. Tulaczyk N. T. Foley T. S. Bording E. Auken H. A. Dugan J. A. Mikucki N. Foged D. Grombacher R. A. Virginia Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Previous studies of the lakes of the McMurdo Dry Valleys have attempted to constrain lake level history, and results suggest the lakes have undergone hundreds of meters of lake level change within the last 20 000 years. Past studies have utilized the interpretation of geologic deposits, lake chemistry, and ice sheet history to deduce lake level history; however a substantial amount of disagreement remains between the findings, indicating a need for further investigation using new techniques. This study utilizes a regional airborne resistivity survey to provide novel insight into the paleohydrology of the region. Mean resistivity maps revealed an extensive brine beneath the Lake Fryxell basin, which is interpreted as a legacy groundwater signal from higher lake levels in the past. Resistivity data suggest that active permafrost formation has been ongoing since the onset of lake drainage and that as recently as 1500–4000 years BP, lake levels were over 60 m higher than present. This coincides with a warmer-than-modern paleoclimate throughout the Holocene inferred by the nearby Taylor Dome ice core record. Our results indicate Mid to Late Holocene lake level high stands, which runs counter to previous research finding a colder and drier era with little hydrologic activity throughout the last 5000 years. |
format |
Article in Journal/Newspaper |
author |
K. F. Myers P. T. Doran S. M. Tulaczyk N. T. Foley T. S. Bording E. Auken H. A. Dugan J. A. Mikucki N. Foged D. Grombacher R. A. Virginia |
author_facet |
K. F. Myers P. T. Doran S. M. Tulaczyk N. T. Foley T. S. Bording E. Auken H. A. Dugan J. A. Mikucki N. Foged D. Grombacher R. A. Virginia |
author_sort |
K. F. Myers |
title |
Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
title_short |
Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
title_full |
Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
title_fullStr |
Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
title_full_unstemmed |
Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey |
title_sort |
thermal legacy of a large paleolake in taylor valley, east antarctica, as evidenced by an airborne electromagnetic survey |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-3577-2021 https://doaj.org/article/e9cafb2d9a644f4cb00564c07869c059 |
long_lat |
ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(157.667,157.667,-77.667,-77.667) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
East Antarctica Fryxell Lake Fryxell McMurdo Dry Valleys Taylor Dome Taylor Valley |
geographic_facet |
East Antarctica Fryxell Lake Fryxell McMurdo Dry Valleys Taylor Dome Taylor Valley |
genre |
Antarc* Antarctica East Antarctica Ice ice core Ice Sheet McMurdo Dry Valleys permafrost The Cryosphere |
genre_facet |
Antarc* Antarctica East Antarctica Ice ice core Ice Sheet McMurdo Dry Valleys permafrost The Cryosphere |
op_source |
The Cryosphere, Vol 15, Pp 3577-3593 (2021) |
op_relation |
https://tc.copernicus.org/articles/15/3577/2021/tc-15-3577-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-3577-2021 1994-0416 1994-0424 https://doaj.org/article/e9cafb2d9a644f4cb00564c07869c059 |
op_doi |
https://doi.org/10.5194/tc-15-3577-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
8 |
container_start_page |
3577 |
op_container_end_page |
3593 |
_version_ |
1766201140954791936 |