Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica
Taylor Valley, McMurdo Dry Valleys, East Antarctica contains three perennially ice-covered lakes located in closed basins. The lakes respond to climatic changes on seasonal and decadal scales due to their existence on a very narrow climatic spectrum. The climate has to be sufficiently warm during th...
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ftuillchicagofig:oai:figshare.com:article/10947563 2023-05-15T13:36:58+02:00 Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica Maciej K. Obryk 2014-06-20T00:00:00Z http://hdl.handle.net/10027/18909 https://figshare.com/articles/thesis/Hydrological_and_Biogeochemical_Modeling_of_Taylor_Valley_Lakes_East_Antarctica/10947563 unknown http://hdl.handle.net/10027/18909 https://figshare.com/articles/thesis/Hydrological_and_Biogeochemical_Modeling_of_Taylor_Valley_Lakes_East_Antarctica/10947563 In Copyright Uncategorized Antarctica Limnology Polar desert Text Thesis 2014 ftuillchicagofig 2022-11-19T07:15:27Z Taylor Valley, McMurdo Dry Valleys, East Antarctica contains three perennially ice-covered lakes located in closed basins. The lakes respond to climatic changes on seasonal and decadal scales due to their existence on a very narrow climatic spectrum. The climate has to be sufficiently warm during the austral summer to induce glacial melt yet cold enough to maintain the ice covers year round. This thesis is focused on better understanding and constraining the sensitivity of past and present lakes to changes in climatic forcings. Melt water generation for large proglacial lakes, that existed during the Last Glacial Maximum, is attributed to strong westerly winds that increase surface air temperature above freezing, prolonging the melt season. The high frequency of westerly winds during the Last Glacial Maximum, based on the ice core record from Taylor Dome, is responsible for generation of enough glacial melt to sustain large proglacial lakes during this time period, suggesting that summer surface air temperatures were as warm as present day. Contemporary lakes are much smaller, however, the effect of strong westerly winds on modern lakes is equally profound. Strong winds are responsible for aeolian sediment deposition on the surface of the ice covers. The deposited sediment, on the other hand, absorbs more solar radiation and preferentially decreases the ice thickness around it. The localized ice thinning allows a greater amount of light penetration into the water column, which is negatively correlated with chlorophyll-a concentration. This negative correlation does not indicate changes in biomass; rather, it is a result of the short-term photo-adaptation of phytoplankton to the light intensity by increasing/decreasing light harvesting antenna size. The ice thicknesses in Taylor Valley lakes have been fluctuating since the first measurements were obtained. A one-dimensional physics-based ice thickness model was developed capable of reproducing 16 years of ice thickness trends for two different lakes. The model is ... Thesis Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys polar desert Indigo - University of Illinois at Chicago Austral East Antarctica 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) |
institution |
Open Polar |
collection |
Indigo - University of Illinois at Chicago |
op_collection_id |
ftuillchicagofig |
language |
unknown |
topic |
Uncategorized Antarctica Limnology Polar desert |
spellingShingle |
Uncategorized Antarctica Limnology Polar desert Maciej K. Obryk Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
topic_facet |
Uncategorized Antarctica Limnology Polar desert |
description |
Taylor Valley, McMurdo Dry Valleys, East Antarctica contains three perennially ice-covered lakes located in closed basins. The lakes respond to climatic changes on seasonal and decadal scales due to their existence on a very narrow climatic spectrum. The climate has to be sufficiently warm during the austral summer to induce glacial melt yet cold enough to maintain the ice covers year round. This thesis is focused on better understanding and constraining the sensitivity of past and present lakes to changes in climatic forcings. Melt water generation for large proglacial lakes, that existed during the Last Glacial Maximum, is attributed to strong westerly winds that increase surface air temperature above freezing, prolonging the melt season. The high frequency of westerly winds during the Last Glacial Maximum, based on the ice core record from Taylor Dome, is responsible for generation of enough glacial melt to sustain large proglacial lakes during this time period, suggesting that summer surface air temperatures were as warm as present day. Contemporary lakes are much smaller, however, the effect of strong westerly winds on modern lakes is equally profound. Strong winds are responsible for aeolian sediment deposition on the surface of the ice covers. The deposited sediment, on the other hand, absorbs more solar radiation and preferentially decreases the ice thickness around it. The localized ice thinning allows a greater amount of light penetration into the water column, which is negatively correlated with chlorophyll-a concentration. This negative correlation does not indicate changes in biomass; rather, it is a result of the short-term photo-adaptation of phytoplankton to the light intensity by increasing/decreasing light harvesting antenna size. The ice thicknesses in Taylor Valley lakes have been fluctuating since the first measurements were obtained. A one-dimensional physics-based ice thickness model was developed capable of reproducing 16 years of ice thickness trends for two different lakes. The model is ... |
format |
Thesis |
author |
Maciej K. Obryk |
author_facet |
Maciej K. Obryk |
author_sort |
Maciej K. Obryk |
title |
Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
title_short |
Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
title_full |
Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
title_fullStr |
Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
title_full_unstemmed |
Hydrological and Biogeochemical Modeling of Taylor Valley Lakes, East Antarctica |
title_sort |
hydrological and biogeochemical modeling of taylor valley lakes, east antarctica |
publishDate |
2014 |
url |
http://hdl.handle.net/10027/18909 https://figshare.com/articles/thesis/Hydrological_and_Biogeochemical_Modeling_of_Taylor_Valley_Lakes_East_Antarctica/10947563 |
long_lat |
ENVELOPE(157.667,157.667,-77.667,-77.667) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Austral East Antarctica McMurdo Dry Valleys Taylor Dome Taylor Valley |
geographic_facet |
Austral East Antarctica McMurdo Dry Valleys Taylor Dome Taylor Valley |
genre |
Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys polar desert |
genre_facet |
Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys polar desert |
op_relation |
http://hdl.handle.net/10027/18909 https://figshare.com/articles/thesis/Hydrological_and_Biogeochemical_Modeling_of_Taylor_Valley_Lakes_East_Antarctica/10947563 |
op_rights |
In Copyright |
_version_ |
1766086358456074240 |