Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska
High Arctic permafrosted soils represent a massive sink in the global carbon cycle, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of c...
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fttexasamuniv:oai:repository.tamu.edu:1969.1/149229 2023-05-15T14:59:06+02:00 Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska Schreiner, Kathryn 1983- Bianchi, Thomas S Marcantonio, Franco Boutton, Thomas Yvon-Lewis, Shari 2013-10-02T21:26:40Z application/pdf http://hdl.handle.net/1969.1/149229 unknown http://hdl.handle.net/1969.1/149229 Beaufort Sea sedimentary organic carbon particulate organic carbon radiocarbon compound specific isotope analysis Alaska climate change lignin-phenols Colville River Thesis text 2013 fttexasamuniv 2015-05-02T22:10:36Z High Arctic permafrosted soils represent a massive sink in the global carbon cycle, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This dissertation summarizes the results of the first study to look at long term, fine scale organic carbon delivery by the high-Arctic Colville River into Simpson?s Lagoon in the near-shore Beaufort Sea. Modern delivery of organic carbon to the Lagoon was determined to come from a variety of sources through the use of a three end-member mixing model and sediment biomarker concentrations. These sources include the Colville River in the western area of the Lagoon near the river mouth, marine sources in areas of the Lagoon without protective barrier islands, and coastal erosional sources and the Mackenzie River in the eastern area of the Lagoon. Downcore organic carbon delivery was measured on two cores in the Lagoon, one taken near the mouth of the Colville River (spans about 1800 years of history) and one taken on the eastern end of the Lagoon (spans about 600 years of history). Bulk organic parameters and biomarkers were measured in both cores and analyzed with Principle Component Analysis to determine long-term trends in organic carbon delivery. It was shown that at various times in the past, highly degraded organic carbon inputs of what is likely soil and peat carbon were delivered to the Lagoon. At other times, inputs of fresher, non-degraded, terrestrially-derived organic carbon inputs of what are likely higher amounts of plant and vegetative material was delivered to the Lagoon. Inputs of degraded soil carbon were also shown to correspond to higher temperatures on the North Slope of Alaska, likely indicating that warmer temperatures lead to a thawing of permafrost and in turn organic carbon mobilization to the coastal Beaufort Sea. Thesis Arctic Beaufort Sea Climate change Mackenzie river north slope permafrost Alaska Texas A&M University Digital Repository Arctic Mackenzie River Barrier Islands ENVELOPE(-92.283,-92.283,62.784,62.784) |
institution |
Open Polar |
collection |
Texas A&M University Digital Repository |
op_collection_id |
fttexasamuniv |
language |
unknown |
topic |
Beaufort Sea sedimentary organic carbon particulate organic carbon radiocarbon compound specific isotope analysis Alaska climate change lignin-phenols Colville River |
spellingShingle |
Beaufort Sea sedimentary organic carbon particulate organic carbon radiocarbon compound specific isotope analysis Alaska climate change lignin-phenols Colville River Schreiner, Kathryn 1983- Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
topic_facet |
Beaufort Sea sedimentary organic carbon particulate organic carbon radiocarbon compound specific isotope analysis Alaska climate change lignin-phenols Colville River |
description |
High Arctic permafrosted soils represent a massive sink in the global carbon cycle, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This dissertation summarizes the results of the first study to look at long term, fine scale organic carbon delivery by the high-Arctic Colville River into Simpson?s Lagoon in the near-shore Beaufort Sea. Modern delivery of organic carbon to the Lagoon was determined to come from a variety of sources through the use of a three end-member mixing model and sediment biomarker concentrations. These sources include the Colville River in the western area of the Lagoon near the river mouth, marine sources in areas of the Lagoon without protective barrier islands, and coastal erosional sources and the Mackenzie River in the eastern area of the Lagoon. Downcore organic carbon delivery was measured on two cores in the Lagoon, one taken near the mouth of the Colville River (spans about 1800 years of history) and one taken on the eastern end of the Lagoon (spans about 600 years of history). Bulk organic parameters and biomarkers were measured in both cores and analyzed with Principle Component Analysis to determine long-term trends in organic carbon delivery. It was shown that at various times in the past, highly degraded organic carbon inputs of what is likely soil and peat carbon were delivered to the Lagoon. At other times, inputs of fresher, non-degraded, terrestrially-derived organic carbon inputs of what are likely higher amounts of plant and vegetative material was delivered to the Lagoon. Inputs of degraded soil carbon were also shown to correspond to higher temperatures on the North Slope of Alaska, likely indicating that warmer temperatures lead to a thawing of permafrost and in turn organic carbon mobilization to the coastal Beaufort Sea. |
author2 |
Bianchi, Thomas S Marcantonio, Franco Boutton, Thomas Yvon-Lewis, Shari |
format |
Thesis |
author |
Schreiner, Kathryn 1983- |
author_facet |
Schreiner, Kathryn 1983- |
author_sort |
Schreiner, Kathryn 1983- |
title |
Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
title_short |
Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
title_full |
Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
title_fullStr |
Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
title_full_unstemmed |
Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska |
title_sort |
paleoreconstruction of particulate organic carbon inputs to the high-arctic colville river delta, beaufort sea, alaska |
publishDate |
2013 |
url |
http://hdl.handle.net/1969.1/149229 |
long_lat |
ENVELOPE(-92.283,-92.283,62.784,62.784) |
geographic |
Arctic Mackenzie River Barrier Islands |
geographic_facet |
Arctic Mackenzie River Barrier Islands |
genre |
Arctic Beaufort Sea Climate change Mackenzie river north slope permafrost Alaska |
genre_facet |
Arctic Beaufort Sea Climate change Mackenzie river north slope permafrost Alaska |
op_relation |
http://hdl.handle.net/1969.1/149229 |
_version_ |
1766331242945445888 |