REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF
Arctic sea ice is of great importance as both a key indicator and a driver of climate change. Sea ice is highly sensitive to temperature changes of the overlying atmosphere and the underlying ocean. The declining trend of Arctic sea ice, especially in late summer when seasonal ice extent is also a m...
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ftunivmaryland:oai:drum.lib.umd.edu:1903/28881 2023-05-15T14:34:12+02:00 REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF Eager, Rebecca Nigam, Sumant Ruiz-Barradas, Alfredo Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Atmospheric and Oceanic Sciences 2022 application/pdf http://hdl.handle.net/1903/28881 https://doi.org/10.13016/cqrj-nc0k en eng https://doi.org/10.13016/cqrj-nc0k http://hdl.handle.net/1903/28881 Atmospheric sciences Dissertation 2022 ftunivmaryland https://doi.org/10.13016/cqrj-nc0k 2022-11-20T17:47:22Z Arctic sea ice is of great importance as both a key indicator and a driver of climate change. Sea ice is highly sensitive to temperature changes of the overlying atmosphere and the underlying ocean. The declining trend of Arctic sea ice, especially in late summer when seasonal ice extent is also a minimum, is widely considered a key indicator of the global warming of the planet. This dissertation finds that the observed trends in late summer Arctic sea ice are greatly impacted by natural decadal-to-multidecadal climate variability, mainly by sea surface temperature variability in the Atlantic and Pacific Oceans. The Atlantic Multidecadal Oscillation and Pacific Decadal Variability – via a Pan Pacific mode – each contribute a loss of 3-4% of sea ice concentration (SIC) per decade to the overall loss of 24% per decade since 1979.To better understand the mechanisms driving these trends, the impact of decadal and multidecadal climate variability on the Arctic atmosphere, ocean, and continental hydrology is investigated. Multidecadal climate variability leads to regional and seasonal impacts on atmospheric circulation, ocean heat content, and ocean salinity that vary across the Arctic. Modification of the atmospheric circulation on decadal and multidecadal time scales impacts warm inflow into the Arctic from the North Atlantic and North Pacific, and also leads to redistribution of sea ice in the Arctic. Vertical profiles of ocean temperature and salinity near the mouth of the Arctic rivers provides a means to investigate the impact of variability in continental hydrology on the Arctic marginal seas through the input of freshwater and heat. In the Beaufort Sea, the Atlantic Multidecadal Oscillation leads to increased ocean temperatures and decreased ocean salinity at the mouth of the Mackenzie River, corresponding in time to the annual June peak in river discharge. Finally, the impact of Mackenzie River discharge variability on the freshwater content, temperatures, and SIC in the Beaufort Sea is assessed. Doctoral or Postdoctoral Thesis Arctic Beaufort Sea Climate change Global warming Mackenzie river North Atlantic Sea ice University of Maryland: Digital Repository (DRUM) Arctic Mackenzie River Pacific |
institution |
Open Polar |
collection |
University of Maryland: Digital Repository (DRUM) |
op_collection_id |
ftunivmaryland |
language |
English |
topic |
Atmospheric sciences |
spellingShingle |
Atmospheric sciences Eager, Rebecca REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
topic_facet |
Atmospheric sciences |
description |
Arctic sea ice is of great importance as both a key indicator and a driver of climate change. Sea ice is highly sensitive to temperature changes of the overlying atmosphere and the underlying ocean. The declining trend of Arctic sea ice, especially in late summer when seasonal ice extent is also a minimum, is widely considered a key indicator of the global warming of the planet. This dissertation finds that the observed trends in late summer Arctic sea ice are greatly impacted by natural decadal-to-multidecadal climate variability, mainly by sea surface temperature variability in the Atlantic and Pacific Oceans. The Atlantic Multidecadal Oscillation and Pacific Decadal Variability – via a Pan Pacific mode – each contribute a loss of 3-4% of sea ice concentration (SIC) per decade to the overall loss of 24% per decade since 1979.To better understand the mechanisms driving these trends, the impact of decadal and multidecadal climate variability on the Arctic atmosphere, ocean, and continental hydrology is investigated. Multidecadal climate variability leads to regional and seasonal impacts on atmospheric circulation, ocean heat content, and ocean salinity that vary across the Arctic. Modification of the atmospheric circulation on decadal and multidecadal time scales impacts warm inflow into the Arctic from the North Atlantic and North Pacific, and also leads to redistribution of sea ice in the Arctic. Vertical profiles of ocean temperature and salinity near the mouth of the Arctic rivers provides a means to investigate the impact of variability in continental hydrology on the Arctic marginal seas through the input of freshwater and heat. In the Beaufort Sea, the Atlantic Multidecadal Oscillation leads to increased ocean temperatures and decreased ocean salinity at the mouth of the Mackenzie River, corresponding in time to the annual June peak in river discharge. Finally, the impact of Mackenzie River discharge variability on the freshwater content, temperatures, and SIC in the Beaufort Sea is assessed. |
author2 |
Nigam, Sumant Ruiz-Barradas, Alfredo Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Atmospheric and Oceanic Sciences |
format |
Doctoral or Postdoctoral Thesis |
author |
Eager, Rebecca |
author_facet |
Eager, Rebecca |
author_sort |
Eager, Rebecca |
title |
REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
title_short |
REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
title_full |
REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
title_fullStr |
REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
title_full_unstemmed |
REGIONAL PREFERENCES IN THE SEASONAL AND MULTIDECADAL LOSS OF ARCTIC SEA ICE: THE ROLE OF CONTINENTAL RUNOFF |
title_sort |
regional preferences in the seasonal and multidecadal loss of arctic sea ice: the role of continental runoff |
publishDate |
2022 |
url |
http://hdl.handle.net/1903/28881 https://doi.org/10.13016/cqrj-nc0k |
geographic |
Arctic Mackenzie River Pacific |
geographic_facet |
Arctic Mackenzie River Pacific |
genre |
Arctic Beaufort Sea Climate change Global warming Mackenzie river North Atlantic Sea ice |
genre_facet |
Arctic Beaufort Sea Climate change Global warming Mackenzie river North Atlantic Sea ice |
op_relation |
https://doi.org/10.13016/cqrj-nc0k http://hdl.handle.net/1903/28881 |
op_doi |
https://doi.org/10.13016/cqrj-nc0k |
_version_ |
1766307294404935680 |