A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core
The Little Ice Age (LIA) (1400-1850 AD) represents one of the most significant climatic shifts over the past 5000 years. Previous studies from Antarctica indicate generally cooler and stormier conditions during this period, but this pattern shows distinct spatial and temporal variability. The Roosev...
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ftvictoriauwfig:oai:figshare.com:article/17060279 2023-05-15T13:35:14+02:00 A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core Brightley, Hannah 2017-01-01T00:00:00Z https://doi.org/10.26686/wgtn.17060279.v1 https://figshare.com/articles/thesis/A_Paleoclimate_Reconstruction_of_the_Little_Ice_Age_to_Modern_Era_Climate_Conditions_in_the_Eastern_Ross_Sea_Antarctica_as_Captured_in_the_RICE_Ice_Core/17060279 unknown doi:10.26686/wgtn.17060279.v1 https://figshare.com/articles/thesis/A_Paleoclimate_Reconstruction_of_the_Little_Ice_Age_to_Modern_Era_Climate_Conditions_in_the_Eastern_Ross_Sea_Antarctica_as_Captured_in_the_RICE_Ice_Core/17060279 Author Retains Copyright Palaeoclimatology Little Ice Age Antarctica Paleoclimate School: School of Geography Environment and Earth Sciences Unit: Antarctic Research Centre 040605 Palaeoclimatology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science Text Thesis 2017 ftvictoriauwfig https://doi.org/10.26686/wgtn.17060279.v1 2021-11-25T00:04:12Z The Little Ice Age (LIA) (1400-1850 AD) represents one of the most significant climatic shifts over the past 5000 years. Previous studies from Antarctica indicate generally cooler and stormier conditions during this period, but this pattern shows distinct spatial and temporal variability. The Roosevelt Island Climate Evolution (RICE) ice core provides a new opportunity to study the drivers behind this variability at annual/seasonal resolution, in a relatively under-sampled and climatically sensitive region in the eastern Ross Sea. Contrary to previous studies, isotope measurements suggest warm conditions during the LIA at Roosevelt Island. This study presents analysis of eight major ions (Na⁺, Mg²⁺, Ca²⁺, K⁺, MS⁻, Cl⁻, NO₃⁻, SO₄²⁻) using both Ion Chromatograph and ICP-MS data, in order to reconstruct the atmospheric circulation pattern, sea ice extent and marine primary productivity across this LIA to Modern Era (ME) at Roosevelt Island. The dataset is tied to a robust age model allowing annual dating and the opportunity to accurately reconstruct rates of change during this ME-LIA. Challenges revolving around the calibration of the Ion Chromatograph are also discussed. The major ion record determines whether the lack of cooling in the Roosevelt Island core implied by the stable isotopes represents a true temperature anomaly or whether the atmospheric circulation pattern caused an isotopic enrichment that masks an underlying cooling. It was determined that Roosevelt Island experienced during the LIA (i) an increase in marine air mass intrusions along with weaker katabatic winds compared to the 200 years prior, (ii) decreased biological productivity and (iii) increased sea ice. From the 1850-1880s to 1992 AD, there is a shift to reduced marine winds, increased katabatics, increased biological productivity and decreased sea ice until 1992. In the wider Ross Sea context, this suggests an east-west divide in terms of the dominance of katabatics versus marine wind influence. This divide is attributed with the warming ... Thesis Antarc* Antarctic Antarctica ice core Roosevelt Island Ross Sea Sea ice Open Access Victoria University of Wellington / Te Herenga Waka Antarctic Ross Sea Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
institution |
Open Polar |
collection |
Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Palaeoclimatology Little Ice Age Antarctica Paleoclimate School: School of Geography Environment and Earth Sciences Unit: Antarctic Research Centre 040605 Palaeoclimatology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science |
spellingShingle |
Palaeoclimatology Little Ice Age Antarctica Paleoclimate School: School of Geography Environment and Earth Sciences Unit: Antarctic Research Centre 040605 Palaeoclimatology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science Brightley, Hannah A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
topic_facet |
Palaeoclimatology Little Ice Age Antarctica Paleoclimate School: School of Geography Environment and Earth Sciences Unit: Antarctic Research Centre 040605 Palaeoclimatology Degree Discipline: Geology Degree Level: Masters Degree Name: Master of Science |
description |
The Little Ice Age (LIA) (1400-1850 AD) represents one of the most significant climatic shifts over the past 5000 years. Previous studies from Antarctica indicate generally cooler and stormier conditions during this period, but this pattern shows distinct spatial and temporal variability. The Roosevelt Island Climate Evolution (RICE) ice core provides a new opportunity to study the drivers behind this variability at annual/seasonal resolution, in a relatively under-sampled and climatically sensitive region in the eastern Ross Sea. Contrary to previous studies, isotope measurements suggest warm conditions during the LIA at Roosevelt Island. This study presents analysis of eight major ions (Na⁺, Mg²⁺, Ca²⁺, K⁺, MS⁻, Cl⁻, NO₃⁻, SO₄²⁻) using both Ion Chromatograph and ICP-MS data, in order to reconstruct the atmospheric circulation pattern, sea ice extent and marine primary productivity across this LIA to Modern Era (ME) at Roosevelt Island. The dataset is tied to a robust age model allowing annual dating and the opportunity to accurately reconstruct rates of change during this ME-LIA. Challenges revolving around the calibration of the Ion Chromatograph are also discussed. The major ion record determines whether the lack of cooling in the Roosevelt Island core implied by the stable isotopes represents a true temperature anomaly or whether the atmospheric circulation pattern caused an isotopic enrichment that masks an underlying cooling. It was determined that Roosevelt Island experienced during the LIA (i) an increase in marine air mass intrusions along with weaker katabatic winds compared to the 200 years prior, (ii) decreased biological productivity and (iii) increased sea ice. From the 1850-1880s to 1992 AD, there is a shift to reduced marine winds, increased katabatics, increased biological productivity and decreased sea ice until 1992. In the wider Ross Sea context, this suggests an east-west divide in terms of the dominance of katabatics versus marine wind influence. This divide is attributed with the warming ... |
format |
Thesis |
author |
Brightley, Hannah |
author_facet |
Brightley, Hannah |
author_sort |
Brightley, Hannah |
title |
A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
title_short |
A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
title_full |
A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
title_fullStr |
A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
title_full_unstemmed |
A Paleoclimate Reconstruction of the Little Ice Age to Modern Era Climate Conditions in the Eastern Ross Sea, Antarctica as Captured in the RICE Ice Core |
title_sort |
paleoclimate reconstruction of the little ice age to modern era climate conditions in the eastern ross sea, antarctica as captured in the rice ice core |
publishDate |
2017 |
url |
https://doi.org/10.26686/wgtn.17060279.v1 https://figshare.com/articles/thesis/A_Paleoclimate_Reconstruction_of_the_Little_Ice_Age_to_Modern_Era_Climate_Conditions_in_the_Eastern_Ross_Sea_Antarctica_as_Captured_in_the_RICE_Ice_Core/17060279 |
long_lat |
ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
geographic |
Antarctic Ross Sea Roosevelt Island |
geographic_facet |
Antarctic Ross Sea Roosevelt Island |
genre |
Antarc* Antarctic Antarctica ice core Roosevelt Island Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica ice core Roosevelt Island Ross Sea Sea ice |
op_relation |
doi:10.26686/wgtn.17060279.v1 https://figshare.com/articles/thesis/A_Paleoclimate_Reconstruction_of_the_Little_Ice_Age_to_Modern_Era_Climate_Conditions_in_the_Eastern_Ross_Sea_Antarctica_as_Captured_in_the_RICE_Ice_Core/17060279 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.17060279.v1 |
_version_ |
1766063301557485568 |