Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia
Advisors: Nathan D. Stansell. Committee members: Justin Dodd; Eric Klein. Includes bibliographical references. Includes illustrations and maps. Oxygen isotopes derived from authigenic carbonate from open lake systems record variations in seasonal precipitation source. This study focuses on the sedim...
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ftnorthillinuni:oai:commons.lib.niu.edu:10843/20861 2023-05-15T17:27:25+02:00 Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia Fortney, Carolyn Stansell, Nathan D. Department of Geology and Environmental Geosciences 2016 vii, 138 pages application/pdf https://commons.lib.niu.edu/handle/10843/20861 eng eng Northern Illinois University https://commons.lib.niu.edu/handle/10843/20861 NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. North Atlantic Ocean--Climate|Paleoclimatology--Estonia--Holocene Precipitation variability--Estonia North Atlantic oscillation--Environmental aspects Text Dissertation/Thesis 2016 ftnorthillinuni 2020-09-22T08:43:13Z Advisors: Nathan D. Stansell. Committee members: Justin Dodd; Eric Klein. Includes bibliographical references. Includes illustrations and maps. Oxygen isotopes derived from authigenic carbonate from open lake systems record variations in seasonal precipitation source. This study focuses on the sediment record from Lake Nuudsaku in southern Estonia to evaluate how winter versus summer precipitation has changed throughout the Holocene as a result of fluctuating North Atlantic Ocean conditions, primarily the North Atlantic Oscillation (NAO). Estonia receives precipitation with a lower [delta]¹⁸O value from the North Atlantic and Baltic Sea during the winter months. In contrast, during the summer months Estonia receives precipitation with greater [delta]¹⁸O values from warmer North Atlantic waters and from the Mediterranean Sea and Black Sea. Therefore, lower [delta]¹⁸O values in the carbonate record were interpreted as periods of time in which there were increases in the amount of winter precipitation. Oxygen isotope data indicate relatively wet winters during the early Holocene (9960 to 8800 cal yr BP) followed by a shift toward drier winters during the middle of the Holocene (8800 to 4200 cal yr BP). The late Holocene (4200 cal yr BP to the present) was characterized by the wettest winters recorded in the oxygen isotope record. The periods of increased winter precipitation in the Baltic region generally coincided with periods of increased NAO index between 5200 cal yr BP and 1000 cal yr BP. There was an inverse relationship between winter precipitation and NAO index during the Medieval Climate Anomaly and the Little Ice Age (900 to 100 cal yr BP). The positive relationship between NAO index and winter precipitation in Northern Europe is present once again in the modern setting and has persisted since at least AD 1950. M.S. (Master of Science) Thesis North Atlantic North Atlantic oscillation Northern Illinois University (NIU): Huskie Commons Repository |
institution |
Open Polar |
collection |
Northern Illinois University (NIU): Huskie Commons Repository |
op_collection_id |
ftnorthillinuni |
language |
English |
topic |
North Atlantic Ocean--Climate|Paleoclimatology--Estonia--Holocene Precipitation variability--Estonia North Atlantic oscillation--Environmental aspects |
spellingShingle |
North Atlantic Ocean--Climate|Paleoclimatology--Estonia--Holocene Precipitation variability--Estonia North Atlantic oscillation--Environmental aspects Fortney, Carolyn Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
topic_facet |
North Atlantic Ocean--Climate|Paleoclimatology--Estonia--Holocene Precipitation variability--Estonia North Atlantic oscillation--Environmental aspects |
description |
Advisors: Nathan D. Stansell. Committee members: Justin Dodd; Eric Klein. Includes bibliographical references. Includes illustrations and maps. Oxygen isotopes derived from authigenic carbonate from open lake systems record variations in seasonal precipitation source. This study focuses on the sediment record from Lake Nuudsaku in southern Estonia to evaluate how winter versus summer precipitation has changed throughout the Holocene as a result of fluctuating North Atlantic Ocean conditions, primarily the North Atlantic Oscillation (NAO). Estonia receives precipitation with a lower [delta]¹⁸O value from the North Atlantic and Baltic Sea during the winter months. In contrast, during the summer months Estonia receives precipitation with greater [delta]¹⁸O values from warmer North Atlantic waters and from the Mediterranean Sea and Black Sea. Therefore, lower [delta]¹⁸O values in the carbonate record were interpreted as periods of time in which there were increases in the amount of winter precipitation. Oxygen isotope data indicate relatively wet winters during the early Holocene (9960 to 8800 cal yr BP) followed by a shift toward drier winters during the middle of the Holocene (8800 to 4200 cal yr BP). The late Holocene (4200 cal yr BP to the present) was characterized by the wettest winters recorded in the oxygen isotope record. The periods of increased winter precipitation in the Baltic region generally coincided with periods of increased NAO index between 5200 cal yr BP and 1000 cal yr BP. There was an inverse relationship between winter precipitation and NAO index during the Medieval Climate Anomaly and the Little Ice Age (900 to 100 cal yr BP). The positive relationship between NAO index and winter precipitation in Northern Europe is present once again in the modern setting and has persisted since at least AD 1950. M.S. (Master of Science) |
author2 |
Stansell, Nathan D. Department of Geology and Environmental Geosciences |
format |
Thesis |
author |
Fortney, Carolyn |
author_facet |
Fortney, Carolyn |
author_sort |
Fortney, Carolyn |
title |
Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
title_short |
Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
title_full |
Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
title_fullStr |
Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
title_full_unstemmed |
Evaluating Holocene precipitation variability in the Baltic region using oxygen isotopes of lacustrine carbonate from Estonia |
title_sort |
evaluating holocene precipitation variability in the baltic region using oxygen isotopes of lacustrine carbonate from estonia |
publisher |
Northern Illinois University |
publishDate |
2016 |
url |
https://commons.lib.niu.edu/handle/10843/20861 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://commons.lib.niu.edu/handle/10843/20861 |
op_rights |
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. |
_version_ |
1766119486628298752 |