Influence of solar activity and environment on 10Be in recent natural archives

Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. Variations in solar act...

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Main Author: Berggren, Ann-Marie
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: Uppsala universitet, Luft-, vatten- och landskapslära 2009
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-103031
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spelling ftuppsalauniv:oai:DiVA.org:uu-103031 2023-05-15T16:30:10+02:00 Influence of solar activity and environment on 10Be in recent natural archives Berggren, Ann-Marie 2009 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-103031 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Uppsala : Acta Universitatis Upsaliensis Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 654 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-103031 urn:isbn:978-91-554-7549-9 info:eu-repo/semantics/openAccess cosmogenic isotopes beryllium ice cores varved lake sediments accelerator mass spectrometry co-precipitation Geology Geologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2009 ftuppsalauniv 2023-02-23T21:58:03Z Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. Variations in solar activity modulate the amount of incoming cosmic rays, and thereby cosmogenic isotope production. Atmospherically produced 10Be enters natural archives such as sediments and glaciers by wet and dry deposition within about a year of production. 10Be from natural archives therefore provides information on past solar activity, and because these archives also contain climate information, solar activity and climate can be linked. One remaining question is to what degree 10Be in natural archives reflects production, and to what extent the local and regional environment overprints the production signal. To explore this, 10Be was measured at annual resolution over the last 600 years in a Greenland ice core. Measurement potentials for these samples benefited from the development of a new laboratory method of co-precipitating 10Be with niobium. To diversify geographic location and archive media type, a pioneer study of measuring 10Be with annual resolution in varved lake sediments from Finland was conducted, with samples from the entire 20th century. Pathways of 10Be into lake sediments are more complex than into glacial ice, inferring that contemporary atmospheric conditions may not be recorded. Here, it is shown for the first time that tracing the 11-year solar cycle through lake sediment 10Be variations is possible. Results also show that on an annual basis, 10Be deposition in ice and sediment archives is affected by local environmental conditions. On a slightly longer timescale, however, diverse 10Be records exhibit similar trends and a negative correlation with solar activity. Cyclic variability of 10Be deposition persisted throughout past grand solar minima, when little or no sunspot activity was recorded. 10Be levels ... Doctoral or Postdoctoral Thesis Greenland Greenland ice core ice core Uppsala University: Publications (DiVA) Greenland
institution Open Polar
collection Uppsala University: Publications (DiVA)
op_collection_id ftuppsalauniv
language English
topic cosmogenic isotopes
beryllium
ice cores
varved lake sediments
accelerator mass spectrometry
co-precipitation
Geology
Geologi
spellingShingle cosmogenic isotopes
beryllium
ice cores
varved lake sediments
accelerator mass spectrometry
co-precipitation
Geology
Geologi
Berggren, Ann-Marie
Influence of solar activity and environment on 10Be in recent natural archives
topic_facet cosmogenic isotopes
beryllium
ice cores
varved lake sediments
accelerator mass spectrometry
co-precipitation
Geology
Geologi
description Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. Variations in solar activity modulate the amount of incoming cosmic rays, and thereby cosmogenic isotope production. Atmospherically produced 10Be enters natural archives such as sediments and glaciers by wet and dry deposition within about a year of production. 10Be from natural archives therefore provides information on past solar activity, and because these archives also contain climate information, solar activity and climate can be linked. One remaining question is to what degree 10Be in natural archives reflects production, and to what extent the local and regional environment overprints the production signal. To explore this, 10Be was measured at annual resolution over the last 600 years in a Greenland ice core. Measurement potentials for these samples benefited from the development of a new laboratory method of co-precipitating 10Be with niobium. To diversify geographic location and archive media type, a pioneer study of measuring 10Be with annual resolution in varved lake sediments from Finland was conducted, with samples from the entire 20th century. Pathways of 10Be into lake sediments are more complex than into glacial ice, inferring that contemporary atmospheric conditions may not be recorded. Here, it is shown for the first time that tracing the 11-year solar cycle through lake sediment 10Be variations is possible. Results also show that on an annual basis, 10Be deposition in ice and sediment archives is affected by local environmental conditions. On a slightly longer timescale, however, diverse 10Be records exhibit similar trends and a negative correlation with solar activity. Cyclic variability of 10Be deposition persisted throughout past grand solar minima, when little or no sunspot activity was recorded. 10Be levels ...
format Doctoral or Postdoctoral Thesis
author Berggren, Ann-Marie
author_facet Berggren, Ann-Marie
author_sort Berggren, Ann-Marie
title Influence of solar activity and environment on 10Be in recent natural archives
title_short Influence of solar activity and environment on 10Be in recent natural archives
title_full Influence of solar activity and environment on 10Be in recent natural archives
title_fullStr Influence of solar activity and environment on 10Be in recent natural archives
title_full_unstemmed Influence of solar activity and environment on 10Be in recent natural archives
title_sort influence of solar activity and environment on 10be in recent natural archives
publisher Uppsala universitet, Luft-, vatten- och landskapslära
publishDate 2009
url http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-103031
geographic Greenland
geographic_facet Greenland
genre Greenland
Greenland ice core
ice core
genre_facet Greenland
Greenland ice core
ice core
op_relation Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214
654
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-103031
urn:isbn:978-91-554-7549-9
op_rights info:eu-repo/semantics/openAccess
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