Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history
Instrumental meteorological observation are too short for trying to estimate climate change and variability on multi-decadal and centennial time-scales, and when trying to evaluate the response of the climate system to human influence, such as raised concentrations of green house gases (GHG), altere...
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ftunivgoeteborg:oai:gupea.ub.gu.se:2077/35634 2023-10-29T02:36:15+01:00 Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history Jesper, Björklund 2014-05-15 application/pdf http://hdl.handle.net/2077/35634 eng eng A 153 Björklund J A, Gunnarson B E, Krusic P J, Grudd H, Josefsson T, Östlund L and Linderholm H W (2013) Advances towards improved low-frequency treering reconstructions, using an updated Pinus sylvestris L. MXD network from the Scandinavian Mountains. Theoretical and Applied Climatology, 113: 697- 710. ::doi::10.1007/s00704-012-0787-7 Björklund J A, Gunnarson B E, Seftigen K, Esper J and Linderholm H W (2014) Blue intensity and density from Northern Fennoscandian tree rings, exploring the potential to improve summer temperature reconstructions with earlywood information. Climate of the Past, 10: 877-885. ::doi::10.5194/cp-10-877-2014 Björklund J A, Gunnarson B E, Seftigen K, Zhang P and Linderholm H W The merit of using adjusted Blue Intensity data to attain high-quality summer temperatures information - a case study from Central Scandinavia (Submitted to The Holocene). Linderholm HW, Björklund J A, Seftigen K and Gunnarson B E Fennoscandia revisited – A spatially improved reconstruction of summer temperatures for the last 900 years (Submitted to Climate Dynamics). 978-91-628-9062-9 http://hdl.handle.net/2077/35634 Tree rings Fennoscandia summer temperature maximum latewood density (MXD) blue intensity (BI) standardization Text Doctoral thesis Doctor of Philosophy 2014 ftunivgoeteborg 2023-10-04T21:15:30Z Instrumental meteorological observation are too short for trying to estimate climate change and variability on multi-decadal and centennial time-scales, and when trying to evaluate the response of the climate system to human influence, such as raised concentrations of green house gases (GHG), altered land-use, black carbon etc. To access information about the climate system predating instrumental observations, reliable proxy records (natural archives) are necessary. These proxies include for example tree rings, ice cores, fossil pollen, ocean sediments, corals and historical documentary data. Tree rings is one of the most widely used proxy for high-resolution growing season temperature reconstructions during the last millennium, and in Fennoscandia some of the best-calibrated records in the world exist. Yet, in this available body of work, there is limited homogeneity on decadal to centennial scales. Since this tree-ring data is targeting growing-season temperatures and growing-season temperatures in this region are very well correlated on annual to decadal scales this is unexpected. This thesis is concerned with trying to address this issue by 1) developing existing standardization-tools in order to display centennial scale variability and at the same time reduce noise arising from internal and external disturbances and mismatches in actual growth trends compared to the expected growth trend. 2) By developing the new un-exploited ΔDensity and ΔBlue Intensity proxies (the difference between the latewood and earlywood for density and blue intensity respectively) to act as complement or quality control to the established maximum latewood density (MXD) which is the state of the art proxy for high latitude temperature reconstructions, and also to the Blue Intensity measurement scheme, that potentially could be an inexpensive complement to the radiodensitometric methodology. Results showed that using the Δ parameter for both density and Blue Intensity, give added value in a more focused annual scale summer ... Doctoral or Postdoctoral Thesis Fennoscandia Fennoscandian University of Gothenburg: GUPEA (Gothenburg University Publications Electronic Archive) |
institution |
Open Polar |
collection |
University of Gothenburg: GUPEA (Gothenburg University Publications Electronic Archive) |
op_collection_id |
ftunivgoeteborg |
language |
English |
topic |
Tree rings Fennoscandia summer temperature maximum latewood density (MXD) blue intensity (BI) standardization |
spellingShingle |
Tree rings Fennoscandia summer temperature maximum latewood density (MXD) blue intensity (BI) standardization Jesper, Björklund Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
topic_facet |
Tree rings Fennoscandia summer temperature maximum latewood density (MXD) blue intensity (BI) standardization |
description |
Instrumental meteorological observation are too short for trying to estimate climate change and variability on multi-decadal and centennial time-scales, and when trying to evaluate the response of the climate system to human influence, such as raised concentrations of green house gases (GHG), altered land-use, black carbon etc. To access information about the climate system predating instrumental observations, reliable proxy records (natural archives) are necessary. These proxies include for example tree rings, ice cores, fossil pollen, ocean sediments, corals and historical documentary data. Tree rings is one of the most widely used proxy for high-resolution growing season temperature reconstructions during the last millennium, and in Fennoscandia some of the best-calibrated records in the world exist. Yet, in this available body of work, there is limited homogeneity on decadal to centennial scales. Since this tree-ring data is targeting growing-season temperatures and growing-season temperatures in this region are very well correlated on annual to decadal scales this is unexpected. This thesis is concerned with trying to address this issue by 1) developing existing standardization-tools in order to display centennial scale variability and at the same time reduce noise arising from internal and external disturbances and mismatches in actual growth trends compared to the expected growth trend. 2) By developing the new un-exploited ΔDensity and ΔBlue Intensity proxies (the difference between the latewood and earlywood for density and blue intensity respectively) to act as complement or quality control to the established maximum latewood density (MXD) which is the state of the art proxy for high latitude temperature reconstructions, and also to the Blue Intensity measurement scheme, that potentially could be an inexpensive complement to the radiodensitometric methodology. Results showed that using the Δ parameter for both density and Blue Intensity, give added value in a more focused annual scale summer ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Jesper, Björklund |
author_facet |
Jesper, Björklund |
author_sort |
Jesper, Björklund |
title |
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
title_short |
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
title_full |
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
title_fullStr |
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
title_full_unstemmed |
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history |
title_sort |
tree-rings and climate - standardization, proxy-development, and fennoscandian summer temperature history |
publishDate |
2014 |
url |
http://hdl.handle.net/2077/35634 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_relation |
A 153 Björklund J A, Gunnarson B E, Krusic P J, Grudd H, Josefsson T, Östlund L and Linderholm H W (2013) Advances towards improved low-frequency treering reconstructions, using an updated Pinus sylvestris L. MXD network from the Scandinavian Mountains. Theoretical and Applied Climatology, 113: 697- 710. ::doi::10.1007/s00704-012-0787-7 Björklund J A, Gunnarson B E, Seftigen K, Esper J and Linderholm H W (2014) Blue intensity and density from Northern Fennoscandian tree rings, exploring the potential to improve summer temperature reconstructions with earlywood information. Climate of the Past, 10: 877-885. ::doi::10.5194/cp-10-877-2014 Björklund J A, Gunnarson B E, Seftigen K, Zhang P and Linderholm H W The merit of using adjusted Blue Intensity data to attain high-quality summer temperatures information - a case study from Central Scandinavia (Submitted to The Holocene). Linderholm HW, Björklund J A, Seftigen K and Gunnarson B E Fennoscandia revisited – A spatially improved reconstruction of summer temperatures for the last 900 years (Submitted to Climate Dynamics). 978-91-628-9062-9 http://hdl.handle.net/2077/35634 |
_version_ |
1781059965964779520 |