Variability and extremes of northern Scandinavian summer temperatures over the past two millennia
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| Title: | Variability and extremes of northern Scandinavian summer temperatures over the past two millennia |
|---|---|
| Authors: | Esper, Jan1 esper@uni-mainz.de, Büntgen, Ulf2, Timonen, Mauri3, Frank, David C.2,4 |
| Source: | Global & Planetary Change. May2012, Vol. 88-89, p1-9. 9p. |
| Subject Terms: | *Seasonal temperature variations, *Paleoclimatology, *Climate change research, Summer, Numerical analysis, Scots pine |
| Geographic Terms: | Scandinavia, Northern Hemisphere |
| Abstract: | Abstract: Palaeoclimatic evidence revealed synchronous temperature variations among Northern Hemisphere regions over the past millennium. The range of these variations (in degrees Celsius) is, however, largely unknown. We here present a 2000-year summer temperature reconstruction from northern Scandinavia and compare this timeseries with existing proxy records to assess the range of reconstructed temperatures at a regional scale. The new reconstruction is based on 578 maximum latewood density profiles from living and sub-fossil Pinus sylvestris samples from northern Sweden and Finland. The record provides evidence for substantial warmth during Roman and Medieval times, larger in extent and longer in duration than 20th century warmth. The first century AD was the warmest 100-year period (+0.60°C on average relative to the 1951–1980 mean) of the Common Era, more than 1°C warmer than the coldest 14th century AD (−0.51°C). The warmest and coldest reconstructed 30-year periods (AD 21–50=+1.05°C, and AD 1451–80=−1.19°C) differ by more than 2°C, and the range between the five warmest and coldest reconstructed summers in the context of the past 2000years is estimated to exceed 5°C. Comparison of the new timeseries with five existing tree-ring based reconstructions from northern Scandinavia revealed synchronized climate fluctuations but substantially different absolute temperatures. Level offset among the various reconstructions in extremely cold and warm years (up to 3°C) and cold and warm 30-year periods (up to 1.5°C) are in the order of the total temperature variance of each individual reconstruction over the past 1500 to 2000years. These findings demonstrate our poor understanding of the absolute temperature variance in a region where high-resolution proxy coverage is denser than in any other area of the world. [Copyright &y& Elsevier] |
| Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
| FullText | Text: Availability: 0 |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 75450801 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Variability and extremes of northern Scandinavian summer temperatures over the past two millennia – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Esper%2C+Jan%22">Esper, Jan</searchLink><relatesTo>1</relatesTo><i> esper@uni-mainz.de</i><br /><searchLink fieldCode="AR" term="%22Büntgen%2C+Ulf%22">Büntgen, Ulf</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Timonen%2C+Mauri%22">Timonen, Mauri</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Frank%2C+David+C%2E%22">Frank, David C.</searchLink><relatesTo>2,4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Global+%26+Planetary+Change%22">Global & Planetary Change</searchLink>. May2012, Vol. 88-89, p1-9. 9p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Seasonal+temperature+variations%22">Seasonal temperature variations</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleoclimatology%22">Paleoclimatology</searchLink><br />*<searchLink fieldCode="DE" term="%22Climate+change+research%22">Climate change research</searchLink><br /><searchLink fieldCode="DE" term="%22Summer%22">Summer</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Scots+pine%22">Scots pine</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Scandinavia%22">Scandinavia</searchLink><br /><searchLink fieldCode="DE" term="%22Northern+Hemisphere%22">Northern Hemisphere</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Palaeoclimatic evidence revealed synchronous temperature variations among Northern Hemisphere regions over the past millennium. The range of these variations (in degrees Celsius) is, however, largely unknown. We here present a 2000-year summer temperature reconstruction from northern Scandinavia and compare this timeseries with existing proxy records to assess the range of reconstructed temperatures at a regional scale. The new reconstruction is based on 578 maximum latewood density profiles from living and sub-fossil Pinus sylvestris samples from northern Sweden and Finland. The record provides evidence for substantial warmth during Roman and Medieval times, larger in extent and longer in duration than 20th century warmth. The first century AD was the warmest 100-year period (+0.60°C on average relative to the 1951–1980 mean) of the Common Era, more than 1°C warmer than the coldest 14th century AD (−0.51°C). The warmest and coldest reconstructed 30-year periods (AD 21–50=+1.05°C, and AD 1451–80=−1.19°C) differ by more than 2°C, and the range between the five warmest and coldest reconstructed summers in the context of the past 2000years is estimated to exceed 5°C. Comparison of the new timeseries with five existing tree-ring based reconstructions from northern Scandinavia revealed synchronized climate fluctuations but substantially different absolute temperatures. Level offset among the various reconstructions in extremely cold and warm years (up to 3°C) and cold and warm 30-year periods (up to 1.5°C) are in the order of the total temperature variance of each individual reconstruction over the past 1500 to 2000years. These findings demonstrate our poor understanding of the absolute temperature variance in a region where high-resolution proxy coverage is denser than in any other area of the world. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.gloplacha.2012.01.006 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1 Subjects: – SubjectFull: Seasonal temperature variations Type: general – SubjectFull: Paleoclimatology Type: general – SubjectFull: Climate change research Type: general – SubjectFull: Summer Type: general – SubjectFull: Numerical analysis Type: general – SubjectFull: Scots pine Type: general – SubjectFull: Scandinavia Type: general – SubjectFull: Northern Hemisphere Type: general Titles: – TitleFull: Variability and extremes of northern Scandinavian summer temperatures over the past two millennia Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Esper, Jan – PersonEntity: Name: NameFull: Büntgen, Ulf – PersonEntity: Name: NameFull: Timonen, Mauri – PersonEntity: Name: NameFull: Frank, David C. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 09218181 Numbering: – Type: volume Value: 88-89 Titles: – TitleFull: Global & Planetary Change Type: main |
| ResultId | 1 |
