Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada
High-latitude delta(exp 18)O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation sea...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20150002123 2023-05-15T17:09:29+02:00 Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada Kokelj, Steven V. Healy, Richard Field, Robert D. Edwards, Thomas W. D. LeGrande, Allegra N. Porter, Trevor J. Pisaric, Michael F. J. deMontigny, Peter Unclassified, Unlimited, Publicly available January 30, 2013 application/pdf http://hdl.handle.net/2060/20150002123 unknown Document ID: 20150002123 http://hdl.handle.net/2060/20150002123 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC-E-DAA-TN18988 Climate Dynamics; 42; 4-Mar; 771-785 2013 ftnasantrs 2019-07-21T00:18:08Z High-latitude delta(exp 18)O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation seasonality, both of which can be affected by atmospheric circulation changes. A tree-ring delta(exp 18)O record (AD 1780-2003) from the Mackenzie Delta is evaluated as a temperature proxy based on linear regression diagnostics. The primary source of moisture for this region is the North Pacific and, thus, North Pacific atmospheric circulation variability could potentially affect the tree-ring delta(exp 18)O-temperature signal. Over the instrumental period (AD 1892-2003), tree-ring delta(exp 18)O explained 29% of interannual variability in April-July minimum temperatures, and the explained variability increases substantially at lower-frequencies. A split-period calibration/verification analysis found the delta(exp 18)O-temperature relation was time-stable, which supported a temperature reconstruction back to AD 1780. The stability of the delta(exp 18)O-temperature signal indirectly implies the study region is insensitive to North Pacific circulation effects, since North Pacific circulation was not constant over the calibration period. Simulations from the NASA-GISS ModelE isotope-enabled general circulation model confirm that meteoric delta(exp 18)O and precipitation seasonality in the study region are likely insensitive to North Pacific circulation effects, highlighting the paleoclimatic value of tree-ring and possibly other delta(exp 18)O records from this region. Our delta(exp 18)O-based temperature reconstruction is the first of its kind in northwestern North America, and one of few worldwide, and provides a long-term context for evaluating recent climate warming in the Mackenzie Delta region. Other/Unknown Material Mackenzie Delta NASA Technical Reports Server (NTRS) Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Pacific |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Kokelj, Steven V. Healy, Richard Field, Robert D. Edwards, Thomas W. D. LeGrande, Allegra N. Porter, Trevor J. Pisaric, Michael F. J. deMontigny, Peter Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
topic_facet |
Meteorology and Climatology |
description |
High-latitude delta(exp 18)O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation seasonality, both of which can be affected by atmospheric circulation changes. A tree-ring delta(exp 18)O record (AD 1780-2003) from the Mackenzie Delta is evaluated as a temperature proxy based on linear regression diagnostics. The primary source of moisture for this region is the North Pacific and, thus, North Pacific atmospheric circulation variability could potentially affect the tree-ring delta(exp 18)O-temperature signal. Over the instrumental period (AD 1892-2003), tree-ring delta(exp 18)O explained 29% of interannual variability in April-July minimum temperatures, and the explained variability increases substantially at lower-frequencies. A split-period calibration/verification analysis found the delta(exp 18)O-temperature relation was time-stable, which supported a temperature reconstruction back to AD 1780. The stability of the delta(exp 18)O-temperature signal indirectly implies the study region is insensitive to North Pacific circulation effects, since North Pacific circulation was not constant over the calibration period. Simulations from the NASA-GISS ModelE isotope-enabled general circulation model confirm that meteoric delta(exp 18)O and precipitation seasonality in the study region are likely insensitive to North Pacific circulation effects, highlighting the paleoclimatic value of tree-ring and possibly other delta(exp 18)O records from this region. Our delta(exp 18)O-based temperature reconstruction is the first of its kind in northwestern North America, and one of few worldwide, and provides a long-term context for evaluating recent climate warming in the Mackenzie Delta region. |
format |
Other/Unknown Material |
author |
Kokelj, Steven V. Healy, Richard Field, Robert D. Edwards, Thomas W. D. LeGrande, Allegra N. Porter, Trevor J. Pisaric, Michael F. J. deMontigny, Peter |
author_facet |
Kokelj, Steven V. Healy, Richard Field, Robert D. Edwards, Thomas W. D. LeGrande, Allegra N. Porter, Trevor J. Pisaric, Michael F. J. deMontigny, Peter |
author_sort |
Kokelj, Steven V. |
title |
Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
title_short |
Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
title_full |
Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
title_fullStr |
Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
title_full_unstemmed |
Spring-Summer Temperatures Since AD 1780 Reconstructed from Stable Oxygen Isotope Ratios in White Spruce Tree-Rings from the Mackenzie Delta, Northwestern Canada |
title_sort |
spring-summer temperatures since ad 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the mackenzie delta, northwestern canada |
publishDate |
2013 |
url |
http://hdl.handle.net/2060/20150002123 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Canada Mackenzie Delta Pacific |
geographic_facet |
Canada Mackenzie Delta Pacific |
genre |
Mackenzie Delta |
genre_facet |
Mackenzie Delta |
op_source |
CASI |
op_relation |
Document ID: 20150002123 http://hdl.handle.net/2060/20150002123 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766065600443973632 |