Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions
Combined records of snow accumulation rate, δ 18 O and deuterium excess were produced from several shallow ice cores and snow pits at NEEM (North Greenland Eemian Ice Drilling), covering the period from 1724 to 2007. They are used to investigate recent climate variability and characterise the isotop...
Published in: | The Cryosphere |
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/tc-9-1481-2015 https://doaj.org/article/fcf94dbac04e46779b9cbd20b2263dc6 |
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ftdoajarticles:oai:doaj.org/article:fcf94dbac04e46779b9cbd20b2263dc6 2023-05-15T16:28:45+02:00 Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions V. Masson-Delmotte H. C. Steen-Larsen P. Ortega D. Swingedouw T. Popp B. M. Vinther H. Oerter A. E. Sveinbjornsdottir H. Gudlaugsdottir J. E. Box S. Falourd X. Fettweis H. Gallée E. Garnier V. Gkinis J. Jouzel A. Landais B. Minster N. Paradis A. Orsi C. Risi M. Werner J. W. C. White 2015-08-01T00:00:00Z https://doi.org/10.5194/tc-9-1481-2015 https://doaj.org/article/fcf94dbac04e46779b9cbd20b2263dc6 EN eng Copernicus Publications http://www.the-cryosphere.net/9/1481/2015/tc-9-1481-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-1481-2015 https://doaj.org/article/fcf94dbac04e46779b9cbd20b2263dc6 The Cryosphere, Vol 9, Iss 4, Pp 1481-1504 (2015) Environmental sciences GE1-350 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/tc-9-1481-2015 2022-12-31T02:01:53Z Combined records of snow accumulation rate, δ 18 O and deuterium excess were produced from several shallow ice cores and snow pits at NEEM (North Greenland Eemian Ice Drilling), covering the period from 1724 to 2007. They are used to investigate recent climate variability and characterise the isotope–temperature relationship. We find that NEEM records are only weakly affected by inter-annual changes in the North Atlantic Oscillation. Decadal δ 18 O and accumulation variability is related to North Atlantic sea surface temperature and is enhanced at the beginning of the 19th century. No long-term trend is observed in the accumulation record. By contrast, NEEM δ 18 O shows multidecadal increasing trends in the late 19th century and since the 1980s. The strongest annual positive δ 18 O values are recorded at NEEM in 1928 and 2010, while maximum accumulation occurs in 1933. The last decade is the most enriched in δ 18 O (warmest), while the 11-year periods with the strongest depletion (coldest) are depicted at NEEM in 1815–1825 and 1836–1846, which are also the driest 11-year periods. The NEEM accumulation and δ 18 O records are strongly correlated with outputs from atmospheric models, nudged to atmospheric reanalyses. Best performance is observed for ERA reanalyses. Gridded temperature reconstructions, instrumental data and model outputs at NEEM are used to estimate the multidecadal accumulation–temperature and δ 18 O–temperature relationships for the strong warming period in 1979–2007. The accumulation sensitivity to temperature is estimated at 11 ± 2 % °C −1 and the δ 18 O–temperature slope at 1.1 ± 0.2 ‰ °C −1 , about twice as large as previously used to estimate last interglacial temperature change from the bottom part of the NEEM deep ice core. Article in Journal/Newspaper Greenland ice core North Atlantic North Atlantic oscillation North Greenland The Cryosphere Directory of Open Access Journals: DOAJ Articles Greenland The Cryosphere 9 4 1481 1504 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 V. Masson-Delmotte H. C. Steen-Larsen P. Ortega D. Swingedouw T. Popp B. M. Vinther H. Oerter A. E. Sveinbjornsdottir H. Gudlaugsdottir J. E. Box S. Falourd X. Fettweis H. Gallée E. Garnier V. Gkinis J. Jouzel A. Landais B. Minster N. Paradis A. Orsi C. Risi M. Werner J. W. C. White Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Combined records of snow accumulation rate, δ 18 O and deuterium excess were produced from several shallow ice cores and snow pits at NEEM (North Greenland Eemian Ice Drilling), covering the period from 1724 to 2007. They are used to investigate recent climate variability and characterise the isotope–temperature relationship. We find that NEEM records are only weakly affected by inter-annual changes in the North Atlantic Oscillation. Decadal δ 18 O and accumulation variability is related to North Atlantic sea surface temperature and is enhanced at the beginning of the 19th century. No long-term trend is observed in the accumulation record. By contrast, NEEM δ 18 O shows multidecadal increasing trends in the late 19th century and since the 1980s. The strongest annual positive δ 18 O values are recorded at NEEM in 1928 and 2010, while maximum accumulation occurs in 1933. The last decade is the most enriched in δ 18 O (warmest), while the 11-year periods with the strongest depletion (coldest) are depicted at NEEM in 1815–1825 and 1836–1846, which are also the driest 11-year periods. The NEEM accumulation and δ 18 O records are strongly correlated with outputs from atmospheric models, nudged to atmospheric reanalyses. Best performance is observed for ERA reanalyses. Gridded temperature reconstructions, instrumental data and model outputs at NEEM are used to estimate the multidecadal accumulation–temperature and δ 18 O–temperature relationships for the strong warming period in 1979–2007. The accumulation sensitivity to temperature is estimated at 11 ± 2 % °C −1 and the δ 18 O–temperature slope at 1.1 ± 0.2 ‰ °C −1 , about twice as large as previously used to estimate last interglacial temperature change from the bottom part of the NEEM deep ice core. |
format |
Article in Journal/Newspaper |
author |
V. Masson-Delmotte H. C. Steen-Larsen P. Ortega D. Swingedouw T. Popp B. M. Vinther H. Oerter A. E. Sveinbjornsdottir H. Gudlaugsdottir J. E. Box S. Falourd X. Fettweis H. Gallée E. Garnier V. Gkinis J. Jouzel A. Landais B. Minster N. Paradis A. Orsi C. Risi M. Werner J. W. C. White |
author_facet |
V. Masson-Delmotte H. C. Steen-Larsen P. Ortega D. Swingedouw T. Popp B. M. Vinther H. Oerter A. E. Sveinbjornsdottir H. Gudlaugsdottir J. E. Box S. Falourd X. Fettweis H. Gallée E. Garnier V. Gkinis J. Jouzel A. Landais B. Minster N. Paradis A. Orsi C. Risi M. Werner J. W. C. White |
author_sort |
V. Masson-Delmotte |
title |
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
title_short |
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
title_full |
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
title_fullStr |
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
title_full_unstemmed |
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions |
title_sort |
recent changes in north-west greenland climate documented by neem shallow ice core data and simulations, and implications for past-temperature reconstructions |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-1481-2015 https://doaj.org/article/fcf94dbac04e46779b9cbd20b2263dc6 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core North Atlantic North Atlantic oscillation North Greenland The Cryosphere |
genre_facet |
Greenland ice core North Atlantic North Atlantic oscillation North Greenland The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 4, Pp 1481-1504 (2015) |
op_relation |
http://www.the-cryosphere.net/9/1481/2015/tc-9-1481-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-1481-2015 https://doaj.org/article/fcf94dbac04e46779b9cbd20b2263dc6 |
op_doi |
https://doi.org/10.5194/tc-9-1481-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
4 |
container_start_page |
1481 |
op_container_end_page |
1504 |
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1766018430959353856 |