Water stable isotope record of ice cores NGRIP I and II
A high resolution (0.05 m) water isotopic record (d18O) is available from the NorthGRIP ice core. In this study we look into the water isotope diffusion history as estimated by the spectral characteristics of the d18O time series covering the last 16,000 years. The diffusion of water vapor in the po...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.886044 2024-09-15T18:07:29+00:00 Water stable isotope record of ice cores NGRIP I and II Gkinis, Vasileios Simonsen, Sebastian B Buchardt, Susanne L White, James W C Vinther, Bo Møllesøe LATITUDE: 75.100000 * LONGITUDE: -42.320000 * DATE/TIME START: 1996-07-01T00:00:00 * DATE/TIME END: 1996-07-01T00:00:00 * MINIMUM DEPTH, ice/snow: 1300.00 m * MAXIMUM DEPTH, ice/snow: 1319.95 m 2018 text/tab-separated-values, 800 data points https://doi.pangaea.de/10.1594/PANGAEA.886044 https://doi.org/10.1594/PANGAEA.886044 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.886044 https://doi.org/10.1594/PANGAEA.886044 CC-BY-NC-ND-3.0: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Gkinis, Vasileios; Simonsen, Sebastian B; Buchardt, Susanne L; White, James W C; Vinther, Bo Møllesøe (2014): Water isotope diffusion rates from the NorthGRIP ice core for the last 16,000 years – Glaciological and paleoclimatic implications. Earth and Planetary Science Letters, 405, 132-141, https://doi.org/10.1016/j.epsl.2014.08.022 DEPTH ice/snow Greenland Greenland Ice Core Projects GRIP/GISP/NGRIP ICEDRILL Ice drill NGRIP North Greenland Ice Core Project NorthGRIP Sampling/drilling ice δ18O water dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.88604410.1016/j.epsl.2014.08.022 2024-07-24T02:31:33Z A high resolution (0.05 m) water isotopic record (d18O) is available from the NorthGRIP ice core. In this study we look into the water isotope diffusion history as estimated by the spectral characteristics of the d18O time series covering the last 16,000 years. The diffusion of water vapor in the porous medium of the firn pack attenuates the initial isotopic signal, predominantly having an impact on the high frequency components of the power spectrum. Higher temperatures induce higher rates of smoothing and thus the signal can be used as a firn paleothermometer. We use a water isotope diffusion model coupled to a steady-state densification model in order to infer the temperature signal from the site, assuming the accumulation and strain rate history as estimated using the GICC05 layer counted chronology and a Dansgaard-Johnsen ice flow model. The temperature reconstruction accurately captures the timing and magnitude of the Bølling-Allerød and Younger Dryas transitions. A Holocene climatic optimum is seen between 7 and 9 ky b2k with an apparent cooling trend thereafter. Our temperature estimate for the Holocene climatic optimum, points to a necessary adjustment of the ice thinning function indicating that the ice flow model overestimates past accumulation rates by about 10% at 8 ky b2k. This result, is supported by recent gas isotopic fractionation studies proposing a similar reduction for glacial conditions. Finally, the record presents a climatic variability over the Holocene spanning millennial and centennial scales with a profound cooling occurring at approximately 4000 years b2k. The new reconstruction technique is able to provide past temperature estimates by overcoming the issues apparent in the use of the classical d18O slope method. It can at the same time resolve temperature signals at low and high frequencies. Dataset GISP Greenland Greenland ice core Greenland Ice core Project GRIP ice core NGRIP North Greenland North Greenland Ice Core Project PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-42.320000,-42.320000,75.100000,75.100000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
DEPTH ice/snow Greenland Greenland Ice Core Projects GRIP/GISP/NGRIP ICEDRILL Ice drill NGRIP North Greenland Ice Core Project NorthGRIP Sampling/drilling ice δ18O water |
spellingShingle |
DEPTH ice/snow Greenland Greenland Ice Core Projects GRIP/GISP/NGRIP ICEDRILL Ice drill NGRIP North Greenland Ice Core Project NorthGRIP Sampling/drilling ice δ18O water Gkinis, Vasileios Simonsen, Sebastian B Buchardt, Susanne L White, James W C Vinther, Bo Møllesøe Water stable isotope record of ice cores NGRIP I and II |
topic_facet |
DEPTH ice/snow Greenland Greenland Ice Core Projects GRIP/GISP/NGRIP ICEDRILL Ice drill NGRIP North Greenland Ice Core Project NorthGRIP Sampling/drilling ice δ18O water |
description |
A high resolution (0.05 m) water isotopic record (d18O) is available from the NorthGRIP ice core. In this study we look into the water isotope diffusion history as estimated by the spectral characteristics of the d18O time series covering the last 16,000 years. The diffusion of water vapor in the porous medium of the firn pack attenuates the initial isotopic signal, predominantly having an impact on the high frequency components of the power spectrum. Higher temperatures induce higher rates of smoothing and thus the signal can be used as a firn paleothermometer. We use a water isotope diffusion model coupled to a steady-state densification model in order to infer the temperature signal from the site, assuming the accumulation and strain rate history as estimated using the GICC05 layer counted chronology and a Dansgaard-Johnsen ice flow model. The temperature reconstruction accurately captures the timing and magnitude of the Bølling-Allerød and Younger Dryas transitions. A Holocene climatic optimum is seen between 7 and 9 ky b2k with an apparent cooling trend thereafter. Our temperature estimate for the Holocene climatic optimum, points to a necessary adjustment of the ice thinning function indicating that the ice flow model overestimates past accumulation rates by about 10% at 8 ky b2k. This result, is supported by recent gas isotopic fractionation studies proposing a similar reduction for glacial conditions. Finally, the record presents a climatic variability over the Holocene spanning millennial and centennial scales with a profound cooling occurring at approximately 4000 years b2k. The new reconstruction technique is able to provide past temperature estimates by overcoming the issues apparent in the use of the classical d18O slope method. It can at the same time resolve temperature signals at low and high frequencies. |
format |
Dataset |
author |
Gkinis, Vasileios Simonsen, Sebastian B Buchardt, Susanne L White, James W C Vinther, Bo Møllesøe |
author_facet |
Gkinis, Vasileios Simonsen, Sebastian B Buchardt, Susanne L White, James W C Vinther, Bo Møllesøe |
author_sort |
Gkinis, Vasileios |
title |
Water stable isotope record of ice cores NGRIP I and II |
title_short |
Water stable isotope record of ice cores NGRIP I and II |
title_full |
Water stable isotope record of ice cores NGRIP I and II |
title_fullStr |
Water stable isotope record of ice cores NGRIP I and II |
title_full_unstemmed |
Water stable isotope record of ice cores NGRIP I and II |
title_sort |
water stable isotope record of ice cores ngrip i and ii |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.886044 https://doi.org/10.1594/PANGAEA.886044 |
op_coverage |
LATITUDE: 75.100000 * LONGITUDE: -42.320000 * DATE/TIME START: 1996-07-01T00:00:00 * DATE/TIME END: 1996-07-01T00:00:00 * MINIMUM DEPTH, ice/snow: 1300.00 m * MAXIMUM DEPTH, ice/snow: 1319.95 m |
long_lat |
ENVELOPE(-42.320000,-42.320000,75.100000,75.100000) |
genre |
GISP Greenland Greenland ice core Greenland Ice core Project GRIP ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
GISP Greenland Greenland ice core Greenland Ice core Project GRIP ice core NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Supplement to: Gkinis, Vasileios; Simonsen, Sebastian B; Buchardt, Susanne L; White, James W C; Vinther, Bo Møllesøe (2014): Water isotope diffusion rates from the NorthGRIP ice core for the last 16,000 years – Glaciological and paleoclimatic implications. Earth and Planetary Science Letters, 405, 132-141, https://doi.org/10.1016/j.epsl.2014.08.022 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.886044 https://doi.org/10.1594/PANGAEA.886044 |
op_rights |
CC-BY-NC-ND-3.0: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.88604410.1016/j.epsl.2014.08.022 |
_version_ |
1810444875613601792 |