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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Bibliographic Details
Main Authors: Gkinis, Vasileios, Simonsen, Sebastian B, Buchardt, Susanne L, White, James W C, Vinther, Bo Møllesøe
Format: Dataset
Language:English
Published: PANGAEA 2018
Subjects:
DEPTH, ice/snow
δ18O, water
Ice drill
NGRIP
Sampling/drilling ice
Greenland Ice Core Projects GRIP/GISP/NGRIP
North Greenland Ice Core Project NGRIP
GISP
Greenland
Greenland ice core
Greenland Ice core Project
GRIP
ice core
North Greenland
North Greenland Ice Core Project
Online Access:https://dx.doi.org/10.1594/pangaea.886044
https://doi.pangaea.de/10.1594/PANGAEA.886044
Description
Summary: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 ... : The overlapping NGRIP I and II core sampled with a 5 cm resolution an measured on an IRMS. Even though the depth is identical, it is not expected that the age is completely identical. ...

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