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The Cryosphere An interactive open-access journal of the European Geosciences Union
doi:10.5194/tc-2016-244
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Nov 2016
Review status
A revision of this discussion paper was accepted for the journal The Cryosphere (TC) and is expected to appear here in due course.
Calibrated cryo-cell UV-LA-ICPMS elemental concentrations from NGRIP ice core reveal abrupt, sub-annual variability in dust across the interstadial period GI-21.2
Damiano Della Lunga1, Wolfgang Müller1, Sune Olander Rasmussen2, Anders Svensson2, and Paul Vallelonga2 1Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, United Kingdom
2Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark
Abstract. Several abrupt shifts from periods of extreme cold (Greenland stadials, GS) to relatively warmer conditions (Greenland interstadials, GI) called Dansgaard-Oeschger events are recorded in the Greenland ice cores. Using cryo-cell UV-laser-ablation inductively-coupled-plasma mass spectrometry (UV-LA-ICPMS), we analysed a 2.85 m NGRIP ice core section (~ 250 years; 2691.50–2688.65 m depth) across the transitions of GI-21.2, a short-lived interstadial prior to interstadial GI-21.1 (GI-21.2: 84.87–85.09 ka b2k). GI-21.2 is a ~ 100-year-long period with δ18O values 3–4 ‰ higher than the following ~ 200 years of stadial conditions (GS-21.2), which precede the major GI-21.1 warming. We report concentrations of "major" elements indicative of dust and/or sea salt (Na, Fe, Al, Ca, Mg) at a spatial resolution of ~ 200 μm, while maintaining detection limits in the low-ppb range, thereby achieving sub-annual time resolution even in deep NGRIP ice. We present an improved external calibration and quantification procedure using a set of five ice standards made from aqueous (international) standard solutions. Our results show that element concentrations decrease drastically (more than tenfold) at the warming onset of GI-21.2 at the scale of a single year, followed by relatively low concentrations characterizing the interstadial part before gradually reaching again typical stadial values.

Citation: Della Lunga, D., Müller, W., Rasmussen, S. O., Svensson, A., and Vallelonga, P.: Calibrated cryo-cell UV-LA-ICPMS elemental concentrations from NGRIP ice core reveal abrupt, sub-annual variability in dust across the interstadial period GI-21.2, The Cryosphere Discuss., doi:10.5194/tc-2016-244, in review, 2016.
Damiano Della Lunga et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Review of Della Lunga et al', Anonymous Referee #1, 20 Dec 2016 Printer-friendly Version Supplement 
AC1: 'Authors reply to R1', Damiano Della Lunga, 02 Mar 2017 Printer-friendly Version Supplement 
 
RC2: 'LA-ICP-MS', Anonymous Referee #2, 05 Feb 2017 Printer-friendly Version 
AC2: 'Authors reply to R2', Damiano Della Lunga, 02 Mar 2017 Printer-friendly Version Supplement 
Damiano Della Lunga et al.
Damiano Della Lunga et al.

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Short summary
In our study we combined the wealth of information provided by Greenland ice cores with an ultra-high resolution technique well-known in geoscience (laser ablation). Our setup was developed and applied to investigate the variability in concentrations of ions across a rapid climatic change from the oldest part of the last glaciation, showing that concentrations drop abruptly from cold to warm periods, representing a shift in atmospheric transport that happens even faster than previously thought.
In our study we combined the wealth of information provided by Greenland ice cores with an...
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