Calibrated cryo-cell UV-LA-ICPMS elemental concentrations from the NGRIP ice core reveal abrupt, sub-annual variability in dust across the GI-21.2 interstadial period
| Autor: | Damiano Della Lunga, Paul Vallelonga, Wolfgang Müller, Sune Olander Rasmussen, Anders Svensson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
lcsh:GE1-350
food.ingredient 010504 meteorology & atmospheric sciences δ18O Sea salt 010401 analytical chemistry lcsh:QE1-996.5 Time resolution Atmospheric sciences 01 natural sciences 0104 chemical sciences lcsh:Geology food Ice core 13. Climate action Climatology Long period Period (geology) Environmental science Stadial Volume concentration lcsh:Environmental sciences 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology |
| Zdroj: | The Cryosphere, Vol 11, Pp 1297-1309 (2017) Della Lunga, D, Mueller, W, Rasmussen, S O, Svensson, A & Vallelonga, P 2017, ' Calibrated cryo-cell UV-LA-ICPMS elemental concentrations from the NGRIP ice core reveal abrupt, sub-annual variability in dust across the GI-21.2 interstadial period ', Cryosphere, vol. 11, no. 3, pp. 1297-1309 . https://doi.org/10.5194/tc-11-1297-2017 |
| ISSN: | 1994-0424 1994-0416 |
| DOI: | 10.5194/tc-11-1297-2017 |
| Popis: | 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 (2691.50–2688.65 m depth, age interval 84.86–85.09 ka b2k, thus covering ∼ 230 years) across the transitions of GI-21.2, a short-lived interstadial prior to interstadial GI-21.1. 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 10-fold) 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. |
| Databáze: | OpenAIRE |
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