GOLD-ICE
Next generation analysis of the oldest ice core layers

Rationale

Ice cores drilled on polar ice sheets have revealed invaluable insights into our climate system. Due to continuous thinning of layers with depth, there is a demand for novel high-resolution analysis to better decipher highly thinned layers in the deepest part of ice cores.

In the GOLD-ICE project,

  • Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) is refined for glaciochemical ice core analysis;
  • highly thinned deep layers of Antarctic ice cores are investigated for untapped paleoclimatic signals;
  • the role of impurity localization in the ice crystal matrix is taken into account.

Ultimately, this will pave the way for the next generation of LA-ICP-MS ice core analysis.

A polar ice core in the drill.

Project

Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS)

Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) offers micron-scale glacio-chemical ice core analysis to investigate high resolution paleoclimate records.

  • It is a micro-destructive technique, with only a few tenths of µL of ice ablated from the surface by the laser.
  • The sample is transported by an inert carrier gas to the mass spectrometer, where it is analyzed for various elemental impurity species.
  • During analysis the strips of ice core are kept frozen in a specially designed cryogenic sample holder.

LA-ICP-MS is also a powerful technique for imaging the 2D impurity distribution of solid samples, an application which still remains to be fully exploited for ice cores.

Schematic representation of LA-ICP-MS ice core analysis.

LA-ICP-MS for novel 2d impurity imaging on ice cores

Post-depositional processes through the interaction of impurities with the ice matrix can cause microscopic movement of impurities which may ultimately corrupt the original layer sequence. At the fine-scale resolution of LA-ICP-MS it is crucial to take into account the localization of impurities within the ice crystal matrix.

  • GOLD-ICE shows how employing LA-ICP-MS for imaging the impurity distribution in ice cores can be refined and strongly improved.
  • This LA-ICP-MS imaging method for ice cores can map the localization of impurities at high spatial resolution (tens of µm), at high speed and without imaging artifacts.

This promises not only new insights into the impurity distribution in glacier ice but also lays the ground for an improved understanding of the LA-ICP-MS signal obtained from ice cores.

Camera image mosaic: ice surface.
LA-ICP-MS impurity image.

Publications

  • Bohleber, P., Roman, M., Šala, M., Delmonte, B., Stenni, B., and Barbante, C.: Two-dimensional impurity imaging in deep Antarctic ice cores: snapshots of three climatic periods and implications for high-resolution signal interpretation, The Cryosphere, 15, 3523–3538, https://doi.org/10.5194/tc-15-3523-2021, 2021.

  • Bohleber P., Roman, M., Barbante, C., Vascon, S., Siddiqi, K. and Pelillo, M.: Ice Core Science Meets Computer Vision: Challenges and Perspectives, Front. Comput. Sci., 3:690276, https://doi.org/10.3389/fcomp.2021.690276, 2021.      

  • Bohleber, P., Roman, M., Vascon, S., Pelillo, M., and Barbante, C.: Two-dimensional impurity imaging in polar ice cores sparks new demand for automated image analysis, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5105, https://doi.org/10.5194/egusphere-egu21-5105, 2021. 

  • Bohleber, P.: High res = high gain? New frontiers in ice core trace element analysis with laser ablation ICP-MS, ICYS/IPICS seminar series, held online 25 Feb 2021, https://youtu.be/fVgVUurRLbI

  • Bohleber, P., Roman, M., Fiorini, L., Šala, M., Stenni, B., Delmonte, B., & Barbante, C. (2020). Two-dimensional impurity imaging in deep Antarctic ice cores: Snapshots of three climatic periods and implications for high-resolution signal interpretation. In AGU Fall Meeting 2020. AGU. https://agu.confex.com/agu/fm20/meetingapp.cgi/Paper/729089, 2020
  • Bohleber, P., Roman, M., Šala, M., and Barbante, C.: Imaging the impurity distribution in glacier ice cores with LA-ICP-MS. Journal of Analytical Atomic Spectrometry. https://doi.org/10.1039/D0JA00170H, 2020
  • Bohleber, P., Casado, M., Ashworth, K., Baker, C. A., Belcher, A., Caccavo, J. A., Jenkins, H. E., Satterthwaite, E., Spolaor, A., and Winton, V. H. L.: Successful practice in early career networks: insights from the polar sciences, Adv. Geosci., 53, 1–14, https://doi.org/10.5194/adgeo-53-1-2020, 2020
  • Bohleber, P., Roman, M., Barbante, C., Stenni, B., and Delmonte, B.: Towards an improved understanding of high-resolution impurity signals in deep Antarctic ice cores, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8537, https://doi.org/10.5194/egusphere-egu2020-8537, 2020