Siple Dome Glaciochemistry - University of Maine
Mayewski, Meyerson, Sneed, Meeker
We now have complete major ion coverage over the full length of the Siple Dome core and are in the process of filling in detailed sections. Thus far we have demonstrated that:
- SD major ion series have strong seasonal signals in this region.
- SD ion series provide histories of volcanic events, marine storminess, katabatic wind events, etc affecting West Antarctica.
- Seasalt series are strongly correlated with slp fluctuations in the region of the Amundsen Sea Low and surrounding ocean
- Siple Dome experienced a dramatic increase in marine storminess during the period classically termed the Little Ice Age
- The Siple Dome LIA event has an onset time that is coincident with that of the LIA in the North Atlantic based on a correlation with the GISP2 record
- The SD LIA-like event is the most dramatic climate event seen in the SD Holocene glaciochemical record.
- The SD Holocene record contains evidence of many of the Holocene rapid climate change events seen in the GISP2 Holocene record and a gobal assemblage of other Holocene records.
- The SD Holocene trend in ion series is related to insolation at this latitude.
- The SD pre-Holocene ion record has both close parallels with the Taylor Dome pre-Holocene record and notable dissimilarities. The dissimilarities Indicate that the Siple Dome region was not dominated by Amundsen Sea Low Influences during the pre-Holocene as a consequence of significant expansion of sea ice, or local tce surface topogra, or regional ice surface topography, or Continental scale differences in atmospheric circulation.
- Interpretation of the Siple Dome major ion record has been greatly facilitated by US ITASE ice core interpretations.
- The Siple Dome Holocene ion record offers important insights into global climate change when viewed in the context of a global array of Holocene climatic records.