A diatom-conductivity transfer function for reconstructing past changes in the Southern Hemisphere westerly winds over the Southern Ocean

作者：Saunders Krystyna M^*; Hodgson Dominic A; Mcmurtrie Shelley; Grosjean Martin

来源：Journal of Quaternary Science, 2015, 30(5): 464-477.

DOI：10.1002/jqs.2788

• Campbell Island
• diatom transfer function
• Southern Hemisphere
• sub-Antarctic
• westerly winds

Sub-Antarctic islands are ideally placed to reconstruct past changes in Southern Hemisphere westerly wind behaviour. They lie within their core belt (50-60 degrees S) and the strong winds deliver sea salt ions to the islands resulting in a west to east conductivity gradient in their water bodies. This means that the stronger (or weaker) the winds, the higher (or lower) the conductivity values measured in the water bodies. A survey of the water chemistry and diatom assemblages of lakes and ponds on sub-Antarctic Campbell Island (52 degrees 32'S, 169 degrees 8'E) revealed that, similar to other sub-Antarctic islands, conductivity was the most important, statistically significant ecological variable explaining turnover in diatom community structure. Based on this, a diatom-conductivity transfer function was developed (simple weighted averaging with inverse deshrinking: R-2=0.86, R-jack(2)=0.66, RMSEP=0.25 log(10) mu S cm(-1)). This transfer function will be applied to lake sediment cores from the western edge of the Campbell Island plateau to reconstruct past conductivity/sea spray and therefore directly reconstruct changes in Southern Hemisphere westerly wind strength within their core belt.

• 出版日期2015-7