Calcium isotopic composition of high-latitude proxy carrier Neogloboquadrina pachyderma (sin.) ...

• Main Authors: Darling, Kate F., Hippler, Dorothee, Eisenhauer, Anton, Kozdon, Reinhard, Nägler, Thomas F.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2009
• Subjects: Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.7892/boris.38566; http://boris.unibe.ch/38566/

The accurate reconstruction of sea surface temperature (SST) history in climate-sensitive regions (e.g. tropical and polar oceans) became a challenging task in palaeoceanographic research. Biogenic shell carbonate SST proxies successfully developed for tropical regions often fail in cool water environments. Their major regional shortcomings and the cryptic diversity now found within the major high latitude proxy carrier Neogloboquadrina pachyderma (sin.) highlight an urgent need to explore complementary SST proxies for these cool-water regions. Here we incorporate the genetic component into a calibration study of a new SST proxy for the high latitudes. We found that the calcium isotopic composition (δ44/40Ca) of calcite from genotyped net catches and core-top samples of the planktonic foraminifera Neogloboquadrina pachyderma (sin.) is related to temperature and unaffected by genetic variations. The temperature sensitivity has been found to be 0.17 (±0.02)‰ per 1°C, highlighting its potential for downcore ...