Ett steg framåt inom paleoceanografi: data oberoende av kärndjupet

Tidsperiod: 2019-01-01 till 2022-12-31

Projektledare: Bryan Lougheed

Finansiär: Vetenskapsrådet

Bidragstyp: Bidrag för anställning eller stipendier

Budget: 4 000 000 SEK

Deep sea sediment archives form the backbone of global palaeoclimate understanding. Such palaeoclimate reconstructions rest upon the geological law of superposition; sediment core layers become older with increasing sediment depth. However, the disturbance of these layers due to bioturbation can cause the relationship between core depth and age to become diffuse. To avoid bioturbation as much as possible, researchers using the age-depth method focus on ocean archives with sediment accumulation rates (SAR) of >10 cm/ka, which exludes vast areas of the ocean floor. I carried out pioneering radiocarbon (14C) dating of single specimen foraminifera at ETH Zürich to show that even severe bioturbation is concealed by the longstanding geochronological state-of-the-art. I also demonstrated the ability to move beyond the current state-of-the-art by carrying out dual 14C and stable isotope (δ18O and δ13C) analysis on single foramifera, thus producing the first ever dataset in palaeoceanography that is wholly independent of the age-depth paradigm and associated issues.I propose to further develop the aforementioned using the latest (installed 2017) world-leading 14C facilities at Uppsala’s Ångström Laboratory to develop a streamlined protocol for dual 14C and stable isotope measurement on single foraminifera. This approach will enable the first extraction of high fidelity palaeoceanographic data from vast, low SAR areas of the ocean floor.