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NG Guest lecture | Torbjörn Törnqvist

The last deglaciation after halftime: A sea-level perspective

Guest lecture by Professor Torbjörn E. Törnqvist
Department of Earth and Environmental Sciences, Tulane University

Torbjörn E. Törnqvist, Department of Earth and Environmental Sciences, Tulane UniversityThe early Holocene is the most recent pre-industrial warm interval with rapidly melting ice sheets, yet high-resolution relative sea-level (RSL) records from this time interval barely exist. Here we present new RSL data from basal marsh peats in the Mississippi Delta that cover the time period from 10 to 8 ka. The latter portion of this record captures the 8.2 ka cooling event that was triggered by the final drainage of proglacial Lake Agassiz. This allows us to estimate the magnitude of the associated sea-level jump at this time (1.5 ± 0.7 m). More recent work has pushed our record further back in time, showing that RSL data from the US Gulf Coast plot much higher (up to about 15 m) than globally averaged “eustatic” sea-level data of similar age. In association with this, rates of RSL rise are only about 5 mm/yr, considerably lower than what is seen from records in the opposite hemisphere (notably SE Asia). Glacial isostatic adjustment modeling is used to assess how this contrast may be explained by the relative contributions of the Laurentide and Antarctic ice sheets to global sea-level rise during this time.

Professor Törnqvist’s Homepage: www2.tulane.edu/sse/eens/faculty-and-staff/tornqvist.cfm

Professor Törnqvist’s Quaternary Research Group: www.tulane.edu/~tor

Time: May 4, 2018, 11.00–12.00
Place: Högbomsalen, Geoscience building, Stockholm University

All warmly welcome!

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