Dresden 2020 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 5: Poster Session

UP 5.2: Poster

Mittwoch, 18. März 2020, 14:00–16:00, P2/4OG

Assessing variability and possible decline of Atlantic Overturning in the past two millennia through temperature fingerprints — •Shirin Ermis¹, Paola Moffa-Sánchez², Alexandra Jahn³, and Kira Rehfeld¹ — ¹Institute of Environmental Physics, INF 229, 69120 Heidelberg, Germany — ²Department of Geography, Lower Mount Joy, South Road, Durham, DH1 3LE, UK — ³Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Campus Box 450, Boulder, CO 80309-0450, USA

The Atlantic Meridional Overturning Circulation (AMOC) is essential to maintain the temperate climates of Europe and North America. It redistributes heat from the tropics, and stores carbon in the deep ocean. Yet, its variability and evolution are largely unknown due to a lack of direct circulation measurements. Previous studies suggest a connection between the variabilities of the AMOC strength and a temperature dipole in the North Atlantic. These results suggest a substantial decline in the strength of the overturning at around 1850.

Here, we compare temperature reconstructions from four sediment cores in the North Atlantic and model simulations of CESM1 as well as the HadCM3 for the past two millennia. We test the robustness of previously used temperature fingerprints and assess drivers of variability in the ocean circulation and a possible decline in strength. Due to the particularly high resolution of available temperature reconstructions this study could provide new insights into the variability of Atlantic Overturning on decadal time scales and beyond.