Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene

Pöppelmeier, Frerk; Scheen, Jeemijn; Blaser, Patrick; Lippold, Jörg; Gutjahr, Marcus; Stocker, Thomas F. (2020). Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene. Paleoceanography and paleoclimatology, 35(11) American Geophysical Union 10.1029/2020pa003973

Poeppelmeier_et_al._2020_Paleoc.pdf - Published Version
Available under License Creative Commons: Attribution-Noncommercial (CC-BY-NC).

Download (2MB) | Preview

The neodymium (Nd) isotopic composition of seawater is a valuable tool for the reconstruction of past water mass provenance and hence deep water geometry. A meaningful interpretation of Nd isotope down‐core records requires knowledge of potential variations of water mass end member characteristics. While often assumed temporally constant, recent investigations revealed glacial‐interglacial variability of the northern and southern Nd isotope end members in the Atlantic. These new constraints have a strong influence on the interpretation of the Atlantic deep water mass evolution, yet the processes responsible for the end member shifts remain uncertain. Here we combine a new compilation of Atlantic Nd isotope reconstructions of the early Holocene with the Nd‐enabled Bern3D model to quantify the recently proposed hypothesis of a northern Nd isotope end member shift during the early Holocene. We achieve the best model‐data fit with a strong increase of the Nd flux in the northern high latitudes by a factor of 3 to 4, which lowers the northern end member signature by about 1 ε‐unit. Our findings thus agree with the rationale that glacially weathered material entered the northern Northwest Atlantic after the ice sheets retreated late in the deglaciation and released substantial amounts of unradiogenic Nd as suggested previously. Further, we find that variations in the strength of the Atlantic Meridional Overturning Circulation (AMOC) cannot reproduce the observed Nd isotope excursions of the compiled data, ruling out an early Holocene AMOC “overshoot.”

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Pöppelmeier, Frerk, Scheen, Jeemijn, Stocker, Thomas


500 Science > 530 Physics
500 Science > 550 Earth sciences & geology




American Geophysical Union




Frerk Pöppelmeier

Date Deposited:

06 Apr 2021 11:43

Last Modified:

05 Dec 2022 15:50

Publisher DOI:





Actions (login required)

Edit item Edit item
Provide Feedback