Strengthening Atlantic Inflow Across the Mid‐Pleistocene Transition

Abstract

First '100kyr' glacial cycle preceded Marine Isotope Stage 25 (~0.95Ma) • Increasing Atlantic Inflow could promote ice sheet growth given pre-existence of moderately sized ice sheets Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Persistent influence of precession on northern ice sheet variability since the early Pleistocene

“…To this end we have produced a record of ice rafted debris (IRD) accumulation from NE Atlantic ODP Site 983 (60.4°N, 23.6°W, 1983 m water depth; fig. S1), extending the previous record (10)(11)(12) by 500 kyr back to 1.7 Ma (13). The complete record constitutes 9389 samples with an average temporal resolution of 181 years.…”

“…Red circles represent interglacials (numbered; IG28 is a minimum in δ 18 O associated with MIS 28) ( 12 ), white diamonds are deglacial transitions with respect to δ 18 O ( 13 ), blue diamonds and vertical dashed lines represent onset of significant ice rafting, and orange diamonds (and lines) represent the end of TIR events. Orange and blue double-headed arrows highlight lengthening of glacial cycles to approximate multiples of the obliquity period following the late occurrence of T17 (see text and Fig.…”

“…Barker et al . ( 12 ) identified a termination-like event (T14.1 in Fig. 4) ~1.05 Ma within Marine Isotope Stage (MIS) 30.…”

“…6C and table S2; note that this result is insensitive to the age model employed). Barker et al (12) identified a terminationlike event (T14.1 in Fig. 4) ~1.05 Ma within Marine Isotope Stage (MIS) 30.…”

“…1). In turn, this could reflect the proposed net increase in flux of Atlantic surface waters entering the Nordic Seas (the Atlantic inflow) since ~1.2 Ma, promoting enhanced moisture transport and the growth of larger ice sheets with an increasingly southern influence ( 12 ).…”