FN Archimer Export Format
PT J
TI Ice and ocean constraints on early human migrations into North America along the Pacific coast
BT 
AF Praetorius, Summer K.
   Alder, Jay R.
   Condron, Alan
   Mix, Alan C.
   Walczak, Maureen H.
   Caissie, Beth E.
   Erlandson, Jon M.
AS 1:1;2:2;3:3;4:4;5:4;6:1,5;7:6;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 U.S. Geological Survey, Menlo Park, CA 94025, USA
   U.S. Geological Survey, Corvallis, OR 97331, USA
   Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
   Oregon State University, Corvallis, OR 97331, USA
   University of California, Santa Cruz, CA 95064, USA
   University of Oregon, Eugene, OR 97403, USA
C2 US GEOL SURVEY, USA
   US GEOL SURVEY, USA
   WHOI, USA
   UNIV OREGON STATE, USA
   UNIV CALIFORNIA, USA
   UNIV OREGON, USA
IF 11.1
TC 2
UR https://archimer.ifremer.fr/doc/00820/93170/99763.pdf
   https://archimer.ifremer.fr/doc/00820/93170/99764.pdf
   https://archimer.ifremer.fr/doc/00820/93170/99765.xlsx
   https://archimer.ifremer.fr/doc/00820/93170/99766.xlsx
   https://archimer.ifremer.fr/doc/00820/93170/99767.xlsx
   https://archimer.ifremer.fr/doc/00820/93170/99768.xlsx
   https://archimer.ifremer.fr/doc/00820/93170/99769.xlsx
LA English
DT Article
CR MD 126 / MONA
BO Marion Dufresne
DE ;paleoceanography;sea ice;human migration;North Pacific;paleoclimate
AB Founding populations of the first Americans likely occupied parts of Beringia during the Last Glacial Maximum (LGM). The timing, pathways, and modes of their southward transit remain unknown, but blockage of the interior route by North American ice sheets between ~26 and 14 cal kyr BP (ka) favors a coastal route during this period. Using models and paleoceanographic data from the North Pacific, we identify climatically favorable intervals when humans could have plausibly traversed the Cordilleran coastal corridor during the terminal Pleistocene. Model simulations suggest that northward coastal currents strengthened during the LGM and at times of enhanced freshwater input, making southward transit by boat more difficult. Repeated Cordilleran glacial-calving events would have further challenged coastal transit on land and at sea. Following these events, ice-free coastal areas opened and seasonal sea ice was present along the Alaskan margin until at least 15 ka. Given evidence for humans south of the ice sheets by 16 ka and possibly earlier, we posit that early people may have taken advantage of winter sea ice that connected islands and coastal refugia. Marine ice-edge habitats offer a rich food supply and traversing coastal sea ice could have mitigated the difficulty of traveling southward in watercraft or on land over glaciers. We identify 24.5 to 22 ka and 16.4 to 14.8 ka as environmentally favorable time periods for coastal migration, when climate conditions provided both winter sea ice and ice-free summer conditions that facilitated year-round marine resource diversity and multiple modes of mobility along the North Pacific coast. 
PY 2023
PD FEB
SO Proceedings Of The National Academy Of Sciences Of The United States Of America
SN 0027-8424
PU Proceedings of the National Academy of Sciences
VL 120
IS 7
UT 001169167100001
DI 10.1073/pnas.2208738120
ID 93170
ER

EF