Rapid retreat of the southwestern Laurentide Ice Sheet during the Bolling-Allerod interval

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10449372" target="_blank" >RIV/00216208:11310/22:10449372 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uFZJVUz1UR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uFZJVUz1UR</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/G49493.1" target="_blank" >10.1130/G49493.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rapid retreat of the southwestern Laurentide Ice Sheet during the Bolling-Allerod interval

Popis výsledku v původním jazyce

The timing of Laurentide Ice Sheet deglaciation along its southwestern margin controlled the evolution of large glacial lakes and has implications for human migration into the Americas. Accurate reconstruction of the ice sheet&apos;s retreat also constrains glacial isostatic adjustment models and is important for understanding ice-sheet sensitivity to climate forcing. Despite its significance, retreat of the southwestern Laurentide Ice Sheet (SWLIS) is poorly constrained by minimum-limiting C-14 data. We present 26 new cosmogenic Be-10 exposure ages spanning the western Interior Plains, Canada. Using a Bayesian framework, we combine these data with geomorphic mapping, Be-10, and high-quality minimum-limiting C-14 ages to provide an updated chronology. This dataset presents an internally consistent retreat record and indicates that the initial detachment of the SWLIS from its convergence with the Cordilleran Ice Sheet began by ca. 15.0 ka, concurrent with or slightly prior to the onset of the Bolling-Allerod interval (14.7-12.9 ka) and retreated &gt;1200 km to its Younger Dryas (YD) position in similar to 2500 yr. Ice-sheet stabilization at the Cree Lake Moraine facilitated a meltwater drainage route to the Arctic from glacial Lake Agassiz within the YD, but not necessarily at the beginning. Our record of deglaciation and new YD constraints demonstrate deglaciation of the Interior Plains was similar to 60% faster than suggested by minimum C-14 constraints alone. Numerical modeling of this rapid retreat estimates a loss of similar to 3.7 m of sea-level equivalent from the SWLIS during the Bolling-Allerod interval.

Název v anglickém jazyce

Rapid retreat of the southwestern Laurentide Ice Sheet during the Bolling-Allerod interval

Popis výsledku anglicky

The timing of Laurentide Ice Sheet deglaciation along its southwestern margin controlled the evolution of large glacial lakes and has implications for human migration into the Americas. Accurate reconstruction of the ice sheet&apos;s retreat also constrains glacial isostatic adjustment models and is important for understanding ice-sheet sensitivity to climate forcing. Despite its significance, retreat of the southwestern Laurentide Ice Sheet (SWLIS) is poorly constrained by minimum-limiting C-14 data. We present 26 new cosmogenic Be-10 exposure ages spanning the western Interior Plains, Canada. Using a Bayesian framework, we combine these data with geomorphic mapping, Be-10, and high-quality minimum-limiting C-14 ages to provide an updated chronology. This dataset presents an internally consistent retreat record and indicates that the initial detachment of the SWLIS from its convergence with the Cordilleran Ice Sheet began by ca. 15.0 ka, concurrent with or slightly prior to the onset of the Bolling-Allerod interval (14.7-12.9 ka) and retreated &gt;1200 km to its Younger Dryas (YD) position in similar to 2500 yr. Ice-sheet stabilization at the Cree Lake Moraine facilitated a meltwater drainage route to the Arctic from glacial Lake Agassiz within the YD, but not necessarily at the beginning. Our record of deglaciation and new YD constraints demonstrate deglaciation of the Interior Plains was similar to 60% faster than suggested by minimum C-14 constraints alone. Numerical modeling of this rapid retreat estimates a loss of similar to 3.7 m of sea-level equivalent from the SWLIS during the Bolling-Allerod interval.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geology

ISSN

0091-7613

e-ISSN

1943-2682

Svazek periodika

50

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

417-421

Kód UT WoS článku

000775048900007

EID výsledku v databázi Scopus

2-s2.0-85122268559