Universität zu Köln

Allstaedt, Frederik J., Koutsodendris, Andreas ORCID: 0000-0003-4236-7508, Appel, Erwin, Roesler, Wolfgang, Reichgelt, Tammo, Kaboth-Bahr, Stefanie ORCID: 0000-0002-4449-2938, Prokopenko, Alexander A. and Pross, Joerg (2021). Late Pliocene to early Pleistocene climate dynamics in western North America based on a new pollen record from paleo-Lake Idaho. Palaeobiodiversity Palaeoenvironments, 101 (1). S. 177 - 196. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1867-1608

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Abstract

Marked by the expansion of ice sheets in the high latitudes, the intensification of Northern Hemisphere glaciation across the Plio/Pleistocene transition at similar to 2.7 Ma represents a critical interval of late Neogene climate evolution. To date, the characteristics of climate change in North America during that time and its imprint on vegetation has remained poorly constrained because of the lack of continuous, highly resolved terrestrial records. We here assess the vegetation dynamics in northwestern North America during the late Pliocene and early Pleistocene (c. 2.8-2.4 Ma) based on a pollen record from a lacustrine sequence from paleo-Lake Idaho, western Snake River Plain (USA) that has been retrieved within the framework of an International Continental Drilling Program (ICDP) coring campaign. Our data indicate a sensitive response of forest ecosystems to glacial/interglacial variability paced by orbital obliquity across the study interval, and also highlight a distinct expansion of steppic elements that likely occurs during the first strong glacial of the Pleistocene, i.e. Marine Isotope Stage 100. The pollen data document a major forest biome change at similar to 2.6 Ma that is marked by the replacement of conifer-dominated forests by open mixed forests. Quantitative pollen-based climate estimates suggest that this forest reorganisation was associated with an increase in precipitation from the late Pliocene to the early Pleistocene. We attribute this shift to an enhanced moisture transport from the subarctic Pacific Ocean to North America, confirming the hypothesis that ocean-circulation changes were instrumental in the intensification of Northern Hemisphere glaciation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Allstaedt, Frederik J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koutsodendris, Andreas UNSPECIFIED orcid.org/0000-0003-4236-7508 UNSPECIFIED Appel, Erwin UNSPECIFIED UNSPECIFIED UNSPECIFIED Roesler, Wolfgang UNSPECIFIED UNSPECIFIED UNSPECIFIED Reichgelt, Tammo UNSPECIFIED UNSPECIFIED UNSPECIFIED Kaboth-Bahr, Stefanie UNSPECIFIED orcid.org/0000-0002-4449-2938 UNSPECIFIED Prokopenko, Alexander A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pross, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-590403
DOI:	10.1007/s12549-020-00460-1
Journal or Publication Title:	Palaeobiodiversity Palaeoenvironments
Volume:	101
Number:	1
Page Range:	S. 177 - 196
Date:	2021
Publisher:	SPRINGER HEIDELBERG
Place of Publication:	HEIDELBERG
ISSN:	1867-1608
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SNAKE RIVER PLAIN; SCIENTIFIC DRILLING PROJECT; TENAGHI PHILIPPON; TIBETAN PLATEAU; COEXISTENCE APPROACH; MIDDLE PLEISTOCENE; VOLCANIC-ROCKS; SIERRA-NEVADA; UNITED-STATES; VEGETATION Multiple languages Biodiversity Conservation; Paleontology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59040