Universität zu Köln

Methner, K., Mulch, A., Fiebig, J., Krsnik, E., Loeffler, N., Bajnai, D. and Chamberlain, C. P. (2021). Warm High-Elevation Mid-Latitudes During the Miocene Climatic Optimum: Paleosol Clumped Isotope Temperatures From the Northern Rocky Mountains, USA. Paleoceanogr. Paleoclimatology, 36 (6). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2572-4525

Full text not available from this repository.

Abstract

Interrupting a long-term Cenozoic cooling trend, the Miocene Climatic Optimum (MCO; ca. 17-15 Ma) represents a time interval characterized globally by warmer than present temperatures, lower ice volume, and elevated pCO(2) levels. Establishing quantitative Neogene temperature estimates is an important element in the effort to explore the long-term changes in the carbon cycle and associated climate feedbacks, yet terrestrial temperature records are still sparse. Here, we present a clumped isotope (Delta(47)) temperature record of the MCO from intermontane basins in the Northern Rocky Mountain (NRM) region. Arikareean (22.7-21.5 Ma) to Barstovian (16.9-14.7 Ma) paleosol carbonates from the Hepburn's Mesa Formation (Montana), supplemented with data from fossil localities in western Idaho. These records yield Delta(47)-temperatures ranging from 17 degrees C to 24 degrees C, which are rather warm given the high elevation sites and are further relatively stable (mean of 21 +/- 2 degrees C) leading into and during the MCO until ca. 14.7 Ma. At ca. 14.7 Ma, we observe low Delta(47)-temperatures (8 degrees C-10 degrees C) concomitantly with elevated Delta(47)-temperatures (ca. 22 degrees C). In line with recently suggested climate stability in the NRM region leading into the MCO, our Delta(47)-temperature record, combined with carbon isotope (delta C-13) and reconstructed soil water oxygen isotope (delta O-18(sw)) values, indicates rather stable climate and environmental conditions throughout the MCO. Combining available records from inland sites in the western United States (NRM, Mojave region) points to prevailing stable continental climates even during the MCO.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Methner, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mulch, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fiebig, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krsnik, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Loeffler, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bajnai, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chamberlain, C. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588569
DOI:	10.1029/2020PA003991
Journal or Publication Title:	Paleoceanogr. Paleoclimatology
Volume:	36
Number:	6
Date:	2021
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2572-4525
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ALPINE FORELAND BASIN; MIDDLE MIOCENE; ATMOSPHERIC CIRCULATION; SOIL CARBONATE; ICE VOLUME; EVOLUTION; VEGETATION; IDAHO; PALEOTEMPERATURE; PRECISION Multiple languages Geosciences, Multidisciplinary; Oceanography; Paleontology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58856