@article{c94301b8fb4f47d8aebe52bac2f182ee,
title = "BrGDGT temperature reconstruction from interior Alaska: Assessing 14,000 years of deglacial to Holocene temperature variability and potential effects on early human settlement",
abstract = "Aeolian deposits in the middle Tanana Valley of central Alaska offer a well-preserved record of paleoenvironmental change since the deglacial period (c. 16,000–11,000 cal yr BP). These deposits also contain some of North America's oldest archaeological occupations (c. 14,000–13,000 cal yr BP), making this region critically important for understanding human migration into the high latitudes and the Americas. Major research questions involve assessing the magnitude of deglacial climatic change and the influence of climate on early human groups. This study uses branched glycerol dialkyl glycerol tetraethers (brGDGTs) from six loess-paleosol sequences to develop a quantitative paleotemperature record within terrestrial locations in the Tanana basin that are close to archaeological sites. BrGDGT-derived temperatures demonstrate a lack of cooler temperatures associated with deglacial conditions, making this region relatively “warm” compared to other parts of the globe. Additionally, our brGDGT record shows little coherent temperature change associated with deglacial climate variability (e.g., B{\o}lling-Aller{\o}d, Younger Dryas), and Holocene temperatures are relatively stable as well, indicating that temperature fluctuation was not the main driver of environmental or archaeological change over time. We recommend averaging data across multiple terrestrial exposures to produce regional temperature reconstrutions.",
keywords = "Biomarkers, brGDGTs, Central Alaska, Holocene, Late pleistocene, Loess-paleosol stratigraphy, Paleothermometry, Subarctic",
author = "Kielhofer, {Jennifer R.} and Tierney, {Jessica E.} and Reuther, {Joshua D.} and Potter, {Ben A.} and Holmes, {Charles E.} and Lano{\"e}, {Fran{\c c}ois B.} and Esdale, {Julie A.} and Wooller, {Matthew J.} and Bigelow, {Nancy H.}",
note = "Funding Information: This work was supported in part by the National Science Foundation Arctic Social Sciences and Office of Polar Programs Doctoral Dissertation Research Improvement Grant (DDRIG #1636716). We thank Dr. Vance Holliday, Dr. Jay Quade, Dr. Andrew Cohen, and Dr. Christopher Miller for their feedback on earlier versions of this manuscript during J. Kielhofer's doctoral dissertation. We thank the journal editors and reviewers for their insightful comments and valuable assistance with the final versions of this manuscript. Many thanks to Dr. Kaustubh Thirumalai (University of Arizona) for assistance with MATLAB coding. We also thank Dr. Nicholas Patton (Desert Research Institute) for assistance with GIS and the supplemental map figures. Thanks to Dr. Eric McDonald and Dr. Brad Sion of the Desert Research Institute for postdoctoral research support, time and space to work on this manuscript, Dr. Andrew Du of Colorado State University for use of his laboratory space, and Dr. Edward Henry of Colorado State University for workspace and collaboration in the Center for Research in Archaeogeophysics and Geoarchaeology. Many thanks to Dr. Paul Zander and Patrick Murphy for laboratory assistance in the University of Arizona Organic Geochemistry Laboratory. We would also like to acknowledge the U.S. Army Garrison, Alaska for access to the Hurricane Bluff site, located on the Donnelly Training Area, Fort Wainwright, and use of data. Finally, we thank the many individuals who helped with all stages of this project. Funding Information: This work was supported in part by the National Science Foundation Arctic Social Sciences and Office of Polar Programs Doctoral Dissertation Research Improvement Grant ( DDRIG #1636716 ). We thank Dr. Vance Holliday, Dr. Jay Quade, Dr. Andrew Cohen, and Dr. Christopher Miller for their feedback on earlier versions of this manuscript during J. Kielhofer{\textquoteright}s doctoral dissertation. We thank the journal editors and reviewers for their insightful comments and valuable assistance with the final versions of this manuscript. Many thanks to Dr. Kaustubh Thirumalai (University of Arizona) for assistance with MATLAB coding. We also thank Dr. Nicholas Patton (Desert Research Institute) for assistance with GIS and the supplemental map figures. Thanks to Dr. Eric McDonald and Dr. Brad Sion of the Desert Research Institute for postdoctoral research support, time and space to work on this manuscript, Dr. Andrew Du of Colorado State University for use of his laboratory space, and Dr. Edward Henry of Colorado State University for workspace and collaboration in the Center for Research in Archaeogeophysics and Geoarchaeology. Many thanks to Dr. Paul Zander and Patrick Murphy for laboratory assistance in the University of Arizona Organic Geochemistry Laboratory. We would also like to acknowledge the U.S. Army Garrison, Alaska for access to the Hurricane Bluff site, located on the Donnelly Training Area, Fort Wainwright, and use of data. Finally, we thank the many individuals who helped with all stages of this project. Publisher Copyright: {\textcopyright} 2023",
year = "2023",
month = mar,
day = "1",
doi = "10.1016/j.quascirev.2023.107979",
language = "English (US)",
volume = "303",
journal = "Quaternary Science Reviews",
issn = "0277-3791",
publisher = "Elsevier Limited",
}