Millennial-scale variability in Holocene aquatic productivity from Burial Lake, Arctic Alaska

Finkenbinder, Matthew S.; Abbott, Mark B.; Stoner, J. S.; Ortiz, Joseph D.; Finney, Bruce P.; Dorfman, J. M.; Stansell, Nathan D.

doi:10.1016/j.quascirev.2018.03.019

Cited by 5 publications

(15 citation statements)

References 101 publications

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“…Burial Lake levels (B) fluctuated in response to climate and basin fill (Finkenbinder et al . , ). Chironomid‐based palaeotemperature records from Zagoskin (C) and Burial Lakes (D) indicate lower July temperatures during the Last Glacial.…”

Section: Discussionmentioning

confidence: 99%

“…The age‐depth chronology of this core was established by Finkenbinder et al . (, ) using the CLAM age modelling package (Blaauw ). The chronology is informed by 15 radiocarbon‐dated terrestrial macrofossils (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The age‐depth model of the Burial Lake sediment core, with white circles showing accepted radiocarbon dates and crosses depicting rejected dates (Finkenbinder et al . , ).…”

Section: Methodsmentioning

confidence: 99%

“…The chironomid‐based palaeotemperature record from Burial Lake was updated to the age‐depth model presented in Finkenbinder et al . (), which is used in this study.…”

Section: Methodsmentioning

confidence: 99%

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Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period

Vachula

Huang

Russell

et al. 2020

Boreas

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Our understanding of the timing of human arrival to the Americas remains fragmented, despite decades of active research and debate. Genetic research has recently led to the ‘Beringian standstill hypothesis’ (BSH), which suggests an isolated group of humans lived somewhere in Beringia for millennia during the Last Glacial, before a subgroup migrated southward into the American continents about 14 ka. Recently published organic geochemical data suggest human presence around Lake E5 on the Alaskan North Slope during the Last Glacial; however, these biomarker proxies, namely faecal sterols and polycyclic aromatic hydrocarbons (PAHs), are relatively novel and require replication to bolster their support of the BSH. We present new analyses of these biomarkers in the sediment archive of Burial Lake (latitude 68°26′N, longitude 159°10′W m a.s.l.) in northwestern Alaska. Our analyses corroborate that humans were present in Beringia during the Last Glacial and that they likely promoted fire activity. Our data also suggest that humans coexisted with Ice Age megafauna for millennia prior to their eventual extinction at the end of the Last Glacial. Lastly, we identify fire as an overlooked ecological component of the mammoth steppe ecosystem.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The age‐depth model of the Burial Lake sediment core, with white circles showing accepted radiocarbon dates and crosses depicting rejected dates (Finkenbinder et al . , ).…”

Section: Methodsmentioning

confidence: 99%

“…The chironomid‐based palaeotemperature record from Burial Lake was updated to the age‐depth model presented in Finkenbinder et al . (), which is used in this study.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period

Vachula

Huang

Russell

et al. 2020

Boreas

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“…Estimates of mean annual air temperature (MAAT) in the upper NRB from climate reanalyses are between −7 and −9 °C, which results in the presence of near-surface permafrost; active layer thicknesses are up to 50 cm depth (Pastick et al, 2015). Further information about the Burial Lake setting, sediments, fossil pollen and chironomid taxonomy can be found in Kurek et al (2009), Abbott et al (2010) and Finkenbinder et al ( , 2018. The site descriptions here focus on hydroclimatic characteristics, which are pertinent to surface water and meteoric water isotope values and variations.…”

Section: Study Site and Regional Isotope Hydrologymentioning

confidence: 99%

A stable isotope record of late Quaternary hydrologic change in the northwestern Brooks Range, Alaska (eastern Beringia)

King

Anderson

Abbott

et al. 2021

J Quaternary Science

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A submillennial‐resolution record of lake water oxygen isotope composition (δ18O) from chironomid head capsules is presented from Burial Lake, northwest Alaska. The record spans the Last Glacial Maximum (LGM; ~20–16k cal a bp) to the present and shows a series of large lake δ18O shifts (~5‰). Relatively low δ18O values occurred during a period covering the LGM, when the lake was a shallow, closed‐basin pond. Higher values characterize deglaciation (~16–11.5k cal a bp) when the lake was still closed but lake levels were higher. A rapid decline between ~11 and 10.5k cal a bp indicates that lake levels rose to overflowing. Lake δ18O values are interpreted to reflect the combined effects of changes in lake hydrology, growing season temperature and meteoric source water as well as large‐scale environmental changes impacting this site, including opening of the Bering Strait and shifts in atmospheric circulation patterns related to ice‐sheet dynamics. The results indicate significant shifts in precipitation minus evaporation across the late Pleistocene to early Holocene transition, which are consistent with temporal patterns of vegetation change and paludification. This study provides new perspectives on the paleohydrology of eastern Beringia concomitant with human migration and major turnover in megafaunal assemblages.

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A Rapid, Deterministic Age‐Depth Modeling Routine for Geological Sequences With Inherent Depth Uncertainty

Lougheed

Obrochta

2019

Paleoceanog and Paleoclimatol

131

130

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Traditional approaches to age‐depth modeling typically assume no uncertainty for the depth value of dated intervals. However, such an assumption may not be fully valid in the case of poor coring recovery or significant sediment deformation, as well as in the case of a large subsampling interval. In consideration of these issues, we present a new age‐depth modeling routine, Undatable, which includes uncertainty in both age and depth. Undatable uses Bayesian radiocarbon (14C) calibration software (MatCal) and a deterministic approach with a positive sediment accumulation rate assumed a priori which, combined with efficient programming practices, allows for the rapid production (in a matter of seconds in many cases) of age‐depth models for multiple types of geological archives. Undatable has so far been successfully applied to coral archives, as well as sediment archives from estuarine, lacustrine, and deep‐sea environments. Through the inclusion of a bootstrapping option, the software performs particularly well in the case of a large scatter in age‐depth constraints by expanding the uncertainty envelope of the age‐depth model. Unlike other deterministic models, increasing the density of age‐depth constraints results in increased precision in Undatable, even at centennial scale, thus emulating the results of probabilistic models. In addition to the code itself, we also provide an interactive graphical user interface (GUI) that allows users to experiment with multiple age‐depth model settings to investigate the sensitivity of a given data set to multiple parameters.

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Millennial-scale variability in Holocene aquatic productivity from Burial Lake, Arctic Alaska

Cited by 5 publications

References 101 publications

Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period

Sedimentary biomarkers reaffirm human impacts on northern Beringian ecosystems during the Last Glacial period

A stable isotope record of late Quaternary hydrologic change in the northwestern Brooks Range, Alaska (eastern Beringia)

A Rapid, Deterministic Age‐Depth Modeling Routine for Geological Sequences With Inherent Depth Uncertainty

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