Holocene Salinity Variations in Great Salt Lake, Utah: Application &amp; Calibration of the ACE Salinity Proxy

So, Rachel; Lowenstein, Tim; Jagniecki, Elliott; Tierney, Jessica E.; Feakins, Sarah J.

doi:10.1002/essoar.10509823.1

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“…We measured the individual isoGDGT and brGDGT abundances along with archaeol abundance (data available at NOAA; So et al., 2022). IsoGDGTs are dominated by GDGT‐0 (Figure 3a) and we show the distribution of the remaining isoGDGTs (Figure 3b).…”

Section: Resultsmentioning

confidence: 99%

Holocene Water Balance Variations in Great Salt Lake, Utah: Application of GDGT Indices and the ACE Salinity Proxy

Lowenstein

Jagniecki

et al. 2023

Paleoceanog and Paleoclimatol

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Paleoclimate reconstructions of the Holocene provide insights into the stability or sensitivity of our present climate state. While it is a time of relative climatic stability compared to the glacial-interglacial cycles that preceded it, the changes may in some cases be profound especially in zones prone to drought-stress. In southwestern North America, lake sediments and speleothems record a generally wet early Holocene (11-8 ka), and a dry middle Holocene (8-4 ka) with a return to relatively moist late Holocene (Lachniet et al., 2020 and references therein). Although many Holocene climate modeling studies have struggled to simulate the mid-Holocene warmth, recent modeling has found this emerges with the addition of vegetation feedbacks (Thompson et al., 2022). As the mid-Holocene warming may be an analog for the current warming, it is studied here as context for the current drought in the region.Great Salt Lake (GSL), UT, USA, at 41.1°N is a remnant of a larger lake, Lake Bonneville. Lake Bonneville reached its maximum size during the termination of the Last Glacial Maximum (LGM) at ∼18 ka then shrank to the areal extent of modern GSL by ∼13 ka (Oviatt et al., 2021). The drying between the LGM and Holocene greatly increased salinity in the residual lake and left behind the Bonneville salt flats. This drastic shrinking and lake level drop was recorded in preserved shorelines (Oviatt et al., 2021). In contrast, any recessional shorelines of the mid-Holocene arid interval have been lost to subsequent late Holocene transgressions. Instead, continuous geochemical records from sediment cores have potential to reconstruct Holocene climate. As its name implies, GSL is salty with current salinity of 120-180 g/L (data for 2010-2021; Rupke & McDonald, 2012),

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Section: Resultsmentioning

confidence: 99%