A multi-proxy investigation of late-Holocene temperature change and climate-driven fluctuations in sediment sourcing: Simpson Lagoon, Alaska

The significant and ongoing environmental changes in Arctic regions demonstrate the need for quantitative, high-resolution records of pre-industrial climate change in this climatically sensitive region; such records are fundamental for understanding recent anthropogenic changes in the context of nat...

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Bibliographic Details
Published in:Holocene (Sevenoaks) 2018-06, Vol.28 (6), p.984-997
Main Authors: Hanna, Andrea JM, Shanahan, Timothy M, Allison, Mead A, Bianchi, Thomas S, Schreiner, Kathryn M
Format: Article
Language:English
Subjects:
Air temperature
Annual variations
Anthropogenic changes
Anthropogenic factors
Archives & records
Arctic environments
Arctic zone
Clay
Clay minerals
Climate change
Coastal environments
Coastal erosion
Cores
Environmental changes
Erosion
Fluctuations
Fluvial sediments
Glycerol
Granulometry
Holocene
Ice ages
Ice environments
Lagoons
Lake deposits
Lake ice
Lake sediments
Lakes
Marine sediments
Methylation
Mineralogy
Paleoclimate
Records
Resolution
River discharge
River flow
Rivers
Sediment
Sediment discharge
Sediments
Sourcing
Temperature effects
Temporal variations
Water discharge
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Summary:The significant and ongoing environmental changes in Arctic regions demonstrate the need for quantitative, high-resolution records of pre-industrial climate change in this climatically sensitive region; such records are fundamental for understanding recent anthropogenic changes in the context of natural variability. Sediment contained within Arctic coastal environments proximal to large fluvial systems has the ability to record paleoclimate variability on subdecadal to decadal scale resolution, on par with many other terrestrial climate archives (i.e. lake sediments, ice cores). Here, we utilize one such sediment archive from Simpson Lagoon, Alaska, located adjacent to the Colville River Delta to reconstruct temperature variability and fluctuations in sediment sourcing over the past 1700 years. Quantitative reconstructions of summer air temperature are obtained using the branched glycerol dialkyl glycerol tetraether (brGDGT)-derived methylation index of branched tetraethers (MBT’)/cyclization ratio of branched tetraether (CBT) paleothermometer and reveal temperature departures correlative with noted climate events (i.e. ‘Little Ice Age’, ‘Medieval Climate Anomaly’). In addition, temporal variability in sediment sourcing to the lagoon, determined using a multi-proxy approach (i.e. granulometry, elemental analysis, clay mineralogy), broadly corresponds with temperature fluctuations, indicating relative increases in fluvial sediment discharge during colder intervals and decreased river discharge/increased coastal erosion during warmer periods. The Simpson Lagoon record presented in this study is the first temperature reconstruction, to our knowledge, developed from coastal marine sediments in the Alaskan Beaufort Sea.
ISSN:0959-6836
1477-0911
DOI:10.1177/0959683617752845