Wahoo Lake, Alaska 11,500 Year Physical Properties and Isotope Data Vachula, R.S.; Chipman, M.L.; Hu, F.S. Vachula, R.S. Chipman, M.L. Hu, F.S. earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,bivalve,null,per mil VPDB,null,paleolimnology,null,null,N,Pisidium; error 0.15 per mil) earth science/paleoclimate/paleolimnology (density,sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,LOI at 550C) earth science/paleoclimate/paleolimnology (calcium carbonate,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,LOI at 950C x (100/44)) earth science/paleoclimate/paleolimnology (delta 13C,bivalve,null,per mil VPDB,null,paleolimnology,null,null,N,Pisidium; error 0.1 per mil) earth science/paleoclimate/paleolimnology (water content,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,LOI at 120C) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (mineral matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,residual lithics and ash after 950C) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Wahoo Lake>LATITUDE 69.076273>LONGITUDE -146.929724) Despite recent progress in understanding high-latitude climate variability, paleoclimate records are scarce from the Alaskan Arctic. We conducted isotopic and sediment analyses at Wahoo Lake to infer Holocene climate variability in northeastern Alaska. Water d18O and dD values from the lake and its inlet/outlet streams suggest that winter precipitation dominates modern water inputs and that evaporation has limited influence on the lake's hydrological budget. The isotopic composition of Pisidium exhibits marked variations during the past 11,500 years, with d18O ranging between -18.7 and -16.2 per mil and d13C between -7.1 and -2.3 per mil (Vienna Pee Dee Belemnite (VPDB)). Elevated d18O and sediment composition from 11.5 to 8.9 kcal. BP suggest evaporative 18O enrichment and arid conditions. Rising lake levels are evidenced by the disappearance of Pisidium and a transition to low-carbonate gyttja ca. 6.3 kcal. BP and by the onset of sediment deposition on an adjacent shelf by 5.3 kcal. BP. These changes coincided with enhanced effective moisture in interior and southern Alaska as inferred from lake-level records and may be related to broad-scale atmospheric circulation changes. In the shelf sediments, carbonate abundance increases markedly at 3.5 kcal. BP, and d18O increases from -18.0 to -16.5 per mil at 2.1 kcal. BP, possibly resulting from increased temperature and/or summer precipitation. After 2.1 kcal. BP, d18O fluctuates with an overall decreasing trend to -17.2 per mil at 0.9 kcal. BP. Late-Holocene variations in our d18O record display coherent patterns with regional glacier fluctuations at centennial to millennial scales, suggesting that d18O minima were related to a combination of low temperatures and enhanced winter snowfall. Holocene variations in organic matter abundance at Wahoo Lake also show broad similarities to total solar irradiance, implying that suborbital solar variability played a role in modulating regional climate and aquatic productivity. STUDY NOTES: Oxygen and carbon isotopes of Pisidium bivalves and lithological composition of sediments from Wahoo Lake, Brooks Foothills, Alaska. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Vachula, R.S. Investigator : Chipman, M.L. Investigator : Hu, F.S. 2017-04-28 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20610 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi-shelf.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso-shelf.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi-shelf.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso-shelf.txt English https://www.ncdc.noaa.gov/paleo/study/20610 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017loi-shelf.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/wahoo2017iso-shelf.txt Richard S. Vachula, Melissa L. Chipman, Feng Sheng Hu2017Holocene climatic change in the Alaskan Arctic as inferred from oxygen-isotope and lake-sediment analyses at Wahoo LakeThe Holocene10.1177/0959683617702230http://journals.sagepub.com/eprint/YpNwYKjWe5bTJ824jDYG/full START YEAR: 11441 cal yr BP * END YEAR: -63 cal yr BP -146.929724 69.076273 -146.929724 69.076273