noaa-lake-8663
Takahula Lake, Alaska 8,000 Year Stable Isotope Data
Clegg, B.F.; Hu, F.S.
Takahula Lake, Alaska 8,000 Year Stable Isotope Data
2010-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/8663
Investigator
B.F.
Clegg
Investigator
F.S.
Hu
earth science
paleoclimate
instrumental
collection date,null,null,null,null,instrumental,null,null,C,null
earth science
paleoclimate
paleolimnology
age at sample end,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
instrumental
longitude,null,null,degree east,null,instrumental,null,null,N,null
earth science
paleoclimate
paleolimnology
depth at sample start,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
instrumental
delta 18O,lake water,null,per mil VSMOW,null,instrumental,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,charophyte encrustation
earth science
paleoclimate
paleolimnology
calcium carbonate,null,null,gram per square centimeter per year,null,paleolimnology,null,loss on ignition,N,loss on ignition 950 degrees
earth science
paleoclimate
paleolimnology
depth at sample end,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,charophyte encrustation
earth science
paleoclimate
paleolimnology
age at sample start,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
instrumental
delta 2H,lake water,null,per mil VSMOW,null,instrumental,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
instrumental
air temperature,null,null,degree Fahrenheit,null,instrumental,null,null,N,null
earth science
paleoclimate
instrumental
lake surface temperature,null,null,degree Fahrenheit,null,instrumental,null,null,N,null
earth science
paleoclimate
instrumental
notes,null,null,null,null,instrumental,null,null,C,null
earth science
paleoclimate
instrumental
latitude,null,null,degree north,null,instrumental,null,null,N,null
earth science
paleoclimate
paleolimnology
oxygen isotopes
geoscientificInformation
8057 cal yr BP
-52 cal yr BP
Complete
67.35
67.35
-153.67
-153.67
275
275
Continent
North America
United States Of America
Alaska
Takahula Lake>LATITUDE 67.35>LONGITUDE -153.67
None
Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Clegg, B.F., Hu, F.S. 2010. An oxygen-isotope record of Holocene climate change in the south-central Brooks Range, Alaska. Quaternary Science Reviews, 29, 928-939.
Understanding the ecological and socio-economic impacts of climatic warming requires knowledge of associated changes in moisture balance. Reconstructions of Holocene moisture-balance variation offer indispensible baseline information against which recent changes can be evaluated. In Alaska, little is known about variations in moisture balance during the middle- and late- Holocene. We analyzed Chara-stem encrustations in the sediments of Takahula Lake, south-central Brooks Range, for oxygen and carbon isotope composition to infer climatic change over the past 8000 years. To help constrain climatic interpretations of the sediment d18O record, we also analyzed water samples from Takahula and other lakes in the region for oxygen and hydrogen isotope composition. Results show that winter precipitation dominates the water balance of these lakes and that post-input evaporation is a key control of lake-water isotope composition of Takahula Lake. Stratigraphic patterns in Chara-d18O, supplemented by those in d13C and sediment lithology, reveal distinct changes in effective moisture (precipitation minus evaporation) over the past 8000 years. Effective moisture was relatively high from 8000 to 5000 cal. BP, with marked fluctuations between 6800 and 5000 cal. BP. It then decreased to reach a minimum around 4000 cal. BP and increased with fluctuations from 4000 to ~2500 cal. BP, followed by a decreasing trend toward the present that was interrupted by a wet Little Ice Age (centered at 400 cal. BP). Aridity during the 20th century was among the highest of the entire 8000-year record. The Chara-d18O values around 5600 cal. BP and around 400 cal. BP are up to 5ŋ lower than at present and ~2.3ŋ lower than that of the modern input water to the lake. These exceptionally low values suggest that factors other than effective moisture must have contributed to the pronounced variations in the Takahula Lake d18O record. These factors probably include increased winter precipitation related to the position and strength of the Aleutian Low, decreased temperatures, as well as increased lake-ice cover and associated reductions in evaporation. At millennial timescales, the temporal patterns of moisture-balance shifts at Takahula Lake are broadly coherent with those inferred from previous paleoclimate records from the region.
STUDY NOTES: Centennial resolution isotope and geochemical data for Takahula Lake, Alaska, for the past 8000 years, plus surface lake-water isotope data from other Brooks Range lakes.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/takahula2010.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/takahula2010.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11