noaa-lake-13077
Kepler Lake, Alaska 800 Year Multiproxy Sediment Data
Gonyo, A.W.; Yu, Z.; Bebout, G.E.
Kepler Lake, Alaska 800 Year Multiproxy Sediment Data
2012-06-30
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13077
Investigator
A.W.
Gonyo
Investigator
Z.
Yu
Investigator
G.E.
Bebout
earth science
paleoclimate
paleolimnology
calcium carbonate,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,null
earth science
paleoclimate
paleolimnology
carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,null
earth science
paleoclimate
paleolimnology
density,sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 15N,organic matter,null,per mil AIR,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
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 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,calcite
earth science
paleoclimate
paleolimnology
delta 13C,organic matter,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,calcite
earth science
paleoclimate
paleolimnology
mineral matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,null
earth science
paleoclimate
paleolimnology
oxygen isotopes
earth science
paleoclimate
paleolimnology
carbon isotopes
earth science
paleoclimate
paleolimnology
physical properties
earth science
paleoclimate
paleolimnology
geochemistry
geoscientificInformation
Arctic
Little Ice Age (LIA)
PAGES Arctic 2k
1222 AD
2007 AD
728 cal yr BP
-57 cal yr BP
Complete
61.5544
61.5544
-149.2119
-149.2119
22
22
Continent
North America
United States Of America
Alaska
Kepler Lake>LATITUDE 61.5544>LONGITUDE -149.2119
None
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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
Gonyo, A.W., Z. Yu, and G.E. Bebout. 2012.
Late Holocene change in climate and atmospheric circulation inferred
from geochemical records at Kepler Lake, south-central Alaska.
Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 55-67.
DOI: 10.1007/s10933-012-9603-8
Climate records during the last millennium are essential in placing
recent anthropogenic-induced climate change into the context of
natural climatic variability. However, detailed records are still
sparse in Alaska, and these records would help elucidate climate
patterns and possible forcing mechanisms. Here we present a
multiple-proxy sedimentary record from Kepler Lake in south-central
Alaska to reconstruct climatic and environmental changes over the
last 800 years. Two short cores (85 and 101 cm long) from this
groundwater-fed marl lake provide a detailed stable isotope
and sediment lithological record with chronology based on four
AMS 14C dates on terrestrial macrofossils and 210Pb analysis.
The d18O values of inorganic calcite (CaCO3) range from -17.0
to -15.7 ‰, with the highest values during the period of 1450-1850 AD,
coeval with the well-documented Little Ice Age (LIA) cold interval
in Alaska. The high d18O values during the cold LIA are interpreted
as reflecting shifts in atmospheric circulation. A weakening of
the wintertime Aleutian low pressure system residing over the Gulf
of Alaska during the LIA would have resulted in 18O-enriched winter
precipitation as well as a colder and possibly drier winter climate
in south-central Alaska. Also, elevated calcite contents of >80 %
during the LIA reflect a lowering of lake level and/or enhanced
seasonality (warmer summer and colder winter), as calcite
precipitation in freshwater lakes is primarily a function of peak
summer temperature and water depth. This interpretation is also
supported by high d13C values, likely reflecting high aquatic
productivity or increased residence times of the lake water
during lower lake levels. The lower lake levels and warmer
summers would have increased evaporative enrichment in 18O,
also contributing to the high d18O values during the LIA.
Our results indicate that changes in atmospheric circulation
were an important component of climate change during the last
millennium, exerting strong influence on regional climate
in Alaska and the Arctic.
STUDY NOTES: Multiproxy sediment data from Kepler Lake, south-central Alaska,
for the past 800 years. Kepler Lake is a groundwater-fed marl lake.
Paleoenvironmental proxies measured include stable isotopes,
C/N ratios, Loss-on-ignition, and bulk sediment density.
Kepler Lake, Alaska: 61°33'16"N, 149°12'43"W, 22m elevation.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/kepler2012.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/kepler2012.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11