noaa-lake-13081
Iceberg Lake, Alaska 1500 Year Varve Thickness Data
Diedrich, K.E.; Loso, M.G.
Iceberg Lake, Alaska 1500 Year Varve Thickness Data
2012-06-30
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13081
Investigator
K.E.
Diedrich
Investigator
M.G.
Loso
earth science
paleoclimate
paleolimnology
depth at sample start,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
sample identification,null,null,null,null,paleolimnology,null,null,C,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
varve thickness,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
physical properties
geoscientificInformation
Arctic
Little Ice Age (LIA)
PAGES Arctic 2k
1350 AD
1897 AD
600 cal yr BP
53 cal yr BP
Complete
60.783
60.783
-142.95
-142.95
933
933
Continent
North America
United States Of America
Alaska
Iceberg Lake>LATITUDE 60.783>LONGITUDE -142.95
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
Diedrich, K.E. and M.G. Loso. 2012.
Transient impacts of Little Ice Age glacier expansion on sedimentation
processes at glacier-dammed Iceberg Lake, southcentral Alaska.
Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 115-132.
DOI: 10.1007/s10933-012-9614-5
Iceberg Lake, a glacier-dammed proglacial lake in southern Alaska,
contains a 1,500+ year varve record complicated by a history of
episodic lake-level changes associated with fluctuations in
ice-dam thickness and position. To better understand the basinwide
glaciolacustrine response to late Holocene climate variability,
we collected five cores from two areas in the lake, including
a previously unexamined deepwater area distal from inlet streams.
Based on eight AMS 14C dates, and correlations among our cores
and previously documented outcrops, we describe ~1,000 years
of stratigraphy from each area. Deposition at both areas was
dominated by fine-grained varves, but cores from the distal area
uniquely contain coarser deposits, including rhythmites and graded
sand beds, that we attribute to deposition of a subaqueous outwash
fan-delta between ~1250 and 1650 AD. We attribute this event to
thickening of the impounding glacier and consequent incursion of
the glacier margin, and an associated lateral moraine, into the lake.
This result suggests an early onset of the Little Ice Age (LIA)
glacial advance in this region. Changes in basinwide circulation
and sedimentation associated with this event probably caused minor
thickening of varves used previously to reconstruct summer
temperatures, reducing sensitivity of that record to early LIA
cooling. The basinwide impact of this event illustrates the
potentially significant spatial and temporal variability of
lacustrine sedimentary processes in dynamic glacial landscapes.
STUDY NOTES: Varve thickness measurements from Iceberg Lake, southern Alaska.
Iceberg Lake, Alaska: 60°47'N, 142°57'W, 933m elev.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/iceberg2012.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/iceberg2012.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11