noaa-ocean-12357
Iceland Shelf 12KYr Quartz and K-Feldspar IRD Data
Andrews, J.T.
Iceland Shelf 12KYr Quartz and K-Feldspar IRD Data
2011-12-28
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12357
Investigator
J.T.
Andrews
earth science
paleoclimate
paleoceanography
potassium feldspar,sediment,null,weight percent,null,paleoceanography,null,x-ray diffraction,N,derived from < 2 mm sediment fraction
earth science
paleoclimate
paleoceanography
age,null,null,calendar year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
quartz,sediment,null,weight percent,null,paleoceanography,null,x-ray diffraction,N,derived from < 2 mm sediment fraction
earth science
paleoclimate
paleoceanography
mineral index,sediment,null,weight percent,null,paleoceanography,averaged,x-ray diffraction,N,quartz and feldspar
earth science
paleoclimate
paleoceanography
mineral index,sediment,one standard deviation,weight percent,null,paleoceanography,averaged,x-ray diffraction,N,quartz and feldspar
earth science
paleoclimate
paleocean
geochemistry
geoscientificInformation
sea ice
12000 cal yr BP
0 cal yr BP
Complete
63.21
66.88
-24.332
-18.5
-658
-106
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-324>LATITUDE 66.52>LONGITUDE -21.15
Ocean
Atlantic Ocean
North Atlantic Ocean
MD99-2263>LATITUDE 66.679>LONGITUDE -24.197
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-316>LATITUDE 66.746>LONGITUDE -18.79
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-315>LATITUDE 66.736>LONGITUDE -24.332
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-325 >LATITUDE 66.573>LONGITUDE -20.996
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-330>LATITUDE 65.87>LONGITUDE -21.08
Ocean
Atlantic Ocean
North Atlantic Ocean
MD99-2266>LATITUDE 66.228>LONGITUDE -23.265
Ocean
Atlantic Ocean
North Atlantic Ocean
MD99-2269>LATITUDE 66.63>LONGITUDE -23.85
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-321>LATITUDE 66.88>LONGITUDE -18.97
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-347>LATITUDE 63.21>LONGITUDE -24.17
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-320>LATITUDE 66.335>LONGITUDE -18.5
Ocean
Atlantic Ocean
North Atlantic Ocean
MD99-2264>LATITUDE 66.679>LONGITUDE -24.197
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-317>LATITUDE 66.58>LONGITUDE -18.87
Ocean
Atlantic Ocean
North Atlantic Ocean
B997-319>LATITUDE 66.442>LONGITUDE -18.851
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
Andrews, J.T. 2009.
Seeking a Holocene drift ice proxy: non-clay mineral variations
from the SW to N-central Iceland shelf: trends, regime shifts,
and periodicities.
Journal of Quaternary Science, Vol. 24, Issue 7, pp. 664-676,
October 2009. DOI: 10.1002/jqs.1257
Quantitative X-ray diffraction analysis of the < 2mm sediment
fraction was carried out on 1257 samples (from the seafloor
and 16 cores) from the Iceland shelf west of 18°W. All but one
core (B997-347PC) were from transects along troughs on the NW
to N-central shelf, an area that in modern and historic times
has been affected by drift ice. The paper focuses on the
non-clay mineralogy of the sediments (excluding calcite
and volcanic glass). Quartz and potassium feldspars occupy
similar positions in an R-mode Principal Component analysis,
and oligoclase feldspar tracks quartz; these minerals are used
as a proxy for ice-rafted detritus (IRD). Accordingly the sum
of these largely foreign minerals (Q&K) (to Icelandic bedrock)
is used as a proxy for drift ice. A stacked, equi-spaced 100-yr
record is developed which shows both low frequency trends
and higher frequency events. The detrended stacked record
compares well with the flux of quartz (mg/cm2/yr) at MD99-2269
off N Iceland. The multi taper method (MTM) indicated that
there are three significant frequencies at the 95% confidence
level with periods of ~2500, 445, and 304 yr. Regime shift
analysis pinpoints intervals when there was a statistically
significant shifts in the average Q&K weight%, and identifies
four IRD-rich events separated by intervals with lower inputs.
There is some association between peaks of IRD input, less dense
surface waters (from 18O data on planktonic foraminifera),
and intervals of moraine building.
STUDY NOTES: The data are derived from quantitative X-ray diffraction analysis
of the < 2 mm sediments from a series of cores around Iceland,
all west of 18°W. The bedrock of Iceland is essentially devoid
of quartz and k-feldspars (Q and K) and these minerals are
frequently used as an index for the occurrence of drift ice
(sea ice or icebergs). The data for all the cores have been
processed using Analyseries so that there is a wt% estimate
every 100-yr between 0 and 12,000 cal yr BP.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2009b/andrews2009b.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/andrews2009b/andrews2009b.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11