noaa-ocean-12888
Amchitka Island Alaska 65 Year Corraline Algae Mg/Ca Data
Hetzinger, S.; Halfar, J.; Kronz, A.; Steneck, R.S.; Adey, W.; Lebednik, P.; Schöne, B.R.
Amchitka Island Alaska 65 Year Corraline Algae Mg/Ca Data
2012-04-02
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12888
Investigator
S.
Hetzinger
Investigator
J.
Halfar
Investigator
A.
Kronz
Investigator
R.S.
Steneck
Investigator
W.
Adey
Investigator
P.
Lebednik
Investigator
B.R.
Schöne
earth science
paleoclimate
corals and sclerosponges
magnesium/calcium,Clathromorphum nereostratum,null,dimensionless,null,corals and sclerosponges,null,null,N,coralline red algae species
earth science
paleoclimate
paleoceanography
age,null,null,year Common Era,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
geoscientificInformation
PAGES 2k Network
PAGES Ocean 2k
1902 AD
1967 AD
48 cal yr BP
-17 cal yr BP
Complete
51.4156
51.4156
179.2996
179.2996
-25
-25
Continent
North America
United States Of America
Alaska
Kirlof Point, Amchitka Island>LATITUDE 51.4156>LONGITUDE 179.2996
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
Hetzinger, S., J. Halfar, A. Kronz, R.S. Steneck, W. Adey,
P.A. Lebednik, and B.R. Schöne. 2009.
High-Resolution Mg/Ca Ratios in a Coralline Red Alga as a Proxy
for Bering Sea Temperature variations from 1902 to 1967.
Palaios, June 2009, Vol. 24, no. 6, pp. 406-412.
doi: 10.2110/palo.2008.p08-116r
http://palaios.geoscienceworld.org/content/24/6/406.abstract
We present the first continuous, high-resolution record
of Mg/Ca variations within an encrusting coralline red alga,
Clathromorphum nereostratum, from Amchitka Island, Aleutian
Islands. Mg/Ca ratios of individual growth increments were
analyzed by measuring a single-point, electron-microprobe
transect, yielding a resolution of ~15 samples/year and a
65-year record (1902-1967) of variations. Results show that
Mg/Ca ratios in the high-Mg calcite algal framework display
pronounced annual cyclicity and archive late spring-late fall
sea-surface temperatures (SST) corresponding to the main season
of algal growth. Mg/Ca values correlate well to local SST,
as well as to an air temperature record from the same region.
High spatial correlation to large-scale SST variability in
the subarctic North Pacific is observed, with patterns of
strongest correlation following the direction of major
oceanographic features that play a key role in the exchange
of water masses between the North Pacific and the Bering Sea.
Our data correlate well with a shorter Mg/Ca record from
a second site, corroborating the ability of the alga to reliably
record regional environmental signals. In addition, Mg/Ca ratios
relate well to a 29-year d18O time series measured on the same
sample, providing additional support for the use of Mg in
coralline red algae as a paleotemperature proxy that, unlike
algal-d18O, is not influenced by salinity fluctuations.
Moreover, electron microprobe-based analysis enables higher
sampling resolution and faster analysis, thus providing
a promising approach for future studies of longer
C. nereostratum records and applications to other
coralline species.
STUDY NOTES: 65 year Mg/Ca data from coralline alga collected near Amchitka Island,
Aleutian Islands, Alaska. C. nereostratum is a long-lived, shallow-marine
crustose coralline algae.
Specimen AM-KR-80 8-69-14B
collected in August 1969, 25 water depth,
coralline algae, species: Clathromorphum nereostratum
Sampling location:
Kirlof Point, Amchitka Island, Alaska, 51°24.936'N, 179°17.976'E.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2009/hetzinger2009.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2009/hetzinger2009.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11