noaa-coral-12278
Kiritimati Island Porites Coral Microatoll d18O Data
McGregor, H.V.; Fischer, M.J.; Gagan, M.K.; Fink, D.; Woodroffe, C.D.
Kiritimati Island Porites Coral Microatoll d18O Data
2011-11-23
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12278
Investigator
H.V.
McGregor
Investigator
M.J.
Fischer
Investigator
M.K.
Gagan
Investigator
D.
Fink
Investigator
C.D.
Woodroffe
earth science
paleoclimate
corals and sclerosponges
age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
number of samples,null,null,count,null,corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
delta 18O,Porites sp.,95% confidence interval margin of error,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
delta 18O,Porites sp.,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
oxygen isotopes
geoscientificInformation
1978 AD
2007 AD
-28 cal yr BP
-57 cal yr BP
Complete
2
2
-157.3
-157.3
-9
-9
Ocean
Pacific Ocean
Central Pacific Ocean
Kiribati
Kiritimati Island>LATITUDE 2>LONGITUDE -157.3
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
McGregor, H.V., M.J. Fischer, M.K. Gagan, D. Fink,
and C.D. Woodroffe. 2011.
Environmental control of the oxygen isotope composition
of Porites coral microatolls.
Geochimica et Cosmochimica Acta, Vol. 75, No. 14,
pp. 3930-3944, 15 July 2011. doi:10.1016/j.gca.2011.04.017
Woodroffe, C.D. and M.K. Gagan. 2000.
Coral microatolls from the central Pacific record late Holocene El Niño.
Geophys. Res. Lett., Vol. 27, No. 10, pp. 1511-1514, May 15, 2000.
2000GL01140
Woodroffe, C.D., M.R. Beech, and M.K. Gagan. 2003.
Mid-late Holocene El Niño variability in the equatorial Pacific
from coral microatolls.
Geophys. Res. Lett., Vol. 30(7), pp. 1358, doi:10.1029/2002GL015868.
Understanding the influence of climatic and non-climatic factors
on geochemical signals in corals is critical for assessing
coral-derived records of tropical climate variability.
Porites microatolls form large, disk-shaped colonies constrained
in their upward growth by exposure at or close to mean spring
low water level, and occur on Indo-Pacific reefs. Microatolls
appear suitable for paleoclimate reconstruction, however the
systematics of the microatoll chemistry-climate relationship
are yet to be characterized. In this study, the d18O signal
in Porites microatolls from well-flushed reef flats on Kiritimati
(Christmas) Island, central Pacific was investigated for intra-coral
(growth aspect and extension rate effects) and between-coral effects,
and to explore the climate signal contained within their skeletons.
Samples for d18O analysis were taken from six individual transects
from different positions within Porites microatoll XM22. The results
show that: (1) the average standard deviation for the mean d18O
values of transects that represent the same time periods is 0.03
per mil, and is within measurement error for a single analysis
(0.04 per mil); (2) the average standard deviation for time-equivalent,
near-monthly samples along the transects within the same microatoll
is 0.07 per mil and; (3) comparison of the average d18O values of
records for different microatolls from across Kiritimati Island
show only a small between-coral differences of 0.04 per mil
and 0.11 per mil for different time periods. These differences
in mean d18O are within the range for intra- and inter-colony
differences in seasonal and interannual d18O reported for
dome-shaped Porites. Based on these results, a stacked microatoll
d18O record was constructed for the period 1978-2007 for comparison
with published coral d18O records for nearby dome-shaped Porites.
There is a systematic offset between the two types of records,
which is probably due to variations in d18O seawater across
Kiritimati Island. Despite the offset, all records show similar
amplitudes for the seasonal-cycle of d18O, and there is a strong
correlation (r = -0.71) between microatoll d18O and local sea
surface temperature (SST). The d18O-SST slope relationship
for microatolls is -0.15 per mil/°C, very similar to that reported
for fast-growing domed corals (-0.18 per mil to -0.22 per mil/°C).
Statistical analysis of the stacked microatoll d18O record shows
that it is correlated with both local and large-scale climate
variables (primarily SST) at semiannual, annual and interannual
timescales. Our results show that the signal reproducibility
and fidelity of skeletal d18O in coral microatolls is comparable
to that observed for more conventional coral growth forms.
Longer-lived, and fossil, Porites microatolls, where they have
grown in suitably flushed environments, are likely to contain
d18O signals that can significantly extend instrumental records
of tropical climate variability.
STUDY NOTES: Porites coral microatoll oxygen isotope (d18O) data at monthly
resolution, from samples collected near Kiritimati (Christmas)
Island in the central Pacific. Data include individual colony
d18O series, both new and previously published, plus a stacked
d18O record combining data from 3 colonies.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/kiritimati2011.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/kiritimati2011.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11