noaa-coral-9819
Indo-Pacific Warm Pool Mid-Holocene Coral Sr/Ca SST Reconstructions
Abram, N.J.; McGregor, H.V.; Gagan, M.K.; Hantoro, W.S.; Suwargadi, B.W.
Indo-Pacific Warm Pool Mid-Holocene Coral Sr/Ca SST Reconstructions
2010-11-16
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9819
Investigator
N.J.
Abram
Investigator
H.V.
McGregor
Investigator
M.K.
Gagan
Investigator
W.S.
Hantoro
Investigator
B.W.
Suwargadi
earth science
paleoclimate
corals and sclerosponges
sample identification,null,null,null,null,corals and sclerosponges,null,null,C,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
sea surface temperature,strontium/calcium,null,degree Celsius,null,climate reconstructions|corals and sclerosponges,anomalized,null,N,anomalized to modern instrumental
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
age,null,two standard deviations,year,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
sea surface temperature,strontium/calcium,two standard deviations,degree Celsius,null,climate reconstructions|corals and sclerosponges,anomalized,null,N,anomalized to modern instrumental
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
age,null,95% confidence interval lower bound,calendar year before present,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
age,null,null,calendar year before present,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
strontium/calcium,Porites sp.,null,null,null,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
strontium/calcium,Porites sp.,two standard error,null,null,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
notes,null,null,null,null,corals and sclerosponges,null,null,C,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
age,null,95% confidence interval upper bound,calendar year before present,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
trace metals
geoscientificInformation
Interglacial
Sea Surface Temperature Reconstruction
Warm Pool
7244 cal yr BP
6794 cal yr BP
Complete
-.13
-.13
98.52
98.52
-6
-6
Ocean
Indian Ocean
Indonesia
Mentawai>LATITUDE -.13>LONGITUDE 98.52
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
Abram, N.J., H.V. McGregor, M.K. Gagan, W.S. Hantoro,
and B.W. Suwargadi. 2009.
Oscillations in the southern extent of the Indo-Pacific
Warm Pool during the mid-Holocene.
Quaternary Science Reviews, Vol. 28, pp. 2794-2803.
doi:10.1016/j.quascirev.2009.07.006
The Indo-Pacific Warm Pool (IPWP) is thought to play a key role
in the propagation and amplification of climate changes through
its influence on the global distribution of heat and water vapour.
However, little is known about past changes in the size and position
of the IPWP. In this study, we use a total of 48 modern and fossil
coral records from the Mentawai Islands (Sumatra, Indonesia) and
Muschu/Koil Islands (Papua New Guinea) to reconstruct oscillations
in the extent of the IPWP since the mid-Holocene. We show that
reliable estimates of mean sea surface temperature (SST) can be
obtained from fossil corals by using low-resolution Sr/Ca analysis
of a suite of corals to overcome the large uncertainties associated
with mean Sr/Ca-SST estimates from individual coral colonies.
The coral records indicate that the southeastern and southwestern
margins of the IPWP were cooler than at present between ~5500 and
4300 years BP (~1.2°C ± 0.3°C) and were similarly cool before
~6800 years BP. This mid-Holocene cooling was punctuated by an abrupt,
short-lived shift to mean SSTs that were warmer than at present
between ~6600 and 6300 years BP (~1.3°C ± 0.3°C), while similarly
warm conditions may have also existed after ~4300 years BP.
We suggest that mid-Holocene cooling at our study sites was related
to contractions of the southeastern and southwestern margins of the
IPWP, associated with the more northerly position of the Inter-tropical
Convergence Zone (ITCZ) that accompanied mid-Holocene strengthening
of the Asian summer monsoon. Conversely, intervals of abrupt warming
appear to correspond with widespread episodes of monsoon weakening
and accompanying southward migrations of the ITCZ that caused the
IPWP to expand beyond our coral sites. Intervals of a strengthened
Asian monsoon and cooling in the southwestern IPWP during the
mid-Holocene appear to correspond with a more positive Indian Ocean
Dipole (IOD)-like mean configuration across the tropical Indian Ocean,
suggesting that the Asian monsoon-IOD interaction that exists at
interannual time scales also persists over centennial to millennial
scales. Associated mean changes in the Pacific ENSO modes may have
also occurred during the mid-Holocene. The dynamic and inter-connected
behaviour of the IPWP with tropical climate systems during the
mid-Holocene highlights the fundamental importance of the warm pool
region for understanding climate change throughout the tropics
and beyond.
STUDY NOTES: Mid-Holocene sea surface temperature reconstructions for the
Indo-Pacific Warm Pool region based on fossil coral Sr/Ca ratios.
All coral ages are given in years before present (yBP) notation,
where present is 1950 AD. Modern coral ages are absolute, based
on drilling date and comparison with instrumental records,
and are expressed in years before present notation for consistency
with the fossil coral data.
Fossil coral age determinations were made using calibrated
radiocarbon measurements (2s age range) for the Mentawai corals
and U/Th measurements for the Muschu/Koil corals (±2s error).
2 standard error on mean Sr/Ca determinations are derived from
the average of yearly or composite resolution Sr/Ca measurements,
or of the average of triplicate Sr/Ca measurements of bulk coral
powders.
The mean Sr/Ca values were converted to SST anomalies relative to
the mean Sr/Ca value obtained from the modern corals for each
locality using a mean Sr/Ca-SST dependence of -0.061 mmol mol-1 °C-1
(Abram et al. 2007, Correge et al. 2006). The error on the
reconstructed SST anomaly is a combined error based on the
standard error on the mean fossil Sr/Ca determinations and the
standard deviation around the reconstruction of modern SST from
the modern coral samples at each locality.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/abram2009ipwp-sst.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/abram2009ipwp-sst.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11