noaa-coral-10425
Great Barrier Reef Coral 200 Year d11B and pH Reconstruction
Wei, G.; McCulloch, M.T.; Mortimer, G.; Deng, W.; Xie, L.
Great Barrier Reef Coral 200 Year d11B and pH Reconstruction
2010-06-04
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10425
Investigator
G.
Wei
Investigator
M.T.
McCulloch
Investigator
G.
Mortimer
Investigator
W.
Deng
Investigator
L.
Xie
earth science
paleoclimate
corals and sclerosponges
sample identification,null,null,null,null,corals and sclerosponges,null,null,C,null
earth science
paleoclimate
corals and sclerosponges
delta 11B,Porites sp.,null,per mil SRM 951,null,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
delta 11B,Porites sp.,two standard deviations,per mil SRM 951,null,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
delta 13C,Porites sp.,null,per mil VPDB,null,corals and sclerosponges,averaged,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
pH,delta 11B|sea water,null,dimensionless,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
pH,delta 11B|sea water,two standard deviations,dimensionless,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
strontium/calcium,Porites sp.,null,millimole per mole,null,corals and sclerosponges,averaged,inductively-coupled plasma atomic emission spectroscopy,N,null
earth science
paleoclimate
climate reconstructions|corals and sclerosponges
age,null,null,year Common Era,null,climate reconstructions|corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
magnesium/calcium,Porites sp.,null,millimole per mole,null,corals and sclerosponges,averaged,inductively-coupled plasma atomic emission spectroscopy,N,null
earth science
paleoclimate
corals and sclerosponges
barium/calcium,Porites sp.,null,micromole per mole,null,corals and sclerosponges,averaged,inductively-coupled plasma atomic emission spectroscopy,N,null
earth science
paleoclimate
corals and sclerosponges
delta 18O,Porites sp.,null,per mil VPDB,null,corals and sclerosponges,averaged,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
chemistry
geoscientificInformation
Other Hydroclimate Reconstruction
PAGES 2k Network
PAGES Australasia 2k
ocean acidification
1807 AD
2004 AD
143 cal yr BP
-54 cal yr BP
Complete
-16.7167
-16.7167
146.0333
146.0333
Ocean
Pacific Ocean
Western Pacific Ocean
Arlington Reef>LATITUDE -16.7167>LONGITUDE 146.0333
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
Wei, G., M.T. McCulloch, G. Mortimer, W. Deng, and L. Xie. 2009.
Evidence for ocean acidification in the Great Barrier Reef
of Australia.
Geochimica et Cosmochimica Acta, vol. 73, pp. 2332-2346.
doi:10.1016/j.gca.2009.02.009
Geochemical records preserved in the long-lived carbonate skeleton
of corals provide one of the few means to reconstruct changes in
seawater pH since the commencement of the industrial era. This
information is important in not only determining the response of
the surface oceans to ocean acidification from enhanced uptake of
CO2, but also to better understand the effects of ocean acidification
on carbonate secreting organisms such as corals, whose ability to
calcify is highly pH dependent. Here we report an ~200 year d11B
isotopic record, extracted from a long-lived Porites coral from
the central Great Barrier Reef of Australia. This record covering
the period from 1800 to 2004 was sampled at yearly increments from
1940 to the present and 5-year increments prior to 1940. The d11B
isotopic compositions reflect variations in seawater pH, and the
d13C changes in the carbon composition of surface water due to
fossil fuel burning over this period. In addition complementary
Ba/Ca, d18O and Mg/Ca data was obtained providing proxies for
terrestrial runoff, salinity and temperature changes over the
past 200 years in this region. Positive thermal ionization mass
spectrometry (PTIMS) method was utilized in order to enable the
highest precision and most accurate measurements of d11B values.
The internal precision and reproducibility for d11B of our
measurements are better than ±0.2 per mil (2 sigma), which translates
to a precision of better than ±0.02 pH units. Our results indicate
that the long-term pre-industrial variation of seawater pH in this
region is partially related to the decadal-interdecadal variability
of atmospheric and oceanic anomalies in the Pacific. In the periods
around 1940 and 1998 there are also rapid oscillations in d11B
compositions equivalent changes in pH of almost 0.5 U. The 1998
oscillation is co-incident with a major coral bleaching event
indicating the sensitivity of skeletal d11B compositions to loss
of zooxanthellate symbionts. Importantly, from the 1940s to the
present-day, there is a general overall trend of ocean acidification
with pH decreasing by about 0.2-0.3 U, the range being dependent on
the value assumed for the fractionation factor alpha(B3-B4) of the
boric acid and borate species in seawater. Correlations of d11B
with d13C during this interval indicate that the increasing trend
towards ocean acidification over the past 60 years in this region
is the result of enhanced dissolution of CO2 in surface waters from
the rapidly increasing levels of atmospheric CO2, mainly from fossil
fuel burning. This suggests that the increased levels of
anthropogenic CO2 in atmosphere has already caused a significant
trend towards acidification in the oceans during the past decades.
Observations of surprisingly large decreases in pH across important
carbonate producing regions, such as the Great Barrier Reef of
Australia, raise serious concerns about the impact of Greenhouse
gas emissions on coral calcification.
STUDY NOTES: 200 year coral geochemical record and ocean pH reconstruction
from the central Great Barrier Reef of Australia. The Porites sp.
coral core was drilled in Arlington Reef, immediately offshore
Cairns in the north-east coast of Australia in November 2004.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/great_barrier/wei2009_noaa.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/great_barrier/arlington2009.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11