noaa-coral-10808
Mafia Archipelago, Tanzania 17th and 20th Century Diploastrea Coral d18O
Damassa, T.D.; Cole, J.E.; Barnett, H.R.; Ault, T.R.; McClanahan, T.R.
Mafia Archipelago, Tanzania 17th and 20th Century Diploastrea Coral d18O
2011-04-12
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10808
Investigator
T.D.
Damassa
Investigator
J.E.
Cole
Investigator
H.R.
Barnett
Investigator
T.R.
Ault
Investigator
T.R.
McClanahan
earth science
paleoclimate
corals and sclerosponges
delta 18O,Diploastrea heliopora,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
delta 18O,Diploastrea heliopora,null,per mil VPDB,null,corals and sclerosponges,anomalized|interpolated,isotope ratio mass spectrometry,N,anomalized to mean annual cycle
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
oxygen isotopes
geoscientificInformation
ENSO
1622 AD
1998 AD
328 cal yr BP
-48 cal yr BP
Complete
-8.0167
-8.0167
39.5
39.5
-6
-6
Ocean
Indian Ocean
Fungu Mrima Reef>LATITUDE -8.0167>LONGITUDE 39.5
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
Damassa, T.D., J.E. Cole, H.R. Barnett, T.R. Ault,
and T.R. McClanahan. 2006.
Enhanced multidecadal climate variability in the 17th century
from coral isotope records in the western Indian Ocean.
Paleoceanography, 21, PA2016, doi: 10.1029/2005PA001217
The slowly growing coral Diploastrea heliopora affords a novel
opportunity to obtain multicentury records of paleoclimate,
including details of the interannual rhythms associated with
the El Nino-Southern Oscillation (ENSO) system. We examine
climate variability in an ENSO-teleconnected region using
new oxygen isotope records from D. heliopora, spanning most
of the twentieth (1896-1998) and seventeenth (1622-1722)
centuries, from the Mafia archipelago, Tanzania. The modern
record demonstrates coherency with relevant instrumental
and proxy time series, documents twentieth century warming,
and displays significant power at ENSO periodicities.
The seventeenth century record lacks any trend, exhibits
interannual variance comparable to the modern record,
and displays a pronounced interdecadal signal not evident
in the twentieth century that correlates with other tropical
and hemispheric climate records. We find no clear evidence
of solar irradiance influence on interannual variability
in the western Indian Ocean during these intervals,
although the mean sea surface temperature appears to
vary inversely with insolation.
STUDY NOTES: This dataset includes d18O values and anomalies from a coral
that grew in the tropical western Indian Ocean, in Tanzania's
Mafia archipelago. Data span the 20th century at monthly
resolution and the interval of 1622-1721 at bimonthly resolution.
Anomalies were calculated by subtracting the mean value for the
1 or 2 month period as appropriate for dataset resolution.
These data originate from a single colony of Diploastrea heliopora
cored in July 2000 at Fungu Mrima Reef in the Mafia Archipelago
of Tanzania. We slabbed and X-rayed the core and characterized
the growth geometry using SEM. We sampled the columella portion
of the skeleton at 0.25 mm (for the 20th-century) and 0.5 mm
(for the 17th century) depth intervals using a diamond-encrusted
drill bit. We assigned ages to the samples based on density
banding and isotopic seasonality, assuming d18O maxima fell
in August (the coldest month). We estimate the age uncertainty
for the 20th century interval as ~±1yr and for the older interval
at ~±5yr.
Fungu Mrima Reef, Mafia Archipelago, Tanzania
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/damassa2006-new_noaa.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mafia2006.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/damassa2006-old_noaa.txt
USA/NOAA
DIF
Version 9.8.4
2019-03-27
2019-03-27