noaa-coral-1889
Penang Island - Radiocarbon Data
Grumet, N.S.; Abram, N.J.; Beck, J.W.; Dunbar, R.B.; Gagan, M.K.; Guilderson, T.P.; Hantoro, W.S.; Suwargadi, B.W.
Penang Island - Radiocarbon Data
2004-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/1889
Investigator
N.S.
Grumet
Investigator
N.J.
Abram
Investigator
J.W.
Beck
Investigator
R.B.
Dunbar
Investigator
M.K.
Gagan
Investigator
T.P.
Guilderson
Investigator
W.S.
Hantoro
Investigator
B.W.
Suwargadi
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
Delta 14C,Porites sp.,null,per mil NBS oxalic acid,null,corals and sclerosponges,raw,accelerator mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
carbon isotopes
geoscientificInformation
1944 AD
1990 AD
6 cal yr BP
-40 cal yr BP
Complete
-.13
-.13
98.52
98.52
-6
-6
Ocean
Indian Ocean
Indonesia
Penang Island>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
Grumet, N.S., N.J. Abram, J.W. Beck, R.B. Dunbar, M.K. Gagan, T.P. Guilderson, W.S. Hantoro, and B.W. Suwargadi. 2004. Coral radiocarbon records of Indian Ocean water mass mixing and wind-induced upwelling along the coast of Sumatra, Indonesia. Journal of Geophysical Research - Oceans 109:C05003.
Radiocarbon (14C) in the skeletal aragonite of annually banded corals track radiocarbon concentrations in dissolved inorganic carbon (DIC) in surface seawater. As a result of nuclear weapons testing in the 1950s, oceanic uptake of excess 14C in the atmosphere has increased the contrast between surface and deep ocean 14C concentrations. We present accelerator mass spectrometric (AMS) measurements of 14C/12C ratios (d14C) in Porites corals from the Mentawai Islands, Sumatra (0°S, 98°E) and Watamu, Kenya (3°S, 39°E) to document the temporal and spatial evolution of the 14C zonal gradient in the tropical Indian Ocean. The rise in d14C in the Sumatra coral, in response to the maximum in nuclear weapons testing, is delayed by 2ŋ3 years relative to the rise in coral d14C from the coast of Kenya. Kenya coral d14C values rise quickly because surface waters are in prolonged contact with the atmosphere. In contrast, wind-induced upwelling and rapid mixing along the coast of Sumatra entrains 14C-depleted water from the subsurface, which dilutes the effect of the uptake of bomb-produced 14C by the surface ocean. Bimonthly AMS d14C measurements on the Mentawai coral reveal mainly interannual variability with minor seasonal variability. Singular spectrum analysis of the Sumatra coral d14C record reveals a significant 3-year periodicity. These results lend support to the concept that interannual variability in Indian Ocean upwelling and sea surface temperatures is related to ENSO-like teleconnections over the Indo-Pacific basin.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/penang2004.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11