High Pacific native Fallon

Core/Site name:

Langkai Island, Makassar Strait

Country/Region:

Indonesia

Elevation:

-4

Archive:

corals

Species:

Porites lutea

Proxy measurement:

Delta-14C

Sampling resolution:

monthly

Startyear:

1937 AD

Endyear:

1990 AD

Description:

To explore the seasonal to decadal variability in surface water masses that contribute to the Indonesian throughflow, we have generated a 115-year bimonthly coral-based radiocarbon time series from a coral in the Makassar Straits. In the pre-bomb (pre-1955) era from 1890 to 1954, the radiocarbon time series occasionally displays a small seasonal signal (10–15‰). After 1954 the radiocarbon record increases rapidly, in response to the increased atmospheric 14C content caused by nuclear weapons testing. From 1957 to 1986 the record displays clear seasonal variability from 15 to 60‰ and the post-bomb peak (163 per mil) occurred in 1974. The seasonal cycle of radiocarbon can be attributed to variations of surface waters passing through the South Makassar Strait. Southern Makassar is under the influence of the Northwest Monsoon, which is responsible for the high austral summer radiocarbon (North Pacific waters) and the Southeast Monsoon that flushes back a mixture of low (South Pacific and upwelling altered) radiocarbon water from the Banda Sea. The coral record also shows a significant 14C peak in 1955 due to the bomb-14C water advected into this region from nuclear weapons tests in the Marshall Islands in 1954.

Data entered by name:

Paniagua, Juan F.

Data entered by email:

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Main reference(s):

Fallon, S.J. and T.P. Guilderson. 2008. Surface water processes in the Indonesian throughflow as documented by a high-resolution coral D14C record. J. Geophys. Res., 113, C09001, doi:10.1029/2008JC004722

Link to reference 1:

http://www.agu.org/pubs/crossref/2008/2008JC004722.shtml

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:348630013541021::::P1_STUDY_ID:10272

Data storage link 2:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/langkai2008.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k