noaa-coral-20346 Double Reef, Guam 60 Year Coral Bomb-Produced Radiocarbon Data Andrews, A.H.; Asami, R.; Iryu, Y.; Kobayashi, D.R.; Camacho, F. Double Reef, Guam 60 Year Coral Bomb-Produced Radiocarbon Data 2016-07-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20346 Investigator A.H. Andrews Investigator R. Asami Investigator Y. Iryu Investigator D.R. Kobayashi Investigator F. Camacho 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 14C,Porites lobata,null,fraction of modern activity,null,corals and sclerosponges,raw,accelerator mass spectrometry,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,null,per mil NBS oxalic acid,null,corals and sclerosponges,differenced,accelerator mass spectrometry,N,difference between A and B samples 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 13C,Porites lobata,null,per mil VPDB,null,corals and sclerosponges,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,null,per mil NBS oxalic acid,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,t-corrected earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,one standard deviation,per mil NBS oxalic acid,null,corals and sclerosponges,raw,accelerator mass spectrometry,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,one standard deviation,per mil NBS oxalic acid,null,corals and sclerosponges,null,accelerator mass spectrometry,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,null,per mil NBS oxalic acid,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,A sample t-corrected earth science paleoclimate corals and sclerosponges Delta 14C,Porites lobata,null,per mil NBS oxalic acid,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,B sample t-corrected earth science paleoclimate corals and sclerosponges carbon isotopes geoscientificInformation 1939 AD 2000 AD 11 cal yr BP -50 cal yr BP Complete 13.598183 13.598183 144.83588 144.83588 -5 -5 Ocean Pacific Ocean Central Pacific Ocean Guam Double Reef>LATITUDE 13.598183>LONGITUDE 144.83588 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. 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 Andrews, A.H., R. Asami, Y. Iryu, D.R. Kobayashi, and F. Camacho 2016 Journal of Geophysical Research: Oceans 121 10.1002/2016JC012043

High-resolution radiocarbon (14C) analyses on a coral core extracted from Guam, a western tropical Pacific island, revealed a series of early bomb-produced 14C spikes. The typical marine bomb 14C signal-phase lagged and attenuated relative to atmospheric records-is present in the coral and is consistent with other regional coral records. However, 14C levels well above what can be attributed to air-sea diffusion alone punctuate this pattern. This anomaly was observed in other Indo-Pacific coral records, but the Guam record is unmatched in magnitude and temporal resolution. The Guam coral D14C record provided three spikes in 1954-55, 1956-57, and 1958-59 that are superimposed on a normal 14C record. Relative to mean pre-bomb levels, the first peak rises an incredible ~700permil and remained elevated for ~1.2 years. A follow up assay with finer resolution increased the peak by ~300permil. Subsequent spikes were less intense with a rise of ~35permil and ~70permil. Each can be linked to thermonuclear testing in the Pacific Proving Grounds at Bikini and Enewetak atolls in Operations Castle (1954), Redwing (1956), and Hardtack I (1958). These 14C signals can be explained by vaporization of coral reef material in the nuclear fireball, coupled with neutron activation of atmospheric nitrogen (14C production), and subsequent absorption of 14CO2 to form particulate carbonates of close-in fallout. The lag time in reaching Guam and other coral records abroad was tied to ocean surface currents and modeling provided validation of 14C arrival observations. STUDY NOTES: Carbon isotope (D14C) data for the past 60 years from a Porites lobata coral core (GD2) collected from Double Reef, Guam. Data are subsampled from original core from Asami et al. (2004, 2005)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/guam2016d14cdup.txt Data File; Double Reef, Guam Coral Repliocate D14C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/guam2016d14c.txt Data File; Double Reef, Guam Coral D14C and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/guam2016d14chighres.txt Data File; Double Reef, Guam Coral High-Resolution Spike D14C Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11