Law Dome Ice Core 1,800 Year Oxygen Isotope Data Plummer, C.T.; Curran, M.A.J.; van Ommen, T.D.; Rasmussen, S.O.; Moy, A.D.; Vance, T.; Clausen, H.B.; Vinther, B.M.; Mayewski, P.A. Plummer, C.T. Curran, M.A.J. van Ommen, T.D. Rasmussen, S.O. Moy, A.D. Vance, T. Clausen, H.B. Vinther, B.M. Mayewski, P.A. earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/ice cores (age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core (Law Dome>LATITUDE -66.73>LONGITUDE 112.83) Volcanic eruptions are an important cause of natural climate variability. In order to improve the accuracy of climate models, precise dating and magnitude of the climatic effects of past volcanism are necessary. Here we present a 2000-yr record of Southern Hemisphere volcanism recorded in ice cores from the high accumulation Law Dome site, East Antarctica. The ice cores were analysed for a suite of chemistry signals and are independently dated via annual layer counting, with 11 ambiguous years at 23 BCE, which has presently the lowest error of all published long Antarctic ice cores. Independently dated records are important to avoid circular dating where volcanic signatures are assigned a date from some external information rather than using the date it is found in the ice core. Forty-five volcanic events have been identified using the sulphate chemistry of the Law Dome record. The low dating error and comparison with the NGRIP (North Greenland Ice Core Project) volcanic records (on the GICC05 timescale) suggest Law Dome is the most accurately dated Antarctic volcanic dataset, which will improve the dating of individual volcanic events and potentially allow better correlation between ice core records, leading to improvements in global volcanic forcing datasets. One of the most important volcanic events of the last two millennia is the large 1450s CE event, usually assigned to the eruption of Kuwae, Vanuatu. In this study, we review the evidence surrounding the presently accepted date for this event, and make the case that two separate eruptions have caused confusion in the assignment of this event. Volcanic sulphate deposition estimates are important for modelling the climatic response to eruptions. The largest volcanic sulphate events in our record are dated at 1458 CE (Kuwae?, Vanuatu), 1257 and 422 CE (unidentified). STUDY NOTES: Annual oxygen isotope (d18O) data from the Law Dome ice core, East Antarctica for 173 - 1995 CE. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Plummer, C.T. Investigator : Curran, M.A.J. Investigator : van Ommen, T.D. Investigator : Rasmussen, S.O. Investigator : Moy, A.D. Investigator : Vance, T. Investigator : Clausen, H.B. Investigator : Vinther, B.M. Investigator : Mayewski, P.A. 2017-05-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22476 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2012d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2012d18o.txt English https://www.ncdc.noaa.gov/paleo/study/22476 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law2012d18o.txt C.T. Plummer, M.A.J. Curran, T.D. van Ommen, S.O. Rasmussen, A.D. Moy, T.R. Vance, H.B. Clausen, B.M. Vinther, and P.A. Mayewski2012An independently dated 2000-yr volcanic record from Law Dome, East Antarctica, including a new perspective on the dating of the 1450s CE eruption of Kuwae, VanuatuClimate of the Past861929-194010.5194/cp-8-1929-2012https://www.clim-past.net/8/1929/2012/ START YEAR: 173 AD * END YEAR: 1995 AD 112.83 -66.73 112.83 -66.73