Hercules Nèvé, Antarctica 220 Year Ice Core d18O and Accumulation Data Stenni, B.; Caprioli, R.; Cimino, L.; Cremisini, C.; Flora, O.; Gragnani, R.; Longinelli, A.; Maggi, V.; Torcini, S. Stenni, B. Caprioli, R. Cimino, L. Cremisini, C. Flora, O. Gragnani, R. Longinelli, A. Maggi, V. Torcini, S. earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,uncertainty 0.05 per mil) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,kilogram per square meter per year,null,ice cores,null,null,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 earth science/paleoclimate/ice core (Hercules Névé>LATITUDE -73.1>LONGITUDE 165.4) A 42.2 m firn core was collected at the Hercules Nèvé Plateau (100 km inland and 2960 m a.s.l.) in Northern Victoria Land, during the 1994-95 Italian Antarctic Expedition. Chemical (Cl-, NO3-, SO4-2 and H2O2) and isotope (d18O) analyses were performed to evaluate the snow-accumulation rate at this site. Tritium measurements were performed in the upper part of the core in order to narrow down the dating of the core. High nss SO4-2 concentrations seem to be related to some explosive volcanic eruptions, such as Tambora (1815) and the preceding event called "Unknown" (A.D. 1809), Coseguina (A.D. 1835), Makjan (A.D. 1861), Krakatoa (A.D. 1883) and Tarawera (A.D. 1886). A comparison between the seasonal variations observed in the isotope and chemical profiles was carried out in order to reduce the dating uncertainty, using the tritium and the volcanic markers as time constraints. A deposition period of 222 years was thus determined. The 3 year smoothed d18O profile shows more negative values from the bottom of the core (dated A.D. 1770) throughout all the 19th century, suggesting 'cooler' conditions in agreement with other East Antarctic ice-core records. Subsequently, a general increase in d18O values is observed. The calculated average snow-accumulation rates between the above-mentioned time markers are 111-129 kg m-2 a-1. STUDY NOTES: Herlules Névé, Antarctica ice core d18O and accumulation data for the past 220 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Stenni, B. Investigator : Caprioli, R. Investigator : Cimino, L. Investigator : Cremisini, C. Investigator : Flora, O. Investigator : Gragnani, R. Investigator : Longinelli, A. Investigator : Maggi, V. Investigator : Torcini, S. 2017-07-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22401 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999d18o.txt English https://www.ncdc.noaa.gov/paleo/study/22401 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/hercules/hercules1999d18o.txt B. Stenni, R. Caprioli, L. Cimino, C. Cremisini, O. Flora, R. Gragnani, A. Longinelli, V. Maggi and S. Torcini1999200 years of isotope and chemical records in a firn core from Hercules Névé, northern Victoria Land, AntarcticaAnnals of Glaciology29106-112https://www.igsoc.org/annals/29/ START YEAR: 1770 AD * END YEAR: 1992 AD 165.4 -73.1 165.4 -73.1