Lough-na-Shade, Ireland 1000Yr Ostracode Stable Isotope Data Holmes, J.A.; Arrowsmith, C.; Austin, W.E.N.; Boyle, J.; Fisher, E.; Holme, R.; Marshall, J.F.; Oldfield, F.; van der Post, K. Holmes, J.A. Arrowsmith, C. Austin, W.E.N. Boyle, J. Fisher, E. Holme, R. Marshall, J.F. Oldfield, F. van der Post, K. North Atlantic Oscillation decadal resolution westerlies earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,null,N,Candona sp.) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,ostracod,null,per mil VPDB,null,paleolimnology,null,null,N,Candona sp.) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Lough-na-Shade>LATITUDE 54.3504>LONGITUDE -6.6901) A 1000 year long subdecadal-resolution record of carbonate oxygen isotopes (d18Oc) from Lough-na-Shade, Ireland, provides evidence for changing atmospheric circulation over northwest Europe. The total range of d18Oc values (>5‰) is too large to be explained by changes in water temperature. Moreover, good correlation between the lake record and a previously published d18O time series from an Irish speleothem indicates that the changes in oxygen isotopes are best explained by variations in the isotopic composition of precipitation. The amplitude of change during this period is too large to be explained by shifts in condensation temperature. Instead we suggest that there have been changes in vapour source and transport paths connected with shifts in atmospheric circulation. Changes from a source area from further south within the North Atlantic to one further to the north could explain the prominent positive shift in oxygen-isotope values between the early eighteenth and early nineteenth centuries, for example. Our results also demonstrate the value of a 'multiple-archive' approach to deconvolving lake-based carbonate isotope profiles, which are often complex. STUDY NOTES: High-resolution stable isotope data on ostracod shells from Lough-na-Shade, N. Ireland. Samples are mainly Candona candida, but a few are C. neglecta. Lough-na-Shade is a small (0.3 ha surface area), shallow (maximum depth ~3.5 m) lake in Co. Armagh, N Ireland. d18O and d13C on shells of the ostracod Candona sp. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Holmes, J.A. Investigator : Arrowsmith, C. Investigator : Austin, W.E.N. Investigator : Boyle, J. Investigator : Fisher, E. Investigator : Holme, R. Investigator : Marshall, J.F. Investigator : Oldfield, F. Investigator : van der Post, K. 2010-10-28 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9701 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.xls English https://www.ncdc.noaa.gov/paleo/study/9701 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/uk/lough-na-shade2010.xls Holmes, J., C. Arrowsmith, W. Austin, J. Boyle, E. Fisher, R. Holme, J. Marshall, F. Oldfield, and K. van der Post. 2010. Climate and atmospheric circulation changes over the past 1000 years reconstructed from oxygen isotopes in lake-sediment carbonate from Ireland. The Holocene, Vol. 20, No. 7, pp. 1105-1111. DOI: 10.1177/0959683610369504 START YEAR: 958 AD * END YEAR: 1940 AD -6.6901 54.3504 -6.6901 54.3504