/* DATA DESCRIPTION: Citation: Klitgaard-Kristensen, Dorthe; Sejrup, Hans Petter; Haflidason, Haflidi; Berstad, Ida Malene; Mikalsen, G (2004): (Table 1) Age determination of North Atlantic sediment cores. PANGAEA, https://doi.org/10.1594/PANGAEA.839401, Supplement to: Klitgaard-Kristensen, D et al. (2004): Eight-hundred-year temperature variability from the Norwegian continental margin and the North Atlantic thermohaline circulation. Paleoceanography, 19(2), PA2007, https://doi.org/10.1029/2003PA000960 Abstract: Four cores raised from the eastern Norwegian Sea and adjacent Norwegian fjords at sites influenced by Atlantic water have been investigated. Oxygen isotope analyses in benthic and planktonic foraminifera are used as a proxy for the paleotemperature development spanning the last 800 years. The cores have been dated using a combination of 210Pb and radiocarbon dates yielding time resolutions of 2-5 years for the last century and 9-25 years beyond this. The proxy records have been compared with instrumental time series covering the last 100 years in order to validate the oxygen isotope measurements as a proxy for paleotemperature. The comparison shows that the paleotemperature variability derived from the oxygen isotope analyses is generally similar to the amplitudes and trends seen in the instrumental time series. In particular, a cooling around 1905-1925 followed by a warming until 1955 is evident in all proxy records as well as in the instrumental time series. Beyond the last century the proxy records show two periods from ~1225-1450 and ~1650-1905(25) when temperatures were 1.3-1.6°C lower than present separated by a period of temperatures periodically comparable to present. The last 80 years represent the modern warming and appear to be the warmest period of the last 800 years. We find that that the ocean temperature variability is comparable to terrestrial reconstructions from the region implying a strong link in the ocean-atmosphere climate system. This suggests that the climate variability in this region beyond the period covered by instrumental time series was also associated with changes in the thermohaline circulation. Related to: Berstad, Ida Malene; Sejrup, Hans Petter; Klitgaard-Kristensen, Dorthe; Haflidason, Haflidi (2003): Variability in temperature and geometry of the Norwegian Current over the past 600 yr; stable isotope and grain size evidence from the Norwegian margin. Journal of Quaternary Science, 18(7), 591-602, https://doi.org/10.1002/jqs.790 Coverage: MEDIAN LATITUDE: 64.027900 * MEDIAN LONGITUDE: 7.960567 * SOUTH-BOUND LATITUDE: 62.173300 * WEST-BOUND LONGITUDE: 5.253300 * NORTH-BOUND LATITUDE: 66.153700 * EAST-BOUND LONGITUDE: 12.656700 MINIMUM DEPTH, sediment/rock: 0.1925 m * MAXIMUM DEPTH, sediment/rock: 0.3980 m Event(s): HM109-04 * LATITUDE: 62.173300 * LONGITUDE: 5.971700 * ELEVATION: -694.0 m * LOCATION: Norwegian continental margin * METHOD/DEVICE: Box corer (BC) (URI: http://en.wikipedia.org/wiki/Box_corer) * COMMENT: 0.25 HM122-10 * LATITUDE: 66.153700 * LONGITUDE: 12.656700 * ELEVATION: -307.0 m * LOCATION: Norwegian continental margin * METHOD/DEVICE: Box corer (BC) (URI: http://en.wikipedia.org/wiki/Box_corer) * COMMENT: 0.31 P1-003 * LATITUDE: 63.756700 * LONGITUDE: 5.253300 * ELEVATION: -851.0 m * LOCATION: Norwegian continental margin * METHOD/DEVICE: MultiCorer (MUC) * COMMENT: 0.416 Comment: Data of P1-003 from Berstad et al. (2003). Parameter(s): Event label (Event) Area/locality (Area) * PI: Klitgaard-Kristensen, Dorthe DEPTH, sediment/rock [m] (Depth sed) * GEOCODE Depth, top/min [m] (Depth top) * PI: Klitgaard-Kristensen, Dorthe Depth, bottom/max [m] (Depth bot) * PI: Klitgaard-Kristensen, Dorthe Age, dated material (Dated material) * PI: Klitgaard-Kristensen, Dorthe Laboratory code/label (Lab label) * PI: Klitgaard-Kristensen, Dorthe Age, dated [ka] (Age dated) * PI: Klitgaard-Kristensen, Dorthe * METHOD/DEVICE: Age, 14C conventional * COMMENT: ref 1950 Age, dated standard deviation [±] (Age dated std dev) * PI: Klitgaard-Kristensen, Dorthe * METHOD/DEVICE: Age, 14C conventional * COMMENT: ref 1950 Age, dated [ka] (Age dated) * PI: Klitgaard-Kristensen, Dorthe * METHOD/DEVICE: Age, 14C milieu/reservoir corrected (-400 yr) Age, dated standard deviation [±] (Age dated std dev) * PI: Klitgaard-Kristensen, Dorthe * METHOD/DEVICE: Age, 14C milieu/reservoir corrected (-400 yr) Calendar age [ka BP] (Cal age) * PI: Klitgaard-Kristensen, Dorthe Calendar age, standard deviation [±] (Cal age std dev) * PI: Klitgaard-Kristensen, Dorthe License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 55 data points */ Event Area Depth sed [m] Depth top [m] Depth bot [m] Dated material Lab label Age dated [ka] (ref 1950, Age, 14C conventional) Age dated std dev [±] (ref 1950, Age, 14C conventional) Age dated [ka] (Age, 14C milieu/reservoir cor...) Age dated std dev [±] (Age, 14C milieu/reservoir cor...) Cal age [ka BP] Cal age std dev [±] HM109-04 Voldafjorden 0.2375 0.235 0.240 foraminifera ETH-23599 0.575 0.080 0.175 0.080 1.283 1.468 HM122-10 Ranafjorden 0.1925 0.190 0.195 Bolivina skagerrakensis Tua-3350 0.680 0.060 0.280 0.060 1.590 1.695 HM122-10 Ranafjorden 0.2925 0.290 0.295 Hyalinea balthica Tua-2824 1.120 0.065 0.320 0.065 1.255 1.340 P1-003 Norwegian margin 0.3005 0.293 0.308 Neogloboquadrina pachyderma (dex) ETH-23213 0.750 0.055 0.350 0.055 1.495 1.644 P1-003 Norwegian margin 0.3980 0.393 0.403 Neogloboquadrina pachyderma (dex) ETH-23214 0.930 0.075 0.530 0.075 1.366 1.470