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Klitgaard-Kristensen, Dorthe; Sejrup, Hans Petter; Haflidason, Haflidi; Berstad, Ida Malene; Mikalsen, G (2004): (Table 1) Age determination of North Atlantic sediment cores. PANGAEA,, 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,

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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,
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
HM109-04 * Latitude: 62.173300 * Longitude: 5.971700 * Elevation: -694.0 m * Location: Norwegian continental margin * Device: Box corer (BC) * Comment: 0.25
HM122-10 * Latitude: 66.153700 * Longitude: 12.656700 * Elevation: -307.0 m * Location: Norwegian continental margin * Device: Box corer (BC) * Comment: 0.31
P1-003 * Latitude: 63.756700 * Longitude: 5.253300 * Elevation: -851.0 m * Location: Norwegian continental margin * Device: MultiCorer (MUC) * Comment: 0.416
Data of P1-003 from Berstad et al. (2003).
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Area/localityAreaKlitgaard-Kristensen, Dorthe
3DEPTH, sediment/rockDepthmGeocode
4Depth, top/minDepth topmKlitgaard-Kristensen, Dorthe
5Depth, bottom/maxDepth botmKlitgaard-Kristensen, Dorthe
6Age, dated materialDated materialKlitgaard-Kristensen, Dorthe
7Laboratory code/labelLab labelKlitgaard-Kristensen, Dorthe
8Age, datedAge datedkaKlitgaard-Kristensen, DortheAge, 14C conventionalref 1950
9Age, dated standard deviationAge dated std dev±Klitgaard-Kristensen, DortheAge, 14C conventionalref 1950
10Age, datedAge datedkaKlitgaard-Kristensen, DortheAge, 14C milieu/reservoir corrected (-400 yr)
11Age, dated standard deviationAge dated std dev±Klitgaard-Kristensen, DortheAge, 14C milieu/reservoir corrected (-400 yr)
12Calendar yearsCal yrska BPKlitgaard-Kristensen, Dorthe
13Calendar years, standard deviationCal yrs std dev±Klitgaard-Kristensen, Dorthe
55 data points

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