210Pb and AMS radiocarbon dates of sediment cores JM99-1197 and JM02-59 obtained in Malangen


Autoria(s): Hald, Morten; Salomonsen, Gaute R; Husum, Katrine; Wilson, Laurie J
Cobertura

LATITUDE: 69.494330 * LONGITUDE: 18.382000 * DATE/TIME START: 1999-11-26T23:07:00 * DATE/TIME END: 1999-11-26T23:07:00

Data(s)

22/04/2011

Resumo

A high-resolution sedimentary record from the subarctic Malangen fjord in northern Norway, northeastern North Atlantic has been investigated in order to reconstruct variations in influx of Atlantic Water for the last 2000 years. The fjord provides a regional oceanographic climatic signal reflecting changes in the North Atlantic heat flux at this latitude because of its deep sill and the relatively narrow adjoining continental shelf. The reconstructions are based on oxygen and carbon isotopic studies of benthic foraminifera from a high accumulation basin in the Malangen fjord, providing subdecadal time resolution. A comparison between instrumental measurements of bottom water temperatures at the core location and the reconstructed temperatures from benthic foraminiferal d18O for the same time period demonstrates that the stable isotope values reflect the bottom water temperatures very well. The reconstructed temperature record shows an overall decline in temperature of c. 1°C from c. 40 BC to ad 1350. This cooling trend is assumed to be driven by an orbital forced reduction in insolation. Superimposed on the general cooling trend are several periods of warmer or colder temperatures. The long-term fluctuations in the Malangen fjord are concurrent with fluctuations of Atlantic Water in the northern North Atlantic. Although they are not directly comparable, comparisons of atmospheric temperatures and marine records, indicate a close coupling between the climate systems. After ad l800 the record shows an unprecedented warming within the last 2000 years.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.810470

doi:10.1594/PANGAEA.810470

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Hald, Morten; Salomonsen, Gaute R; Husum, Katrine; Wilson, Laurie J (2011): A 2000 year record of Atlantic Water temperature variability from the Malangen Fjord, northeastern North Atlantic. The Holocene, 21(7), 1049-1059, doi:10.1177/0959683611400457

Palavras-Chave #1 sigma; 2 sigma; Acc rate; Accumulation rate per year; Age; Age, 14C AMS; Age, 14C calibrated, IntCal04 and MARINE04 (Hughen et al. 2004, Reimer 2004); Age, 210Lead; Age, dated; Age, dated material; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Age dated; Age max; Age min; Age std dev; Calendar years; Cal yrs; Core; d13C; Dated material; delta 13C; Depth; DEPTH, sediment/rock; Event; International Polar Year (2007-2008); IPY; Sample; Sample ID; Section; SECTION, height; Sedimentation rate per year; Sedim rate
Tipo

Dataset