Response of the high-latitude Northern Hemisphere to orbital climate forcing: Evidence from the Nordic Seas

Abstract

Research Article| June 01, 1994 Response of the high-latitude Northern Hemisphere to orbital climate forcing: Evidence from the Nordic Seas Nalân Koç; Nalân Koç 1Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway Search for other works by this author on: GSW Google Scholar Eystein Jansen Eystein Jansen 1Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Nalân Koç 1Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway Eystein Jansen 1Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (6): 523–526. https://doi.org/10.1130/0091-7613(1994)022<0523:ROTHLN>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Nalân Koç, Eystein Jansen; Response of the high-latitude Northern Hemisphere to orbital climate forcing: Evidence from the Nordic Seas. Geology 1994;; 22 (6): 523–526. doi: https://doi.org/10.1130/0091-7613(1994)022<0523:ROTHLN>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Sediment cores from the Nordic (Greenland, Iceland, and Norwegian) seas provide evidence that this area acts as an initial responder to the forcing effect of orbitally driven changes in insolation on the climate system, as postulated by J. Imbrie et al. The δ18O record of the cores documents a widespread initial deglacial signal in the area between 15 and 13 ka, ∼1000 yr before other deglacial signals from other parts of the Northern Hemisphere. An even earlier meltwater event has been dated to 16,090 ±185 yr B.P. north of Iceland, at the initial rise of Northern Hemisphere insolation after the last glacial maximum. During the period with lowered surface salinities, the Nordic seas were still cold. Reconstructions of the surface-water conditions of the area show that, as the summer insolation values of the Northern Hemisphere reached half of maximum values, a sea-ice-free corridor opened along Norway at ∼13.4 ka. Nearly contemporaneous fluctuations of the polar front and the sea-surface temperatures with the insolation changes indicate that the Nordic seas are very sensitive to insolation forcing, especially in regions close to the sea-ice margin. A decrease in sea-surface temperature and an increase in the areal extent of sea-ice cover since 7 ka indicate that the area is currently on the way to glacial conditions, supporting the predictions made earlier by J. Imbrie et al. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.