Atlantic Water advection to the eastern Fram Strait – multiproxy evidence for late Holocene variability.

Werner, Kirstin, Spielhagen, Robert F., Bauch, Dorothea , Hass, H. Christian, Kandiano, Evgeniya and Zamelczyk, Katarzyna (2011) Atlantic Water advection to the eastern Fram Strait – multiproxy evidence for late Holocene variability. Palaeogeography Palaeoclimatology Palaeoecology, 308 (3-4). pp. 264-276. DOI 10.1016/j.palaeo.2011.05.030.

[img]
Preview
Text (Preprint)
Werner.pdf - Accepted Version

Download (582Kb)
[img] Text
2011_Werner_etal_P3.pdf - Published Version
Restricted to Registered users only

Download (956Kb) | Contact

Supplementary data:

Abstract

A multiproxy data set of an AMS radiocarbon dated 46 cm long sediment core from the continental margin off western Svalbard reveals multidecadal climatic variability during the past two millennia. Investigation of planktic and benthic stable isotopes, planktic foraminiferal fauna, and lithogenic parameters aims to unveil the Atlantic Water advection to the eastern Fram Strait by intensity, temperatures, and salinities. Atlantic Water has been continuously present at the site over the last 2,000 years. Superimposed on the increase in sea ice/icebergs, a strengthened intensity of Atlantic Water inflow and seasonal ice-free conditions were detected at ~ 1000 to 1200 AD, during the well-known Medieval Climate Anomaly (MCA). However, temperatures of the MCA never exceeded those of the 20th century. Since ~ 1400 AD significantly higher portions of ice rafted debris and high planktic foraminifer fluxes suggest that the site was located in the region of a seasonal highly fluctuating sea ice margin. A sharp reduction in planktic foraminifer fluxes around 800 AD and after 1730 AD indicates cool summer conditions with major influence of sea ice/icebergs. High amounts of the subpolar planktic foraminifer species Turborotalia quinqueloba in size fraction 150–250 μm indicate strengthened Atlantic Water inflow to the eastern Fram Strait already after ~ 1860 AD. Nevertheless surface conditions stayed cold well into the 20th century indicated by low planktic foraminiferal fluxes. Most likely at the beginning of the 20th century, cold conditions of the terminating Little Ice Age period persisted at the surface whereas warm and saline Atlantic Water already strengthened, hereby subsiding below the cold upper mixed layer. Surface sediments with high abundances of subpolar planktic foraminifers indicate a strong inflow of Atlantic Water providing seasonal ice-free conditions in the eastern Fram Strait during the last few decades.

Document Type: Article
Keywords: Paleoceanography; Late Holocene; Fram Strait; Atlantic Water; multiproxy; stable oxygen and carbon isotopes; planktic foraminifers
Research affiliation: AWI
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.palaeo.2011.05.030
ISSN: 0031-0182
Date Deposited: 30 May 2011 07:46
Last Modified: 08 Jul 2019 11:06
URI: http://oceanrep.geomar.de/id/eprint/11885

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...