Coralline algal Barium as indicator for 20th century northwestern North Atlantic surface ocean freshwater variability.

Hetzinger, Steffen, Halfar, J., Zack, T., Mecking, Jennifer, Kunz, B. E., Jacob, D. E. and Adey, W. H. (2013) Coralline algal Barium as indicator for 20th century northwestern North Atlantic surface ocean freshwater variability. Open Access Scientific Reports, 3 . p. 1761. DOI 10.1038/srep01761.

[img]
Preview
Text
Hetzinger et al. 2013_Scientific Reports_Coralline algal Barium as indicator for 20th century northwestern North Atlantic surface ocean freshwater variability.pdf - Published Version
Available under License Creative Commons: Attribution 3.0.

Download (1468Kb) | Preview

Supplementary data:

Abstract

During the past decades climate and freshwater dynamics in the northwestern North Atlantic have undergone major changes. Large-scale freshening episodes, related to polar freshwater pulses, have had a strong influence on ocean variability in this climatically important region. However, little is known about variability before 1950, mainly due to the lack of long-term high-resolution marine proxy archives. Here we present the first multidecadal-length records of annually resolved Ba/Ca variations from Northwest Atlantic coralline algae. We observe positive relationships between algal Ba/Ca ratios from two Newfoundland sites and salinity observations back to 1950. Both records capture episodical multi-year freshening events during the 20th century. Variability in algal Ba/Ca is sensitive to freshwater-induced changes in upper ocean stratification, which affect the transport of cold, Ba-enriched deep waters onto the shelf (highly stratified equals less Ba/Ca). Algal Ba/Ca ratios therefore may serve as a new resource for reconstructing past surface ocean freshwater changes.

Document Type: Article
Additional Information: WOS:000318242000003
Keywords: coralline algae; Newfoundland; North Atlantic; salinity; freshwater Barium; paleoclimate; freshening; MARGINAL ICE-ZONE; GREAT-BARRIER-REEF; PAST 4 DECADES; NEWFOUNDLAND SHELF; SALINITY VARIABILITY; EQUATORIAL PACIFIC; SEA ICE; CIRCULATION; CLIMATE; FORAMINIFERA
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/srep01761
ISSN: 2045-2322
Date Deposited: 02 May 2013 13:38
Last Modified: 03 Nov 2016 09:40
URI: http://oceanrep.geomar.de/id/eprint/21194

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...