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

Författare och institution:
S. Hetzinger (-); J. Halfar (-); Thomas Zack (Institutionen för geovetenskaper); J. V. Mecking (-); B. E. Kunz (-); D. E. Jacob (-); W. H. Adey (-)
Publicerad i:
Scientific Reports, 3 s. Article Number: 1761
Artikel, refereegranskad vetenskaplig
Sammanfattning (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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
Postens nummer:
Posten skapad:
2013-06-10 15:07

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