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Multicentennial record of Labrador Sea primary productivity and sea-ice variability archived in coralline algal barium

Artikel i vetenskaplig tidskrift
Författare P. Chan
J. Halfar
W. Adey
S. Hetzinger
Thomas Zack
G. W. K. Moore
U. G. Wortmann
B. Williams
A. Hou
Publicerad i Nature Communications
Volym 8
ISSN 2041-1723
Publiceringsår 2017
Publicerad vid Institutionen för geovetenskaper
Språk English Zier jrn , 1993 , journal of physical oceanography , v23 , p659
Länkar doi.org/10.1038/ncomms15543
Ämnesord atlantic multidecadal oscillation, arctic north-atlantic, bering-sea, ocean, temperature, pacific, salinity, plankton, waters, export, Science & Technology - Other Topics, hairs f, 1980, earth and planetary science letters, v49, p528, an lh, 1977, deep-sea research, v24, p613
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Accelerated warming and melting of Arctic sea-ice has been associated with significant increases in phytoplankton productivity in recent years. Here, utilizing a multiproxy approach, we reconstruct an annually resolved record of Labrador Sea productivity related to sea-ice variability in Labrador, Canada that extends well into the Little Ice Age (LIA; 1646 AD). Barium-to-calcium ratios (Ba/Ca) and carbon isotopes (delta C-13) measured in long-lived coralline algae demonstrate significant correlations to both observational and proxy records of sea-ice variability, and show persistent patterns of co-variability broadly consistent with the timing and phasing of the Atlantic Multidecadal Oscillation (AMO). Results indicate reduced productivity in the Subarctic Northwest Atlantic associated with AMO cool phases during the LIA, followed by a step-wise increase from 1910 to present levels-unprecedented in the last 363 years. Increasing phytoplankton productivity is expected to fundamentally alter marine ecosystems as warming and freshening is projected to intensify over the coming century.

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