HIGH-RESOLUTION MG/CA RATIOS IN A CORALLINE RED ALGA AS A PROXY FOR BERING SEA TEMPERATURE VARIATIONS FROM 1902 TO 1967

2009 | journal article. A publication with affiliation to the University of Göttingen.

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​HIGH-RESOLUTION MG/CA RATIOS IN A CORALLINE RED ALGA AS A PROXY FOR BERING SEA TEMPERATURE VARIATIONS FROM 1902 TO 1967​
Hetzinger, S.; Halfar, J.; Kronz, A. ; Steneck, R. S.; Adey, W. H.; Lebednik, P. A. & Schoene, B. R.​ (2009) 
Palaios24(5-6) pp. 406​-412​.​ DOI: https://doi.org/10.2110/palo.2008.p08-116r 

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Authors
Hetzinger, Steffen; Halfar, Jochen; Kronz, Andreas ; Steneck, Robert S.; Adey, Walter H.; Lebednik, Phillip A.; Schoene, Bernd R.
Abstract
We present the first continuous, high-resolution record of Mg/Ca variations within an encrusting coralline red alga, Clathromorphum nereostratum, from Amchitka Island, Aleutian Islands. Mg/Ca ratios of individual growth increments were analyzed by measuring a single-point, electron-microprobe transect, yielding a resolution of similar to 15 samples/year and a 65-year record (1902-1967) of variations. Results show that Mg/Ca ratios in the high-Mg calcite algal framework display pronounced annual cyclicity and archive late spring-late fall sea-surface temperatures (SST) corresponding to the main season of algal growth. Mg/Ca values correlate well to local SST, as well as to an air temperature record from the same region. High spatial correlation to large-scale SST variability in the subarctic North Pacific is observed, with patterns of strongest correlation following the direction of major oceanographic features that play a key role in the exchange of water masses between the North Pacific and the Bering Sea. Our data correlate well with a shorter Mg/Ca record from a second site, corroborating the ability of the alga to reliably record regional environmental signals. In addition, Mg/Ca ratios relate well to a 29-year delta(18)O time series measured on the same sample, providing additional support for the use of Mg in coralline red algae as a paleotemperature proxy that, unlike algal-delta(18)O, is not influenced by salinity fluctuations. Moreover, electron microprobe-based analysis enables higher sampling resolution and faster analysis, thus providing a promising approach for future studies of longer C. nereostratum records and applications to other coralline species.
Issue Date
2009
Status
published
Publisher
Sepm-soc Sedimentary Geology
Journal
Palaios 
ISSN
0883-1351

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