Freshwater pearl mussels from northern Sweden serve as long-term, high-resolution stream water isotope recorders
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Published:2020-02-17
Issue:2
Volume:24
Page:673-696
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Schöne Bernd R., Meret Aliona E., Baier Sven M., Fiebig Jens, Esper JanORCID, McDonnell Jeffrey, Pfister LaurentORCID
Abstract
Abstract. The stable isotope composition of lacustrine sediments is routinely used to infer Late Holocene changes in precipitation over Scandinavia and, ultimately, atmospheric circulation dynamics in the North Atlantic realm. However, such archives only provide a low temporal resolution (ca. 15 years), precluding the ability to identify changes on inter-annual and quasi-decadal timescales. Here, we present a new, high-resolution reconstruction using shells of freshwater pearl mussels, Margaritifera margaritifera, from three streams in northern Sweden. We present seasonally to annually resolved, calendar-aligned stable oxygen and carbon isotope data from 10 specimens, covering the time interval from 1819 to 1998. The bivalves studied formed their shells near equilibrium with the oxygen isotope signature of ambient water and, thus, reflect hydrological processes in the catchment as well as changes, albeit damped, in the isotope signature of local atmospheric precipitation. The shell oxygen isotopes were significantly correlated with the North Atlantic Oscillation index (up to 56 % explained variability), suggesting that the moisture that winter precipitation formed from originated predominantly in the North Atlantic during NAO+ years but in the Arctic during NAO− years. The isotope signature of winter precipitation was attenuated in the stream water, and this damping effect was eventually recorded by the shells. Shell stable carbon isotope values did not show consistent ontogenetic trends, but rather oscillated around an average that ranged from ca. −12.00 to −13.00 ‰ among the streams studied. Results of this study contribute to an improved understanding of climate dynamics in Scandinavia and the North Atlantic sector and can help to constrain eco-hydrological changes in riverine ecosystems. Moreover, long isotope records of precipitation and streamflow are pivotal to improve our understanding and modeling of hydrological, ecological, biogeochemical and atmospheric processes. Our new approach offers a much higher temporal resolution and superior dating control than data from existing archives.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference77 articles.
1. Andersson, S., Rosqvist, G., Leng, M. J., Wastegard, S., and Blaauw, M.:
Late Holocene climate change in central Sweden inferred from lacustrine
stable isotope data, J. Quaternary Sci., 25, 1305–1316,
https://doi.org/10.1002/jqs.1415, 2010. 2. Araguás-Araguás, L., Froehlich, K., and Rozanski, K.: Deuterium and
oxygen-18 isotope composition of precipitation and atmospheric moisture,
Hydrol. Process., 14, 1341–1355,
https://doi.org/10.1002/1099-1085(20000615)14:8<1341::AID-HYP983>3.0.CO;2-Z, 2000. 3. Baillie, M. G. L. and Pilcher, J. R.: A simple crossdating program for
tree-ring research, Tree-ring Bull., 33, 7–14, 1973. 4. Baldini, L. M., McDermott, F., Foley, A. M., and Baldini, J. U. L.: Spatial
variability in the European winter precipitation δ18O-NAO
relationship: Implications for reconstructing NAO-mode climate variability
in the Holocene, Geophys. Res. Lett., 35, L04709,
https://doi.org/10.1029/2007GL032027, 2008. 5. Beirne, E. C., Wanamaker Jr., A. D., and Feindel, S. C.: Experimental
validation of environmental controls on the δ13C of Arctica islandica (ocean
quahog) shell carbonate, Geochim. Cosmochim. Ac., 84, 395–409,
https://doi.org/10.1016/j.gca.2012.01.021, 2012.
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