Articles | Volume 20, issue 1
https://doi.org/10.5194/bg-20-229-2023
https://doi.org/10.5194/bg-20-229-2023
Research article
 | 
16 Jan 2023
Research article |  | 16 Jan 2023

Biomarker characterization of the North Water Polynya, Baffin Bay: implications for local sea ice and temperature proxies

David J. Harning, Brooke Holman, Lineke Woelders, Anne E. Jennings, and Julio Sepúlveda

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Cited articles

Amiraux, R., Smik, L., Köseoğlu, D., Rontani, J.-F., Galindo, V., Grondin, P.-L., Babin, M., and Belt, S. T.: Temporal evolution of IP25 and other highly branched isoprenoid lipids in sea ice and the underlying water column during an Arctic melting season, Elementa-Sci. Anthrop., 7, 1–23, https://doi.org/10.1525/elementa.377, 2019. 
Amiraux, R., Archambault, P., Moriceau, B., Lemire, M., Babin, M., Memery, L., Massé, G., and Tremblay, J.-E.: Efficiency of the sympagic-benthic coupling revealed by n-3 fatty acids, IP25 and other highly branched isoprenoid analyses of two filter-feeding Arctic benthic molluscs: Mya truncate and Serripes groenlandicus, Org. Geochem., 151, 104160, https://doi.org/10.1016/j.orggeochem.2020.104160, 2021. 
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Azetsu-Scott, K., Clarke, A., Falkner, K., Hamilton, J., Jones, P. E., Lee, C., Petrie, B., Prinsenberg, S., Starr, M., and Yeats, P.: Calcium carbonate saturation states in the waters of the Canadian Arctic Archipelago and the Labrador Sea, J. Geophys. Res., 115, 1–18, https://doi.org/10.1029/2009JC005917, 2010. 
Bale, N. J., Palatinszky, M., Rijpstra, W. I. C., Herbold, C. W., Wagner, M., and Sinninghe Damsté, J. S.: Membrane lipid composition of the moderately thermophilic ammonia-oxidizing archaeon “Candidatus Nitrosotenuis uzonensis” at different growth temperatures, Appl. Environ. Microbiol., 85, e01332, https://doi.org/10.1128/AEM.01332-19, 2019. 
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Short summary
In order to better reconstruct the geologic history of the North Water Polynya, we provide modern validations and calibrations of lipid biomarker proxies in Baffin Bay. We find that sterols, rather than HBIs, most accurately capture the current extent of the North Water Polynya and will be a valuable tool to reconstruct its past presence or absence. Our local temperature calibrations for GDGTs and OH-GDGTs reduce the uncertainty present in global temperature calibrations.
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