Cuban coral traces annual hydrologically driven variability in δ234U values since the end of the Little Ice Age

Cuban coral traces annual hydrologically driven variability in δ234U values since the end of the Little Ice Age | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 18 February 2025 V1 Latest version Share on Cuban coral traces annual hydrologically driven variability in δ234U values since the end of the Little Ice Age Authors : Sahra Greve 0000-0002-1030-8362 [email protected] , Norbert Frank , Paolo Montagna 0000-0001-5598-2214 , Carlos M. Alonso-Hernandez , Miguel Gomez-Batista , Eric Douville , and Sophie F Warken 0000-0003-3293-9074 Authors Info & Affiliations https://doi.org/10.22541/au.173990739.96182414/v1 Published Ocean Science Version of record Peer review timeline 266 views 174 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The natural uranium isotope ratio of 234 U/ 238 U in seawater behaves conservatively at basin scale, yet it can be regionally affected by local continental freshwater discharge at decadal to centennial timescales. Here, we analyse annual variations in the 234 U/ 238 U isotope ratio, expressed as ‰-deviation from radioactive equilibrium as δ 234 U, of a coral from Cuba. Over the past 237 years, the mean δ 234 U value of the coral was 145.58 ± 0.1 ‰, which is identical to that of modern open ocean seawater, whereas the average variation over the past century has been ± 3.7 ‰. This moderate variability is, however, significantly greater than the external precision and reproducibility of measurements of ± 0.55 ‰. Moreover, the δ 234 U values coincide inversely with regional precipitation, suggesting excess 234 U contribution from regional freshwater runoff. The most important finding, is a strong increase in annual δ 234 U variability to ± 8,1 ‰ during the end of the Little Ice Age (LIA, 1778–1847). We suggest that the increased δ 234 U dynamics reflect substantial excess 234 U contributions from the Mississippi, far greater variability in the local freshwater fluxes to the Gulf of Mexico, and/or reduced advective currents during the LIA. This study demonstrates that yet unexplored variability in coral δ 234 U records within the presently known range of global seawater δ 234 U may be attributed to local and advected freshwater sources, which opens a new pathway for reconstructing these processes over time; moreover, it places strong constraints on the initial δ 234 U variability of fossil corals in light of ultrahigh-precision 230 Th/U dating. Supplementary Material File (1023377_0_merged_1738917293.pdf) Download 1018.76 KB File (greve, et al. cuban coral xx234u.pdf) Download 1.04 MB File (greve, et al. supplemets.pdf) Download 588.32 KB Information & Authors Information Version history V1 Version 1 18 February 2025 Peer review timeline Published Ocean Science Version of Record 18 May 2026 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords coral freshwater flux hydroclimate little ice age uranium isotopes Authors Affiliations Sahra Greve 0000-0002-1030-8362 [email protected] Institute of Environmental Physics, University of Heidelberg View all articles by this author Norbert Frank Heidelberg University View all articles by this author Paolo Montagna 0000-0001-5598-2214 Institute of Polar Sciences View all articles by this author Carlos M. Alonso-Hernandez IAEA Environment Laboratories View all articles by this author Miguel Gomez-Batista Centro de Estudios Ambientales de Cienfuegos (CEAC) View all articles by this author Eric Douville LSCE Gif/Yvette View all articles by this author Sophie F Warken 0000-0003-3293-9074 Heidelberg University View all articles by this author Funding Information Deutsche Forschungsgemeinschaft 468685637 SPP2299 Deutsche Forschungsgemeinschaft 441832482 Sophie Warken, Norbert Frank Deutsche Forschungsgemeinschaft 247825108 Norbert Frank Metrics & Citations Metrics Article Usage 266 views 174 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Sahra Greve, Norbert Frank, Paolo Montagna, et al. Cuban coral traces annual hydrologically driven variability in δ234U values since the end of the Little Ice Age. Authorea . 18 February 2025. DOI: https://doi.org/10.22541/au.173990739.96182414/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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