{"id":36033,"date":"2025-04-14T09:29:12","date_gmt":"2025-04-14T01:29:12","guid":{"rendered":"https:\/\/www.oc.ntu.edu.tw\/?p=36033"},"modified":"2025-04-14T09:30:32","modified_gmt":"2025-04-14T01:30:32","slug":"diatom-culturing-experiments-reveal-the-mystery-of-barium-isotopes-in-pelagic-barite","status":"publish","type":"post","link":"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/36033\/","title":{"rendered":"Diatom culturing experiments reveal the mystery of barium isotopes in pelagic barite"},"content":{"rendered":"\n

Have you ever wondered how tiny ocean organisms influence the chemistry of seawater? Dr. Yu-Te Alan Hsieh and his masters student Po-Kai Yang from IONTU, in collaboration with Prof. Tung-Yuan Ho from Academia Sinica, explore this question by examining barium (Ba) and their isotopes – valuable tracers for understanding past and present ocean productivity and carbon export. Specifically, this study investigated how diatoms may impact Ba isotope fractionation during the formation of pelagic barite.<\/p>\n\n\n\n

Barium forms a mineral called barite (BaSO\u2084) in pelagic particulate microenvironments as organic particles decay and sink into the deep ocean. Scientists analyze barite and its chemical records to reconstruct past ocean productivity and marine chemistry. However, one mystery remains: why does pelagic barite show more negative Ba isotope fractionation than lab-precipitated barite?<\/p>\n\n\n\n

To solve this puzzle, the research team turned to diatoms, a type of phytoplankton that plays a key role in the marine carbon cycle. These microscopic organisms take up Ba while they grow, but their influence on Ba isotopes has remained unclear.<\/p>\n\n\n\n

This study conducted a series of culturing experiments using the model marine diatom Thalassiosira weissflogii<\/em> to explore how diatoms take up Ba from seawater and how this process affects its isotopic composition. The results revealed that:<\/p>\n\n\n\n

    \n
  1. Diatoms passively take up Ba through Ca transporters, with uptake rates influenced by growth conditions but independent of Ba isotope fractionation.<\/li>\n\n\n\n
  2. Ba\/C ratios in cultured diatoms are significantly lower than those in marine particles, suggesting that biological uptake alone cannot explain the observed Ba flux, requiring additional sources such as\u00a0microbial processes.<\/li>\n\n\n\n
  3. Diatoms preferentially take up isotopically lighter Ba, providing the first direct evidence of Ba isotope fractionation in organic-associated Ba before the formation of pelagic barite. This explains why pelagic barite shows more negative Ba isotope fractionation than lab-precipitated barite.<\/li>\n<\/ol>\n\n\n\n

    This research sheds new light on\u00a0how marine life interacts with chemical elements and their isotope compositions in the ocean, which is crucial for future studies using\u00a0Ba isotopes to reconstruct past ocean productivity and marine chemistry.<\/p>\n\n\n\n

    Hsieh, Y.-T., Yang, P.-K., Ho, T.-Y., 2025, Barium uptake and isotope fractionation by a marine diatom: Implications for oceanic barium cycle. Geochimica et Cosmochimica Acta 395, 238-247. https:\/\/doi.org\/10.1016\/j.gca.2025.03.006<\/a><\/p>\n\n\n\n

    \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

    Have you ever wondered how tiny ocean organisms influence the chemistry of seawater? Dr. Yu-Te Alan Hsieh and his masters student Po-Kai Yang from IONTU, in collaboration with Prof. Tung-Yuan Ho from Academia Sinica, explore this question by examining barium (Ba) and their isotopes – valuable tracers for understanding past and present ocean productivity and carbon […]<\/p>\n","protected":false},"author":19,"featured_media":36031,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[95,119],"tags":[],"class_list":["post-36033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en","category-research-highlights"],"acf":[],"yoast_head":"\nDiatom culturing experiments reveal the mystery of barium isotopes in pelagic barite - Institute of Oceanography, NTU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/36033\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diatom culturing experiments reveal the mystery of barium isotopes in pelagic barite - Institute of Oceanography, NTU\" \/>\n<meta property=\"og:description\" content=\"Have you ever wondered how tiny ocean organisms influence the chemistry of seawater? 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