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Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constrained and direct manganese limitation of the marine carbon cycle has been neglected by ocean models. Here, using available observations, we develop a new global biogeochemical model and find that phytoplankton in over half of the Southern Ocean cannot attain maximal growth rates because of manganese deficiency. Manganese limitation is most extensive in austral spring and depends on phytoplankton traits related to the size of photosynthetic antennae and the inhibition of manganese uptake by high zinc concentrations in Antarctic waters. Importantly, manganese limitation expands under the increased iron supply of past glacial periods, reducing the response of the biological carbon pump. Overall, these model experiments describe a mosaic of controls on Southern Ocean productivity that emerge from the interplay of light, iron, manganese and zinc, shaping the evolution of Antarctic phytoplankton since the opening of the Drake Passage.<\/jats:p>","DOI":"10.1029\/2022gb007382","type":"journal-article","created":{"date-parts":[[2022,10,25]],"date-time":"2022-10-25T17:43:25Z","timestamp":1666719805000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean"],"prefix":"10.1029","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5897-0830","authenticated-orcid":false,"given":"Nicholas J.","family":"Hawco","sequence":"first","affiliation":[{"name":"Department of Oceanography University of Hawai\u02bbi at M\u0101noa  Honolulu HI 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