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While we underestimate the ocean carbon sink when mimicking real-world sampling, adding available sailboat data does not substantially improve reconstructions. Nevertheless, increased sampling reveals a stronger carbon sink, particularly between 40\u00b0S and 60\u00b0S. The improvement persists with hypothetical measurement uncertainties, but substantial differences arise depending on whether positive or negative biases are applied to the race track data. While we show that two additional circumnavigations already improve the ocean mean sink estimate, we further highlight the finding that the additional data remain insufficient to correct the overestimated CO\n                    <jats:sub>2<\/jats:sub>\n                    sink trend, calling for continuation of the ongoing data collection.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.adz1502","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T18:58:58Z","timestamp":1767985138000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":3,"title":["Improved air-sea CO\n                    <sub>2<\/sub>\n                    flux estimates from sailboat measurements"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0910-3247","authenticated-orcid":true,"given":"Jacqueline","family":"Behncke","sequence":"first","affiliation":[{"name":"Max Planck Institute for 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