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Diurnal variation in atmospheric CO<jats:sub>2<\/jats:sub> concentration ([CO<jats:sub>2<\/jats:sub>]) can reach 5%\u201315%, yet the extent to which (CO<jats:sub>2<\/jats:sub>) contributes to diurnal GPP variations across biomes and how this contribution varies across climate gradients remain unclear. Here, we used global half\u2010hourly eddy covariance observations to quantify the importance of (CO<jats:sub>2<\/jats:sub>) in driving diurnal GPP variations and investigated the environmental factors influencing this response. On average, the relative contribution of (CO<jats:sub>2<\/jats:sub>) to diurnal GPP variations, calculated through multivariate regression, was 11% across all sites, comparable to the contributions of vapour pressure deficit (13%) and soil moisture (11%). We also observed systematic differences in the contribution of (CO<jats:sub>2<\/jats:sub>) to GPP variability across ecosystems with different plant functional types and climate conditions. Variation in the contribution of (CO<jats:sub>2<\/jats:sub>) to GPP is primarily driven by temperature\u2010related variables. At long\u2010term sites, we identified a significant upward trend in (CO<jats:sub>2<\/jats:sub>) influence on GPP over time, suggesting an increasing role of (CO<jats:sub>2<\/jats:sub>) in explaining GPP variations. This study quantified the importance of (CO<jats:sub>2<\/jats:sub>) to the diurnal variations of GPP across globally distributed ecosystems and highlighted that it makes a significant contribution to diurnal GPP patterns.<\/jats:p>","DOI":"10.1111\/pce.15638","type":"journal-article","created":{"date-parts":[[2025,5,27]],"date-time":"2025-05-27T06:29:04Z","timestamp":1748327344000},"page":"6722-6733","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Contribution of Carbon Dioxide Concentration to the Diurnal Variation in Land Surface Carbon Dioxide Uptake From the Atmosphere"],"prefix":"10.1111","volume":"48","author":[{"given":"Weize","family":"Tang","sequence":"first","affiliation":[{"name":"Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5479-6214","authenticated-orcid":false,"given":"Fangyue","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Water Sciences Beijing Normal University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul C.","family":"Stoy","sequence":"additional","affiliation":[{"name":"Department of Biological Systems Engineering University of Wisconsin\u2010Madison Madison Wisconsin USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Russell L.","family":"Scott","sequence":"additional","affiliation":[{"name":"Southwest Watershed Research Centre USDA Agricultural Research Service Tucson Arizona USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angela Che Ing","family":"Tang","sequence":"additional","affiliation":[{"name":"Department of Environmental Sciences University of Toledo Toledo Ohio USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7627-8824","authenticated-orcid":false,"given":"Zheng","family":"Fu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,27]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-1571(71)90091-4"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-017-0519-6_48"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11299"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/gcb.12283"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/sdata.2018.214"},{"key":"e_1_2_9_7_1","unstructured":"Bouvier J. 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