{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T22:15:45Z","timestamp":1785363345846,"version":"3.55.0"},"reference-count":64,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"21","content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Sci. Adv."],"published-print":{"date-parts":[[2026,5,22]]},"abstract":"<jats:p>\n                    Seawater intrusion poses a major threat to freshwater resources in coastal aquifers worldwide. In China alone, these types of aquifers provide a vital groundwater source for nearly 400 million people. Whereas modern seawater intrusion is often attributed to human activities and climate change, the role of paleo\u2013salt water remains poorly quantified. This continental-scale investigation of seawater intrusion in China reveals that paleo\u2013salt water, not modern seawater, dominates salinity patterns in large sedimentary basins. Analysis of over 2100 water samples shows a strong correlation between intrusion and tectonic subsidence zones, with paleo\u2013salt water affecting 66% of the observed salinized areas. In northern coastal plains, paleo\u2013salt water trapped in confined aquifers is characterized by salinity levels exceeding 144.6 grams per liter, whereas modern seawater intrusion (34%) occurs in hilly regions with thinner sediments. Isotopic signatures (\u03b4\n                    <jats:sup>18<\/jats:sup>\n                    O) trace paleo\u2013salt water intrusion to Quaternary sea level changes. These findings improve seawater intrusion source identification and inform global salinity management.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.ady2322","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T18:00:40Z","timestamp":1779300040000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Paleo\u2013salt water dominates coastal aquifer salinization: A continental-scale study in China"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8948-064X","authenticated-orcid":true,"given":"Tianyuan","family":"Zheng","sequence":"first","affiliation":[{"name":"College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, P. R. China."},{"name":"Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, P. R. 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