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Our \u03b4<jats:sup>2<\/jats:sup>H<jats:sub>wax<\/jats:sub>results show \u223c60\u2030 variation and evidence for eccentricity and precession forcing. iCESM simulations indicate that changes in the Earth\u2019s orbit drive large seasonal variations in precipitation and \u03b4<jats:sup>2<\/jats:sup>H of precipitation at our study site, primarily during the summer season. Our findings suggest that the astronomical response in \u03b4<jats:sup>2<\/jats:sup>H<jats:sub>wax<\/jats:sub>is attributable to an asymmetrical climate response to the seasonal cycle, a \u201cclipping\u201d of precession forcing, and asymmetric carbon cycle dynamics, which further enhance the influence of eccentricity modulation on the hydrological cycle during the EECO. More broadly, our study provides an explanation for how and why eccentricity emerges as a dominant frequency in climate records from ice-free greenhouse worlds.<\/jats:p>","DOI":"10.1126\/sciadv.adg8022","type":"journal-article","created":{"date-parts":[[2023,8,4]],"date-time":"2023-08-04T17:58:23Z","timestamp":1691171903000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":15,"title":["Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse"],"prefix":"10.1126","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-7629-7070","authenticated-orcid":true,"given":"Andrew P.","family":"Walters","sequence":"first","affiliation":[{"name":"Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9080-9289","authenticated-orcid":true,"given":"Jessica 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