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Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global 18O Record
We propose that from È3 to 1 million years ago, ice volume changes occurred in both the Northern and Southern Hemispheres, each controlled by local summer insolation. Because Earth's orbital precession is out of phase between hemispheres, 23,000-year changes in ice volume in each hemisphere cancel out in globally integrated proxies such as ocean d 18 O or sea level, leaving the in-phase obliquity (41,000 years) component of insolation to dominate those records. Only a modest ice mass change indoi:10.1126/science.1123296 pmid:16794038 fatcat:wfqj57emufeo3lypsuhg4k7c7i