georefid:2000-031859SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2000-031859<gco:CharacterString>Changes in atmospheric circulation during the latest Paleocene and earliest Eocene epochs and some implications for the global climate regime</gco:CharacterString>1998-01-01publicationgeorefid:2000-031859Rea, David K.University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United StatesauthorColumbia University Press, New York, NY, United StatespublisherdocumentHardcopyIn: Aubry, Marie-Pierre (editor), Lucas, Spencer G. (editor), Berggren, William A. (editor), Late Paleocene-early Eocene climatic and biotic events in the marine and terrestrial records118-123Examination of eolian sediments from deep-sea cores has revealed evidence for a significant reduction in the intensity of atmospheric circulation that occurred over a span of 1-2 my in the temporal vicinity of the Paleocene/Eocene Epoch boundary. Early Eocene winds were much more sluggish than the surprisingly strong winds of the latest Cretaceous Period and Paleocene Epoch, and implicate a significant reduction in the planetary temperature gradient. In a sequence of longer-term changes that occurred over approximately 3 my beginning in the late Paleocene Epoch (from Biochron P4 to P6), the onset of ocean deep-water warming (based on delta (super 18) O data) preceded the beginning of changes in the partitioning of carbon between ocean and sedimentary reservoirs (based on delta (super 13) C data), which preceded the start of a pronounced reduction in wind intensity, which preceded the benthic foraminifera extinction. These four events were spaced roughly one-half to one million years apart. Explanations for this rather drawn-out series of changes, particularly considering the order in which they occur, are not yet fully satisfactory. The introduction to the ocean-atmosphere system of another greenhouse gas, methane, may be more important than previously considered.completedStratigraphyaliphatic hydrocarbonsalkanesC-13/C-12carbonCenozoiccirculationcoresDeep Sea Drilling ProjectDSDP Site 576DSDP Site 577EoceneextinctionForaminiferagreenhouse effecthydrocarbonsInvertebrataIPODisotope ratiosisotopesLeg 86methanemicrofossilsO-18/O-16organic compoundsoxygenpaleoatmospherePaleocenePaleocene-Eocene boundarypaleoclimatologyPaleogeneProtistastable isotopesstratigraphic boundaryTertiarywind transporturn:org.iodp:exp:86urnlargerWorkCitationcampaignurn:org.iodp:exp:86:site:576urnlargerWorkCitationstudyurn:org.iodp:exp:86urnlargerWorkCitationcampaignurn:org.iodp:exp:86:site:577urnlargerWorkCitationstudyurn:org.iodp:exp:86urnlargerWorkCitationcampaignEnglishgeoscientificInformation157.4323164.163332.212132.2632