主题:Cenozoic sea ice and climate history of the Arctic Ocean: Milestones from past and future IODP drilling 报告人:Prof. Ruediger Stein Alfred Wegener Institute 时间地点: 报告人简介: The long-term Cenozoic sea ice and climate history of the Arctic Ocean with its transition from a Greenhouse World with a warm ice-free Arctic Ocean to an Icehouse World with a cold ice-covered Arctic Ocean is still poorly known. The paleoclimate results from the first IODP Expedition in the Arctic Ocean (Expedition 302, Arctic Ocean Coring Expedition – ACEX) give important insight into the long-term Arctic climate history. The warm ice-free Arctic Ocean with euxinic conditions during the Eocene and the early onset of seasonal sea ice in the central Arctic Ocean during the middle Eocene might be highlighted. However, major questions related to the climate development of the Arctic Ocean from Greenhouse to Icehouse conditions during early Cenozoic times remain unanswered, largely due to the major mid-Cenozoic hiatus and partly to the poor recovery of the ACEX record. In order to decipher the pre-Quaternary climate (and sea ice) history of the Arctic in more detail, long continuous sedimentary records are planned to be recovered within a new IODP drilling campaign on southern Lomonosov Ridge during IODP Expedition 377 Arctic Ocean Paleoceanography - ArcOP in August-October 2018. 邀请人:汪品先 院士 |