Neogene to Quaternary Central Arctic Ocean dinoflagellate cyst stratigraphy and polar paleoceanography

IODP第302航次（ACEX：北极取芯考察）首次在北极中部常年被冰覆盖的高北方纬度地区进行科学勘探。将建立新第三纪至第四纪沉积物的甲藻孢囊生物地层学，并与磁性地层学进行校准，为孔洞提供基本的年龄控制，并确定可能与欧亚大陆盆地的板块构造和/或古气候发展有关的间断日期。罗蒙诺索夫海岭的沉降。甲藻孢囊和其他水生polynomorphs将进行定量分析，以解开的时间和结构的周期和事件，是全球古气候的意义。海面条件的变化（温度、盐度、海冰覆盖的持续时间）和环北极陆地地区淡水的排放将在某些新第三纪时间片上重建，以确定北冰洋对全球气候变化的响应：最后两个冰期/间冰期旋回，海洋间冰期同位素阶段1，5，11，中更新世革命，上新世中期温暖期和随后的北方半球主要冰川的开始，以及中新世中期的热最佳期。

IODP Leg 302 (ACEX: Arctic Coring Expedition) recovered for the first time in the scientific exploration of the high northern latitudes drill cores from the perennially ice-covered Central Arctic Ocean. A dinoflagellate cyst biostratigraphy of the Neogene to Quaternary sediments will be established and calibrated versus magnetostratigraphy to provide basic age control for the holes and to date hiatuses that are probably related to the plate tectonic and/or paleoclimate development of the Eurasia Basin and the subsidence of Lomonosov Ridge. Dinoflagellate cysts and other aquatic palynomorphs will be analysed quantitatively to unravel the timing and structure of periods and events that are of global paleoclimate significance. The variability of sea-surface conditions (temperature, salinity, duration of sea-ice cover) and the discharge of freshwater from the circum-arctic land areas will be reconstructed for certain Neogene time-slices to identify the response of the Arctic Ocean to global climate change: the last two glacial/ interglacial cycles, the marine interglacial isotope stages 1, 5, 11, the mid-Pleistocene Revolution, the mid-Pliocene warm period and the subsequent inception of major glaciations in the northern hemisphere, and the mid- Miocene thermal optimum.