Collaborative Research: Paleoceanographic constraints on the warming Arctic Ocean

这个多调查员，合作项目的目标是评估和表征海冰和水文条件期间的温暖，低冰条件下，在北极中部的基础上，多代理调查第四纪沉积物岩心恢复在海利奥登跨北极考察？05（HOTRAX？05）。将使用古生物学、化学和沉积学代用指标（微化石成分、稳定同位素、微量/微量元素、Nd同位素等）以及冰筏碎片来源，如氧化铁颗粒指纹。年龄模型将受到几个独立的年代地层学技术（14 C，氨基酸消旋，磁性和生物地层学），并与可靠的第四纪地层学，主要是ACEX和LOMROG核心的相关性。结果将提供（1）过去温暖条件对北冰洋系统的影响的第一次北极范围的评估和长期（约10年）。150 kyr）在北极气候变化的背景下，（2）在北极气候建模和预测北冰洋未来状态急需的边界条件的显着改善。更广泛的影响包括（1）一名博士后的参与，三名研究生和几名本科生，（2）在会议上介绍结果和发表论文，（3）一个网站，将包括3-D可视化，（4）K-12教师和学生的推广，（5）多研究员，国际合作，（6）对北极环境变化研究的古气候组成部分的贡献。

The goal of this multi-investigator, collaborative project is to evaluate and characterize sea ice and hydrographic conditions during periods of warm, low ice conditions in the central Arctic based on a multi-proxy investigation of Quaternary sediment cores recovered during the Healy-Oden Trans-Arctic Expedition?05 (HOTRAX?05). Paleobiological, chemical and sedimentological proxies (micro-fossil composition, stable isotopes, minor/trace elements, Nd isotopes etc), and ice-rafted debris provenance such as Fe-oxide grain fingerprinting will be used. An age model will be constrained by several independent chronostratigraphic techniques (14C, amino-acid racemization, magneto- and biostratigraphy), and correlation with reliable Quaternary stratigraphy, primarily ACEX and LOMROG cores. Results will provide (1) the first Arctic-wide evaluation of the effects of past warm conditions on the Arctic Ocean system and the long-term (ca. 150 kyr) context for climate change in the Arctic, and (2) significant improvements in much-needed boundary conditions for Arctic climate modeling and prediction of the future state of the Arctic Ocean. The Broader Impacts include (1) the participation of one post-doc?, three graduate students and several undergraduate students, (2) presentation of results at conferences and publication of papers, (3) a Web site that will include 3-D visualizations, (4) K-12 teacher and student outreach, (5) multi-investigator, international collaboration, and (6) a contribution to the paleoclimate component of SEARCH, the Study of Environmental Arctic Change.