Collaborative Research: Paleoceanographic constraints on the warming Arctic Ocean

这一由多个调查员参与的合作项目的目标是，基于对希利奥登跨北极探险05(HOTRAX？05)期间发现的第四纪沉积物岩心的多代理调查，评估和描述北极中部温暖、低冰条件下的海冰和水文条件。将使用古生物学、化学和沉积学指标(微化石成分、稳定同位素、微量/微量元素、Nd同位素等)和冰排碎屑来源，如氧化铁颗粒指纹。年龄模型将受到几种独立的年代地层学技术(14C、氨基酸消旋、磁学和生物地层学)的制约，并与可靠的第四纪地层学，主要是ACEX和LOMROG岩心相关联。这些结果将提供(1)对过去温暖条件对北冰洋系统的影响和北极气候变化的长期(约150 KYR)背景的首次北极范围评估，以及(2)对北极气候建模和预测北冰洋未来状况所急需的边界条件的重大改善。更广泛的影响包括(1)一名博士后、三名研究生和几名本科生的参与，(2)在会议上展示结果和发表论文，(3)将包括3-D可视化的网站，(4)K-12教师和学生的外联，(5)多名研究人员，国际合作，以及(6)对搜索的古气候部分的贡献，北极环境变化研究。

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.