Collaborative Research: Paleoceanographic constraints on the warming Arctic Ocean

这个多研究者合作项目的目标是基于对希利-奥登跨北极考察期间恢复的第四纪沉积物岩心的多代理调查，评估和表征北极中部温暖、低冰条件时期的海冰和水文条件。05 (HOTRAX ? 05)。将使用古生物学、化学和沉积学指标（微化石组成、稳定同位素、微量元素、Nd同位素等）和浮冰碎屑物源（铁氧化物颗粒指纹图谱等）。年龄模型将受到几种独立的年代地层技术（14C、氨基酸外消旋化、磁地层学和生物地层学）以及与可靠的第四纪地层（主要是ACEX和LOMROG岩心）的对比的限制。结果将提供(1)对过去温暖条件对北冰洋系统和北极气候变化长期（约150 kyr）背景的影响的第一次全北极范围的评估，以及(2)对北极气候模拟和预测北冰洋未来状态急需的边界条件的重大改进。更广泛的影响包括(1)一个博士后的参与？(2)在会议上发表研究成果并发表论文；(3)建立一个包括三维可视化的网站；(4)K-12教师和学生的推广；(5)多研究员、国际合作；(6)为SEARCH（北极环境变化研究）的古气候部分做出贡献。

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.