Collaborative Research: Co-Evolution of Submillennial and Orbital Scale Climate and Ocean Behavior during the Last 700 kyrs: The Unique Santa Barbara Basin Record

该项目将以以前在150ka之前无法获得的超高分辨率调查突然和高频的气候变化，但这里将100 KYR气候制度的大部分时间追溯到~700ka。解决约150ka之前的短期气候行为对于理解导致气候突变的过程、阈值和反馈至关重要。千年尺度的气候振荡(Dansgaard/Oeshger周期)反映了海洋-大气系统的重大突变，然而，由于无法获得合适的较老序列，对这一重要行为的了解主要限于上一次冰川周期。这项研究将通过分析2005年在圣巴巴拉海峡中背斜趋势上采集的32个高沉积速率(约80-120厘米/KYR)岩芯，首次扩大对这些事件和过程的理解，在那里，海底露出了更古老的隆起地层序列。PI初步工作证实，圣巴巴拉盆地能够以前所未有的分辨率揭示这一时间跨度的气候历史，清楚地记录了早期类似D/O的旋回和十年时间尺度上的突然气候变化。这些岩芯提供了超高分辨率窗口，通过100KYR冰川-间冰期周期主导的大部分时间间隔了解北太平洋的气候-海洋学行为，这个时间间隔以前没有在这种分辨率下进行研究。这项研究的更广泛的影响包括将三所大学的研究生和本科生纳入这项研究的所有方面。该项目将资助(2-3)名研究生在加州大学洛杉矶分校和加州大学戴维斯分校从事基于岩心的地球化学、动物群和沉积学分析的古气候和古海洋调查。该项目为这三个机构的实验室工作和研究项目的本科生(总计5-10人)提供培训和支持。该计划将吸收来自NSF目标群体的学生，作为CSULB由NSF资助的地球科学多样性增强计划本科生研究部分的一部分。该项目中的三名研究人员都有将气候变化主题纳入大型本科课程和公众的频繁陈述中的记录。

The project will investigate abrupt and high-frequency climate change at an ultra-high resolution previously unobtainable before 150 ka, but here spanning most of the 100-kyr climate regime back to ~700 ka. Resolving short-term climate behavior before ~150 ka is critical for understanding processes, thresholds, and feedbacks that contribute to abrupt climate change. Millennial-scale climate oscillations (Dansgaard/Oeshger cycles) reflect major abrupt shifts in the ocean-atmosphere system, yet knowledge of this important behavior is largely confined to the last glacial cycle, owing to the unavailability of suitable older sequences. This study will extend the understanding of these events and processes for the first time by analysis of a superb suite of 32 high-sedimentation rate (~80-120 cm/kyr) cores taken in 2005 on the Santa Barbara Mid-Channel anticlinal trend, where older, uplifted stratigraphic sequences crop out on the ocean floor. The PIs preliminary work confirms that Santa Barbara Basin can reveal climate history in unprecedented resolution for this time span, clearly recording earlier D/O-like cycles and abrupt climate change on decadal time scales. The cores provide ultra-high resolution windows into climatic-oceanographic behavior of the north Pacific through much of the interval dominated by the 100 kyr glacial-interglacial cycles, an interval not previously studied at this resolution. The broader impacts of this study include incorporating Graduate and undergraduate students at three universities will be involved in all aspects of the study. This project will fund (2-3) graduate students to work at CSULB and UC Davis on the paleoclimatic and paleoceanographic investigations based on the geochemical, faunal, and sedimentologic analyses of the cores. This project provides funds for training and support of undergraduates (5-10 total) in laboratory work and research projects at the three institutions. The program will incorporate students from NSF-targeted underrepresented groups as part of the undergraduate research component of the NSF-funded Geoscience Diversity Enhancement Program at CSULB. All three researchers in this project have a track record of incorporating climate change topics into frequent presentations for large undergraduate courses and the public.