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

该项目将以超高分辨率调查150 ka以前无法获得的突变和高频气候变化，但这里跨越了100 kyr气候状态的大部分时间，可追溯到~700 ka。解决~ 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。千禧年尺度的气候振荡（Dansgaard/Oeshger旋回）反映了海洋-大气系统的主要突变，但由于没有合适的更早序列，对这一重要行为的认识主要局限于末次冰期旋回。这项研究将首次通过分析2005年在圣巴巴拉海峡中部背斜趋势上采集的一组极好的32个高沉积速率（~80- 120cm /kyr）岩心来扩展对这些事件和过程的理解，在那里，海底出现了更古老的隆起的地层序列。PIs的初步工作证实，圣巴巴拉盆地可以以前所未有的分辨率揭示这一时间跨度的气候历史，清楚地记录了早前的D/ o样周期和十年时间尺度上的气候突变。这些岩心提供了超高分辨率的窗口，通过100 kyr冰期-间冰期旋回主导的大部分间隔，研究北太平洋的气候-海洋学行为，这个间隔以前没有以这种分辨率进行过研究。本研究的广泛影响包括将三所大学的研究生和本科生纳入研究的各个方面。该项目将资助（2-3）名研究生在CSULB和UC Davis进行古气候和古海洋研究，该研究基于对岩心的地球化学、动物和沉积学分析。本项目提供本科生（共5-10人）在三所院校从事实验室工作和研究项目的培训和支持。该项目将纳入来自nsf目标群体的学生，作为nsf资助的CSULB地球科学多样性增强项目的本科生研究组成部分。该项目的所有三位研究人员都有将气候变化主题纳入大型本科课程和公众演讲的记录。

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.