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之前无法获得的突发和高频气候变化，但在这里，跨越了100 kyr气候制度的大部分时间，可追溯到~700 ka。解决150 ka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（丹斯高/奥施格周期）反映了海洋-大气系统的重大突变，但由于缺乏合适的较老序列，对这一重要行为的认识主要局限于末次冰期周期。这项研究将通过分析2005年在圣巴巴拉中海峡背斜趋势上采集的32个高沉积速率（~80-120 cm/kyr）岩心的极好套件，首次扩展对这些事件和过程的理解。PI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，清楚地记录了早期的D/O样周期和十年时间尺度上的气候突变。这些岩心为北太平洋气候海洋学行为提供了超高分辨率的窗口，通过100 kyr冰川-间冰期周期占主导地位的大部分时间间隔，这是以前没有在此分辨率下研究过的时间间隔。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研究的各个方面。该项目将资助（2-3）名研究生在CSULB和加州大学戴维斯分校工作，根据岩心的地球化学，动物群和沉积学分析进行古气候和古海洋学调查。该项目为在这三个机构的实验室工作和研究项目中培训和支持本科生（共5-10人）提供资金。该计划将把来自NSF目标代表性不足的群体的学生作为NSF资助的CSULB地球科学多样性增强计划的本科研究组成部分的一部分。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频繁演讲的记录。

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.