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

合作研究：过去 700 公里亚千禧年和轨道尺度气候与海洋行为的共同演化：独特的圣巴巴拉盆地记录

• 批准号: 0825322
• 负责人: James Kennett
• 金额: $ 49.52万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825322&HistoricalAwards=false
• 关键词: Collaborative; Research; Co; Evolution; Submillennial

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.

该项目将以超高分辨率研究突然的高频气候变化，这在 150 ka 之前是无法获得的，但这里跨越了 100 kyr 气候体系的大部分，可追溯到约 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。千年尺度的气候振荡（丹斯加德/厄什格循环）反映了海洋-大气系统的重大突变，但由于缺乏合适的较旧序列，对这一重要行为的了解在很大程度上仅限于最后一个冰川周期。这项研究将通过分析 2005 年在圣巴巴拉中河道背斜趋势上采集的 32 个高沉积速率（~80-120 cm/kyr）岩心，首次扩展对这些事件和过程的理解，更古老的隆起地层序列出现在海底。 PI 的初步工作证实，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，清楚地记录早期的 D/O 型循环和十年时间尺度上的气候突变。这些岩心为了解北太平洋的气候海洋学行为提供了超高分辨率窗口，该窗口的大部分时间段以 100 kyr 冰期-间冰期旋回为主，而此前尚未在此分辨率下研究过该时间段。这项研究的更广泛影响包括三所大学的研究生和本科生将参与该研究的各个方面。该项目将资助 (2-3) 名研究生在 CSULB 和加州大学戴维斯分校进行基于岩心地球化学、动物和沉积学分析的古气候和古海洋学调查。该项目为本科生（共 5-10 名）在三个机构的实验室工作和研究项目提供培训和支持。该项目将吸收来自 NSF 针对代表性不足群体的学生，作为 NSF 资助的 CSULB 地球科学多样性增强项目的本科生研究部分的一部分。该项目的所有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演示中的记录。