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150 ka之前无法实现的超高分辨率研究突然和高频气候变化，但在这里跨越大部分100公里气候制度的大部分，回到〜700 ka。在〜150 ka之前解决短期气候行为对于理解有助于突然气候变化的过程，阈值和反馈至关重要。千禧一代的气候振荡（Dansgaard/Oeshger周期）反映了海洋 - 大气系统中的主要突然转移，但由于不可用的旧序列，这种重要行为的知识在很大程度上仅限于最后的冰川周期。这项研究将通过分析2005年在圣塔芭芭拉中渠道的偏板趋势上分析32个高级速率（〜80-120 cm/kyr）核心的出色套件，从而扩展对这些事件和过程的理解，在海上，较旧的，上升的地层序列在海面。 PI的初步工作证实，圣塔芭芭拉盆地可以在这段时间内以空前的分辨率揭示气候历史，清楚地记录了较早的D/O样周期和衰老时间尺度上的突然的气候变化。核心通过以100 kyr冰川间 - 冰川循环为主的大部分时间间隔为北太平洋的气候传播行为提供了超高分辨率的窗口，这是以前未在该分辨率下研究的间隔。这项研究的更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。该项目将基于核心的地球化学，动物和沉积学分析，资助（2-3）的研究生在CSULB和UC DAVIS工作。该项目为三个机构的实验室工作和研究项目提供了培训和支持的资金（总计5-10个）。该计划将纳入来自NSF的代表性不足的群体的学生，这是CSULB NSF资助的地球科学多样性增强计划的本科研究组成部分的一部分。该项目中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中的记录。