California Current Sensitivity to Pacific Climate: Interdecadal Changes Reconstructed From Tree Rings and Varves

摘要ATM-9509780 Berger，Wolfgang University of加州，San Diego标题：加州海流对太平洋气候的敏感性： 由树木年轮重建的年代际变化 纹泥 仪器海洋和大气参数沿着美国西海岸包含大量的年代际变化，但记录太短，解决时间和空间的细节，在时间尺度大于几年。 对20世纪70年代末北太平洋海盆气候“转变”的观测研究表明，年代际波动可能与热带太平洋有关，可能是通过厄尔尼诺与拉尼娜事件的频率和强度。 了解年代际变率对于评估全球变化现象至关重要。 该奖项支持一个项目，使用代理记录来描述加州海流的十年到世纪变化，因为它与阿留申低/西海岸脊复合体以及热带太平洋的温暖和凉爽事件有关。 由于低频的时间波动通常有很大的空间影响，这个项目将利用一系列的代理气候记录，为上个千年提供的树木年轮年表在美国西部和在芭芭拉盆地的纹状沉积物。 这项研究将澄清北太平洋东部最近的年代际变化是低频自然变率的反映，还是它们代表了一个独特的插曲，没有类似的。 拟议的研究是一个跨学科项目，涉及斯克里普斯海洋学研究所地质研究司和气候研究司，以及亚利桑那大学树木年轮研究实验室。

Abstract ATM-9509780 Berger, Wolfgang University of California, San Diego Title: California Current Sensitivity to Pacific Climate: Interdecadal Changes Reconstructed From Tree Rings and Varves Instrumental oceanic and atmospheric parameters along the American West Coast contain substantial decadal variability, but the record is too short to resolve temporal and spatial details at time scales greater than a few years. Observational studies of the climate "shift" in the North Pacific basin during the late 1970's suggest that decadal fluctuations may be linked to the Tropical Pacific perhaps via the frequency and intensity of El Nino versus La Nina events. An understanding of inter-decadal variability is crucial to evaluate global change phenomena. This award supports a project using proxy records for describing the decadal-to-century variability of the California Current at it relates to the Aleutian Low/West Coast Ridge complex and to warm and cool episodes in the Tropical Pacific. Since low-frequency temporal fluctuations usually have large spatial effects, this project will exploit an array of proxy climate records for the last millennium provided by tree-ring chronologies over the Western U.S. and by varve sediments in the Barbara Basin. This study will clarify whether recent decadal changes in the eastern North Pacific are a reflection of low-frequency natural variability or whether they represent a unique episode wit no analog. The proposed research is an interdisciplinary project involving the Geological Research Division and the Climate Research Division of Scripps Institution of Oceanography, together with the Laboratory of Tree-Ring Research of the University of Arizona.