Abrupt Climatic Changes During the Late Quaternary Monitored with Annual to Biennial Resolution in Santa Barbara Basin

伯杰9301438作者建议使用南加州附近圣巴巴拉盆地的层状沉积物，以年度分辨率研究已知或疑似快速气候变化的时期。研究时间包括“中世纪暖期”(公元950-1350年)、气候最佳时期(公元5000年和8000年)、退冰期和全冰期。岩心将通过X光照相术进行扫描，以建立年表并确定感兴趣的级别；对于每个级别，将以年度分辨率采样代表几十年的部分。根据与温度相关的烯烃、稳定碳同位素和氮、浮游植物化石的丰度和分类以及河流厚度，可以推断厄尔尼诺间隔的出现、上升流的强度和初级生产力水平以及区域降水。

Berger 9301438 The authors propose to study periods of known or suspected rapid climate change at an annual resolution, using laminated sediments from Santa Barbara Basin off Southern California. Times of interest include the "Medieval Warm Period" (950-1350 A.D.), the climatic optimum (5000 and 8000 years B.P.), the deglacial period and the full glacial. Cores will be scanned by Xradiography to set up a chronology and identify levels of interest; for each level a section representing a few decades will then be sampled with annual resolution. The occurrence of El Ni~io intervals, intensity of upwelling and levels of primary production, and regional precipitation will be inferred from temperature-dependent alkenones, stable carbon isotopes and nitrogen, abundance and taxonomy of phytoplankton fossils, and varve thickness.