Last Glacial to Recent in the Gulf of California: A Sediment Trapping and Long Piston Coring Program

由于其地理和海洋环境， 加州记录了一个混合的海洋和区域海洋学 气候信号。 极高的沉积速率 和频繁出现的年纹层（纹层）使海湾 进行高分辨率研究的理想地点 古环境变化的季节性和千年（和 更大）规模。 尽管长期以来对海湾纹藻的兴趣，这将是第一个 项目使用沉积物陷阱，以直接确定的过程 形成纹状结构。 结果将导致更好的 了解气候/海洋记录是如何 保存，这将用于恢复冰川以及 间冰期沉积物 本文将对以下假设进行检验：1）纹层形成 是由季节性输入的风吹陆源物质造成的 材料，2），光，暗纹层的季节性时间 形成之间的东部和西部两侧的不同 海湾，3），沉积的非层状沉积物期间， 冰川期和新仙女木期是由于氧气的增加， 中深水沃茨营养物含量减少 太平洋，以及4）海湾18-0的冰消振荡 这是由低盐度事件造成的，可能是由 季风环流增强。

Because of its geographic and oceanographic setting, the Gulf of California records a mix of oceanwide and regional oceanographic and climatic signals. The extremely high rates of sedimentation and frequent occurrence of annual laminae (varves) make the Gulf an ideal location for carrying out high resolution studies of paleoenvironmental change on the seasonal to millenial (and greater) scale. Despite the long interest in Gulf varves, this will be the first project to use sediment traps to directly determine the process of varve formation. The results will lead to a better understanding of how the climatic/oceanographic record is preserved, which will be used in the recover glacial as well as interglacial sediments. Following hypotheses will be tested: 1) that varve formation results from the seasonal input of wind-blown terrigenous material, 2) that the seasonal timing of light and dark laminae formation differs between the eastern and western sides of the Gulf, 3) that the deposition of nonlaminated sediment during glacial and Younger Dryas time resulted from increased oxygen and decreased nutrient content of intermediate depth waters in the Pacific Ocean, and 4) that deglacial oscillations of Gulf 18-0 resulted from episodes of lower salinity, perhaps caused by increased monsoonal circulation.