California Paleo-Streamflow Records from the Last Interglacial

加州末次间冰期的古水流记录B。加州大学伯克利分校的林恩·英格拉姆这项研究项目的目标是评估旧金山湾在最后一次间冰期(约130至115ka)期间的年平均和季节性盐度以及河流流入。海湾位于圣华金-萨克拉门托河系的入海口，从一个集降水和径流为一体的流域接收河流排放，流域覆盖了加利福尼亚州40%的地区。以前的工作表明，上一次间冰期比现在的间冰期更温暖，海平面更高。这项研究将研究这些以前的变化如何影响一个现在高度城市化的主要河口。这将通过对软体动物贝壳和有孔虫的同位素分析，以及对旧金山湾北部(靠近三角洲)河口沉积物的地层和古生物分析来实现。在这项研究中，我们希望提供关于末次间冰期平均年内流入的自然变异性的数据。为了预测未来全球变暖对旧金山湾河口系统可能产生的影响，我们还希望评估在这段较暖的时期内流入的幅度和季节分布。

ABSTRACTCalifornia Paleo-streamflow records from the Last InterglacialB. Lynn Ingram, University of California, Berkeley The goal of this research project is to assess annual average and seasonal salinity and river inflow to San Francisco Bay during the Last Interglacial (ca 130 to 115 ka). The Bay, located at the mouth of the San Joaquin-Sacramento river system, receives river discharge from a drainage basin that integrates precipitation and runoff over a watershed covering 40% of California. Previous work shows that the Last Interglacial was warmer, with a higher sea level, than the present interglacial. This study will examine how these previous changes have impacted a major, now highly urbanized, estuary. This will be accomplished by isotopic analyses of mollusk shells and foraminifers, as well as stratigraphic and paleontological analysis, of estuarine sediments cored in the northern reach of San Francisco Bay (near the delta). In this study we hope to provide data on the natural variability of average intra-annual inflow during the Last Interglacial. We also wish to assess the amplitude and seasonal distribution of inflow during this warmer period, in order to predict what affect future global warming may have on San Francisco Bay estuarine system.