California Paleo-Streamflow Records from the Last Interglacial

加利福尼亚州末次间冰期古径流记录。林恩英格拉姆，加州大学伯克利分校 本研究项目的目标是评估在末次间冰期（约130至115 ka）的年平均和季节盐度和河流流入旧金山弗朗西斯科湾。海湾，位于圣华金-萨克拉门托河系统的河口，从流域接收河流排放，该流域整合了覆盖加州40%的流域的降水和径流。以前的研究表明，末次间冰期比现在的间冰期更温暖，海平面更高。本研究将探讨这些以前的变化如何影响一个主要的，现在高度城市化，河口。这将通过对软体动物壳和有孔虫的同位素分析以及对在旧金山弗朗西斯科湾（三角洲附近）北方河段取芯的河口沉积物的地层学和古生物学分析来完成。在这项研究中，我们希望提供数据的自然变化的平均年内流入在末次间冰期。我们还希望评估在这段温暖的时期内流入的幅度和季节分布，以预测未来全球变暖可能对旧金山弗朗西斯科湾河口系统产生的影响。

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.