Collaborative Research: Investigation of Holocene Seasonality and Inter-annual Variability Along the California Current System

合作研究：沿加州洋流系统研究全新世季节性和年际变化

• 批准号: 0402685
• 负责人: Stephen Schellenberg
• 金额: --
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0402685&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigation; Holocene; Seasonality

Under this award the PIs will perform an integrated data-modeling study of Holocene oceanographic changes along the NE Pacific margin to understand the impact of Holocene climatic and oceanographic changes on marine and terrestrial communities (including human populations) along the NE Pacific Margin. The paleoenvironmental data will come from oxygen isotope, minor element, and 14C analyses of dated mollusk shells from archaeological sites in central California and British Columbia. Most of these shells have already been individually dated via 14C analysis as part of a project supported by NSF Geology & Paleontology. By coupling these three biogeochemical tracers, and examining both bulk samples (which integrate several years of growth) and intraskeletal growth series (which provide weekly-to-monthly temporal resolution), the PIs can reconstruct millennial, inter-annual, and seasonal variability in ocean temperature, upwelling intensity, and freshwater flux to the coastal zone. Through studies of extant mollusks, the PIs will develop species-specific isotope and minor element calibrations and assess the levels of variance inherent to nearshore species. To place the data in broader context, the PIs will use globaland regional-scale coupled atmosphere-ocean models to study the impact of changes in climate forcing on ocean currents, surface temperature, upwelling, and precipitation on a variety of time scales. Comparison of model results with proxy data will permit model performance, and may reveal key gaps in the proxy record. In addition to gaining insight into the factors driving climatic and oceanographic change along the NE Pacific margin, the PIs will use our climate data to test hypotheses for Holocene anthropological and paleoecological transitions.

根据该奖项，PI将对东北太平洋边缘沿着的全新世海洋变化进行综合数据建模研究，以了解全新世气候和海洋变化对东北太平洋边缘沿着海洋和陆地社区（包括人口）的影响。古环境数据将来自于对来自加州中部和不列颠哥伦比亚省考古遗址的过时软体动物贝壳的氧同位素、微量元素和14 C分析。这些贝壳中的大多数已经通过14 C分析单独确定了年代，这是NSF地质古生物学支持的项目的一部分。通过耦合这三个地球化学示踪剂，并检查散装样品（其中集成了几年的增长）和intrasketrophic增长系列（提供每周到每月的时间分辨率），PI可以重建千年，年际和季节性变化的海洋温度，上升流强度和淡水通量的沿海地区。通过对现存软体动物的研究，研究所将制定特定物种的同位素和微量元素校准，并评估近岸物种固有的差异程度。为了将数据置于更广泛的背景下，PI将使用全球和区域尺度的大气-海洋耦合模式来研究气候强迫变化对洋流，表面温度，上升流和降水在各种时间尺度上的影响。将模型结果与代理数据进行比较将有助于模型的性能，并可能揭示代理记录中的关键空白。除了深入了解东北太平洋边缘沿着气候和海洋变化的驱动因素外，PI还将使用我们的气候数据来测试全新世人类学和古生态学转变的假设。