Stratigraphy, Extent, and Paleoclimatic Implications of Middle Pleistocene Glacial/Interglacial Conditions, Coastal NW Alaska

阿拉斯加西北沿海中更新世冰川/间冰期条件的地层学、范围和古气候影响

• 批准号: 8922980
• 负责人: Julie Brigham-Grette
• 金额: $ 12.72万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922980&HistoricalAwards=false
• 关键词: Stratigraphy; Extent; Paleoclimatic; Implications; Middle

The interbedded glaciogenic and marine sediments exposed in many places along western Alaska comprise the best-known Arctic record of late-Cenozoic regional climatic change and eustatic sea-level fluctuations. Western Alaska is one of few areas in Arctic North America where both terrestrial and oceanic records can be clearly resolved. Based upon regional stratigraphic work completed over the last two years, it is now known that glaciation about 500,000 years ago throughout western Alaska was an order of magnitude more extensive than any subsequent glaciation. This award supports an investigation of the well exposed stratigraphy sedimentology, and paleoecology of sediments representing this interglacial/glacial transition to better understand the regional climatic setting that culminated in the last extensive early to middle Pleistocence glacial events in northwestern North America. Marine micro and macrofossils and terrestrial pollen, beetles, and plant macrofossils collected from nearshore prodeltaic deposits will be examined to reconstruct land-sea climatic conditions during this transitional period. Data collected from this project will provide proxy data for understanding regional paleoclimatic conditions with implications for evaluating paleosnowlines, climatic gradients through the Bering Strait, and changing paleogeography at a time of climatic transition.

出露的层间冰川和海洋沉积物， 阿拉斯加西部沿着的许多地方都是最著名的 晚新生代区域气候变化的北极记录及 海平面升降 阿拉斯加西部是 在北美北极的一些地区， 海洋记录可以清晰地分辨出来。 基于 过去两年完成的区域地层工作 据了解，距今约50万年的冰川作用 在阿拉斯加西部， 比后来的任何冰川都要大。 这个奖项 支持对暴露地层的调查 沉积学和沉积物的古生态学， 这个间冰期/冰川期的过渡， 最后一次达到顶峰的区域气候环境 广泛的早中更新世冰川事件， 北美洲西北部 海洋微型和大型化石 以及陆生花粉、甲虫和植物宏体化石 从近岸前三角洲沉积物中收集的， 研究了重建期间的海陆气候条件 这个过渡时期。 本项目收集的数据 将提供替代数据， 古气候条件及其评价意义 古雪线，白令河的气候梯度 海峡，以及气候变化时期的古地理 过渡