Workshop: Geodynamics and Paleoclimate of the Amerasian Basin and its Margins; Washington, DC; June 6-8, 2004

研讨会：美亚盆地及其边缘的地球动力学和古气候；

• 批准号: 0352995
• 负责人: Bernard Coakley
• 金额: $ 4.82万
• 依托单位: University of Alaska Fairbanks Campus
• 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: 2004-03-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0352995&HistoricalAwards=false
• 关键词: Workshop; Geodynamics; Paleoclimate; Amerasian; Basin

The Principal Investigator will host a workshop to bring scientists interested in the geology and geophysics of the Arctic Ocean and its adjacent margins together to discuss the critical questions about this region and formulate a science plan for future investigations. In the Arctic, the history of the Amerasian basin has been inferred from the limited stratigraphic record exposed on the Canadian and American continental margins. During the last few years, an outpouring of data collected in the Arctic Ocean basin from satellites, airplanes, and submarines has been made available and compiled into revised and much improved maps and grids of bathymetry, gravity anomalies and magnetic anomalies. With these new data, it is now possible to formulate concrete, specific hypotheses about the history of the basin. Testing these hypotheses will require coordinated field programs. Intellectual Merit: A number of basic scientific problems can be addressed in the Amerasian Basin. Some of these problems are unique to the Arctic Ocean while others are framed by studies conducted at lower latitudes. Solutions of these problems will require new data collected throughout the basin. The expense of these cruises argues against continuing in the single investigator, single hypothesis, single cruise mode that is the typical NSF model. Making progress will require multiple coordinated, multi-disciplinary cruises. While the Amerasian Basin is clearly an oceanic basin, no mutually agreed upon plate boundaries are recognized. As a result, reconstructions of the paleo-geography of the northern hemisphere prior to the Cenozoic are largely hypothetical. Identifying these boundaries will help to decipher the plate tectonic history of the Mesozoic Arctic Ocean. The stratigraphic record of the Arctic Ocean contains a unique paleooceanographic and climatic record. Little of the Cenozoic and almost none of the Mesozoic record has been sampled. Dramatic changes have occurred since the Cretaceous through the Pleistocene, when ice sheets extended out into the basin, to the present day. Deciphering this history will complement the sediment and ice cores taken at lower latitudes and make it possible to study truly global paleoclimate for the first time. This work will be accomplished by scientific drilling, which would require a number of preliminary cruises collecting swath mapping and multi-channel seismic profiling to prepare.Broader Impacts: The generation of earth scientists who began their arctic careers with International Geophysical Year (IGY), ice islands and Polar-class U.S Coast Guard icebreakers has retired. Their experience, enthusiasm and ideas are needed by the mid-career scientists who have focused on Arctic Ocean geology and geophysics and others, post-docs and graduate students who will advance this work in the future. The major objectives of this workshop are to make these connections, both domestically and internationally, build a community and develop a coherent plan for the future studies of the Amerasian Basin.

首席研究人员将举办一个研讨会，以使对北极海洋地质和地球物理学感兴趣的科学家一起讨论有关该地区的关键问题，并制定一项科学计划，以供未来的调查。在北极，已经从加拿大和美国大陆边缘的有限地层记录中推断出了阿美拉萨斯盆地的历史。在过去的几年中，已经提供了从卫星，飞机和潜艇从北极海洋盆地收集的数据，并将其汇编成经过修订的，重大改进的地图和网格的测深，重力异常和磁异常。有了这些新数据，现在可以制定有关盆地历史的具体，具体的假设。测试这些假设将需要协调的现场计划。 知识分子的优点：在阿美拉萨斯盆地中可以解决许多基本科学问题。其中一些问题是北极海洋独有的，而另一些问题是由较低纬度进行的研究构成的。这些问题的解决方案将需要在整个盆地中收集的新数据。这些巡游的费用反对在单个研究者中继续进行单个假设，单次巡航模式，即典型的NSF模型。取得进展将需要多个协调的多学科巡游。虽然阿美拉萨斯盆地显然是一个海洋盆地，但没有认识到板块边界。结果，在新生代之前，北半球古地理的重建基本上是假设的。识别这些边界将有助于破译中生代北极海洋的板块构造历史。北极海洋的地层记录包含独特的古志和气候记录。几乎没有采用的新生代和几乎没有中生代的记录。自白垩纪穿越更新世以来，当冰片延伸到盆地到今天以来，发生了巨大的变化。破译这一历史将补充较低纬度的沉积物和冰核，并使得第一次研究真正的全球古气候成为可能。这项工作将通过科学钻探来完成，科学钻探将需要许多初步的巡航，以收集围墙映射和多渠道地震概况进行准备。专注于北极海地地质和地球物理学等，新生儿和研究生的中级科学家需要他们的经验，热情和想法，他们将来会推进这项工作。该研讨会的主要目的是在国内和国际上建立这些联系，建立一个社区并制定一项连贯的计划，以对阿米拉斯盆地的未来研究。