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

首席研究员将主持一个讲习班，将对北冰洋及其邻近边缘的地质和地球物理学感兴趣的科学家聚集在一起，讨论有关该地区的关键问题，并为未来的研究制定科学计划。在北极，美亚海盆的历史是从加拿大和美洲大陆边缘暴露的有限地层记录中推断出来的。在过去几年中，从卫星、飞机和潜艇上收集的大量北冰洋海盆数据已被提供，并被汇编成经修订和大大改进的测深、重力异常和磁力异常地图和网格。有了这些新的数据，现在有可能对该盆地的历史提出具体、具体的假设。检验这些假设需要协调一致的实地方案。 智力优势：许多基本科学问题可以在美亚流域得到解决。其中一些问题是北冰洋特有的，而另一些问题则是在低纬度地区进行的研究所造成的。解决这些问题需要在整个流域收集新的数据。这些巡航的费用反对继续在单一的调查员，单一的假设，单一的巡航模式，这是典型的NSF模型。要取得进展，就需要进行多次协调一致的多学科考察。虽然美亚海盆显然是一个大洋海盆，但没有相互商定的板块边界得到承认。因此，新生代之前的北方古地理重建在很大程度上是假设的。确定这些边界将有助于破译中生代北冰洋的板块构造历史。北冰洋的地层记录包含了独特的古海洋学和气候记录。新生代和中生代的记录几乎都没有取样。从白垩纪到更新世发生了巨大的变化，当时冰盖延伸到盆地，直到今天。破译这段历史将补充在低纬度地区采集的沉积物和冰芯，并首次使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，这将需要一些初步的巡航收集测绘带和多通道地震剖面来准备。更广泛的影响：在国际地球物理年（IGY）、冰岛和极地级美国海岸警卫队破冰船开始他们的北极职业生涯的一代地球科学家已经退休。他们的经验，热情和想法是谁专注于北冰洋地质学和地球物理学和其他人，博士后和研究生谁将在未来推进这项工作的中期职业科学家所需要的。这次研讨会的主要目标是在国内和国际上建立这些联系，建立一个社区，并为美亚流域的未来研究制定一个连贯的计划。

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.