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

首席调查员将主持一次讲习班，将对北冰洋及其邻近边缘的地质和地球物理感兴趣的科学家聚集在一起，讨论关于这一区域的关键问题，并为今后的调查制定科学计划。在北极，从加拿大和美国大陆边缘暴露出来的有限的地层记录可以推断出亚细亚盆地的历史。在过去的几年里，在北冰洋盆地从卫星、飞机和潜艇上收集的大量数据已经被提供，并汇编成经过修订和大大改进的水深测量、重力异常和磁力异常的地图和网格。有了这些新的数据，现在就有可能提出关于该盆地历史的具体、具体的假设。检验这些假说将需要协调一致的实地项目。智力价值：在亚细亚盆地可以解决一些基本的科学问题。其中一些问题是北冰洋独有的，而另一些问题则是在较低纬度进行的研究得出的结论。这些问题的解决将需要在整个盆地收集新的数据。这些巡航的费用反对继续采用典型的NSF模型的单一调查者、单一假设、单一巡航模式。要取得进展，将需要多个协调的、多学科的巡航。虽然亚细亚盆地显然是一个大洋盆地，但双方没有就板块边界达成一致。因此，重建北半球新生代以前的古地理在很大程度上是假设的。确定这些界线将有助于破译中生代北冰洋的板块构造史。北冰洋的地层记录包含了独特的古海洋和气候记录。很少有新生代的记录，几乎没有中生代的记录。从白垩纪到更新世，冰盖延伸到盆地，到今天，发生了戏剧性的变化。破译这段历史将补充在较低纬度采集的沉积物和冰芯，并使首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完成，这将需要一些初步巡航收集带状地图和多通道地震剖面来准备。广泛的影响：从国际地球物理年(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、热情和想法是职业生涯中期专注于北冰洋地质和地球物理的科学家以及其他将在未来推进这项工作的博士后和研究生所需要的。这次讲习班的主要目标是在国内和国际上建立这些联系，建立一个共同体，并为未来对亚细亚盆地的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.