An Oceanic Mantle Dynamics Workshop, to be held September 18-20, 2002, in Snowbird, Utah

近年来，人们发展了许多海洋下上地幔流动模式，包括热点地区的羽流上涌和膨胀形成、板块下的小规模对流、快速和缓慢扩张中心下的地幔流动和熔体迁移、热点地区到扩张中心的通道化地幔流动、俯冲板块上的对流翻转、与扩张裂谷相关的软流、澳大利亚-南极不协调带下的下行流、从海沟到山脊的回流，以及在海沟回滚期间围绕俯冲板块的回流。现在，我们第一次进入了这样一个时代：这些通常是推测性的地幔动力学模型可以通过海洋中的测量来测试和完善，这些测量有能力在临界长度尺度上解决地下结构。美国国家海底地震仪仪器库的建立，总共有100多台长时间、宽带仪器，为了解海洋下上地幔的流动动力学提供了一个机会。第一届海洋地幔动力学社区研讨会将于2002年9月18日至20日在犹他州雪鸟市举行。本次研讨会有五个主要目标：(1)强调该计划可以完成的科学研究；(2)制定“跨越式阵列”计划；(3)定义USArray海上组件的设计和技术要求；(4)描述该计划在地球动力学建模、岩石学/地球化学和实验室测量等其他领域的需求；(5)讨论该计划与其他主要地球科学计划的关系。

In recent years, many models of flow in the upper mantle beneath the oceans have been developed including plume upwelling and swell formation at hotspots, small-scale convection beneath plates, mantle flowand melt migration beneath fast and slow spreading centers, channelized mantle flow from hotspots to spreading centers, convective overturn above subducting plates, asthensopheric flow associated with propagating rifts, downwelling beneath the Australian-Antarctic discordance, return flow fromtrenches to ridges, and flow around subducting slabs during trench rollback. Now, for the first time, we are entering an era when these often speculative models of mantle dynamics can be tested and refined withmeasurements in the oceans that have the power to resolve subsurface structure at the critical length scales. The establishment of a U.S. National Ocean Bottom Seismometer Instrument Pool with a total of more than100 long-duration, wide-band instruments provides an opportunity for progress in understanding the dynamics of flow in the upper mantle beneath the oceans.The first Ocean Mantle Dynamics community workshop will be held September 18-20, 2002 in Snowbird, Utah. This workshop has five major objectives: (1) highlight the science that can be done by the program, (2) develop a plan for "leapfrogging arrays", (3) define the design and technical requirements for an offshore component to USArray, (4) describe program needs in other areas like geodynamic modeling, petrology/geochemistry and laboratory measurements, and (5) descuss the relationship of the program to other major geoscience initiatives.