EarthCube GEO Domain Workshop Proposal: Envisioning a Digital Crust for Simulating Continental‐ Scale Subsurface Fluid Flow in Earth System Models

为了加深对临界带和更深地壳的认识，更好地耦合地表和地下的物质和能量交换，本项目将举办为期3天的研讨会，以开发一个长？北美大陆地壳数字表示的术语愿景和原型数据模型的设计概念。地壳结构、组成和渗透率的数字目录（以及可以推断渗透率的参数）定义了整合大量不同数据类型的机制，并构建了地下结构和物质属性的连贯3D图像。这样我们就可以开始在地球系统模型中表示地下流体流动，并阐明它在地球系统从过去到现在和未来的演变中的关键控制。从临界带到地壳深处的地下流体循环在地表、近地表和地壳动力学中起着至关重要的作用。在临界带（50m），土壤水是一个生态过滤器和生态位分异器，能量丰富，解释了全球和局部植物分布的模式；浅层地下水是旱季和地区河流、湖泊和湿地的主要来源，因此维持和改变了陆地和水生生态系统，影响水质，缓冲干旱和极端温度。在地壳深处（1公里），巨大的沉积地层和断裂的岩石保存着新鲜的水。支持干旱和半干旱地区主要社会的蓄水层。在地壳深处（1km），流体流动影响成岩作用、烃类、矿床、断裂、地震和地热田，涉及水、气和烃类流动。通过土壤和岩石的流动路径是什么？水流有多快，停留时间有多长？它们将如何应对气候变化和陆地表面驱动因素？答案取决于对地下流场的定量描述，地下流场由水力梯度驱动，但受地球渗透性的强烈控制。fs材料。创建一个数字目录来重建地球上这一采样不足的地区，将使地球科学的多个方面得到转型的推进。

In order to advance the understanding of the critical zone and deeper crust and to better couple the exchange of mass and energy between the surface and the subsurface, this project will hold 3-day workshop to develop a long?]term vision of a digital representation of the continental crust of N. America and design concepts for prototype data model(s). The digital catalog of crustal structure, composition and permeability (as well as parameters from which permeability could be inferred) define the mechanisms by which to integrate vast amounts of dcisparate data types and to construct a coherent, 3D picture of subsurface structure and material properties, so that we can begin to represent subsurface fluid flow in Earth system models and elucidate its critical controls in the evolution of the Earth system from the past to the present and the future.Fluid circulation in the subsurface, from the critical zone to the deeper crust, plays an essential role in surface, near-surface, and crustal dynamics. In the critical zone (50m), soil water is a ecologic filter and niche differentiator where energy is abundant, explaining patterns in plant distribution globally and locally; and shallow groundwater is a primary source for rivers, lakes andwetlands in dry seasons and regions, thereby sustaining and modifying land and aquatic ecosystems, influencing water quality, and buffering against droughts and temperature extremes. Deeper in the crust (1km), the large sedimentary formations and fractured rocks hold the fresh?]water aquifers that support major societies in arid and semi-arid regions. In the deeper crust (1km), fluid flow affects diagenesis, hydrocarbons, ore deposits, faulting, earthquakes, and geothermal fields and involves water, gas and hydrocarbon flow. What are the flow paths through the soils and rocks? How fast are the flows and how long are the residence times? And how will they respond to changes in climate and land surface drivers? The answers depend on a quantitative description of the subsurface flow fields, driven by the hydraulic gradient but strongly controlled by the permeability of the Earth?fs material. Creating a digital catalogue by which to reconstruct this poorly sampled region of the planet will enable multiple aspects of the Earth sciences to advance transformatively.