ITR Collaborative Research: Diversity of Biogeochemical Processes: Modeling Multiple Biomes on Multiple Flow Scales in the Eastern Pacific Ocean

这个多学科的研究项目将探索和扩展信息技术能力的前沿，通过在大范围的空间尺度（通过创新的嵌入式网格和先进的代码架构）和广义的适应性生态食物网（通过多个浮游生物的大小类，功能组和限制营养素）在现实的模型配置为太平洋。这种元素的组合是前所未有的，因此推动了模拟现实的极限。海洋环流和海洋地球化学的模拟将以区域海洋模拟系统的继续开发为基础，该系统是一个相对较新的计算代码，具有创新的时空离散化、次网格尺度输运参数化、开放边界条件和嵌入网格能力。计算研究将集中在：双向嵌入和跨嵌入级别的通量一致性，并行化性能和可移植性，以及代码架构的软件协议。生物部分将来自一个新的全球生态系统模型，明确对待铁的限制，固氮，大小结构和硅藻水华。该战略将以粗略的空间分辨率模拟整个太平洋环流和生物学（即，不解决的漩涡），然后调查中尺度的影响，在三个生产，区域子域沿着东部边界热带，亚热带和亚极地，具有独特的生物群落在精细分辨率。耦合的解决方案将进行分析，以确定中尺度的生物-物理变化的纠正，以更大的尺度，出现不同的生物群系从一套广义的生态规则，以及生物的复杂性水平，以匹配观测的基础上信息理论模型选择技术。更广泛的影响：虽然这些研究的重点是具有特定海洋行为的特定地方，但它们将为全球海洋过程提供一个通用原型，并为缩小行星尺度气候模拟以确定其区域尺度后果的重要挑战提供一个通用原型。该项目是加州大学洛杉矶分校和伍兹霍尔海洋研究所之间的多学科合作。这些人员在物理，生物和化学海洋学以及国家级高端计算建模所需的算法和程序方面具有专业知识。 他们将培训一名博士后和一名研究生使用这些复杂的工具。

This multidisciplinary research project will explore and expand the frontier of Information Technology capabilities by incorporating variability across a large range of spatial scales (through innovative embedded griding and advanced code architecture) and generalized adaptive ecological food webs (through multiple planktonic size classes, functional groups, and limiting nutrients) in realistic model configurations for the Pacific Ocean. This proposed combination of elements is unprecedented and thus pushes against the limits of simulating reality. The simulations of oceanic circulation and biogeochemistry will be based on the continued development of the Regional Oceanic Modeling System (ROMS), a relatively new computational code with innovative space-time discretization, sub-gridscale transport parameterizations, open-boundary conditions, and embedded griding capabilities. The computational research will focus on: 2-way embedding and flux-consistency across embedding levels, parallelization performance and portability, and software protocols for code architecture. The biological component will derive from a new global ecosystem model that explicitly treats iron limitation, nitrogen fixation, size structure, and diatom blooms. The strategy will be to simulate the entire Pacific Ocean circulation and biology at coarse spatial resolution (i.e., not resolving the eddies) and then investigate mesoscale influences at fine resolution in three productive, regional subdomains along the eastern boundary-tropical, subtropical and subpolar-with distinctive biomes. The coupled solutions will be analyzed to determine the rectification of mesoscale biological-physical variability to larger scales, the emergence of distinct biomes from a generalized set of ecological rules, and the level of biological complexity required to match observations based on information theoretic model-selection techniques. Broader Impacts: Although these studies are focused on particular places with particular oceanic behaviors, they will provide a generic prototype for oceanic processes globally and for the important challenge of downscaling planetary-scale climate simulations to determine their regional-scale consequences. This project is a multi-disciplinary collaboration between UCLA and Woods Hole Oceanographic Institution. The personnel have expertise in physical, biological, and chemical oceanography and in the algorithms and procedures required for high-end computational modeling at the national supercomputing centers and they will train a post-doc and a graduate student in using these complex tools.