The Earth System Prediction Suite: Toward a Coordinated U.S. Modeling Capability

Abstract

CAPSULE SUMMARY:Benefits from common modeling infrastructure and component 27 interface standards are being realized in a suite of national weather and climate codes. 28 ABSTRACT 29The Earth System Prediction Suite (ESPS) is a collection of flagship U.S. weather and climate 30 models and model components that are being instrumented to conform to interoperability 31 conventions, documented to follow metadata standards, and made available either under open 32 source terms or to credentialed users. 33The ESPS represents a culmination of efforts to create a common Earth system model 34 architecture, and the advent of increasingly coordinated model development activities in the U.S. 35 ESPS component interfaces are based on the Earth System Modeling Framework (ESMF), 36 community-developed software for building and coupling models, and the National Unified 37Operational Prediction Capability (NUOPC) Layer, a set of ESMF-based component templates 38 and interoperability conventions. This shared infrastructure simplifies the process of model 39 coupling by guaranteeing that components conform to a set of technical and semantic behaviors. BODY TEXT 49The software infrastructure that underlies Earth system models includes workhorse utilities as 50 well as libraries generated by research efforts in computer science, mathematics, and 51 computational physics. The utilities cover tasks like time management and error handling, while 52 research-driven libraries include areas such as high performance I/O, algorithms for grid 53 remapping, and programming tools for optimizing software on emerging computer architectures. multiple weather and climate modeling centers could share. This idea was shaped by an ad-hoc, 60 multi-agency working group that had started meeting several years earlier, and was echoed in 61 reports on the state of U.S. climate modeling (NRC 1998, NRC 2001, Rood et al. 2000. Leads 62 from research and operational centers posited that common infrastructure had the potential to 63 foster collaborative development and transfer of knowledge; lessen redundant code; advance 641 Codes compared are CESM 1.0.3, at about 820K lines of code (Alexander and Easterbrook 2011), and ESMF 6.3.0rp1, at about 920K lines of code (ESMF metrics available online at: https://www.earthsystemcog.org/projects/esmf/sloc_annual) 4 computational capabilities, model performance and predictive skill; and enable controlled 65 experimentation in coupled systems and ensembles. This vision of shared infrastructure has been 66 revisited in more recent publications and venues; for example, in the 2012 National Research 67Council report entitled A National Strategy for Advancing Climate Modeling (NRC 2012). 68In this article we describe how the vision of common infrastructure is being realized, and how it 69 is changing the approach to Earth system modeling in the U.S. Central to its implementation is 70an Earth System Prediction Suite (ESPS), a collection of weather and climate models and model 71 components that are being instrumented to confor...

SURFEX v8.0 interface with OASIS3-MCT to couple atmosphere with hydrology, ocean, waves and sea-ice models, from coastal to global scales

“…the Earth System Modeling Framework (ESMF, https://www. earthsystemcog.org/projects/esmf/, Collins et al, 2005;Theurich et al, 2016), and requires splitting of the components into initialize, run, and finalize parts. This approach limits the places where data exchanges can happen, but offers opportunities for performance optimization, as components can be easily run in different layouts on available resources.…”

<TT>sympl</TT> (v. 0.3.2) and <TT>climt</TT> (v. 0.11.0) – Towards a flexible framework for building model hierarchies in Python

“…All components are called in serial order, though there is no design restriction which forbids calling the components in parallel at each time step. 5 Note that "store" could mean to store to disk, display in real time, send over the network, or anything else.…”

The National Earth System Prediction Capability: Coordinating the Giant

“…The most significant architectural task over the next three years will be to ensure that the NUOPC Layer and MAPL are interoperable. The full suite of codes, the ESPS, consists of NUOPCcompliant, documented components and modeling systems from National ESPC centers (Theurich et al 2016). These ESPS codes will serve as the basis of the National ESPC system.…”