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Patrick J. Haley, Jr. 13 November 2002

Explore the modules, data processing, model setup, and advanced features of the HOPS system developed by Patrick J. Haley, Jr. Learn about dynamical models, data assimilation, nesting, and more.

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Patrick J. Haley, Jr. 13 November 2002

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  1. Patrick J. Haley, Jr. 13 November 2002 Harvard Ocean Prediction System (HOPS) Technical Overview

  2. Patrick J. Haley, Jr.

  3. HOPS Modules • Core • Domain Set-Up • Domain Definition • Topography Conditioning • Data Manipulation • Conversion • Quality Control • Data Preparation • Mapping (Objective Analysis) • Preparation for Model Ingestion • Dynamical Model • Primitive Equation • Terrain Following Coordinates • Data Assimilation (OI) • Biological Models • 2-way Nesting • External Forcing (atmospheric, tidal, river) • Additional • Error Sub-Space Statistical Estimation (ESSE) Data Assimilation • Multi-Scale Energy and Vorticity Analysis (MS-EVA) • Up and Coming • Free Surface Patrick J. Haley, Jr.

  4. HOPS PE Model • Based on GFDL Bryan & Cox • Arakawa B-Grid • 2nd order finite difference • Leap Frog Time Stepping • Additions • Open Boundary Conditions • Shapiro Filter Subgrid Scale Parameterization • Terrain Following Coordinates • , hybrid, 2- • robust pressure gradient algorithm • OI Assimilation • 2-way Nesting • External Forcing (atmospheric, tidal, river) • Coupled Biological Models Patrick J. Haley, Jr.

  5. 2-Way Nesting • At each time step, independent estimates are made in each domain. • Nesting algorithm “aligns” the estimates at each time step. • Fine grid data is averaged to update coarse grid estimates. • Collocation simplifies navigation between coarse nodes and supporting fine grid nodes. • 3:1 ratio for scale matching • Coarse grid data is interpolated onto fine grid boundaries • Bi-Cubic interpolation. Compromise between: • Smoothness across coarse grid boundaries • “Footprint” of the interpolation Patrick J. Haley, Jr.

  6. Focus Domains Support Domains Patrick J. Haley, Jr.

  7. Issues • Set Up • Domain Set-Up • Baseline Topography • Process Selection • California Current Influence • Rivers • Tides • OSSE • Domain Set-Up • Domain Definitions • Extents • Resolutions • Vertical Distributions • Topography Conditioning • Model Tuning • Parameters • Assimilation Methodology Patrick J. Haley, Jr.

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