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Patrick J. Haley, Jr. 13 November 2002

Patrick J. Haley, Jr. 13 November 2002. Harvard Ocean Prediction System (HOPS) Technical Overview. Patrick J. Haley, Jr. HOPS Modules. Core Domain Set-Up Domain Definition Topography Conditioning Data Manipulation Conversion Quality Control Data Preparation

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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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