The Puget Sound Regional Environmental Prediction System: An Update.

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Presentation transcript:

The Puget Sound Regional Environmental Prediction System: An Update

Can we create an integrated regional environmental modeling system for research and prediction by coupling preexisting models and using all operational data assets?

Current MM5 Configuration The Penn. State/NCAR mesoscale model V3.5 is being run: twice a day at 36/12/4 km horizontal grid spacing. 38 levels forced by the NCEP Global Forecast System (GFS) run 0 to 72h for 36/12 0 to 48 h for 4 km Twice a day at 36/12km grid spacing forced by the NCEP Eta Model (available sooner)

Some Comments A 4-km model does NOT resolve 4-km scale features…more like km. There are major issues (problems) in the physical parameterizations that we are actively working to improve, such as: –Moist physics –Land surface and boundary-layer physics –Radiation schemes

Tahoma: A 30 processor SUN ES 6500 with 4 GB Memory

Ensemble: a 20 processor athlon cluster

WRF Cluster: The Most Powerful Computer: 32-Processor Athlon Linux Cluster

The “Audience” for PNW MM5 Products Continues to Increase

Current MM5 System Model forecasts are verified against all regional observations Model graphics are available on the web Model grids are shipped to some consortium members (e.g., NWS)

A Vision of an Integrated Regional Modeling System Output from the MM5 is now being fed into a number of modeling and diagnostic systems: Distributed Hydrological Model for Western Washington (PRISM Major Support) Calgrid Air Quality Model Land Surface Model for Surface Temperature Prediction Smoke, Ventilation, and Fire Guidance Transportation Information System And hopefully soon will be integrated with others (e.g. Puget Sound)

Terrain meter aggregated from 30 meter resolution DEM Land Cover - 19 classes aggregated from over 200 GAP classes Soils - 3 layers aggregated from 13 layers (31 different classes); variable soil depth from 1-3 meters Stream Network - based on 0.25 km 2 source area

DHSVM Distributed Hydrological Prediction System

Calgrid Air Quality Prediction System

Washington State DOT Traveler Information System

U.S. Forest Service Smoke and Fire Management System

Ventilation Index

U.S. Forest Service MM5 grids are sent to the field for running Eulerian and Lagrangian smoke plume/dispersion models. MM5 output used for fire fighting operations.

Military Applications The NW MM5 is now the main source of regional forecasts for Navy and Air Force operations at Whidbey NAS and McChord Air Force Base, as well as the Everett Carrier homeport.

Ensemble Forecasting A major push has been made toward ensemble forecasting using the MM5. The goal is to provide probabilistic predictions, including forecasts of model skill. The MM5 is now being run at 36/12 km resolution with approximately 15 different initializations and lateral boundary conditions

Regional Ensemble Configuration Makes use of the differing initializations (and boundary conditions) from major operational NWP centers (e.g., NCEP, Navy, Canadian, UKMET, Australian, Taiwanese, etc). Early results very encouraging (e.g., using ensembles to predict forecast skill)

Relating Forecast Skill and Model Spread Mean Absolute Error of Wind Direction is Far Less When Spread is Low

Regional Observational Database Since the mid-1980’s, have collected all available data networks in the Pacific NW Data collected and quality controlled in real-time Database used to create regional analyses available on the web and shipped to some consortium members. The database is used for verification of the regional MM5 forecasts.

Puget Sound

Research on Physical Parameterizations IMPROVE: To improve moist physics in mesoscale models using data from the Pacific Northwest. Multi-investigator project. Data from a major field experiment PBL Parameterization Project: Evaluation and improvement of MM5 PBL schemes. Sponsored by the Forest Service

Should we go to higher resolution over Puget Sound? Perhaps 1.3 km?

Modeling Winds in the Columbia Gorge Strongest winds are at the exit Portland Troutdale Cascade Locks

The Future Hopefully, 1.3 km grid spacing domains will be added over Puget Sound and the Columbia Gorge Major physics improvements Seven-day runs at km resolution Maturation of the ensemble system ….and…

Mesoscale Climate Forecasting Computer power is now available to run at high resolution (12km) for 5-10 years Driven by GCM climate predictions, could gain insights into local implications of global warming.