Meteorological Data Issues for

Class II Increment Analysis

Modeling Domain For Class II Analysis and Meteorological Approach to the Analysis

1. Microscale - Individual Sources or Close Grouping of Sources

Onsite data – Site Specific Analysis, 1 year of data

Offsite data – Screening Analysis,, Multiple years of data

Gaussian Models – up to 100km (50km + S.I.R.)

2. Mesoscale – Increment Consumption over large area, urban growth

Onsite data – Site Specific Analysis, 1 year of data

Offsite data – Screening Analysis, Multiple years of data

Gaussian Models – up to 100km (50km + S.I.R.)

Puff Models – 100s of km

Models and Meteorological Pre-Processors for Class II Analysis

Models Met Processors

SCREEN3 Met. internal to ModelISCST3 MPRM, PCRAMMETAERMOD AERMETCALPUFF CALMET

MPRM and PCRAMMET - Input

Meteorological Input Parameters – Wind Speed, Wind Direction, Temperature, Opaque Cloud Cover, Ceiling Height, Upper Air Data, Precipitation Data

Data Formats - CD144 (surface data) Sampson (surface data support)

TD5600 (upper air data) TD9689 (estimated mixing heights)TD3240 (hourly precipitation) On-site (site specific data)

MPRM and PCRAMMET - Output

Wind SpeedWind DirectionTemperatureStability ClassUrban Mixing HeightRural Mixing Height

AERMET - Input Meteorological Input Parameters – Multi-Level WS, WD, and

Temperature, Opaque Cloud Cover, Ceiling Height, RH, Pressure, Surface Heat Flux, Friction Velocity, and Roughness Length, Delta-T , Solar Radiation, Upper Air Data

Data Formats - CD144, SCRAM, SAMPSON (surface data)

TD 3280 (surface data t)

TD6201 (upper air data)

On-site (site specific data)

AERMET - Output

Boundary Layer File sensible heat flux surface friction velocity convective velocity scale potential temp. gradient above mixing height convectively-driven mixing height mechanically-driven mixing height Monin-Obukhov length surface roughness length Bowen ratio albedo WS, WD, and anemometer. height temperature and measurement height used  

Profile File Measurement height WD, WS Temperature Standard Dev. of Lateral WD Standard Dev. of Vertical WS

Meteorological Parameters

Individual Issues

Wind SpeedLinear Relationship to ConcentrationCollection HeightTerrain ChannelingSurface Roughness

Wind DirectionPersistency

Collection HeightTerrain ChannelingSurface Roughness / Obstructions

Range of Representation

TemperatureVertical Profile (Delta-T)

Stability

Surface Roughness / Obstructions (sigma theta)

Mixing Height (ISC)

Based on two observation

Low mixing heights in early morning.

Urban vs. Rural Determinations

Convective and Mechanical Mixing Heights (AERMOD)

Data availability for calculations

Sensitive to Surface Roughness

Plume splitting (partial penetration) and transport above the mixing layer

Surface Roughness, Albedo, and Bowen Ratio

NWS site are generally flat areas

Use Met site or Source site Surface Characteristics

How do you evaluate an areas

Model sensitivity to parameters

General Issues

Domain Size Straight Line Transport up to 100 km (model limited to 50 km)Generating meteorological parameters of domains extending out hundreds of kilometers – poor resolution

Formulation of Equations and Algorithms /Transferring into Code

Data Formats and Availability

Obsolete Onsite Data Sets (Intro of AERMOD)

General Issues

Available Resources to Collect Data and Perform Analysis

Range of Representation – Horizontal and Vertical

Surface Influences – Roughness, Obstructions, Terrain Effects, Albedo, Bowen Ratio

Available Meteorological Parameters/Collection Rate / QA

Cost – Purchasing, generating and collecting data

The End