Combined Aerosol Trajectory Tool, CATT Status Report on Tools Development and Use Project supported by the Inter-RPO Data Analysis Workgroup Project Manager: Sirpil Kayin, MARAMA Technical Project Officer: Rich Poirot, Vermont DEP Project performed by CAPITA, Rudolf Husar, PI July 2004 Trajectory Browser Kitty: Simple CATT CATT Transport Analyzer
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Combined Aerosol Trajectory Tool, CATTStatus Report on Tools Development and Use
Project supported by the Inter-RPO Data Analysis Workgroup
Project Manager: Sirpil Kayin, MARAMA
Technical Project Officer: Rich Poirot, Vermont DEP
Project performed by CAPITA, Rudolf Husar, PI
July 2004
Trajectory Browser Kitty: Simple CATT CATT Transport Analyzer
Next Process
Next Process
Aerosol Data
Collection IMP. EPA
Aerosol Sensors
Integration VIEWS
Integrated AerData
AEROSOL
Weather Data
Assimilate NWS
Gridded Meteor.
Trajectory ARL
Traject.Data
TRANSPORT
TrajData Cube
Aggreg. Traject.
AerData Cube
CATT
Aggreg.Aerosol
CATT-In CAPITA
CATT-In CAPITA
New CATT Components:
Chemical filter
Accomplished through queries to chemical data sets.
The output a list of “qualified” dates for a specific location (s).
Trajectory aggregator
Receives the list of dates for a specific location
Performs the trajectory/restime aggregation
Yield transport pattern for specific receptor location and chemical filter conditions.
• All the VIEWS chemical parameters available for filtering
• Filter settable as Parameter-Operator-Threshold, e.g. SOILf >20 or SO4<5
CATT – Combined Aerosol Trajectory Aggregator
Differing TrajPoint weight combinations• These were all created using the CATT Aerosol Trajectory Aggregator
Uncertainty potential further away
The Role of Age Weighing: Example: Fine SOIL Transport Probability map to Shenandoah, July
Age weight factor = 1
Hi weighed restime near the receptor
Factor ~ square root of age
Weighed restime uniform along path
Recommended (why? Don’t know)
Factor ~ age
Hi weighed restime far from receptor
Transport Probability Metrics
• The transport metric is calculated from two residence time grids, one for all trajectories and another for trajectories on selected (filtered days). Both residence time grids are normalized by the sum of all resdence times in all grid cells:
pijf=rij/ rij pij
a=rij/ rij
• pijf, is the filtered and pij
a is the unfiltered residence time probability
that an air masses passes through a specific grid. There is a choice of transport probability metrics:
• The Incremental Residence Time Probability (IP) proposed by Poirot et al., 2001 is obtained by subtracting the chemically filtered grid from the unfiltered residence time grid, IRTP = pij
f - pija
• The other metric is the Potential Source Contribution Function (PSCF) proposed by Hopke et al., which is the ratio of the filtered and unfiltered residence time probabilities, PSCF = pij
f / pija
Incremental Transport Probability Analysis
• In the Incremental Probability Map, red areas represent high probability transport path• Blue zones represent the regions where a species are NOT coming from
Upper Buffalo
IMPROVE Site
Backtrajectories for top
10 percentile Soil, Jun, Jul, Aug
Backtrajectories for all days, Jun, Jul, Aug
Incremental Transport Probability, Jun, Jul, Aug
•First, the trajectories for top 10 percent SOILf are calculated•Next, the trajectories for all days are calculated•Thirdly, the
–Trajectory endpoints are gridded–Each grid is normalized to probability–The all-data grid is subtracted from filtered grid
Fine SOIL transport at decreasing concentration limit
Weight by 1 Calc high Percent days
Dust > 30 ug/m3
Dust > 1.8 ug/m3Dust > 3.7 ug/m3 Dust > 1.8 ug/m3
Dust > 15 ug/m3 Dust > 7.5 ug/m3
SO4 Multi-Site CATT
Incremental Probability Maps Upper 10 percentile, Big Bend, Jun, Jul Aug
• Incremental Transport Probabilities for Big Bend indicate southerly transport of species, except sulfate
• Conspicuously, in the summer, nitrate is also transported from the south
Incremental Probability Maps Upper 10 percentile, Brigantine, Jun, Jul Aug
Incremental Transport Probabilities for Brigantine indicate westerly transport of speciesSoil is preferentially transported from southwest; nitrate is transported from the northwest
Project Status:Extensions to the CATT Analysis Tool
1. Connectivity to VIEWS chemical datasets
• Done
2. Flexible import of pre-calculated back-trajectory data
• Done for ATAD, Nor done for HYSPLIT
3. Additional chemical filtering and trajectory aggregation algorithms
• Done for some, may add some filters
4. Spatial interpolation and rendering (contouring) of point data
• Done
5. CATT server hardware and software installation and maintenance