How i spent my summer vacation
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How I Spent My Summer Vacation. By: Dylan Boyd High School Math Teacher and Harvard RET Participant. Modeling the Across North America Tracer Experiment (ANATEX) for purposes of evaluating the accuracy of the STILT atmospheric particle transport model. Who cares if STILT’s accurate or not?.

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How I Spent My Summer Vacation

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How I Spent My Summer Vacation

By: Dylan Boyd

High School Math Teacher and Harvard RET Participant


Modeling the Across North America Tracer Experiment (ANATEX) for purposes of evaluating the accuracy of the STILT atmospheric particle transport model


Who cares if STILT’s accurate or not?

  • Environmental applications

    • Ecology issues

    • Pollution issues

  • Emergency applications

  • Military applications


What is STILT?


What is STILT?


What is STILT?

  • Transport Model


What is STILT?

  • Transport Model


What is STILT?

  • Lagrangian

  • Transport Model


What is STILT?

  • Lagrangian

  • Transport Model


What is STILT?

  • Stochastic

  • Lagrangian

  • Transport Model


What is STILT?

  • Stochastic

  • Lagrangian

  • Transport Model


What is STILT?

  • Stochastic

  • Time

  • Inverted

  • Lagrangian

  • Transport Model


What is ANATEX?

  • Across North America Tracer Experiment (1987)

  • Three tracers released from two locations

  • 33 releases over three months

  • 77 ground sample sites

  • 5 towers

  • 12 “remote” sites


ANATEX Tracer Release

  • Perfluorocarbons (PMCH, PTCH, oPDCH)

  • Inert

  • Nondepositing

  • Nontoxic

  • High degree of analytical detection sensitivity

  • Used previously in CAPTEX, and subsequently in ETEX and TRANSALP


ANATEX Tracer Sampling

  • Programmable Atmospheric Tracer Sampler (PATS)

  • Constant mass flow pump draws air through sample tubes packed with adsorbent

  • Sample tubes were desorbed by resistance heating of the tubes

  • Analyses performed by gas chromatography-electron capture


European Tracer Experiment (ETEX)

  • Two releases

  • 170 ground sampling sites

  • Sampling period of 72 hours


Scientific importance of ANATEX


Scientific importance of ANATEX


My Work

  • Simulate the ANATEX experiment with the STILT model

  • Render the ANATEX data and the STILT output into comparable formats

  • Perform analyses to evaluate the modeling accuracy of STILT


My Work

  • Simulate the ANATEX experiment with the STILT model

  • Render the ANATEX data and the STILT output into comparable formats

  • Perform analyses to evaluate the modeling accuracy of STILT


My Work

  • Simulate the ANATEX experiment with the STILT model

  • Render the ANATEX data and the STILT output into comparable formats

  • Perform analyses to evaluate the modeling accuracy of STILT


My Work

  • Simulate the ANATEX experiment with the STILT model

  • Render the ANATEX data and the STILT output into comparable formats

  • Perform analyses to evaluate the modeling accuracy of STILT


My Work

  • Simulate the ANATEX experiment with the STILT model

  • Render the ANATEX data and the STILT output into comparable formats

  • Perform analyses to evaluate the modeling accuracy of STILT


Dynamic Grid Sizing


Dynamic Grid Sizing


Dynamic Grid Sizing


Dynamic Grid Sizing


Shifted Plumes

Observed Plume

Simulated Plume

*note different concentration scales

(simulation should be multiplied by factor of 10!!!)


log10([fL/L])

log10([fL/L])

Results


log10([fL/L])

log10([fL/L])

Results


log10([fL/L])

log10([fL/L])

Results


log10([fL/L])

log10([fL/L])

Results


1:1 line

Regression

line


Closing Remarks


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