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Updates to PI-SWERL Sampling and Calibration Plan for Owens Lake - March 2010

This document outlines the progress and updates to the PI-SWERL sampling plan for Owens Lake as of March 2010. It includes background information on previous discussions and tests, details of routine and event sampling approaches, calibration methods for Optical Gate Sensors (OGS) and DustTrak, and a revised schedule for the current dust season. The document highlights key strategies for efficient collaboration with the District to ensure effective field sampling and instrument calibration.

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Updates to PI-SWERL Sampling and Calibration Plan for Owens Lake - March 2010

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  1. UpdatePI-SWERL Sampling on Owens Lake Maarten Schreuder, Air Sciences Inc. 3/17/2010

  2. Outline • Background • Updates to Sampling Plan • Field Sampling • Calibration • Schedule for Current Dust Season

  3. Background - Timeline • 07/08 - PI-SWERL first discussed with Panel • 05/09 - First test on Owens Playa • 09/09 - Field demonstration with Panel and District • 11/09 - Panel§ recommended development of PI-SWERL sampling plan • 12/09 - Draft sampling plan presented to Panel and District • 1/10 - Updated sampling plan distributed to Panel and District § Expert Panel Position Statement, Nov. 10, 2009

  4. Updates to Sampling Plan-Field Measurements-

  5. Field Sampling Approaches • Routine sampling • Event sampling • Instrument comparison

  6. Routine Sampling • Study Area 1 and Study Area 3 • Monthly sampling • Sampling time: 1 day per area • Up to 25 sampling points per area • Approx. one sample per 15 acres (~250x250 m) • Co-locate several points with District Sensits

  7. Routine Sampling Study Area 1 Study Area 3

  8. Event Sampling • Sampling across borders of delineated areas • Sampling within 5 days of wind event • Sampling time: 1 day per area • Up to 25 sampling points per area • Two or three transects per area • Co-locate several points with District Sensits (where possible)

  9. Event Sampling

  10. Instrument Comparison District wind tunnel PI-SWERL MRI wind tunnel

  11. Instrument Comparison • Recommended by Panel • Two or three sampling locations, representing different soil/surface types • Main criteria: • Surface emissivity (high/intermediate/low) • Accessibility • Sampling time: up to 1 day per site • Instruments: • MRI tunnel (N=4) • District tunnel (N=4) • PI-SWERL (N=8)

  12. Updates to Sampling Plan-Calibration-

  13. Calibration of OGS • Need: Conversion of Optical Gate Sensors (OGS) output to a mass-based sand flux • Several options available: • Use recent progress by DRI/DustQuant in calibrating OGS output to total sand mass • Calibrate OGS in PI-SWERL to mass-based sand flux in MRI tunnel • Place OGS devices inside the MRI tunnel for real-time calibration • Preferred option to be determined

  14. Calibration of DustTrak • Need: Calibration factor(s) for DustTrak specific to Owens Lake material • Two or three representative soil types • 1O option: Procedure proposed by Jack Gillies§ • 2O option: Compare DustTrak filter mass with real-time output § Expert Panel Position Statement, March 12, 2010

  15. Schedule for Current Dust Season

  16. Original Time Schedule

  17. Updated Schedule • Utilize remainder of current dust season for planning and coordination. • Realistic schedule: • Instrument calibration: starting Fall 2010 • Cross comparison: 2010-2011 dust season • Field sampling: 2010-2011 dust season • Collaboration with the District would speed the process and lead to a more acceptable end product.

  18. Questions

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