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UpdatePI-SWERL Sampling on
Owens Lake
UpdatePI-SWERL Sampling on
Owens Lake
Maarten Schreuder, Air Sciences Inc.3/17/2010
Maarten Schreuder, Air Sciences Inc.3/17/2010
OutlineOutline
• Background• Updates to Sampling Plan
Field Sampling Calibration
• Schedule for Current Dust Season
• Background• Updates to Sampling Plan
Field Sampling Calibration
• Schedule for Current Dust Season
Background - TimelineBackground - Timeline
07/08 - PI-SWERL first discussed with Panel05/09 - First test on Owens Playa09/09 - Field demonstration with Panel and
District11/09 - Panel§ recommended development of
PI-SWERL sampling plan12/09 - Draft sampling plan presented to
Panel and District
1/10 - Updated sampling plan distributed to Panel and District
07/08 - PI-SWERL first discussed with Panel05/09 - First test on Owens Playa09/09 - Field demonstration with Panel and
District11/09 - Panel§ recommended development of
PI-SWERL sampling plan12/09 - 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
Updates to Sampling Plan-Field Measurements-
Updates to Sampling Plan-Field Measurements-
Field Sampling ApproachesField Sampling Approaches
• Routine sampling• Event sampling• Instrument comparison
• Routine sampling• Event sampling• Instrument comparison
Routine SamplingRoutine 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
• 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
Routine SamplingRoutine Sampling
Study Area 1
Study Area 3
Event SamplingEvent 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)
• 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)
Event SamplingEvent Sampling
Instrument ComparisonInstrument Comparison
PI-SWERL District wind tunnel
MRI wind tunnel
Instrument ComparisonInstrument 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)
• 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)
Updates to Sampling Plan-Calibration-
Updates to Sampling Plan-Calibration-
Calibration of OGSCalibration 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
• 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
Calibration of DustTrakCalibration 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
• 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
Schedule for Current Dust Season
Schedule for Current Dust Season
Original Time ScheduleOriginal Time Schedule
Task Planning Data Collection
Data Analysis
Report Preparation
Routine Sampling
3/2010
Through 8/2010
10/2010 12/2010
Event Sampling
Through 6/2010
Instrument Cross Comparison
6/2010
PI-SWERL Calibration
Through 7/2010
Updated ScheduleUpdated 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.
• 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.
Questions