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