Development of an optimal calibration strategy for trace gas measurements
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Development of an optimal calibration strategy for trace gas measurements. Mark Battle (Bowdoin College) Zane Davis, Ryan Hart, Jayme Woogerd, Jacob Scheckman, Eric Sofen, Becca Perry, John Carpenter. Special thanks: Britt Stephens (NCAR), Ralph Keeling (SIO), Bill Munger (Harvard)

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Development of an optimal calibration strategy for trace gas measurements

Development of an optimal calibration strategy for trace gas measurements

Mark Battle

(Bowdoin College)

Zane Davis, Ryan Hart, Jayme Woogerd, Jacob Scheckman, Eric Sofen, Becca Perry, John Carpenter.

Special thanks: Britt Stephens (NCAR), Ralph Keeling (SIO), Bill Munger (Harvard)

Mary Lou Zeeman (Cornell/Bowdoin)

CompSust09 June 11, 2009

Funding from: DOE, Bowdoin College


Outline
Outline measurements

  • Structure of a measurement program

  • What measurements might tell us

  • Example of one such program

  • Call for help


Measuring the composition of air
Measuring the composition of air measurements

  • Precision vs. Accuracy



Measuring the composition of air1
Measuring the composition of air measurements

  • Precision vs. Accuracy

  • Differential measurements


Benefits of differential measurements
Benefits of differential measurements measurements

Initial Group

1001 Women

Final group

1002 Women


Benefits of differential measurements1
Benefits of differential measurements measurements

Absolute changes

Initial # women: 1001

Final # women: 1002

Change in women: 0.1%

Initial Group

1001 Women

Final group

1002 Women


Benefits of differential measurements2
Benefits of differential measurements measurements

Initial Group

999 Men

1001 Women

Final group

999 Men

1002 Women


Benefits of differential measurements3
Benefits of differential measurements measurements

Initial Group

999 Men

1001 Women

Final group

999 Men

1002 Women

Differential changes

Initial gender diff: 2

Final gender diff: 3

Change in gender diff: 33%


Benefits of differential measurements4
Benefits of differential measurements measurements

Absolute changes

Initial # women: 1001

Final # women: 1002

Change in women: 0.1%

Initial Group

999 Men

1001 Women

Final group

999 Men

1002 Women

Differential changes

Initial gender diff: 2

Final gender diff: 3

Change in gender diff: 33%


Measuring the composition of air2
Measuring the composition of air measurements

  • Precision vs. Accuracy

  • Differential measurements

  • Measure samples relative to “standards”







Measuring the composition of air3
Measuring the composition of air measurements

  • Precision vs. Accuracy

  • Differential measurements

  • Measure samples relative to “standards”

  • Instrumental response



Metric
Metric measurements

Precision & Accuracy

Constraints

Instrument time is precious

Standard air is precious


In summary
In summary: measurements

Optimally combine many analyses of many standards to create a virtual standard against which all samples are measured.


Connecting to the real world measuring o 2 and co 2 to constrain the carbon cycle
Connecting to the real world: measurementsMeasuring O2 and CO2to constrain the carbon cycle


Where does anthropogenic co 2 end up
Where does anthropogenic CO measurements2 end up?

Values for 2000-2006 Canadell et al. PNAS 2007



How do we know these numbers1
How do we know these numbers? measurements

  • Record CO2 emissions

  • Measure CO2 in the atmosphere


How do we know these numbers2
How do we know these numbers? measurements

  • Record CO2 emissions

  • Measure CO2 in the atmosphere

  • Measure CO2 in the oceans

  • Estimate from small-scale land measurements

  • Infer from spatial pattern and isotopes of atmospheric CO2


How do we know these numbers3
How do we know these numbers? measurements

  • Record CO2 emissions

  • Measure CO2 in the atmosphere

  • Measure CO2 in the oceans

  • Estimate from small-scale land measurements

  • Infer from spatial pattern and isotopes of atmospheric CO2

  • Measure atmospheric O2


The link between o 2 and co 2
The link between O measurements2 and CO2

CO2 = Land biota + Industry + Ocean

DO2 = Land biota + Industry


The link between o 2 and co 21
The link between O measurements2 and CO2

CO2 = Land biota + Industry + Ocean

DO2 = Land biota + Industry


The link between o 2 and co 22
The link between O measurements2 and CO2

CO2 = Land biota + Industry + Ocean

DO2 = Land biota + Industry


Google maps measurements


The equipment
The equipment measurements


The equipment1
The equipment measurements


Real data
Real data measurements


Real data1
Real data measurements


Real data2
Real data measurements


Summary
Summary measurements

  • Important questions require excellent atmospheric measurements


Summary1
Summary measurements

  • Important questions require excellent atmospheric measurements

  • Excellent measurements require intelligent weighting of experimental evidence


Summary2
Summary measurements

  • Important questions require excellent atmospheric measurements

  • Excellent measurements require intelligent weighting of experimental evidence

  • I have abundant data. Intelligence, on the other hand…

[email protected]


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