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Carbon Dioxide Monitoring Update
Dustin GotoMonitoring and Laboratory DivisionCalifornia Air Resources BoardAMTACApril 12, 2011
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Recap The California Global Warming Solutions Act of
2006 (AB 32) requires the California Air Resources Board to report and verify the statewide greenhouse gas emissions inventory.
As an initial response, we installed CO2 analyzers at our Roseville, Fresno, and Bakersfield air monitoring stations.
Intended as a pilot study to get a CO2 baseline.
Ended the pilot study in February 2011.
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THERMO 410i CO2 Analyzer Uses infrared spectroscopy as principle of
operation.
PROS: easy to use/read interface, easily integrated into existing monitoring stations, stable
CONS: nitrogen purge cylinder, need CO2 free zero air for calibrations
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Data Mean CO2 concentrations:
Roseville 424 PPM
Fresno 428 PPM
Bakersfield 441 PPM
Mauna Loa Observatory 390 PPM
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CO2 Concentration at Fresno Air Monitoring Station
350
370
390
410
430
450
470
490
510
530
550
4/1/
2009
5/1/
2009
6/1/
2009
7/1/
2009
8/1/
2009
9/1/
2009
10/1
/200
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11/1
/200
9
12/1
/200
9
1/1/
2010
2/1/
2010
3/1/
2010
4/1/
2010
5/1/
2010
6/1/
2010
7/1/
2010
8/1/
2010
9/1/
2010
10/1
/201
0
11/1
/201
0
12/1
/201
0
1/1/
2011
2/1/
2011
Date
CO
2 C
on
cen
trat
ion
(P
PM
)
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Fresno Diurnal CO2 Concentration
390
400
410
420
430
440
450
460
470
480
490
500
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Hour
CO
2 C
on
cen
trat
ion
(P
PM
)
CO2 Regression July 2009
CO2 Regression December 2009
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Where do we go from here?
Finalizing data. Writing final report intended for journal publication
looking at seasonal and diurnal patterns. Draft of report for peer review this summer. Evaluate a rural network away from localized
sources using new technology (cavity ring-down spectroscopy) with the Picarro G1301. The Picarro analyzers measure CH4 and CO2.
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Questions
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