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Carbon Dioxide Monitoring Update Dustin Goto Monitoring and Laboratory Division California Air Resources Board Carbon Dioxide Monitoring Update Dustin Goto Monitoring and Laboratory Division California Air Resources Board AMTAC April 12, 2011 1

Recap n n The California Global Warming Solutions Act of 2006 (AB 32) requires Recap n n 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 CO 2 analyzers at our Roseville, Fresno, and Bakersfield air monitoring stations. n Intended as a pilot study to get a CO 2 baseline. n Ended the pilot study in February 2011. 2

THERMO 410 i CO 2 Analyzer n n n Uses infrared spectroscopy as principle THERMO 410 i CO 2 Analyzer n n n 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 CO 2 free zero air for calibrations 3

Data n Mean CO 2 concentrations: n Roseville 424 PPM n Fresno 428 PPM Data n Mean CO 2 concentrations: n Roseville 424 PPM n Fresno 428 PPM n Bakersfield 441 PPM n Mauna Loa Observatory 390 PPM 4

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Where do we go from here? n n Finalizing data. Writing final report intended Where do we go from here? n n 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 ringdown spectroscopy) with the Picarro G 1301. The Picarro analyzers measure CH 4 and CO 2. 7

Questions 8 Questions 8

Contact Information n Dustin Goto dgoto@arb. ca. gov (916) 327 -4757 9 Contact Information n Dustin Goto [email protected] ca. gov (916) 327 -4757 9