THE PROPOSED RESEARCH HEREIN RESPONDS TO NASA SOLICITATION A.23: FIRE IMPACTS ON REGIONAL EMISSIONS AND CHEMISTRY (FIRECHEM). THIS STUDY OFFERS THE OPPORTUNITY TO FURTHER ADVANCE NASA S GOALS RELATED TO EMISSIONS FROM WILD FIRES AND THE RESULTANT EFFECTS ON ATMOSPHERIC COMPOSITION AND AIR QUALITY. THIS PROPOSAL DISCUSSES A 3-YEAR EFFORT BY A GROUP OF SCIENTISTS AT THE UNIVERSITY OF COLORADO (CU) LED BY CO-PI S DRS. DIRK RICHTER PETTER WEIBRING AND ALAN FRIED TO PARTICIPATE IN FIRECHEM. THESE SCIENTISTS PROPOSE THE FOLLOWING TWO PRIMARY OBJECTIVES: 1) ACQUISITION OF HIGH QUALITY ACCURATE FAST HIGHLY SENSITIVE DC-8 MEASUREMENTS OF FORMALDEHYDE (CH2O) METHANOL (CH3OH) ETHYLENE (C2H4) AND ETHANE (C2H6) FOUR GASES OF IMPORTANCE TO FIRECHEM AND DIRECTLY EMITTED OR PHOTOCHEMICALLY PRODUCED DURING WILDFIRE EVENTS; AND 2) DETAILED FOLLOW-UP ANALYSES IN COLLABORATION WITH ATMOSPHERIC MODELERS IN THE INTERPRETATION OF THEIR DATA. TO ACCOMPLISH THIS THE CU TEAM PROPOSES TO DEPLOY THEIR AIRBORNE-PROVEN STATE-OF-THE-ART CAMS (COMPACT ATMOSPHERIC MULTISPECIES SPECTROMETER) INSTRUMENT SUITE. CAMS-1 HAS SUCCESSFULLY ACQUIRED AIRBORNE MEASUREMENTS OF CH2O SINCE 2012 AND MOST RECENTLY SIMULTANEOUS MEASUREMENTS OF CH2O AND ETHANE (C2H6) DURING NASA AND NSF-SPONSORED CAMPAIGNS IN 2014 AND 2016. THE RECENTLY DEVELOPED CAMS-2 SPECTROMETER HAS SUCCESSFULLY ACQUIRED ETHANE MEASUREMENTS IN AUTONOMOUS OPERATION ONBOARD THE NASA KING AIR AIRCRAFT DURING THE 2016 AND 2017 ACT-AMERICA (ATMOSPHERIC CARBON AND TRANSPORT-AMERICA) CAMPAIGNS. FOR FIRECHEM BOTH FUNDAMENTAL CORE INSTRUMENTS WILL BE DEPLOYED WITH SOFT- AND HARDWARE UPGRADES TO IMPROVE INSTRUMENT RESPONSE TIME AND LASER RECONFIGURATION TO ACCESS THE FOUR SPECIFIC AFOREMENTIONED TARGET GASES. CAMS-1 WILL BE RECONFIGURED TO MEASURE CH2O AND CH3OH WITH THE SAME PAIR OF LASERS PRESENTLY UTILIZED. AS THE ABSORPTION CELL PATH LENGTH WILL NOT BE CHANGED SIMULTANEOUS CH2O AND CH3OH WILL BE ACQUIRED WITH OUR PRESENT 1-HZ TIME RESOLUTION AND WITH ONLY MINOR SOFTWARE MODIFICATIONS. IN THE CASE OF CAMS-2 THE PRESENT DIFFERENCE FREQUENCY GENERATION (DFG) ETHANE LASER PAIR WILL BE REPLACED BY TWO COMMERCIALLY AVAILABLE INTERBAND QUANTUM CASCADE LASERS (ICLS) TO ACCESS ETHANE AND ETHYLENE ABSORPTION FEATURES AND A NEW SMALL VOLUME MULTI-PASS ABSORPTION CELL WILL BE EMPLOYED IN ORDER TO ACHIEVE 5-HZ RESPONSE TIMES. THIS 3-YEAR EFFORT WILL COMMENCE WORK IN LATE 2017 STARTING WITH UPGRADES TO THE CAMS-1 AND MODIFICATIONS TO THE CAMS-2 SPECTROMETERS. UPGRADES AND RIGOROUS INSTRUMENT TESTS WILL BE PERFORMED THROUGHOUT 2018 AND EARLY 2019 INCLUDING: SOFTWARE UPGRADES CALIBRATIONS ZERO AIR SCRUBBING TESTS RESPONSE TIME MEASUREMENTS ASSESSMENT OF INSTRUMENT PRECISION ACCURACY AND INTERFERENCES TO NAME A FEW. THIS EFFORT WILL ALSO INCLUDE DETAILED DOCUMENTATION AND ENGINEERING ANALYSIS FOR FLIGHT OPERATION ON THE NASA DC-8. THE INSTRUMENTS WILL BE READY FOR AIRBORNE DEPLOYMENT IN EARLY 2019. OUR GROUP WILL PARTICIPATE IN ALL FIRECHEM ACTIVITIES INCLUDING: INTEGRATION/UPLOAD ON THE NASA DC-8 AIRCRAFT TESTS FLIGHTS OPERATION OF CAMS-1 AND CAMS-2 DURING THE FIRECHEM STUDY IN 2019 POST MISSION DATA QUALITY CONTROL AND SUBMITTAL FOLLOWED BY DETAILED ANALYSIS AND PUBLICATIONS.