In situ measurements of HCHO are shown for the flight of 2 June on the NASA DC-8 during the Deep Convective Clouds and Chemistry (DC3) campaign in 2012. The top shows 1 s HCHO and GPS altitude. The lower portions are expanded views of the boundary layer (BL) leg and the upper tropospheric (UT) leg. The fast response to large changes in ambient HCHO are evident in the BL leg. The sensitivity (better than 20 pptv/s) is evident in the UT leg.
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