Tracking elevated pollution layers with a newly developed hyperspectral Sun/Sky spectrometer (4STAR): Results from the TCAP 2012 and 2013 campaigns

Total columnar water vapor (CWV), nitrogen dioxide (NO 2 ), and ozone (O 3 ) are derived from a newly developed, hyperspectral airborne Sun‐sky spectrometer (4STAR) for the first time during the two intensive phases of the Two‐Column Aerosol Project (TCAP) in summer 2012 and winter 2013 aboard the DOE G‐1 aircraft. We compare results with coincident measurements. We find 0.045 g/cm 2 (4.2%) negative bias and 0.28 g/cm 2 (26.3%) root‐mean‐square...