We report tropospheric (altitude >5 km) observations of CO2, CO, CH4, and light hydrocarbons (C2-C4) over the latitude range from 90¿N to 23¿S recorded onboard the NASA DC-8 aircraft during the winter 1992 Second Airborne Arctic Stratosphere Expedition (AASE-II). Mixing ratios for these species exhibited significant north-south gradients with maximum values in subpolar and arctic regions and minima over the southern tropics. At latitudes >40¿N, the mixing ratios of most species increased significantly over the course of the 3-month measurement period. Also at high northern latitudes, the variations of all relatively long-lived reactive carbon species were linearly correlated with fluctuations of CO2 with CO, CH4, C2H6, C2H4, C3H8, and n-C4H10 exhibiting average enhancement ratios in terms of ppbv(X)/ppmv(CO2) of 13.8, 8.4, 0.21, 0.075, 0.085, and 0.037, respectively. ¿ American Geophysical Union 1993