We use aircraft observations of Asian outflow from the NASA TRACE-P mission over the NW Pacific in March-April, 2001 to quantify the export efficiency of black carbon (BC) aerosol during lifting to the free troposphere, as limited by scavenging from the wet processes (warm conveyor belts, convection) associated with this lifting. Our estimate is based on the enhancement ratio of BC relative to CO in Asian outflow observed at different altitudes, and normalized to the enhancement ratio observed in boundary layer outflow (0-1 km). We similarly estimate export efficiencies of sulfur oxides (SO_x = SO₂(g) + SO₄^2-) and total inorganic nitrate (HNO₃^T = HNO₃(g) + NO₃^-) for comparison to BC. Figure shows mean vertical profiles of export efficiency (left) and normalized export efficiency (right) in Asian outflow for BC (squares), SO_x (diamonds), and HNO₃^T (asterisks). Normalized export efficiencies for BC are 0.63 - 0.74 at 2 - 4 km altitude and 0.27 - 0.38 at 4 - 6 km. Values are higher than for SO_x (0.48 - 0.66) and HNO₃^T (0.29 - 0.62), at least at 2 - 4 km, implying that BC is scavenged in wet updrafts but not to the extent of sulfate or nitrate. Simulation of the TRACE-P period with a global 3-D model (GEOS-CHEM) indicates that a model time scale of 1±1 days for conversion of fresh hydrophobic to hydrophilic BC provides a successful fit to the export efficiencies observed in TRACE-P. The resulting mean atmospheric lifetime of BC is 5.8±1.8 days, the global burden is 0.11±0.03 Tg C, and the decrease in Arctic snow albedo due to BC deposition is 3.1±2.5%. To learn more, click here: [Park et al., 2004]