Mar 10:  Third Hong Kong Local Flight

Flight 11 Summary  – Hong Kong Local 3

A flight southward over the South China Sea was planned to look at outflow during a quiescent period.  Model predictions indicated clean condition in the free troposphere with some pollution trapped in the marine boundary layer.

Results:

As expected, clean conditions prevailed over much of the flight, and pollution in the boundary layer was encountered at latitudes consistent with outflow from Manila in the Phillippines.  Differences in boundary layer measurements on the outbound and return legs were suggestive of some photochemical evolution with slightly elevated ozone mixing ratios well correlated with NOy and particulates.  Some ship encounters in the boundary layer were also noted in the data.