Mar 9:  Second Hong Kong Local Flight

Flight 10 Summary  – Hong Kong Local 2

A series of in-progress walls were planned along 20N latitude to the east of Hong Kong.  Model predictions indicated aged post-frontal outflow in the middle troposphere should be encountered.

Results: 

Model predictions were found to be accurate for the middle troposphere.  The P-3B encountered polluted outflow between 7.5-12.5Kft.  Clean conditions were encountered above 12.5Kft.  Pollution encountered in the boundary layer was not predicted, but appeared to be due to ship traffic.  Highly correlated behavior between NOy, SO2, and particulates was observed along with several ship sightings.  NOx/NOy ratios indicated emissions probably too fresh to have been transported from the Asian continent.