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R/V Ronald H. Brown Daily Summaries

Daily Summary July 31, 2002, DOY = 212

The ship spent the night making NE/SW tracts across Massachusetts Bay crossing the high SO2 power plant plume several times. Winds shifted from NW to N to W. High isoprene concentrations were detected around 0600UTC. Anthropogenic HC were more dominant by 0900UTC. NO3 appeared to be short lived with considerable structure in the NO3 and N2O5 distributions overnight. At 1200UTC the track was changed to a line from S. Boston to Gloucester Harbor. There was a strong particle number and particle light absorption gradient along the track with high concentrations at the S. Boston end. By 1600 the wind died completely. Afternoon winds were from the SE. The ship sampled in Massachusetts Bay until 2100 and then headed offshore to survey extent of coastal plume (out 50 nm from Boston), make water, and pick up fresh shrimp from the NOAA RV Gloria Michelle. Life is tough on the high seas. Plan is to sample offshore overnight and be near Portsmouth at 1200UTC Thursday.

For all plots, time is indicated in GMT. Eastern time is -5 hours.

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Location
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Temperature, Pressure
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Sea Surface Temperature, Relative Humidity
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True Wind Speed, Direction
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Ship Speed, Direction
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Relative Wind Speed, Direction

Textual information and data plots are for quicklook and overview purposes only.