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R/V Ronald H. Brown Daily Summaries

Daily Summary August 7, 2002, DOY = 219

The ship rounded Nantucket shoals at 0400 UTC and headed toward Delaware Bay. Winds were 65 degrees off the starboard bow, providing good air for sampling. True winds were NW at 14 m/s at 0600 decreasing to N at 8 m/s by 1200 UTC. Elevated SO2 concentrations between 0530 and 0630 may have been from a Boston Plume. Ozone concentrations from 0530-1300 ranged from 20-25 ppb. There was an increase in O3 concentrations beginning at 1130 peaking at 45ppb at 1600. Aerosol light scattering was primarily from supermicrometer seasalt. At 1430 particle number concentrations, SO2 and scattering rose briefly hinting of some continental air. At 1930 UTC, CN, aerosol light absorption, and SO2 began increasing. Winds were from the NNW at 5 m/s with an upwind bearing to NYC. Ozone (45ppb) and light absorption (2.5Mm-1) stayed constant through the remainder of the day. SO2 (300-800 ppt) and CN (5000-10000 cc-1) concentrations remained elevated with varying concentrations. There was no sign of the continental plume in the aerosol light scattering data. Scattering decreased late in the day with the decreasing wind speeds.

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.