NEAQS 2004

Meteorological summary for Gulf of Maine and northern coastal New England

Wayne M. Angevine

15 July

February 8, 2006

General

(From PSU synoptic summary): Coastal low level winds were affected by low pressure off of Cape Cod at the beginning of the period. This brought E-NE winds to most coastal locations. As this low pressure moved eastward and weakened, winds became more influenced by the low pressure through NY. Winds weakened and then returned SE, and re-strengthened from the thermal contrast at the coast. At the ship position off Cape Ann, the winds veered from NE through S to become SW by approximately 0000Z 16 July. Temperatures under cloudy skies had a hard time reaching the low 20’s (C) across most of New England. Areas of southern New England, where dew points were highest, reached the mid 20’s during the period.

Temperature summary:

ID/HI/LOW

KPSM/21/15 (Pease)

44005/17/14 (Gulf of Maine Buoy)

Ozone and CO

Only modest levels of CO and ozone were observed at the ship, with the highest levels at the end of the day after the wind shift allowed influence from the urban areas.

Figure 1: Maximum 1-h surface ozone from EPA AIRNOW

Footprints

Figure 2: FLEXPART footprint for 1150-1250 UTC

Figure 3: FLEXPART footprint for 2119-2219 UTC

Ship track

Note that the ship was stationary northeast of Cape Ann (42.89N 70.61W) from ~0200-1700 UTC and closer in (42.74N 70.66W) from ~2000 UTC through the end of the day.

Figure 4: CO along the ship track

Figure 5: Ozone along the ship track

Figure 6: Wind direction along the ship track