NEAQS 2004

Meteorological summary for Gulf of Maine and northern coastal New England

 

Wayne M. Angevine

 

1 August

 

March 17, 2005


General

Low level winds shifted from SSW to SW but remained relatively strong (15-20 kts) near shore. Fog was present again in the Gulf of Maine.  Mid- to high-level cloud was present over the coast and Gulf.

Soundings from the ship at 0500, 1100, 1700, and 2300 UTC showed a strongly statically stable marine boundary layer ~100 m deep.  A near-neutral intermediate layer above extended up to a sharp inversion at ~700 m in the 0500 UTC sounding only.  Winds aloft were more westerly than near the surface.

Sounding winds

0500 UTC

1100 UTC

1700 UTC

2300 UTC

100 m speed, m/s

10.6

10.0

11.7

12.5

100 m direction

230

210

215

220

500 m speed

18.0

13.7

11.7

9.8

500 m direction

240

245

240

250

1000 m speed

19.5

15.9

12.4

9.4

1000 m direction

250

255

250

270

2000 m speed

16.1

16.9

14.2

9.6

2000 m direction

235

235

240

255

 

Ozone and CO

Ozone and CO were low at the ship.  There was a broad peak of ozone ~35-40 ppb between 16 and 22Z.  Footprints suggest that there should have been urban influence at the ship throughout the day.

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

 

Footprints

Figure 2:  FLEXPART footprint for 1734-1806 UTC 1 August

Ship track

Figure 3:  Ozone along the ship track

Figure 4:  Wind direction along the ship track