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
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