HR: 0830h
AN: A51D-0704 [PDF]
TI: Surface-Level Ozone Variability in the Coastal Marine Boundary Layer Measured in the Gulf of Maine on a
Commercial Ferry During NEAQS 2002
AU: * Rawlins, W T
EM: rawlins@psicorp.com
AF: Physical Sciences Inc., 20 New England Business Center, Andover, MA 01810 United States
AU: Polex, J A
EM: jap@psicorp.com
AF: Physical Sciences Inc., 20 New England Business Center, Andover, MA 01810 United States
AU: Mulhall, P A
EM: PAM@psicorp.com
AF: Physical Sciences Inc., 20 New England Business Center, Andover, MA 01810 United States
AU: Twickler, M S
EM: mark.twickler@unh.edu
AF: Institute for the Study of Earth, Oceans and Space
University of New Hampshire, Climate Change Research Center
Morse Hall, Durham, NH 03824 United States
AU: Talbot, R W
EM: robert.talbot@unh.edu
AF: Institute for the Study of Earth, Oceans and Space
University of New Hampshire, Climate Change Research Center
Morse Hall, Durham, NH 03824 United States
AB:
As part of the New England Air Quality Study in July-August 2002, we deployed the PSI UV Ozone Photometer on a commercial
cruise ferry to measure temporal and spatial variations in ozone off the New Hampshire coast. The MV Thomas Laighton,
operated by the Isles of Shoals Steamship Company in Portsmouth, NH, provided a mobile platform from which to conduct
twice-daily measurement transects between the coastline and the Isles of Shoals area some 8 km offshore. Ozone mixing
ratios, ambient air temperature, and GPS latitude and longitude were sampled at a 1 Hz data rate (5 to 10 m spatial
resolution) via a mast and forward-facing air sampling inlet extending into the free stream above the wheelhouse of the
vessel. The measurements provide detailed views of offshore ozone buildup in two different high-ozone events ($>$100 ppbv).
The data exhibit extensive spatial variability in ozone mixing ratios for a given transect. These include frequent
small-scale depletions in ozone on the scale of tens of meters, due to titration of ozone by localized NOx emissions, and
large scale ozone depletions on the order of km, associated with the high-ozone events. In general, the off-shore ozone
concentrations are greatly elevated during periods of southwesterly winds from the polluted urban corridor, and are modulated
near the coastline by a complex sea breeze/land breeze effect.
This research was supported by the National Oceanic and Atmospheric Administration.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting