The Nittany Atmospheric Trailer and Integrated Validation Experiment (NATIVE)and Pollution Events at Yellowknife, NT, During the Summer 08 ARCTAS Campaign
The Nittany Atmospheric Trailer and Integrated Validation Experiment (hereafter NATIVE) is designed for
mobile research into air quality, pollution transport, and satellite validation. It is equipped with surface trace gas
sensors and a suite of meteorological instruments, as well as several sun photometers and an aerosol lidar.
NATIVE also serves as a ground station for ozonesonde launches. During the ARCTAS field campaign, NATIVE
was located in Yellowknife, NT (62.48N, 114.48W) where we conducted ozonesonde launches and trace gas
measurements of local pollution and forest fire impacts on local air quality and tropospheric ozone. We
combine meteorological data with trace gas measurements to better understand the fire and pollution
dynamics that occur during the summer of 2008 in Yellowknife, NT. On June 29, elevated pollution levels and
significant smoke were observed at the measurement location. This may be related to forest fires sparked by a
recent thunderstorm. Additionally, back trajectory analysis suggests that pollutants from fires were transported
over long distances in the free troposphere, which were entrained into the boundary layer. On July 1, with no
local fires, elevated pollution levels are again observed in Yellowknife, which may be related to more local
sources. During this event, ozone mixing ratios increased from ∼10 to ∼20 ppb over the course of
Reconstructing ozone chemistry during transport of boreal fire plumes over Northern Pacific with satellite, aircraft measurement, and modeling
We examine tropospheric ozone production and loss in Siberian fire plumes transported over Northern Pacific during spring 2008 ARCTAS campaign using collocated O3 and CO profiles as measured by the Tropospheric Emission Spectrometer (TES) and ozone from the Airborne UV Differential Absorption Lidar (DIAL). High CO concentrations, over 200 ppbv, are observed in fire plumes as well as O3 concentrations ranging from less than 30 to more than 100 ppbv. These variations in ozone are linked to aerosols amounts as well as aircraft measurements of ozone precursors
Study of Stratospheric Ozone Intrusions by TES Observations and GEM-FLEXPART Model
Simulation results of the FLEXPART model, using the output of the Canadian Global Environmental Multiscale (GEM) model as an air tracer, have been used to indicate the occurrence of stratosphere ozone intrusions, as an analysis tool for ozonesonde, satellite and other observations, as well as air quality model results. Observations by the Tropospheric Emission Spectrometer (TES) on board NASA's Aura satellite are ideal for studying the dynamic change of ozone profiles globally. We explore the temporal and spatial evolution of stratosphere ozone intrusion events over North America, with GEM-FLEXPART model simulations and TES observations, during ozonesonde campaigns in 2006 and 2008, when strong stratosphere ozone intrusions are indicated by ozonesonde observations. TES observations and the GEM-FLEXPART results together provide a continental-scale three-dimensional picture of stratosphere-troposphere-exchange (STE), capturing the vertical and horizontal structure, as well as the time-evolution of STE.
An ozone climatology for INTEX and ARCTAS from IONS ozonesondes
The IONS-04, IONS-06 and ARC-IONS ozone sounding campaigns over North America in 2004, 2006 and 2008 obtained approximately 1400 profiles, in five series of coordinated, closely-spaced (typically daily) launches. Although this coverage is unprecedented, it is still somewhat sparse in its geographical spacing. Here we use forward and back-trajectory calculations for each sounding to map ozone measurements to several other locations, and so to fill in the spatial domain. This is possible because the lifetime of ozone in the troposphere is of the order of weeks. The trajectory-mapped ozone values show reasonable correlation with estimates from OMI and, where they overlap, to each other. The resulting climatology for the INTEX and ARCTAS periods may be useful to other researchers.
Lidar Measurements Ozone Depletion Events in the Boundary Layer above the Arctic Ocean
A differential absorption lidar (DIAL) was installed on the Amundsen Icebreaker for measuring vertical profiles of ozone above the frozen Arctic Ocean. The lidar is based on stimulated Raman Scattering (SRS) of 266 nm laser energy in CO2 to generate three closely spacedwavelengths (287 nm, 289 nm, 299 nm) in the UV. The differential absorption between the shorter and longer wavelengths is employed to derive the ozone density. The measurement campaign in February and March of 2008 was part of the OASIS IPY project and the focus was to study surface level ozone depletion events (ODEs) that occur after polar sunrise. Continuous measurements were achieved thoughout most of March 2008 and three ODEs were observed. It was found that the ozone depletion extended from the surface to heights of up to 600m. There were no isolated patches of ozone depleted air that were not connected to the surface.