NARSTO PAC2001 Langley Site Gaseous, Particle, and Meteorological Data
Entry ID:
NARSTO_PAC2001_LANGLEY
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Summary
Abstract:
The Langley Ecole Lochiel (LEL) site was at 49.0289 N and -122.6025 W and at 90m a.s.l. The site was surrounded by hobby farms and by relatively few country roads that are lined with both coniferous and deciduous trees, with little change in terrain heights within a radius of 15 km. Nontraditional agricultural practices, such as mushroom and chicken farming and small orchards, are common within ... this radius of the site. The nearest small urban center, Langley, is
about 6 km north of the site. The site was approximately 10 km to the major
expressways of Highway 1 in Canada and I-5 in the US, and was approximately 6km
to Highway 1A in Canada. Particle sampling was done in the center of an
unobstructed field of approximately 30-50m2 about 2.5m from ground. On-site
measurements were conducted from five temporary labs
with inlets about 5m above ground.
Measurements at this site, from August 13th to 31st, were intended to address
the unknowns related to particles and ozone, with an emphasis on the transition
from the urban mix to a suburban/rural setting, particularly the impact of
agricultural sources on the particulate matter formation and evolution. Similar
to the instrumentation package at Slocan Park site, the
instrumentation package includes measurements in these five categories.
Measurements related to the precursors of fine PM and the oxidation
environment in which the fine PM is formed.
Measurements related to the characterization of fine PM and the evolution
process of PM.
Measurements related to the emission of fine PM and its precursors in the
valley.
Measurements related to the mapping of fine PM horizontal and vertical
distribution in the valley, and
Measurements of meteorological parameters in the valley.
Table 1 lists the selected measurements carried out at this site that are being
archived.
Discussion of all measurements made at the Langley site: Measurements include
detailed gas phase measurements of NOx=NOy (total and speciated), CO, O3
(Hayden et al., 2004), SO2, VOCs, OVOCs, carbonyls, NH3 (Pryor et al., 2004),
HOx, and NH3. The large collection of gaseous measurements was intended for a
detailed understanding of the oxidation environment and chemical processes in
which both O3 and secondary particulate matter are formed. For particle
chemical characterization at this site, detailed measurements were carried out
on size distributed inorganic ionic components (Anlauf et al., 2002), organic
carbon, elemental carbon, and mass from 0.05 to 18 mm AD twice a day. High-time
resolution measurements using a second AMS were carried out, that was capable
of measuring the size distribution of inorganic species and homologues of
organic species from 0.06 to 0.7 mm (Boudries et al., 2004; Alfarra et al.,
2004). Detailed organic carbon speciation measurements (Cheng et al., 2004;
McCarry et al., 2002), carbon isotope characterization (Huang et al., 2002;
Whiticar et al., 2002), sulfur isotope characterization (Norman et al., 2002),
and amorphous carbon (Sloan et al., 2002) were carried out for particles 2.5 mm
on 10-h day samples collected twice daily. The gas-particle partitioning
of semi-volatile organic compounds was studied using a Hi-cap denuder sampling
system and detailed lab organic analyses. Continuous mass measurements for
particles 2.5 mm were made using a TEOM with a diffusion dryer on the inlet.
Particle number size distributions were measured from 0.01 to 3 mm using a DMA
and an optical probe. Hygroscopic properties of particles were measured at two
particle sizes using two DMAs in tandem (Prenni et al., 2002). For NH3, HNO2,
HNO3, HCHO, and PM 2.5 mm mass measurements and the particle chemical size
distributions, more than one technique were deployed at this site. The multiple
measurements of these species provided a test of the performance and validation
of the different techniques and ensure that instrument biases were corrected.
They also provide complementing data of different characteristics, such as
better sensitivities versus time resolution. At this site, the diurnal
evolution of the boundary layer height was studied using a scanning LIDAR
(Strawbridge and Snyder, 2004a) that scanned the north, east and west
quadrants. Radiation measurements, both UV and visible, were done using an
Eppley and a CIMEL sun photometer (O'Neill et al., 2004).
Vertical distribution of certain parameters, such as O3 and meteorological
parameters, in the lower part of the atmosphere were also assessed from
tethered balloons at Langley Poppy High School, 7.9km northeast of the Langley
Ecole Lochiel site. Number size distribution between 0.25 and 10 mm were done
from ground the Langley Ecole Lochiel site. This was further aided by a
scanning lidar that based at the Langley Ecole Lochiel site.
The Pacific 2001 Air Quality Study (PAC2001) was conducted from 1 August to 31
September, 2001 in the Lower Fraser Valley (LFV), British Columbia, Canada. The
study consisted of individual research projects organized to address several
issues on ambient particulate matter and ozone that are important to policy
makers. A special issue of Atmospheric Environment [Vol. 38(34), Nov 2004]
describes specific study objectives (Li, 2004) and presents a series of results
papers from the field study. The ground sampling sites during the study were
(1) Cassiar Tunnel, (2) Slocan Park, (3) Langley Ecole Lochiel, (4) Sumas Eagle
Ridge, and (5) Golden Ears Provincial Park and aloft measurements were taken
from a Convair 580 and a Cessna 188. Selected measurement data have been
compiled for each site and aircraft and are archived as site-specific data
sets. 
Related URL
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Description:
The Langley Web Ordering Tool web site.
Description:
NARSTO QSSC web site with access to description of Data Exchange Standard
format.
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 49.16
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S: 48.41
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E: -121.94
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W: -123.6
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Temporal Coverage
Start Date:
2001-08-08
Stop Date:
2001-09-02
Personnel
Role:
INVESTIGATOR
Phone:
416-739-5731
Email:
shao-meng.li at ec.gc.ca
Role:
TECHNICAL CONTACT
Phone:
416-739-5731
Email:
shao-meng.li at ec.gc.ca
Role:
DIF AUTHOR
Phone:
757-864-8656
Fax:
757-864-8807
Email:
larc-asdc-uds at lists.nasa.gov
Contact Address:
NASA Langley Atmospheric Science Data Center
User and Data Services
NASA Langley Research Center
2 South Wright Street
Mail Stop 157D
Building 1268C
City:
Hampton
Province or State:
VA
Postal Code:
23681-2199
Country:
USA
Publications/References
Alfarra, et al., 2003. Characterization of organic aerosols in the Lower Fraser Valley during the Pacific 2001 using two Aerodyne aerosol mass spectrometers. Atmospheric Environment, this issue, doi:10.1016/j.atmosenv.01.054 Anlauf, K.G., Li, S.-M., Leaitch, W.R., Brook, J., Hayden, K., Wiebe, A., 2002. Chemical and size characteristics of particles in the Lower Fraser Valley: Pacific 2001 Field ... Study, Presentation at the American Geophysical Union Fall
Meeting, December 2002, San Francisco, CA, USA.
Brook, et al., 2003. OC and EC measurement during Pacific 2001. Presentation at
the European Aerosol Conference, 2003.
Boudries, H., et al., 2004. Chemical and physical processes controlling the
distribution of aerosols in the Lower Fraser Valley, Canada, during the PACIFIC
2001 field campaign. Atmospheric Environment, this issue,
doi:10.1016/j.atmosenv.2004.01.057.
Hayden, et al., 2004. Gaseous chemical characterization of the Lower Fraser
Valley airshed during Pacific 2001. Atmospheric Environment, this issue,
doi:10.1016/j.atmosenv.2003.12.048.
Li, Shao-Meng. 2004. A concerted effort to understand the ambient particulate
matter in the Lower Fraser Valley: the Pacific 2001 Air Quality Study.
Atmospheric Environment, Volume, 38(34), pp. 5719-5731. (Pacific 2001 Special
Issue)
McCarry, B.E., Rosati, M., Yang, R., 2002. PAH and nitro-PAH analyses of air
particulate material collected during Pacific 2001 study. Presentation at the
Symposium on Atmospheric Aerosols and Pacific 2001 Field Study, 85th CSC
Conference, Vancouver, Canada, June 1-5, 2002.
Norman, A.L., Belzer, W., Barrie, L., Wang, D., 2002. Sulphate in PM2.5:
results from the Pacific 2001 field campaign. Presentation at the American
Geophysical Union Fall Meeting, December 2002, San Francisco, CA, USA.
Pryor, et al., 2004. Spatial and temporal variability of reduced nitrogen
concentrations in the Fraser Valley. Atmospheric Environment, this issue,
doi:10.1016/j.atmosenv.2003.12.045.
Wang, D., Fuentes, J.D., Dann, T., Travers, D., Connolly, T., Arktas, Y., 2002.
Non-methane hydrocarbon measurements in the Vancouver region during Pacific
2001. Presentation at the American Geophysical Union Fall Meeting, December
2002, San Francisco, CA, USA.
Creation and Review Dates
DIF Creation Date:
2005-11-29
Last DIF Revision Date:
2006-03-22
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