regional and local variations in atmospheric aerosols using ground-based sun photometry during distributed regional aerosol gridded observation networks (dragon) in 2012
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2016
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Abstract
Aerosol
mass concentrations are affected by local emissions as well as
long-range transboundary (LRT) aerosols. This work investigates regional and
local variations of aerosols based on Distributed Regional Aerosol Gridded
Observation Networks (DRAGON). We constructed DRAGON-Japan and DRAGON-Osaka in
spring of 2012. The former network covers almost all of Japan in order to
obtain aerosol information in regional scale over Japanese islands. It was
determined from the DRAGON-Japan campaign that the values of aerosol optical
thickness (AOT) decrease from west to east during an aerosol episode. In
fact, the highest AOT was recorded at Fukue Island at the western end of the
network, and the value was much higher than that of urban areas. The latter
network (DRAGON-Osaka) was set as a dense instrument network in the
megalopolis of Osaka, with a population of 12 million, to better understand
local aerosol dynamics in urban areas.
AOT was further measured with a mobile sun photometer attached to a car. This transect information showed that aerosol concentrations rapidly changed in time and space together when most of the Osaka area was covered with moderate LRT aerosols. The combined use of the dense instrument network (DRAGON-Osaka) and high-frequency measurements provides the motion of aerosol advection, which coincides with the wind vector around the layer between 700 and 850 hPa as provided by the reanalysis data of the National Centers for Environmental Prediction (NCEP).
AOT was further measured with a mobile sun photometer attached to a car. This transect information showed that aerosol concentrations rapidly changed in time and space together when most of the Osaka area was covered with moderate LRT aerosols. The combined use of the dense instrument network (DRAGON-Osaka) and high-frequency measurements provides the motion of aerosol advection, which coincides with the wind vector around the layer between 700 and 850 hPa as provided by the reanalysis data of the National Centers for Environmental Prediction (NCEP).
| Reference Key |
sano2016atmosphericregional
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|---|---|
| Authors | ;I. Sano;S. Mukai;M. Nakata;B. N. Holben |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-14795-2016
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| URL | |
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