利用植物及培養皿進行大陸沙塵暴實際沉降量監測之研究(II)
Date Issued
2004
Date
2004
Author(s)
DOI
922313B002115
Abstract
At present time China sand storm particle was only monitored by an indirect
method, the PM10 monitoring system in Taiwan. However the PM10 data represent
only the total amount of fine particles and is not appropriate for expressing the
severity of China sand storm in concerned areas. For this purpose we had developed
a microscopic technique during the past two years that can detect and identify the
sand particles. A meteorological shelter with two layers of shutter at four directions
was designed for monitoring the target sand particles. Within the shelter a 2-liter
beaker was placed and a 9-cm petri dish with glass slide was adhered in the beaker.
The petri dish with glass slide was replaced with new one each for 2 –3 days.
Exposed slides were observed under dark field metallurgical light microscope.
Results showed that sand particles were differentiable from other anthropogenic
particles. Typical sand particles were shiny yellow, yellowish or brown. Those
with size 5-20 um are chosen as indicator particle species for use in counting the
deposition. In non-sand storm days the background particle number per field is less
than 10. From the results of particle counting in February and March 2003, we have
found three and three sand storm episodes at Taipei, respectively. From January
2004 to May 2004, there were totally seven episodes at Taipei. The microscopic
approach provides us a direct method for detecting or measuring the severity of sand
storm. We therefore recommend this approach to be used in other country or areas
for monitoring this transboundary particle pollution.
Subjects
Sand storm
Microscopy
Particle
PM10
Taiwan
Publisher
臺北市：國立臺灣大學植物病理與微生物學系暨研究所
Type
other
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