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
Date Issued
2003
Date
2003
Author(s)
DOI
912313B002356
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. 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.
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. 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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