國立臺灣大學植物病理與微生物學系暨研究所孫岩章2006-07-262018-06-292006-07-262018-06-292004http://ntur.lib.ntu.edu.tw//handle/246246/17696At 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.application/pdf59362 bytesapplication/pdfzh-TW國立臺灣大學植物病理與微生物學系暨研究所Sand stormMicroscopyParticlePM10Taiwanotherhttp://ntur.lib.ntu.edu.tw/bitstream/246246/17696/1/922313B002115.pdf