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전종갑,예상욱,권민호,정용승 한국교원대학교 환경과학연구소 2001 환경연구논문집 Vol.- No.6
Yellow-sand phenomena which observed in the springtime in South Korea for the period of 1967-1996 have been investigated. The result shows that the average number of yellow-sand days and events per spring is 8.4 and 3.4, respectively, and the average duration of yellow-sand phenomena is 18.5 hours. Also, yellow-sand data at ten big cities are statistically analyzed in terms of frequency and duration according to the source region of yellow sands far the period of 1980~1994. Yellow sands observed in South Korea originated from the Takla-Makan Desert, the Gobi Desert and/or the Loess Plateau. The mean number of yellow-sand days in the springtime in those origins is 52.5, 29.1, and 7.5, respectively. In the Gobi Desert and the Loess Plateau yellow sands occurred most frequently in April. The cases of long-lasting yellow sands are analyzed in terms of the background synoptic patterns. The case of yellow sands reaching to the Korean Peninsula is compared with the case of these not reaching, by classifying the flow patterns in the upper layer using a Kirchhofer method. The results show that the important factors of the circulation influencing on the yellow-sand transport to the Korean Peninsula are the location of trough on the 500 hPa or the 700 hPa level and the flow direction on the 850 hPa level.