KLAPS를 활용한 겨울철 한반도 중서부지방의 강수유형판별 연구

Abstract

Distinguishing rain from snow in a weather forecast is very important for quantitative forecasting about the amount of precipitation. However, it is not easy to discriminate the demarcation, and it can result in incorrect weather information. Based on this view, I want to study the synoptic condition of the atmosphere by analyzing precipitation patterns starting from Feb. 4th, 2010 to Feb 12th, 2010, using surface distribution charts, AWS(Automatic Weather System) accumulated rainfall data, synoptic maps, MTSAT satellite images, as well as and radar images, and to propose an alternative standard for forecasting rain and snow by using KLAPS(Korea Local Analysis and Prediction System). KLAPS is a system which rapidly analyzes substantial amounts of observation data produced by various observation equipment within a limited time for weather forecasters to understand atmospheric conditions synthetically. It is producing analysis data with high-resolution by comprehensively processing and analyzing all the observation data available in Korea. Thus, I performed analysis with it by producing an output from north and south vertical section of 1,000-700hPa thickness · surface temperature, sounding, equivalent potential temperature · temperature · wind with Seoul(37.6N, 127.0E) as the center. As a result, I found out that the wintertime precipitation in Korean Peninsula was as follows. As the cold and dry Siberian high extends it power, a southwest air current is formed while a trough of pressure is passing over the Korean Peninsula. Precipitation was high when a trough of pressure develops as the cold upper air current moves south, and the northeast air current is strengthened. We need to analyze both thickness and temperature since they are closely related. Thickness lines tended to move south as the temperature dropped, and the freezing level recorded low when the precipitation form turned out to be snow. When it comes to the equivalent potential temperature, we could see instability being intensified due to the growing convection current when there was a big equivalent potential temperature difference between the upper and the lower layers. Therefore, I can see there are many differences in wintertime precipitation regarding its scale, shape, and size. They are not only determined by the changes of the temperature in that location, but the distribution of precipitation particles can be differentiated due to the altitude where the crystals created and vertical wind shear. I want to increase the accurate weather forecast possibility of precipitation form, which hasn't been precise so far, and to contribute to reducing the damage resulting in meteorological disaster by providing weather forecast guidance through a quantification of precedence elements rather than a generalization of analyzed materials in this research. To do that, we need to expand material analysis, diversify the elements of analyzation, and accumulate data interpretation abilities.