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우리나라 공간적 범위를 고려한 통합 극한기후지수의 적용 연구 - 지상 관측지점 연단위 자료 이용 -
문자연,최영은,김유진 건국대학교 기후연구소 2020 기후연구 Vol.15 No.1
An application of an integrated climate extreme index (CEI) is presented, that quantifies observed climate change of South Korea by various five indicators. Based on an annual basis surface observation station data, climate extreme indicators that measure the fraction of the stations in South Korea are analyzed. Results for the annual CEI indicate that the area experiencing much above-normal maximum and minimum temperatures in recent years has been increased. The extremes in much greater-than-normal number of days with or without precipitation has a large interannual variability similar with much above and below normal standardized precipitation index. Results from above-normal proportion of heavy daily precipitation show a more pronounced increasing feature from 1990’s to the early 2010’s. Five indicators in CEI had distinct contrasting features which indicates that CEI can be a useful tool in providing the information on the percentage of the climate in South Korea that experienced various kinds of extreme conditions during any given year or period.
문자연,김기영 건국대학교 기후연구소 2021 기후연구 Vol.16 No.2
The present study aims to analyze climate change and trend of extreme temperature events occurred over the Republic of Korea. The observation data used are daily average, maximum, and minimum temperature from 6 weather stations for the period of 1912-2020. Seven extreme indices regarding frequency and extreme value of temperature are calculated in seasonal and annual time range. In addition, hot extremes and their changes by four physical terms that include information on the annual mean temperature, the amplitude of the annual cycle, the diurnal temperature range and the local temperature anomaly on the day of the extreme are analyzed. The climatology for the analysis is updated to the new normal year of 1991-2020. Consistent with the previous findings, statistically significant change was detected in the indices of annual lowest daily minimum temperature, annual extreme temperature range, frequency of daily minimum temperature below -12℃ and 10%ile(TN10p) during winter. Due to the gradual decrease of the occurrence days regarding the extreme minimum temperature during winter, the frequency calculated by the relative threshold in extreme high temperature during summer prevail since 1990s. Indices related with extreme high temperature had larger low-frequency variability than significant climate change during the analysis period. However, the assessment of hot extremes according to the terms describing mean, variability and tails during the new normal year of 1991-2020, significant increasing trend was detected not only in the annual mean and the amplitude of the seasonal cycle, but also in the daily hot extreme anomaly.
문자연,권영아,최영은,박인홍 건국대학교 기후연구소 2014 기후연구 Vol.9 No.4
In this study, we analyzed the characteristics of summer rainfall over South Korea during recentfive(2009-2013) years using observation data. There was a significant contrast in interannual variabilitybetween July and August rainfall since 1998. Large increase of rainfall in July (2009 and 2011) and August(2010 and 2012) were found to be consistent over all 60 stations in South Korea. Enhanced precipitationover western tropical Pacific and anticyclonic anomaly to the east of Korean peninsula were the commonfeatures when there was rainfall increase both in July and August. Intraseasonal summer rainfall overSouth Korea evolves in time lag with intraseasonal Indian and Western North Pacific monsoon indices. The meridional tripole structure of intraseasonal convection from the Western North Pacific to EastAsia and the baroclinic structure of intraseasonal circulation anomalies centered over Korean peninsulaprovided a favorable condition for the extreme rainfall(90 percentile) events to occur.
종관 및 대규모 순환과 관련된 우리나라 여름철 극한강수 특성 연구
문자연,최영은,김유진,김민기 건국대학교 기후연구소 2015 기후연구 Vol.10 No.4
In this study, we analyzed the characteristics of summer extreme rainfall over South Korea and their relationships with the synoptic and large-scale circulation anomalies during 1979-2014. Heavy rainfall (R90p) is related with the strong convection surrounded by dry zone over Korean peninsula and the moist air delivered from the convection area over Bay of Bengal-South China Sea-Philippine Sea. The upper-level anticyclonic flow with the low-level dipole of anticyclonic circulation in the Southeast and cyclonic circulation to the northwest of Korean peninsula are the main characteristics when the extreme rainfall occurs. The barotropic Rossby wave developed over the Korean peninsula transfers its energy farther downstream to the western coast of North America. It is also found that the dominant lowfrequency oscillation over the tropics (intraseasonal oscillation) play an important background role for the enhancement of extreme rainfall over South Korea.