• 한국환경과학회지
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• 제10권2호
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• pp.129-133
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• 2001

The purpose of this study is to examine the property of climatological environment using the daily mean meteorological data measured at the serveral meteorological observatory for 30years(1961~1990). It was found that the distribution of discomfort index tended to mainly depend on the geographical situation in the same season. Major portions of Korea were subjected to continental except for some seaside districts. The discomfort index have a large(small) value in summer(winter) season. And there is a short interval(1 or 2 months) between summer and winter season in Korea.

• 한국환경과학회지
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• 제25권6호
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• pp.897-904
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• 2016

We investigated the local climatological characteristics of the mountain adjacent the Dongyeong herb garden in Chilgok. We established one set of automatic weather system (AWS) on a hill where development of herb garden is in progress. The observations were continued for 2 years(2013. 07-2015.06). In this study, we analyzed the observed data comparing the data of Gumi meteorological observatory (GMO). The results showed that the air temperature(relative humidity) of Dongyeong herb garden were lower(higher) than those of GMO. Especially the differences are more during warm climate season. It means that the gaps of thermal environment between two points are mainly caused by the evaporation effects of forest. In addition, we analyzed the warmth indices(warmth index and coldness index) with the observed air temperature. The warmth and coldness indices indicate about 107 and -12, respectively. The values correspond to warm temperature climate.

• 한국환경과학회지
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• 제32권5호
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• pp.365-374
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• 2023

Eight years (2014-2021) of climate data were collected from an automatic weather observation system installed at the foot of Mt. Geumo in Chilgok, Gyeongbuk. Using these data, we investigated local bio-climatological indices (warmth index, WI; coldness index, CI; and effective accumulated temperature, EAT) of the mountain region adjacent to the Keimyung Dongyeong forest. The study area's WI and CI were 109.3℃ and -11.3℃ per month, respectively, averaged across 8 years. These values are indicative of an evergreen broad-leaved forest in the warm temperate climate zone, suitable for cultivating sweet persimmons and figs. Additionally, EAT in Dongyeong was 2,113.7℃, averaged across 8 years, suitable for growing crops such as corn, soybean, and potato.

• 한국환경과학회지
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• 제21권2호
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• pp.125-133
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• 2012

Climatological trend for the period of 1970 to 2009 in sea water temperature around the Antarctic Peninsular waters in the Southern Ocean was investigated. During the period from 1970 to 2009, sea water temperature in the top 500 m water column except 100 m increased at a rate of $0.003-0.011^{\circ}C{\cdot}yr^{-1}$, but at 100 m it decreased at a rate of $-0.003^{\circ}C{\cdot}yr^{-1}$. Although long-term trend is generally warming, there were several periods of sharp changes between 1970 and 2009. Annual mean sea water temperature between surface and 500 m except 100 m decreased from the early of 1970s to the end of 1980s, and then it increased to the end of 2000s. In the entire water column between the surface and 500 m, sea water temperature closely correlated with the El Nino events expressed as the Southern Oscillation Index(SOI), and SOI and sea water temperature have a dominant period of about 3-5 years and decade.

• 한국수자원학회논문집
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• 제38권2호
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• pp.111-119
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• 2005

이 연구에서는 49년간 (1954-2002년) 한반도 기상 관측소 자료로부터 한강과 낙동강 유역의 유역평균 월강수량 시계열의 변동에 대한 기후특성을 분석하였다. 비록 두 유역의 연강수량의 크기는 차이가 있으나 월별 변동 특성은 매우 유사하였다. 특히 4월 유역평균 강수량은 감소 경향이 뚜렷하였고, 8월 유역평균 강수량은 증가 경향이 매우 뚜렷하였다. 또한 1970년 중반에 유역평균 월강수량의 변동에 변화가 나타났다. NINO3 지수와 한강과 낙동강 유역평균 월강수량 편차와의 동시상관분석으로부터 유역평균 9월 강수량은 NINO3 지수와 지속적인 음의 상관을 보였고, 11월 유역평균 강수량과는 양의 상관이 크게 나타났다.

• 한국수자원학회논문집
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• 제46권6호
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• pp.613-627
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• 2013

본 연구에서는 지속기간별(1-, 3-, 6-, 12-, 24개월)로 가장 가뭄이 심한 해의 5월 건조현상을 지역별로 분석하기 위해 1973년부터 2006년까지 우리나라 53개 기후관측지점에서 관측된 월별 기후자료를 이용하여 FAO Penman-Monteith 기준잠재증발산량(RET)을 산정하였다. 그리고 강수량(P)에 대한 RET의 비(P/RET)를 이용하여 건조지수(aridity index)와 P/RET의 변동지수(variation index, VI)를 산정하고, 표준강수지수(standard precipitation index, SPI)와 비교하였다. 우리나라 지역별 건조현상을 파악하기 위해 53개 기후관측지점을 20개 연구지역으로 구분하여 분석하였다. 또한 지역별 건조지수의 추세분석을 위해 Mann-Kendall 추세분석, Spearman rank test 그리고 Sen's slope을 적용하였다. 분석 결과에 의하면 각 지속기간별로 P/RET의 변동지수(VI)와 표준강수지수사이에 양호한 상관관계를 보였다. 또한 우리나라 전역에 걸쳐서 지속기간이 단기화 될수록 5월 기후가 더욱 건조한 것으로 나타났다. 3개월이나 6개월 지속기간의 경우 대부분 지역에서 유의하거나 혹은 유의하지 않은 수준에서 건조지수의 감소추세를 보였다. 반면에 12개월 및 24개월 지속기간의 경우 유의한 건조지수의 감소추세를 보이는 지역은 없는 것으로 나타났다.

• 한국지구과학회지
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• 제30권6호
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• pp.734-743
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• 2009

본 연구는 부산지역의 먼지 농도와 황사발원지의 기후학적 요소를 주기분석 함으로써 부산지역의 먼지농도 주기에 영향을 주는 기후학적 조건, 특히 황사 발생과의 관련성에 대하여 고찰하였다. 부산지역에서 관측된 먼지 농도 시계열 자료를 이용한 단일스펙트럼분석을 수행한 결과 배출량이나 강수 효과 등에 의해 나타난 일반적인 주기(1년, 7일) 이외에, 상대적으로 3-4년 주기가 우세하게 나타났으며, 먼지 농도와 부산지역의 기상자료 및 황사발원지에서의 풍속과의 교차스펙트럼 분석을 통한 주기 분석을 수행해 본 결과, 3-4년 주기일 때 먼지농도와 풍속, 기압은 양의 상관관계, 기온, 상대습도와는 각각 음의 상관관계가 나타났다. 이는 황사 발생 조건과 잘 부합되는 것으로 나타나, 3-4년의 먼지 농도 주기는 황사의 장거리 수송과 관련이 있는 것으로 판단된다. 또한 황사 발생은 발원지의 지표 상태에 따라 발생빈도가 달라지므로, 여러 기후학적 요소들 중 황사발원지에서의 강수량과의 주기 분석을 수행해 본 결과, 발원지에서의 강수량 그 자체보다는 발원지에서의 가뭄지수(EDI)의 시계열이 우리나라 먼지 농도의 3-4년 주기와 더 연관이 있는 것으로 나타났고 이는 기후학적으로 황사 발원지에서의 지표건조 특성의 변동성과 연관이 있는 것으로 나타났다.

• 응용통계연구
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• 제25권6호
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• pp.977-985
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• 2012

Data quality and climate forecasting performance deteriorates because of long climate data contaminated by non-climatic factors such as the station relocation or new instrument replacement. For a trusted climate forecast, it is necessary to implement data quality control and test inhomogeneous data. Before the inhomogeneity test, a reference series was created by $d$ index to measure the temperature series relationship between the candidate and surrounding stations. In this study, a inhomogeneity test to each season and climatological station was performed on the daily mean temperatures, daily minimum temperatures and daily maximum temperatures. After comparing two inhomogeneity tests, the traditional and the adjusted SNHT method, we found the adjusted SNHT method was slightly superior to the traditional one.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.1166-1171
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• 2006

Drought is defined by differently for the several scientific and technical fields such as hydrological drought, agricultural drought, meteorological drought, climatological drought, atmospheric drought. A lot of drought indices have been developed to quantify drought severity levels. However these drought indices might be expressed differently as the drought conditions for specific period because the drought severity level is using different types of data on each condition. It is necessary for development of quantative drought representation methods by drought index application. In this research, the reaction to the historical droughts is analyzed after estimation of PDSI, SPI and MSWSI(Modified Surface Water Supply Index) in south korean territory. Lastly the drought representation methods were examiner combining the drought indices by drought indices. The arithmetic mean drought indices that include PDSI, SPI, in yearly basis from 1971 to 2001 and MSWSI in yearly basis from 1974 to 2001 were estimated through the whole nation. The applicability of drought indices are examined based on the observed drought data for national and regional droughts. The result shows that PDSI, SPI(3), SPI(6), and MSWSI have proven to be sensitive enough to the historical drought. The correlation analysis of each drought index was conducted whether they could show the long and short term drought equally. The analysis of how appropriately represent for the historical drought was used for determining for the combined drought index. Consequently, PDSI, SPI(3), SPI(6), and MSWSI have been appeared as suitable indices for the development of quantitative drought representation methods. For the decision of weight on combining PDSI, SPI(3), SPI(6), and MSWSI, drought map was made for eighteen alternative to decide weight. The results showed that PDSI(20%), SPI(3)(60%), SPI(6)(10%), and MSWSI(10%) have been the most well matched weights. Using selected weights of each drought indices and by reconstructing the national mean drought severity on yearly basis, the fact that the year of historical drought is in accordance with the verified one for drought representation. In short, the acquired technique using combined drought index can be used for useful and believable quantitative method of drought analysis.

• The Korean Journal of Ecology
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• 제1권1호
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• pp.17-23
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• 1977

Flowering dates of 389 plant species in the Hongneung Arboretum, Seoul, had been recorded from 1968 through 1975. The thermal analysis on the air temperature as the key factor determining the first flowering date, with climatological data obtained in the Arboretum, were undertaken by Nuttonson's Index (1948) and Lindsey & Newman's Index (1956). The results and conclusion in this study are as follow; Peak in the bell shape distribution curve of the species and first flowering dates, largely, was early May. Flower spans of most species were 10 to 20 days, neverthless, some species flower only a few days while others may stay flowering a hundred days even more. Increase-curves of summation temperature from early spring through late-summer showed almost the same mode in both Nuttonson;s Index (Tn) and Lindsey & Newman's Index (T1). These Indices manifested the exponential curve, increasing slowly at the beginning of spring chiefly but rapidly from the middle part of April. The equation of the linear relationahip between Tn and Tl as far as in thisstudy is as follow. Tl=230Tn It appears that the distribution of summation temperature, below Tn=400°C·day, affects the first flowering, even though it could be modified somehow by the distribution of precipitation, day length and others. Nuttonson's Index (Tn.f) and Lindsey & Newman's Index (Tl.f) upon the thermal amount first flowering dates have been respectively simulated as follow. Tn.f=θa + C Tl.f=230θa + 230C where θ is air temperature 10°C, a and C are a constant.