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우리나라 겨울철 기온과 북반구 대기 순환과의 상관성 분석
임소민(So-Min Lim),예상욱(Sang-Wook Yeh),김공래(Gong-Rae Kim) 한국기상학회 2012 대기 Vol.22 No.2
This study investigates the relationship between the Korean temperature and the atmospheric circulation such as Arctic Oscillation, Siberian High and Aleutian Low during the winter (December-January) for the period of 1970-2011. It is found that all indices to represent aforementioned circulations are significantly correlated with Korean winter temperature for the period of 1970 - 2011. There are marked contrasts in such relationship, however, before and after the mid-1980s when a significant regime shift of Korean winter temperature occurred. While Korean winter temperature has a close relationship with Arctic Oscillation after the mid-1980s, its relationship with Siberian High and Aleutian Low is weakened. The composite analysis between a positive and negative phase of Arctic Oscillation before and after the mid-1980s is conducted to examine a recent strengthening of Arctic Oscillation-Korean winter temperature relationship. It is found that the structural changes of low-level wind and the geopotential height at 500 hPa between the two phases of Arctic Oscillation are more effective to influence Korean winter temperature after the mid-1980s. This may induce a close relationship between the Korean winter temperature variability and Arctic Oscillation after the mid-1980s compared to before the mid-1980s.
GloSea5의 과거기후 모의자료에서 나타난 El Niño와 관련된 동아시아 강수 및 기온 예측성능
임소민(So-Min Lim),현유경(Yu-Kyung Hyun),강현석(Hyun-Suk Kang),예상욱(Sang-Wook Yeh) 한국기상학회 2018 대기 Vol.28 No.1
In this study, we investigate the performance of Global Seasonal Forecasting System version 5 (GloSea5) in Korea Meteorological Administration on the relationship between El Niño and East Asian climate for the period of 1991~2010. It is found that the GloSea5 has a great prediction skill of El Niño whose anomaly correlation coefficients of Niño indices are over 0.96 during winter. The eastern Pacific (EP) El Niño and the central Pacific (CP) El Niño are considered and we analyze for EP El Niño, which is well simulated in GloSea5. The analysis period is divided into the developing phase of El Niño summer (JJA(0)), mature phase of El Niño winter (D(0)JF(1)), and decaying phase of El Niño summer (JJA(1)). The GloSea5 simulates the relationship between precipitation and temperature in East Asia and the prediction skill for the East Asian precipitation and temperature varies depending on the El Niño phase. While the precipitation and temperature are simulated well over the equatorial western Pacific region, there are biases in mid-latitude region during the JJA(0) and JJA(1). Because the low level pressure, wind, and vertical stream function are simulated weakly toward mid-latitude region, though they are similar with observation in low-latitude region. During the D(0)JF(1), the precipitation and temperature patterns analogize with observation in most regions, but there is temperature bias in inland over East Asia. The reason is that the GloSea5 poorly predicts the weakening of Siberian high, even though the shift of Aleutian low is predicted. Overall, the predictability of precipitation and temperature related to El Niño in the GloSea5 is considered to be better in D(0)JF(1) than JJA(0) and JJA(1) and better in ocean than in inland region.
이민석,정윤호,임소민,허재우,김종열,Lee, Min-Seok,Jeong, Yun-Ho,Lim, So-Min,Heo, Jae-Woo,Kim, Jong-Ryeol 한국융합신호처리학회 2020 융합신호처리학회 논문지 (JISPS) Vol.21 No.4
친환경적이고 에너지 절약적인 난방 방법으로 히트펌프에 대한 관심이 높아지고 있다. 특히, 저온 지역에서 난방이 가능한 히트펌프를 개발하기 위해 실외기 표면에 서리가 발생하지 않도록 하는 연구가 많아지고 있다. 즉, 온도가 낮은 지역에서 히트펌프를 통해 난방을 할 경우 실외기 표면에 서리층이 형성되어 전열성능을 떨어뜨려 난방능력을 감소시키는 것이 일반적이다. 따라서 본 연구에서는 히트펌프의 실외기에 유입되는 습공기의 수증기를 흡착식 제습시스템을 부착하여 제거하고자 한다. 본 연구를 통해 저온지역에서 가장 효과적인 제습방법을 제시할 수 있을 것으로 판단된다. 그리고 히트펌프의 실외기 전면에 흡착식 제습시스템을 부착하여 에너지 효율이 높은 히트펌프를 개발할 수 있을 것으로 사료된다. Interest in heat pumps is increasing as an eco-friendly and energy-saving heating method. In particular, in order to develop a heat pump capable of heating in a low-temperature area, research to prevent frost on the surface of the outdoor unit is increasing. In other words, when heating through a heat pump in a low-temperature area, a frost layer is formed on the surface of the outdoor unit, which lowers the heat transfer performance, thereby reducing the heating capacity. Therefore, in this study, an adsorption-type dehumidification system is attached to remove the moisture vapor of the air into the outdoor unit of the heat pump. It is believed that this study can suggest the most effective dehumidification method in low temperature regions. In addition, it is expected that a heat pump with high energy efficiency can be developed by attaching an adsorption dehumidifying system to the front of the outdoor unit of the heat pump.