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Snowstorm over the Southwestern Coast of the Korean Peninsula Associated with the Development of Mesocyclone over the Yellow Sea

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Advances in Atmospheric Sciences 2008年第5期25卷 765-777页

作者： Ki-Young HEO kyung-ja ha Division of Earth Environmental System College of Natural Sciences Pusan National University Korea

This study investigates the characteristics of a heavy snowfall event over the southwestern part of the Korean Peninsula on 4 December 2005. The snowstorm was a type of mesoscale maritime cyclone which resulted from barotropic instability, and diabatic heating from the warm ocean in continental polar air masses. Based on surface observations, radiosonde soundings, MTSAT-1R satellite data and the 10-km grid RDAPS （Regional Assimilation and Prediction System based on the PSU/NCAR MM5） data, the evolution of the mesocyclone is explained by the following dynamics; （1） In the initial stage, the primary role in the cyclogenesis process of the mesocyclone is a barotropic instability in the horizontal shear zone. （2） In the developing stage, the mesocyclone moves and deepens into a baroclinic zone corresponding to the surface heating and moistening. （3） In the mature stage, it is found that the mesocyclone is intensified by the destabilization caused by enhanced low-level heating and condensation, the moisture flux convergence, and the interaction between upper and lower-level potential vorticity anomalies. We suggest that a checklist with stepwise indicators responsible for development be prepared for the forecasting of heavy snowfall over the southwestern part of the Korean Peninsula.

关键词： heavy snowfall mesocyclone baroclinic instability barotropic instability stepwise roles potential vorticity anomalies

Implementation of Turbulent Mixing over a Stratocumulus-Topped Boundary Layer and Its Impact in a GCM

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Advances in Atmospheric Sciences 2009年第5期26卷 995-1004页

作者： Sun-Hee SHIN kyung-ja ha Division of Earth Environmental System Pusan National University

The effect of a vertical diffusion scheme over a stratocumulus topped boundary layer （STBL） was investigated using the YONU AGCM （Yonsei University Atmospheric General Circulation Model）. To consider the impact of clouds on the turbulence production, the turbulence mixing term, driven by radiative cooling at the cloud top, is implemented as an extended non-local diffusion scheme. In the model with this new scheme, the STBL parameterization significantly influences the lower atmosphere over the tropical and subtropical regions. Consideration of the turbulent mixing within the cloud layer leads to continuous stratocumulus formation. The cloud-top radiative cooling tends to favor more rapid entrainment and produces top-down turbulent mixing. This cooling develops a mixed layer without initiation of deep convection by surface fluxes. Variations in thermodynamical and dynamical features are produced by planetary boundary layer （PBL） cloud development. The simulated stratocumulus induces more mixing of heat and moisture due to the cloud forcing. Over STBL regions, the lower boundary layer becomes warmer and drier. It also weakens vertical motion and zonal trade winds in the eastern Pacific, which indicates that stratocumulus cloud cover plays a role in weakening the Walker circulation; that is, cloud cover damps the tropical circulation.

关键词： stratocumulus topped boundary layer non-local diffusion scheme tropical circulation general circulation model

Decadal Changes in Climatological Intraseasonal Fluctuation of Subseasonal Evolution of Summer Precipitation over the Korean Peninsula in the mid-1990s

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Advances in Atmospheric Sciences 2011年第3期28卷 591-600页

作者： WonMoo KIM Jong-Ghap JHUN kyung-ja ha Masahide KIMOTO School of Earth and Environmental Sciences/Research Institute of Oceanography Seoul National University151-742Korea Divison of Earth Environmental System Pusan National University609-735Korea Atmosphere and Ocean Research Institute University of Tokyo277-8564Japan

Decadal changes in the subseasonal evolution and the phase-locked climatological intraseasonal fluctuation of summertime rainfall over the Korean Peninsula before and after the mid-1990s are *** activity and the migration speed of the monsoon rain band over the East Asian region are altered in the recent decade,resulting in the drier conditions in late spring and the earlier onset of *** early August when a climatological monsoon break was clear in the earlier decade,the precipitation has increased dramatically with a meridional *** response to the enhanced convection over the South China Sea and southeastern China provides a favorable condition for more precipitation in early August through the changes in moisture transport and tropical cyclone passage.

关键词： decadal change intraseasonal fluctuation East Asian summer monsoon

Two Types of Diurnal Variations in Heavy Rainfall during July over Korea

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Advances in Atmospheric Sciences 2021年第12期38卷 2201-2211页

作者： Chang-Kyun PARK Minhee ChaNG Chang-Hoi HO kyung-ja ha Jinwon KIM Byung-Ju SOHN School of Earth and Environmental Sciences Seoul National UniversitySeoul 08826Korea School of Earth and Environmental Systems Pusan National UniversityBusan 46241Korea Center for Climate Physics Institute for Basic ScienceBusan 46241Korea National Institute of Meteorological Sciences Korean Meteorological AdministrationJeju 63568Korea

This study examined the characteristics of the diurnal variations of heavy rainfall(≥110 mm in 12 hours)in Korea and the related atmospheric circulation for July from 1980−*** the analysis period,two dominant pattens of diurnal variation of the heavy rainfall emerged:all-day heavy rainfall(AD)and morning only heavy rainfall(MO)*** the AD-type,the heavy rainfall is caused by abundant moisture content in conjunction with active convection in the morning(0000−1200,LST;LST=UTC+9)and the afternoon hours(1200−2400 LST).These systems are related to the enhanced moisture inflow and upward motion induced by the strengthening of the western North Pacific subtropical high and upper-tropospheric *** the MO-type,heavy rainfall occurs mostly in the morning hours;the associated atmospheric patterns are similar to the *** find that the atmospheric pattern related to severe heavy rainfalls in 2020 corresponds to a typical AD-type and resembles the 1991 heavy-rainfall system in its overall synoptic/mesoscale *** present results imply that extremely heavy rainfall episodes in Korea during the 2020 summer may occur again in the future associated with the recurring atmospheric phenomenon related to the heavy rainfall.

关键词： heavy rainfall diurnal cycle of rainfall 2020 summer summer rainy season Korea

Preface to the Special Issue:Climate Change and Variability of Tropical Cyclone Activity

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Advances in Atmospheric Sciences 2022年第2期39卷 203-204页

作者： Liguang WU Bin WANG Johnny CLChaN kyung-ja ha Il-Ju MOON Jun MATSUMOTO Zhemin TAN Ke FAN Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China International Pacific Research Center School of Ocean and Earth Science and TechnologyUniversity of HawaiiHonoluluHI 96822USA School of Energy and Environment City University of Hong KongHong KongChina Research Center for Climate Sciences Pusan National UniversityBusan 46241South Korea Typhoon Research Center Jeju National UniversityJeju 63243South Korea Research Center for Climatology Department of GeographyTokyo Metropolitan UniversityTokyo 192-0392Japan School of Atmospheric Sciences Nanjing UniversityNanjing 210023China School of Atmospheric Sciences Sun Yat-Sen UniversityZhuhai 519082China

Tropical cyclones(TCs) are one of the most destructive natural phenomena on Earth in terms of human-life and economic losses. It is currently a matter of prodigious public and scientific interest how TC activity has changed and will change in a warming climate. This special issue focuses on a challenging subject raised in the Intergovernmental Panel on Climate Change(IPCC) report and numerous research papers.

关键词： warming Earth raised

Interdecadal shift in the relationship between the East Asian summer monsoon and the tropical Indian Ocean

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Interdecadal shift in the relationship between the East Asia...

Vertical plane depth-resolved surface potential and carrier separation characteristics in flexible CZTSSe solar cells with over 12% efficiency

“2010年北京气象学会中青年优秀论文评选”学术研讨会

作者： kyung-ja ha Division of Earth Environmental System Pusan National UniversityBusan 609-735Korea

In this work,the authors investigate changes in the interannual relationship between the East Asian summer monsoon(EASM) and the tropical Indian Ocean(IO) in the late *** contrasting the correlations of the EASM index(EASMI) with the summer IO sea surface temperature anomaly(SSTA) between 1953-1975 and 1978-2000,a pronounced different correlation pattern is found in the tropical *** SSTA pattern similar to the positive Indian Ocean Dipole(IOD) shows a strongly positive correlation with the EASMI in *** in 1978-2000,significant negative correlation appears in the northern IO and the IOD-like correlation pattern *** is indicated that the summer strong IOD events in 1953-1975 can cause a weaker-than-normal western North Pacific(WNP) subtropical high,which tends to favor a strong *** 1978-2000, the connection between the summer IOD and the WNP circulation is disrupted by the climate ***,the northern IO shows a close connection with the WNP circulation in *** warming over the northern IO is associated with the significant enhanced 500 hPa geopotential height and an anomalous anticyclone over the *** change in the IO-EASM relationship is attributed to the interdecadal change of the background state of the ocean-atmosphere system and the interaction between the ENSO and *** recent decades,the tropical IO and tropical Pacific have a warmer mean SST,which has likely strengthened(weakened) the influence of the northern IO (IOD) on the *** addition,due to the increase in the ENSO variability along with the higher mean equatorial eastern Pacific SST in 1978-2000,the influence of ENSO on the East Asian summer circulation experiences a significant strengthening after the late *** the warming over the northern IO is associated with the significant warming in the equatorial eastern Pacific,the strengthened ENSO-EASM relationship has likely also contributed to the strengthened relationship between the northern I

关键词： East Asian summer monsoon Indian Ocean Interdecadal shift ENSO

来源： cnki会议评论

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Carbon Energy 2024年第3期6卷 36-52页

作者： Dae-Ho Son ha kyung Park Dae-Hwan Kim Jin-Kyu Kang Shi-Joon Sung Dae-Kue Hwang jaebaek Lee Dong-Hwan Jeon Yunae Cho William Jo Taeseon Lee JunHo Kim Sang-Hoon Nam Kee-Jeong Yang Division of Energy Technology DGISTDaeguRepublic of Korea Research Center for Thin Film Solar Cells DGISTDaeguRepublic of Korea Department of Physics Ewha Womans UniversitySeoulRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusettsUSA

Cu2ZnSn(S,Se)4(CZTSSe)solar cells have resource distribution and economic *** main cause of their low efficiency is carrier loss resulting from recombination of photo-generated electron and *** overcome this,it is important to understand their electron-hole behavior *** determine the carrier separation characteristics,we measured the surface potential and the local current in terms of the absorber *** elemental variation in the intragrains(IGs)and at the grain boundaries(GBs)caused a band edge shift and bandgap(Eg)*** the absorber surface and subsurface,an upward Ec and Ev band bending structure was observed at the GBs,and the carrier separation was *** the absorber center,both upward Ec and Ev and downward Ec-upward Ev band bending structures were observed at the GBs,and the carrier separation was *** improve the carrier separation and suppress carrier recombination,an upward Ec and Ev band bending structure at the GBs is desirable.

关键词： carrier separation CZTSSe flexible solar cell local current surface potential

Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： Jong-Woon ha Seung Hun Eom Bo kyung Cha Seyeong Song Hyeong Ju Eun Jong H.Kim Jong Mok Park BongSoo Kim Byoungwook Park Seo-Jin Ko Sung Cheol Yoon Changjin Lee In Hwan Jung Do-Hoon Hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

汉语非流畅性失语症患者特指疑问句句法障碍特征

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听力学及言语疾病杂志 2024年

作者：康晓茜张宗云郎晓赵纹笙 Kim ha kyung 王勇丽黄昭鸣华东师范大学教育学部康复科学系山东省耳鼻喉医院

目的研究汉语非流畅性失语症患者特指疑问句理解与表达的句法障碍特征。方法以句-图匹配、诱导-复述的形式对25例汉语非流畅性失语症患者和25例正常人进行理解和表达能力测试,比较两组结果差异,分析句式、提问对象和疑问词相关句法障... 详细信息

目的研究汉语非流畅性失语症患者特指疑问句理解与表达的句法障碍特征。方法以句-图匹配、诱导-复述的形式对25例汉语非流畅性失语症患者和25例正常人进行理解和表达能力测试,比较两组结果差异,分析句式、提问对象和疑问词相关句法障碍特点。结果非流畅性失语症患者特指疑问句理解和表达能力均受损,各种类型特指疑问句的正确率均显著低于对照组(P主语伪分裂疑问句和被动疑问句;各种类型的特指疑问句产出正确率均低于对照组,“谁”主动疑问句、“什么”宾语主动疑问句的正确率无显著性差异(P>0.05),其他类型均存在显著性差异(P伪分裂疑问句和被动疑问句。结论汉语非流畅性失语症患者特指疑问句理解和表达受损模式基本相似。句法结构方面主要影响因素包括提问对象(主宾)和句式类型,有wh-成分移位、非规范顺序的句子障碍更明显。

关键词：非流畅性失语症特指疑问句理解表达句法