Kyoung Nam Jo
Kangwon National University
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Featured researches published by Kyoung Nam Jo.
Nature | 2014
Kyoung Nam Jo; Kyung Sik Woo; Sangheon Yi; Dong Yoon Yang; Hyoun Soo Lim; Yongjin Wang; Hai Cheng; R. Lawrence Edwards
An interhemispheric hydrologic seesaw—in which latitudinal migrations of the Intertropical Convergence Zone (ITCZ) produce simultaneous wetting (increased precipitation) in one hemisphere and drying in the other—has been discovered in some tropical and subtropical regions. For instance, Chinese and Brazilian subtropical speleothem (cave formations such as stalactites and stalagmites) records show opposite trends in time series of oxygen isotopes (a proxy for precipitation variability) at millennial to orbital timescales, suggesting that hydrologic cycles were antiphased in the northerly versus southerly subtropics. This tropical to subtropical hydrologic phenomenon is likely to be an initial and important climatic response to orbital forcing. The impacts of such an interhemispheric hydrologic seesaw on higher-latitude regions and the global climate system, however, are unknown. Here we show that the antiphasing seen in the tropical records is also present in both hemispheres of the mid-latitude western Pacific Ocean. Our results are based on a new 550,000-year record of the growth frequency of speleothems from the Korean peninsula, which we compare to Southern Hemisphere equivalents. The Korean data are discontinuous and derived from 24 separate speleothems, but still allow the identification of periods of peak speleothem growth and, thus, precipitation. The clear hemispheric antiphasing indicates that the sphere of influence of the interhemispheric hydrologic seesaw over the past 550,000 years extended at least to the mid-latitudes, such as northeast Asia, and that orbital-timescale ITCZ shifts can have serious effects on temperate climate systems. Furthermore, our result implies that insolation-driven ITCZ dynamics may provoke water vapour and vegetation feedbacks in northern mid-latitude regions and could have regulated global climate conditions throughout the late Quaternary ice age cycles.
Scientific Reports | 2017
Kyoung Nam Jo; Sangheon Yi; Jin Yong Lee; Kyung Sik Woo; Hai Cheng; Lawrence R. Edwards
The Holocene variability in the East Asian summer monsoon (EASM) based on speleothem δ18O records has inconsistencies in timing, duration, and expression of millennial-scale events among nearby regions, and even within the same cave. Here, we present another stalagmite δ18O record with multi-decadal time resolution from the temperate Korean Peninsula (KP) for the last 5500 years in order to compare with Holocene millennial-scale EASM events from Southeast Asia. Based on our new stalagmite δ18O record, millennial-scale events since the mid-Holocene were successfully identified in the KP, representing a noticeable cyclic pattern with a periodicity of around 1000 years. We propose that the Holocene millennial-scale events are common hydroclimatic phenomena at least in the East Asian monsoon system. Meanwhile, the shorter periodicity of millennial-scale events than that of the North Atlantic region is likely to decouple the EASM system from the North Atlantic climate system. This observation suggests that weak EASM and North Atlantic Bond events may have been induced independently by direct solar activity (and then possible feedback) and ocean–ice sheet dynamics, respectively, rather than simple propagation from the North Atlantic to the EASM regions.
Quaternary Science Reviews | 2011
Kyoung Nam Jo; Kyung Sik Woo; Hyoun Soo Lim; Hai Cheng; R. Lawrence Edwards; Yongjin Wang; Xiuyang Jiang; Ryeon Kim; Jae-Il Lee; Ho Il Yoon; Kyu Cheul Yoo
Quaternary Research | 2010
Kyoung Nam Jo; Kyung Sik Woo; Hai Cheng; Lawrence R. Edwards; Yongjin Wang; Ryeon Kim; Xiuyang Jiang
Quaternary International | 2015
Kyung Sik Woo; Hyoseon Ji; Kyoung Nam Jo; Sangheon Yi; Hai Cheng; R. Lawrence Edwards; Gi Hoon Hong
Journal of the geological society of korea | 2011
Hyo Seon Ji; Woo Kyung Sik; Kyoung Nam Jo; Cheng Hai; Edwards R. Lawrence; Sangheon Yi
Nature | 2015
Kyoung Nam Jo; Kyung Sik Woo; Sangheon Yi; Dong Y oon Yang; Hyoun Soo Lim; Yongjin Wang; Hai Cheng; R. Lawrence Edwards
Archive | 2008
K. S. Woo; Kyoung Nam Jo; R. Lawrence Edwards; Hai Fang Cheng; Yun Wang
Journal of the geological society of korea | 2008
Kyoung Nam Jo; Woo Kyung Sik
대한지질학회 학술대회 | 2007
Kyung Sik Woo; Kyoung Nam Jo