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Factors controlling typhoons and storm rain on the Korean Peninsula during the Little Ice Age
Katsuki, K.,Yang, D. Y.,Seto, K.,Yasuhara, M.,Takata, H.,Otsuka, M.,Nakanishi, T.,Yoon, Y.,Um, I. K.,Cheung, R. C. Springer Science + Business Media 2016 Journal of paleolimnology Vol.55 No.1
<P>Documenting multi-decadal typhoon and storm-rain variability is useful to prevent future typhoon and flood disasters. We present the history of typhoon and storm-rain activity in East Asia inferred from multi-proxy analyses of Lagoon Hwajin-po sediments along the eastern coast of Korea. Anthropogenic effects were enhanced in Lagoon Hwajin-po since ca. AD 1900, by increasing farming in the catchment. To avoid these human-induced effects, we reconstructed the history of typhoon and storm-rain activity only for the interval AD 1400-1900. The record indicates that typhoon frequency throughout the Korean Peninsula varied in response to the state of the El Nio/Southern Oscillation. Typhoon variability was likely modulated further by the state of the East Asia summer monsoon (EASM) pattern, associated with variation in the magnitude of solar irradiance. During periods of minimum solar activity, such as the early Maunder Minimum (AD 1650-1675), typhoons struck the east China coast and Korean Peninsula more frequently because of a strengthened EASM.</P>
Edge profile measurements using Thomson scattering on the KSTAR tokamak.
Lee, J H,Oh, S,Lee, W R,Ko, W H,Kim, K P,Lee, K D,Jeon, Y M,Yoon, S W,Cho, K W,Narihara, K,Yamada, I,Yasuhara, R,Hatae, T,Yatsuka, E,Ono, T,Hong, J H American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>In the KSTAR Tokamak, a 'Tangential Thomson Scattering' (TTS) diagnostic system has been designed and installed to measure electron density and temperature profiles. In the edge system, TTS has 12 optical fiber bundles to measure the edge profiles with 10-15 mm spatial resolution. These 12 optical fibers and their spatial resolution are not enough to measure the pedestal width with a high accuracy but allow observations of L-H transition or H-L transitions at the edge. For these measurements, the prototype ITER edge Thomson Nd:YAG laser system manufactured by JAEA in Japan is installed. In this paper, the KSTAR TTS system is briefly described and some TTS edge profiles are presented and compared against the KSTAR Charge Exchange Spectroscopy and other diagnostics. The future upgrade plan of the system is also discussed in this paper.</P>