https://repository.kopri.re.kr/handle/201206/5184 Thu, 23 Apr 2026 09:30:45 GMT 2026-04-23T09:30:45Z https://repository.kopri.re.kr/handle/201206/6350 Title: Paleometeorology: High resolution Northern Hemisphere wintertime mid-latitude dynamics during the Last Glacial Maximum Authors: M.B. Unterman; D.J. Erickson; Kim, Seong-Joong; T.J. Crowley Abstract: Hourly winter weather of the Last Glacial Maximum (LGM) is simulated using the Community Climate Model version 3 (CCM3) on a globally resolved T170 (∼75 km) grid. Results are compared to a longer LGM climatological run with the same boundary conditions and monthly saves. Hourly-scale animations are used to enhance interpretations. The purpose of the study is to explore whether additional insights into ice age conditions can be gleaned by going beyond the standard employment of monthly average model statistics to infer ice age weather and climate. Results for both LGM runs indicate a decrease in North Atlantic and increase in North Pacific cyclogenesis. Storm trajectories react to the mechanical forcing of the Laurentide Ice Sheet, with Pacific storms tracking over middle Alaska and northern Canada, terminating in the Labrador Sea. This result is coincident with other model results in also showing a significant reduction in Greenland wintertime precipitation ？a response supported by ice core evidence. Higher-temporal resolution puts in sharper focus the close tracking of Pacific storms along the west coast of North America. This response is consistent with increased poleward heat transport in the LGM climatological run and could help explain "early" glacial warming inferred in this region from proxy climate records. Additional analyses shows a large increase in central Asian sundary conditions and monthly saves. Hourly-scale animations are used to enhance interpretations. The purpose of the study is to explore whether additional insights into ice age conditions can be gleaned by going beyond the standard employment of monthly average model statistics to infer ice age weather and climate. Results for both LGM runs indicate a decrease in North Atlantic and increase in North Pacific cyclogenesis. Storm trajectories react to the mechanical forcing of the Laurentide Ice Sheet, with Pacific storms tracking over middle Sat, 01 Jan 2011 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6350 2011-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6079 Title: Spring Arctic Oscillation-East Asian summer monsoon connection through circulation changes over the western North Pacific Authors: Dao-Yi Gong; Tianjun Zhou; Dong Guo; Kim, Seong-Joong; Miao Hu; Yongqi Gao; Jing Yang Abstract: In the present study the links between spring Arctic Oscillation (AO) and East Asian summer monsoon (EASM) was investigated with focus on the importance of the North Pacific atmospheric circulation and sea surface temperature (SST). To reduce the statistical uncertainty, we analyzed high-pass filtered data with the inter-annual time scales, and excluded the El Ni？no/Southern Oscillation signals in the climate fields using a linear fitting method. The significant relationship between spring AO and EASM are supported by the changes of multi-monsoon components, including monsoon indices, precipitation, and three-dimensional atmospheric circulations. Following a stronger positive spring AO, an anomalous cyclonic circulation at 850 hPa appears in southeastern Asia and the western North Pacific in summer, with the easterly anomalies spanning from the Pacific to Asian continent along 25°N？0°N and the westerly anomalies south of 15°N. At the same time, the summer western North Pacific subtropical high becomes weaker. Consistently, the positive precipitation anomalies are developed over a broad region south of 30°N stretching from southern China to the western Pacific and the negative precipitation anomalies appear in the lower valley of the Yangtze River and southern Japan. The anomalous cyclone in the western North Pacific persisting from spring to summer plays a key role in mreduce the statistical uncertainty, we analyzed high-pass filtered data with the inter-annual time scales, and excluded the El Ni？no/Southern Oscillation signals in the climate fields using a linear fitting method. The significant relationship between spring AO and EASM are supported by the changes of multi-monsoon components, including monsoon indices, precipitation, and three-dimensional atmospheric circulations. Following a stronger positive spring AO, an anomalous cyclonic circulation at 850 hPa appears in southeastern Asia and the Sat, 01 Jan 2011 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6079 2011-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6444 Title: Understanding ENSO Regime Behavior upon an Increase in the Warm-Pool Authors: Kim, Baek-Min; An, Soon-Il Abstract: The regime behavior of the low-order ENSO model, according to an increase in the radiative？convective equilibrium sea surface temperature (SST;Tr) is studied to provide a possible explanation for the observed increase in ENSO irregularity characterized by decadal modulation. A bifurcation analysis with Tr as a control parameter is conducted to reveal that the degree of ENSO irregularity in the model is effectively controlled by the equilibrium states of the model. At a critical value of Tr, bifurcation analysis reveals that period-doubling bifurcation occurs and an amplitude-modulated ENSO emerges. As Tr increases further, nested oscillations are successively generated, illustrating clear decadal modulation of ENSO. The qualitative regime changes revealed in this study are supported by the observation of regime shifts in the 1970s. Sat, 01 Jan 2011 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6444 2011-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8533 Title: Climate Response Over Asia and Arctic to Change in Orbital Parameters for the Last Interglacial Maximum Authors: Kim, Baek-Min; Choi, Taejin; Lee, Sang H.; Kim, Yoojin; Lue, Jun Mei; Kim, Seong-Joong; Woo, Sung-Ho; Lee, Bang Yong Abstract: The climate response over Asia/Arctic to the change in orbital parameters for the last interglacial maximum (LIGM) is investigated using the NCAR CCM3. With LIGM orbital parameters, the insolation decreases in January and increases in July in the northern hemisphere. The reduced net short-wave radiative heat fluxes in January lead to the surface cooling in low to mid latitudes of Asia, whereas a warming is obtained in northern Asia where the net short-wave radiative heat fluxes change little. The January warming in northern Asia/Arctic in the LIGM, consistent with proxy records, is mainly due to the marked increase in downward long wave heat fluxes associated with the increase in cloud. In July, the increased insolation leads to the surface warming over most Asia, even though a slight cooling is obtained in low latitudes in spite of the increase in insolation, due to the decrease in the short-wave heat fluxes at the surface by the increase in the cloud amount. Precipitation overall increases at south and east Asia in July, due to the stronger southwest and southerly winds. The change in insolation due to the orbital parameters determines the climate change pattern in low- to mid-latitudes over Asia in the LIGM, even though the degree of climate change is much lower than suggested by proxy estimates. The results obtained in this study implies that, under future global warming, the change in greenhouse effect associated with cloud feedback could play an important role in determining the climate change over Asia/Arctic. Fri, 01 Jan 2010 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/8533 2010-01-01T00:00:00Z