期刊
QUATERNARY RESEARCH
卷 109, 期 -, 页码 53-64出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/qua.2022.13
关键词
ENSO; Holocene; ITCZ; Nakdong River; Nakdong extreme flooding (NEF) event; XRF core scanning; Typhoon activity
资金
- Korea Institute of Geoscience and Mineral Resources (KIGAM) [GP2020-003(2-3111-3), GP2022-005(22-3807)]
This study reconstructs the changes in decadal-scale extreme flooding events from floodplain sediments in the middle reach of the Nakdong River in Korea. The findings reveal a significant change in the frequency of extreme events around 3700 years ago in East Asia and demonstrate the importance of investigating the role of past deep-water circulation in hydroclimate changes.
The history of past hydroclimatic extreme events, essential information for predicting future changes, is preserved in fluvial sediments. Here, we reconstruct changes in decadal-scale extreme flooding events over the period 7700-1700 cal yr BP from floodplain sediments in the middle reach of the Nakdong River, Korea, based on lithogenic elemental ratios (e.g., Zr/Ti and Sr/Si). For example, Nakdong extreme flooding (NEF) events frequently occurred at 7700, 7200, 6000, 5000, 3800, 3200, 2900, 2600, 2300, 2000, and 1700 cal yr BP, and were associated with higher sea-surface temperatures and strong El Nino-Southern Oscillation (ENSO) activity. Notably, we found a significant change in the frequency of extreme events ca. 3700 cal yr BP over East Asia. The hydroclimate fluctuated with dominant periodicities of 950 and 540 years in 7700-3700 cal yr BP and shorter centennial to decadal cycles (320, 110-120, and 60-75 years) in 3700-1700 cal yr BP. This 3.7-ka climatic shift is consistent with a marked southward shift of the intertropical convergence zone, intensified ENSO activity, increased frequency of recurving typhoons, and deep-ocean circulation changes in both the northern and southern hemispheres, demonstrating the urgent need for investigating the critical role of past deep-water circulation in hydroclimate changes.
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