Bae Si Woong, Lee Kyung Eun, Ko Tae Wook, Kim Ryoung Ah, Park Young-Gyu
Ocean Science and Technology School, Korea Maritime and Ocean University, Busan, 49112, South Korea.
Department of Ocean Science, Korea Maritime and Ocean University, Busan, 49112, South Korea.
Sci Rep. 2022 Sep 3;12(1):15046. doi: 10.1038/s41598-022-19050-6.
The climate periodically fluctuates on various time scales, however, there remains a lack of consensus on the centennial-scale variabilities and associated driving force. A continuous high-resolution sea surface temperature (SST) record allows for the detection of centennial-scale fluctuations. This study presents a high-resolution SST record covering the last 10,000 years based on the analysis of the alkenone unsaturation index in marine sediment cores off the southwest coast of the Korean Peninsula. Alkenone SST's spectral and wavelet analysis revealed significant periodicities of 414, 190, 135, 102, and 89 years at a > 90% confidence level. These cycles exhibit extreme proximity to the solar activity cycles of 353, 206 (Suess/de Vries cycles), 130, and 104-87 years (Gleissberg cycles), suggesting that the multidecadal to centennial variations in SST are linked to solar forcing. To the best of our knowledge, this is the first high-resolution Holocene SST record that all solar activity cycles on centennial scale match, suggesting centennial-scale variability in the climate system and illustrating the role of solar activity on SST change in the mid-latitude region of the Northern Hemisphere.
气候在不同时间尺度上周期性波动，然而，对于百年尺度的变率及其相关驱动力仍缺乏共识。连续的高分辨率海表面温度（SST）记录有助于检测百年尺度的波动。本研究基于对朝鲜半岛西南海岸外海洋沉积物岩芯中烯酮不饱和度指数的分析，给出了过去10000年的高分辨率SST记录。烯酮SST的频谱和小波分析显示，在置信水平>90%时，存在414、190、135、102和89年的显著周期。这些周期与353、206（苏斯/德弗里斯周期）、130和104 - 87年（格莱斯堡周期）的太阳活动周期极为接近，这表明SST的年代际到百年尺度变化与太阳强迫有关。据我们所知，这是首个百年尺度上所有太阳活动周期都匹配的高分辨率全新世SST记录，表明气候系统存在百年尺度的变率，并说明了太阳活动在北半球中纬度地区SST变化中的作用。
