The 1500-year climate oscillation in the midlatitude North Pacific during the Holocene
The 1500-year climate oscillation in the midlatitude North Pacific during the Holocene
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DOI：
10.1130/g25667a.1
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发表时间：
2009-07-01
期刊：
影响因子：
5.8
通讯作者：
Kawahata, Hodaka
中科院分区：
文献类型：
--
作者：
Isono, Dai;Yamamoto, Masanobu;Kawahata, Hodaka
末次冰期的亚轨道气候变率被认为涉及1500年的起搏周期，但间冰期类似于1500年的振荡的表现和空间分布尚不清楚。我们生成了日本中部附近西北太平洋全新世期间的烷酮类海表面温度(SST)的数十年分辨率记录。SST记录显示，在整个全新世，SST的变化幅度类似于1摄氏度。对海温变化的频谱分析表明，海温变化有一个统计上显著的峰值，其周期为1470年。海温的变化与北大西洋沉积物中冰排赤铁矿染色颗粒含量的变化部分相关。这些发现表明，黑潮延伸区的平均纬度在1500年的周期内变化，并表明北太平洋环流系统与高纬度北大西洋温盐环流之间存在气候联系。在整个全新世和最后一次冰川时期都可以看到每隔1500年有规律的起伏，这表明这种振荡是对外部强迫的反应。
Suborbital climate variability during the last glacial period is suggested to have involved a 1500-year pacing cycle, but the expression and spatial distribution of the similar to 1500-year oscillation during interglacials remains unclear. We generated a multidecade resolution record of alkenone sea surface temperature (SST) in the northwestern Pacific off central Japan during the Holocene. The SST record showed centennial and millennial variability with an amplitude of similar to 1 degrees C throughout the entire Holocene. Spectral analysis for SST variation revealed a statistically significant peak with 1470-year periodicity. The SST variation partly correlated with the variations of ice-rafted hematite-stained grain content in North Atlantic sediments. These findings indicate that the mean latitude of the Kuroshio Extension has varied on a 1500-year cycle, and suggest that a climatic link exists between the North Pacific gyre system and the high-latitude North Atlantic thermohaline circulation. The regular pacing at 1500-year intervals seen throughout both the Holocene and the last glacial period suggests that the oscillation was a response to external forcing.