气候变化领域集成服务门户(CCPortal): High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan

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DOI	10.1016/j.quascirev.2019.106160
	High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan
	Kajita H.; Harada N.; Yokoyama Y.; Sato M.; Ogawa N.; Miyairi Y.; Sawada C.; Suzuki A.; Kawahata H.
发表日期	2020
ISSN	0277-3791
卷号	230
英文摘要	The regional paleoenvironmental record of Tokyo, central Japan, is required to enrich our understanding of climate change in East Asia and its impact on Japanese civilizations. Previous studies have generated paleotemperature records based on the analysis of shell mounds along the coast of Tokyo Bay and pollen from terrestrial borehole cores. However, a continuous, high time-resolution, quantitative paleotemperature record does not exist. A piston core was recovered from Tokyo Bay from which 22 mollusk shells were extracted. An age model for the core, determined via accelerator mass spectroscopy (AMS) 14C dating of the shells and a scoria layer from the Hoei eruption (1707 CE), showed that the core contains continuous record from ca. 2400 BCE. We analyzed the alkenone unsaturation ratios (UK’ 37) to reconstruct the variations in the paleotemperature. The temperature during the Meghalayan was generally warmer than that at present exhibiting a declining trend, which roughly matches the changes in the orbital-forcing summer insolation and the millennial-scale latitudinal shift of the subarctic front in the northeastern Pacific Ocean. The largest cold period, which occurred ca. 2300 BCE and had a minimum temperature of 19.5 °C, interrupted the warm conditions. This cold period may correspond to the global cooling/drying “4.2 ka BP event,” which marks the boundary between the Northgrippian and Meghalayan. Our results also revealed that several cold periods occurred, which may have been caused by decreases in solar activity or large volcanic eruptions. Particularly, large decadal to centennial-scale cold periods were observed ca. 440 BCE and 100 CE during the Yayoi era (ca. 900 BCE–300 CE). The coldest period after the establishment of a centralized system of government (ca. 300 CE–present) was recorded ca. 1050 CE, which may have been caused by the combination of a strong El-Niño mode and reduced solar activity. These climate change events can all be linked and, therefore, may be the potential causes of significant periods of famine and civil war in Japanese history, which eventually led to major shifts in Japanese social systems. © 2020 Elsevier Ltd
英文关键词	Alkenone biomarker; Meghalayan; Paleoclimatology; Tokyo Bay
语种	英语
scopus关键词	Food supply; Mass spectrometry; Solar energy; Solar radiation; Volcanoes; Accelerator mass spectroscopy; Alkenones; High-time resolution; Meghalayan; Minimum temperatures; North-eastern Pacific; Paleoclimatology; Tokyo Bay; Climate change; alkenone; biomarker; paleoclimate; paleotemperature; Honshu; Japan; Kanto; Tokyo Bay
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151588
作者单位	Atmosphere and Ocean Research Institute, The University of Tokyo, Japan; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Japan; Research Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Japan; Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan; National Institute of Polar Research, Japan
推荐引用方式 GB/T 7714	Kajita H.,Harada N.,Yokoyama Y.,et al. High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan[J],2020,230.
APA	Kajita H..,Harada N..,Yokoyama Y..,Sato M..,Ogawa N..,...&Kawahata H..(2020).High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan.Quaternary Science Reviews,230.
MLA	Kajita H.,et al."High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan".Quaternary Science Reviews 230(2020).