气候变化领域集成服务门户(CCPortal): Anthropocene North Western Pacific Oceanography Recorded as Seasonal-Resolution Radiocarbon in Coral From Kikai Island, Japan

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DOI	10.1029/2023GB007927
	Anthropocene North Western Pacific Oceanography Recorded as Seasonal-Resolution Radiocarbon in Coral From Kikai Island, Japan
	Zeng, Yuning; Yokoyama, Yusuke; Hirabayashi, Shoko; Miyairi, Yosuke; Suzuki, Atsushi; Aze, Takahiro; Kawakubo, Yuta
发表日期	2024
ISSN	0886-6236
EISSN	1944-9224
起始页码	38
结束页码	4
卷号	38 期号:4
英文摘要	Radiocarbon (14C) in corals can be used as a relatively high-sensitivity indicator of vertical and horizontal advection of water masses, which contributes to the understanding of ocean circulation. In this study, we reconstruct Kuroshio and Ryukyu current transport with a seasonal resolution Delta 14C record spanning 1947-2009. This record covers the beginning of the atomic era and was obtained from a coral on Kikai Island in the south of Japan. The Kikai Delta 14C curve features a newly discovered Delta 14C spike in July 1955, a rapid increase after 1962, and a steady decrease after 1980. The spike in 1955 may directly reflect ocean current transport. The lack of periodicity in the Delta 14C record suggests the existence of mesoscale eddies and the complexity of Kuroshio and Ryukyu current transport. In addition, comparing the high-resolution Delta 14C of Kikai and Ishigaki islands, both situated along the path of the Kuroshio, reveals the influence of Pacific Decadal Oscillation and El Ni & ntilde;o-Southern Oscillation on the Kuroshio and Ryukyu currents. This suggests that seasonally resolved Delta 14C in corals along an ocean current can produce a long-term record of ocean mixing that responds to climate variability. The Kuroshio Current and Ryukyu Current in the western North Pacific play important roles in the climate of East Asia since they bring rain and transport heat from low latitudes to higher latitudes. However, due to a lack of long-term continuous high-resolution records, the detailed understanding of those currents is limited. Radiocarbon (14C) generated by natural and anthropogenic activities is incorporated into the ocean and taken up by corals, which vary with different locations and water depths. Coral 14C can be a very sensitive indicator of vertical and horizontal advection of water masses. Here, we present a coral 14C record in 1947-2009 from Kikai Island in the south of Japan. The coral 14C record captures clear signatures of vertical mixing and effects of gyres near Kikai Island. The seasonal-resolution record shows no continuous periodicity, reflecting variable Kuroshio and Ryukyu current transport and mesoscale eddies. These data also support the idea that Kuroshio and Ryukyu current transport is affected by the Pacific Decadal Oscillation and El Ni & ntilde;o-Southern Oscillation. A Delta 14C spike is observed in 1955 in Kikai and it may reflect the condition of ocean current transport Lack of periodicity in Delta 14C record possibly reflects mesoscale eddies and complex Kuroshio and Ryukyu Current variability Kuroshio and Ryukyu Current are influenced by global climate change such as Pacific Decadal Oscillation and El Ni & ntilde;o-Southern Oscillation
英文关键词	radiocarbon; coral; Kuroshio Current; Ryukyu Current
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001206142800001
来源期刊	GLOBAL BIOGEOCHEMICAL CYCLES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306563
作者单位	University of Tokyo; University of Tokyo; University of Tokyo; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); Australian National University; National Institute of Advanced Industrial Science & Technology (AIST)
推荐引用方式 GB/T 7714	Zeng, Yuning,Yokoyama, Yusuke,Hirabayashi, Shoko,et al. Anthropocene North Western Pacific Oceanography Recorded as Seasonal-Resolution Radiocarbon in Coral From Kikai Island, Japan[J],2024,38(4).
APA	Zeng, Yuning.,Yokoyama, Yusuke.,Hirabayashi, Shoko.,Miyairi, Yosuke.,Suzuki, Atsushi.,...&Kawakubo, Yuta.(2024).Anthropocene North Western Pacific Oceanography Recorded as Seasonal-Resolution Radiocarbon in Coral From Kikai Island, Japan.GLOBAL BIOGEOCHEMICAL CYCLES,38(4).
MLA	Zeng, Yuning,et al."Anthropocene North Western Pacific Oceanography Recorded as Seasonal-Resolution Radiocarbon in Coral From Kikai Island, Japan".GLOBAL BIOGEOCHEMICAL CYCLES 38.4(2024).