Long-term variability of the Kuroshio since 1788 based on coral records

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2024-10-18 DOI:10.1016/j.gloplacha.2024.104611

Xiaohua Li , Xinying Guo , Huan Jiang , Xi Lu , Zhanqing Zhang , Jie Ma , Shijian Hu

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引用次数: 0

Abstract

The Kuroshio transports warm water poleward from low- to mid-high latitude regions and strongly affects ocean-atmosphere-land interactions. Previous studies have shown that the Kuroshio has strengthened at its origin during recent decades. However, changes in the Kuroshio on a centennial timescale are unclear due to the lack of observations before the Industrial Revolution. In this study, a precisely dated and monthly resolved Porites coral Sr/Ca record from south of Taiwan island, where coral growth is influenced by the Kuroshio, was used to generate a continuous reconstruction of Kuroshio transport (KT) during the period from 1788 to 2013. The data show a consistent decline in KT since 1788, with the rate of decline increasing since the 1950s, probably due to rapid oceanic warming. The southward shift of the bifurcation latitude of the North Equatorial Current, which is related to accelerated global oceanic warming, might have led to the decrease in KT. Natural variability in the phase transition of the Pacific Decadal Oscillation and El Niño-Southern Oscillation might also influence the long-term changes in KT, particularly before the 1950s.

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基于珊瑚记录的黑潮自 1788 年以来的长期变化情况

黑潮将暖水从低纬度地区向中高纬度地区输送，并对海洋-大气-陆地之间的相互作用产生强烈影响。以往的研究表明，近几十年来，黑潮在其发源地有所增强。然而，由于缺乏工业革命前的观测资料，黑潮在百年时间尺度上的变化尚不清楚。在这项研究中，利用来自台湾岛南部（珊瑚生长受黑潮影响）的精确定年和月解析的海泡石珊瑚 Sr/Ca 记录，生成了 1788 年至 2013 年期间黑潮输送（KT）的连续重建。数据显示，自 1788 年以来 KT 持续下降，自 20 世纪 50 年代以来下降速度加快，这可能是由于海洋迅速变暖所致。北赤道洋流分叉纬度的南移与全球海洋变暖加速有关，可能是导致 KT 下降的原因。太平洋十年涛动和厄尔尼诺-南方涛动的相变也可能影响 KT 的长期变化，特别是 1950 年代以前。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.