Fangjian Xu , Xilin Zhang , Jianwei Xu , Zhilei Sun , Shengqiang Yuan , Xiting Liu
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However, the rise in sea level from 11.3 to 7.3 cal. ka BP resulted in a shift in sediment sources, incorporating contributions from the Changjiang River and/or the continental shelf post-deglaciation to Taiwan, alongside a significant intensification of the KC. This increase in KC intensity is likely correlated with heightened summer insolation in the low latitudes of the Northern Hemisphere and an enhanced East Asian summer monsoon. Additionally, volcanic activity occurring at 7.3 cal. ka BP played a critical role in modifying sediment composition. By 7.3 cal. ka BP, sea levels approximated contemporary conditions, with terrestrial sediments primarily sourced from Taiwan. Around 4.9 cal. ka BP, a marked decrease in KC intensity was observed, potentially influenced by the strengthening of the El Niño-Southern Oscillation, which disrupts subtropical circulation in the North Pacific. The sedimentary records from core C01 illustrate that low-latitude Pacific climate variability since the last deglaciation has significantly impacted changes in sedimentary provenance and environmental conditions in the Okinawa Trough.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"658 ","pages":"Article 112621"},"PeriodicalIF":2.6000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Sea level and low-latitude climate control on sedimentary provenance and paleoenvironmental evolution in the central Okinawa Trough since 19 cal. ka BP\",\"authors\":\"Fangjian Xu , Xilin Zhang , Jianwei Xu , Zhilei Sun , Shengqiang Yuan , Xiting Liu\",\"doi\":\"10.1016/j.palaeo.2024.112621\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study utilizes AMS <sup>14</sup>C dating, grain size analysis, and elemental composition to ascertain the provenance of sediments in core C01, thereby offering insights into the paleoenvironmental evolution of the Okinawa Trough since 19 cal. ka BP. 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Around 4.9 cal. ka BP, a marked decrease in KC intensity was observed, potentially influenced by the strengthening of the El Niño-Southern Oscillation, which disrupts subtropical circulation in the North Pacific. 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引用次数: 0
摘要
本研究利用AMS 14C测年、粒度分析和元素组成来确定岩芯C01中沉积物的来源,从而了解自19 cal. ka BP以来冲绳海槽的古环境演变。在 19.0 至 11.3 cal. ka BP 期间,沉积物主要来自长江,这一现象归因于长江在低海平面时期的向海扩张。在这一时期,黑潮(KC)相对稳定。然而,公元前 11.3 至公元前 7.3 千年海平面的上升导致沉积物来源发生变化,将长江和/或脱冰期后大陆架的沉积物汇入台湾,同时 KC 也显著增强。KC 强度的增加可能与北半球低纬度地区夏季日照增强以及东亚夏季季风增强有关。此外,发生在 7.3 cal. ka BP 的火山活动在改变沉积物组成方面起到了关键作用。到 7.3 cal. ka BP 时,海平面与当代情况接近,陆地沉积物主要来自台湾。约公元前 4.9 千年,KC 强度明显下降,这可能是受厄尔尼诺-南方涛动加强的影响,厄尔尼诺-南方涛动扰乱了北太平洋的副热带环流。来自岩芯 C01 的沉积记录表明,自上一次褪冰以来的低纬度太平洋气候变异极大地影响了冲绳海槽沉积产地和环境条件的变化。
Sea level and low-latitude climate control on sedimentary provenance and paleoenvironmental evolution in the central Okinawa Trough since 19 cal. ka BP
This study utilizes AMS 14C dating, grain size analysis, and elemental composition to ascertain the provenance of sediments in core C01, thereby offering insights into the paleoenvironmental evolution of the Okinawa Trough since 19 cal. ka BP. Between 19.0 and 11.3 cal. ka BP, the sediments were predominantly derived from the Changjiang River, a phenomenon attributed to the river's seaward expansion during periods of low sea level. During this interval, the Kuroshio Current (KC) exhibited relative stability. However, the rise in sea level from 11.3 to 7.3 cal. ka BP resulted in a shift in sediment sources, incorporating contributions from the Changjiang River and/or the continental shelf post-deglaciation to Taiwan, alongside a significant intensification of the KC. This increase in KC intensity is likely correlated with heightened summer insolation in the low latitudes of the Northern Hemisphere and an enhanced East Asian summer monsoon. Additionally, volcanic activity occurring at 7.3 cal. ka BP played a critical role in modifying sediment composition. By 7.3 cal. ka BP, sea levels approximated contemporary conditions, with terrestrial sediments primarily sourced from Taiwan. Around 4.9 cal. ka BP, a marked decrease in KC intensity was observed, potentially influenced by the strengthening of the El Niño-Southern Oscillation, which disrupts subtropical circulation in the North Pacific. The sedimentary records from core C01 illustrate that low-latitude Pacific climate variability since the last deglaciation has significantly impacted changes in sedimentary provenance and environmental conditions in the Okinawa Trough.
期刊介绍:
Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations.
By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.