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Shelf-break glaciation and an extensive ice shelf beyond northwest Greenland at the Last Glacial Maximum 末次冰期格陵兰岛西北部的断裂冰川和大面积冰架
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-08-13 DOI: 10.1016/j.margeo.2024.107375

The analysis of seafloor glacial landforms can provide important constraints on the past behaviour of ice sheets, including their extent at the Last Glacial Maximum and the controls on their subsequent retreat. The continental shelf and slope offshore of northwest Greenland have been sparsely surveyed, however, limiting our understanding of ice sheet extent and dynamics in this sector during the pre-satellite era. Here we use newly acquired high-resolution geophysical data to map and interpret the distribution of glacial landforms across the hitherto unexplored banks of northern Melville Bay and the adjacent slope and deep-sea basin. In contrast to previous conceptual models, our seafloor observations suggest that shelf-break glaciation was attained along the entire northwest Greenland margin at the Last Glacial Maximum, including beyond the shallow banks. The landforms that we map on the continental slope provide strong support for the existence of an ice shelf spanning northern Baffin Bay. Sub-ice shelf keel scours in water depths of down to 1220 m reveal that this ice shelf was at least 1100 m thick at its grounding zone. The orientation of sub-ice shelf landforms suggests that the ice shelf was fed mainly by the supply of ice to northern Baffin Bay from the Lancaster Sound Ice Stream of the Canadian Arctic Archipelago. The Baffin Bay ice shelf buttressed several large ice streams of the Greenland, Innuitian and Laurentide ice sheets at the Last Glacial Maximum, and its break-up may have contributed to instigating the deglacial retreat of these ice streams from the shelf edge.

对海底冰川地貌的分析可以为冰原过去的行为提供重要的制约因素,包括冰原在末次冰川最盛时期的范围以及对其随后消退的控制。然而,对格陵兰岛西北部近海大陆架和斜坡的勘测很少,这限制了我们对前卫星时代该地区冰盖范围和动态的了解。在这里,我们利用新获得的高分辨率地球物理数据,绘制并解释了迄今为止尚未勘探的梅尔维尔湾北部两岸冰川地貌的分布情况,以及邻近的斜坡和深海盆地。与之前的概念模型不同,我们的海底观测结果表明,在末次冰川极盛时期,整个格陵兰岛西北边缘都出现了陆架断裂冰川作用,包括浅滩以外的地区。我们在大陆坡上绘制的地貌为横跨巴芬湾北部的冰架的存在提供了有力的支持。在水深达 1220 米的冰架下龙骨冲刷显示,该冰架的着陆区至少有 1100 米厚。冰架下地貌的走向表明,该冰架主要由加拿大北极群岛兰开斯特湾冰流向巴芬湾北部提供的冰供给。巴芬湾冰架在末次冰川极盛时期支撑着格陵兰、因努伊特和劳伦泰德冰原的几大冰流,它的断裂可能促使这些冰流从冰架边缘退缩。
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引用次数: 0
Storm surge in Spain: Factors and effects on the coast 西班牙的风暴潮:因素及对海岸的影响
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-08-10 DOI: 10.1016/j.margeo.2024.107373

Storm surge is a fundamental process to understanding the behaviour of sea level. This variable, which depends on atmospheric pressure and wind action, has been widely documented. However, few studies quantify these relationships for various geographic areas. This study analyses the most influential factors in the variation of storm surges at several points on the Spanish coast. The results show that the event duration and the regional geographic factor are very relevant in the correlation of storm surge with pressure drop, so assigning a single value as has been commonly done, typically 1 cm/hPa, is an error. The Mediterranean Sea experiences a greater sensitivity to the atmospheric pressure drop than the Atlantic Ocean, with sea level rise of up to 2 or 3 cm/hPa for a storm surge event below 40 h, compared to those of 1.5 cm/hPa for the Atlantic Ocean. Additionally, higher wind speeds intensify storm surge, whether it results in positive or negative superelevation. However, the storm surge does not always increase when the wind blows towards the coast but also depends on the location of the water masses and the continent. Finally, there is no perception of a growing trend of storm surges in the context of climate change in a general way. A precise knowledge of these elements will help all those agents involved in coastal protection to define more accurate alert levels, enhancing safety along the waterfront.

风暴潮是了解海平面变化的一个基本过程。这一变量取决于大气压力和风的作用,已被广泛记录。然而,很少有研究对不同地理区域的这些关系进行量化。本研究分析了西班牙海岸多处风暴潮变化中最具影响力的因素。结果表明,事件持续时间和区域地理因素与风暴潮与气压下降的相关性密切相关,因此像通常所做的那样指定一个单一值(通常为 1 厘米/hPa)是错误的。与大西洋相比,地中海对大气压降的敏感度更高,40 h 以下的风暴潮事件海平面上升可达 2 或 3 cm/hPa,而大西洋为 1.5 cm/hPa。此外,较高的风速会加剧风暴潮,无论是正向还是负向的超高。不过,风暴潮并不总是在风吹向海岸时才会增加,还取决于水团和大陆的位置。最后,从总体上看,在气候变化的背景下,风暴潮没有增长的趋势。对这些因素的准确了解将有助于所有参与海岸保护的人员确定更准确的警戒级别,从而加强海滨的安全。
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引用次数: 0
Characterizing the sediment dynamics through in-situ measurements in the abyssal Manila Trench, northeast South China Sea 通过对南海东北部深海马尼拉海沟的原位测量确定沉积物动力学特征
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-08-08 DOI: 10.1016/j.margeo.2024.107372

Abyssal sedimentary dynamic processes are crucial to be understanding the transport and distribution of material (sediment, carbon, plastics, etc.) and the formation of deep-sea bedforms. Accurately characterizing such complicated processes requires a multi-faceted approaches (e.g. numercial models, physical experiments, field observation), among which in-situ field data gathering has been the most challenging. In this study, we collected data from four bottom moorings deployed along the Manila Trench in the northeast South China Sea to investigate the sediment transport processes at the trench bottom. The events with high turbidity, including strong and fast gravity flow and weaker turbidity currents with speed similar to tidal currents, transport sediment down-trench. Sediment particles in the northern part of the trench were generally found to move northward (i.e. up the trench) with seasonal variations primarily influenced by the asymmetrical subtidal currents. During the intensification of northbound subtidal current, the benthic nepheloid layers in Gaoping Canyon, which feeds into the trench, might be transported to the north of trench. Furthermore, a weaker turbidity oscillation at S2 tidal frequencies was observed before turbidity current occurred, increasing sediment transport to the deep. It was hypothesized that multiple small turbidity currents may have been triggered by an earthquake, despite not reaching the mooring S2, with the fine sediment being transported downstream by abyssal tidal currents.

深海沉积动态过程对于了解物质(沉积物、碳、塑料等)的迁移和分布以及深海床 形的形成至关重要。准确描述这种复杂的过程需要多方面的方法(如数字模型、物理实验、现场观测),其中现场数据收集最具挑战性。在本研究中,我们收集了沿南海东北部马尼拉海沟布设的四个海底锚系设备的数据,以研究海沟底部的沉积物运移过程。高浊度事件,包括强大而快速的重力流和速度与潮汐流相似的较弱浊流,将沉积物向海沟下方输送。海沟北部的沉积物颗粒一般向北(即海沟上部)移动,其季节性变化主要受不对称潮下流的影响。在北向潮下流增强时,注入海沟的高平峡谷底栖软泥层可能被搬运到海沟北部。此外,在浊流发生之前,在 S2 潮汐频率处观测到较弱的浊度振荡,增加了向深海的沉积物运移。据此推测,地震可能引发了多股小型浊流,尽管这些浊流没有到达 S2 系泊点,但细小的沉积物被深海潮流带到了下游。
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引用次数: 0
Holocene palaeoenvironmental development of Prokljan Lake (Krka River, Croatia): Evolution from a calcareous tufa barrier system to a karst estuary Prokljan 湖(克罗地亚克尔卡河)全新世古环境发展:从钙质页岩屏障系统到岩溶河口的演变
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-08-06 DOI: 10.1016/j.margeo.2024.107370

The upstream part of the karst estuary of the Krka River (Prokljan Lake) on the Eastern Adriatic Coast was studied by combining high-resolution seismic data, analyses on sediment cores, and radiocarbon dating to reconstruct the late Quaternary stratigraphy of the estuary. The sedimentary infill consists of up to 20 m of freshwater and estuarine deposits divided into four seismostratigraphic units corresponding to several stages of development since the last glacial period. The lowstand stage is assumed to correspond to fluvial incision and sediment bypass associated with glacial periods. The postglacial transgressive stage is marked by the growth of calcareous tufa barriers and fluvio-lacustrine deposition. The onset of marine influence in the estuary (Prokljan Lake) was recorded at the beginning of the Holocene (>10,500 cal y BP) with the deposition of brackish sediments with a strong freshwater influence. Calcareous tufa barriers prevented direct rapid flooding of Prokljan Lake in the period from >10,500 cal y to ∼7200 cal y BP. Finally, the transgressive brackish deposition changed to estuarine/marine highstand deposition in a salt-wedge estuary during the late Holocene (∼4000–3000 cal y BP). The late Quaternary deposition in this unique karst setting showed dramatic changes. It was primarily influenced by rapid sea-level rise, climate changes, estuarine geomorphology and relatively low sediment supply.

通过结合高分辨率地震数据、沉积物岩心分析和放射性碳年代测定,对东亚得里亚海沿岸克尔卡河(普罗克连湖)岩溶河口上游部分进行了研究,以重建河口第四纪晚期地层。沉积填充物由长达 20 米的淡水和河口沉积物组成,分为四个地震地层单元,分别对应上一个冰川期以来的几个发展阶段。低地阶段被假定为与冰川期相关的河道内切和沉积物绕流阶段。冰川期后的横切阶段的特征是钙质页岩壁垒的生长和河流-湖泊沉积。河口(普罗克连湖)开始受到海洋的影响是在全新世初期(大于 10,500 卡年 BP),咸水沉积物的沉积带有强烈的淡水影响。在大于 10,500 卡年至公元前 7,200 卡年期间,石灰质页岩屏障阻止了普罗克连湖直接快速泛滥。最后,在全新世晚期(公元前 4000-3000 年),横向咸水沉积转变为盐边河口的河口/海洋高地沉积。在这一独特的岩溶环境中,第四纪晚期的沉积发生了巨大变化。它主要受到海平面快速上升、气候变化、河口地貌和相对较少的沉积物供应的影响。
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引用次数: 0
Nonnegligible contribution of terrigenous sediment inputs from local small watersheds to west regions of the Pearl River Estuary, northern South China Sea shelf 南海北部陆架珠江口西部地区局部小流域的陆源沉积物输入的不可忽略贡献
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-08-02 DOI: 10.1016/j.margeo.2024.107369

As a crucial “sink” for terrigenous material entering the ocean, provenance of sediments within the coastal zone and continental shelf sea regions holds significant scientific importance in the investigation of global material cycling. Environmental magnetism was proved as an effective and rapid approach for sediment source identification. Detail and systematic magnetic measurements were performed for surface sediment samples collected from the mega Pearl River, local small rivers (Tan, Moyang and Jian rivers) of west Guangdong, coastal zone (CZ) and continental shelf (CS) to analyze the contribution of local small watersheds to marine sediments. The results indicate that detrital river input magnetite and hematite are coexisted in both CZ and CS sediments. Compared to CZ sediments, relatively higher concentration of hematite and finer grain size of magnetite are appeared at CS sediments. By comparing of magnetic parameters, it was inferred that magnetic minerals from the Pearl and Tan rivers are transported and deposited on the coastal zone by Guangdong longshore current. Meanwhile, sediment magnetic parameters in the Moyang and Jian Rivers are similar to the CS sediments, implying the two rivers-sourced materials were directly transported and deposited at the CS due to their narrow and restricted estuaries, and/or the CS preserves the residual deposits from the two rivers formed during the Last Glacial. Except for the Pearl River, sources of local small rivers significantly contribute to marine sediments at the coastal zone and continental shelf.

作为进入海洋的土著物质的重要 "汇",沿岸带和大陆架海区沉积物的来源在研究全球物质循环方面具有重要的科学意义。环境磁学被证明是一种有效而快速的沉积物来源识别方法。对从特大珠江、粤西局部小河流(潭江、漠阳江和鉴江)、海岸带(CZ)和大陆架(CS)采集的表层沉积物样品进行了详细和系统的磁学测量,以分析局部小流域对海洋沉积物的贡献。结果表明,河流输入的磁铁矿和赤铁矿在 CZ 和 CS 沉积物中共存。与 CZ 沉积物相比,CS 沉积物中赤铁矿浓度相对较高,磁铁矿粒度较细。通过磁性参数的比较,可以推断珠江和潭江中的磁性矿物是由广东长岸流搬运沉积到海岸带的。与此同时,漠阳江和鉴江的沉积物磁性参数与 CS 沉积物相似,这意味着这两条河流的物质由于河口狭窄和受限而被直接搬运并沉积在 CS,或者 CS 保存了这两条河流在末次冰川时期形成的残余沉积物。除珠江外,当地小河流的源头对海岸带和大陆架的海洋沉积物贡献很大。
{"title":"Nonnegligible contribution of terrigenous sediment inputs from local small watersheds to west regions of the Pearl River Estuary, northern South China Sea shelf","authors":"","doi":"10.1016/j.margeo.2024.107369","DOIUrl":"10.1016/j.margeo.2024.107369","url":null,"abstract":"<div><p>As a crucial “sink” for terrigenous material entering the ocean, provenance of sediments within the coastal zone and continental shelf sea regions holds significant scientific importance in the investigation of global material cycling. Environmental magnetism was proved as an effective and rapid approach for sediment source identification. Detail and systematic magnetic measurements were performed for surface sediment samples collected from the mega Pearl River, local small rivers (Tan, Moyang and Jian rivers) of west Guangdong, coastal zone (CZ) and continental shelf (CS) to analyze the contribution of local small watersheds to marine sediments. The results indicate that detrital river input magnetite and hematite are coexisted in both CZ and CS sediments. Compared to CZ sediments, relatively higher concentration of hematite and finer grain size of magnetite are appeared at CS sediments. By comparing of magnetic parameters, it was inferred that magnetic minerals from the Pearl and Tan rivers are transported and deposited on the coastal zone by Guangdong longshore current. Meanwhile, sediment magnetic parameters in the Moyang and Jian Rivers are similar to the CS sediments, implying the two rivers-sourced materials were directly transported and deposited at the CS due to their narrow and restricted estuaries, and/or the CS preserves the residual deposits from the two rivers formed during the Last Glacial. Except for the Pearl River, sources of local small rivers significantly contribute to marine sediments at the coastal zone and continental shelf.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025322724001531/pdfft?md5=017d409748fc64c8814f47132bed8a3b&pid=1-s2.0-S0025322724001531-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Provenance shift of the abyssal plains in the Southwest sub-basin of the South China Sea at ∼ 8 Ma: Tectonics & climate changes implication 南海西南次盆地深海平原在 ∼ 8 Ma 的成因转变:构造和气候变化的影响
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-07-31 DOI: 10.1016/j.margeo.2024.107368

Tectonic processes and climatic changes are recognized as two major drivers of erosion along the southeastern margin of the Tibetan Plateau and consequently are the main factors controlling depositional patterns along the margins of the South China Sea. However, the role of tectonics and climate in governing the types and patterns of sedimentation in the abyssal plains is relatively little known. The results of International Ocean Discovery Program (IODP) drilling in the abyssal plains of the Southwest sub-basin of the South China Sea show that the multi-trace element and rare earth element (REE) character of sediments older than ∼8 Ma are in disorder. εNd(0) and 87Sr/86Sr values exhibit large fluctuations, which implies temporally variable sediment sources during the early post-spreading stage of the South China Sea. High εNd(0) and low 87Sr/86Sr values and abundant Cenozoic (13–35 Ma) zircon grains in the sediments suggest relatively juvenile sources for their origins, such as the Cagayan Ridge and Palawan Block in the south before ∼8 Ma. Multi-trace element and REE patterns of sediments younger than ∼8 Ma are more uniform. Low εNd(0) and high 87Sr/86Sr values of the sediments indicate that more continentally-derived sediments were transported to the abyssal plain. Coastal rivers in SE Vietnam, and the Mekong and Red Rivers in the west gradually became the major detrital sources of abyssal sediments in the Southwest sub-basin after ∼8 Ma. The switching of the sediment sources from the south to the west is consistent with the progressive uplift of the Vietnamese Central Highlands (VCH) and the SE Tibetan Plateau margin during the Late Miocene. The strengthened summer monsoon since ∼5 Ma affected not only the marginal basins, but also the deep abyssal basins. We argue that the regional tectonics shaped and controlled the shift of provenance and sediment routing system, whereas the East Asian monsoon affected the sediment flux to the abyssal plains of the Southwest sub-basin in the South China Sea.

构造过程和气候变化被认为是青藏高原东南边缘侵蚀的两个主要驱动因素,因此也是控制中国南海边缘沉积模式的主要因素。然而,人们对构造和气候在控制深海平原沉积类型和模式方面的作用却知之甚少。国际大洋发现计划(IODP)在南海西南次盆地深海平原的钻探结果表明,年龄大于 8 Ma 的沉积物的多痕量元素和稀土元素特征紊乱,εNd(0)和 Sr/Sr 值波动较大,这意味着南海后展布早期沉积物来源存在时间上的变化。沉积物中的高εNd(0)值和低Sr/Sr值以及丰富的新生代(13-35 Ma)锆石颗粒表明沉积物的来源相对较新,如8 Ma以前的卡加延海岭和南部的巴拉望地块。年龄小于 ∼8 Ma 的沉积物的多痕量元素和 REE 模式较为一致。沉积物的低εNd(0)值和高Sr/Sr值表明更多的大陆沉积物被搬运到深海平原。越南东南部的沿海河流以及西部的湄公河和红河在 ∼8 Ma 之后逐渐成为西南亚盆地深海沉积物的主要碎屑源。沉积物来源由南向西的转变与晚中新世时期越南中部高原和青藏高原东南缘的逐渐隆升相一致。5Ma以下夏季季风的加强不仅影响了边缘盆地,也影响了深渊盆地。我们认为,区域构造塑造并控制了产地和沉积物流向系统的变化,而东亚季风则影响了沉积物流向南海西南次盆地的深海平原。
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引用次数: 0
The Formation of Deflation Ridges 通货紧缩脊的形成
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107367

The deposition of both pumice and shell is common on beaches during calm and storm wave conditions. This paper describes an investigation of pumice and shell ridges at two sites in Australia, Dark Point in NSW, and in the Younghusband Peninsula in SE South Australia. The formation of lines of wave formed shelly and pumice rich deposits on, and above the backshore is described. The deposits are buried by dune development, but then later exhumed by aeolian deflation as deflation plains and basins evolve. Aeolian erosion of the finer sandy sediments leads to the creation of a ridge form, herein termed a deflation ridge. A new schematic model of ridge formation is also detailed whereby deflation ridges are formed by the aeolian erosion and deflation of shell or pumice concentrations and lag deposits.

浮石和贝壳沉积在平静和风暴波浪条件下的海滩上很常见。本文介绍了在澳大利亚新南威尔士州的暗角和南澳大利亚东南部的杨古斯本半岛两个地点对浮石和贝壳海脊进行的调查。本文描述了在后岸和后岸之上由海浪形成的富含壳质和浮石的沉积物。这些沉积物被沙丘的发展所掩埋,但后来随着放气平原和盆地的演变,又被风化放气所掘起。较细的沙质沉积物被风化侵蚀后形成了一种山脊形态,在此称为放气山脊。此外,还详细介绍了一种新的海脊形成示意模型,即贝壳或浮石聚集和滞留沉积物的风化侵蚀和放气形成了放气海脊。
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引用次数: 0
Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle 艾图塔基蛭石异长岩中地幔源方解石的稳定碳和氧同位素特征:对大洋地幔中有机碳循环的影响
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107363

Carbon isotope data is desired to be increased to promote the understanding of carbon cycle throughout in the Earth. Diamond is a key carbonaceous tool to study deep carbon cycle, but most diamond occurrences are limited from kimberlite pipes in the continental region. Recently, micron-sized diamonds have been discovered from the oceanic region and investigated to understand deep carbon cycle in the oceanic mantle. However, some fundamental cautions have been issued on the oceanic diamonds because some of them could be of artificial origin. Hence, alternative oceanic mantle-derived carbonaceous material is needed to increase oceanic carbon isotope data. We report micron-sized calcite vein in a lherzolite xenolith hosted by enriched mantle I (EM1)-type olivine nephelinite from Aitutaki Island, Cook Islands in the southern Pacific. With employing various techniques to determine carbon and oxygen isotope compositions from sub-micrograms of calcite, we demonstrate that carbonaceous fluid originated from EM1-type mantle source exhibited organic carbon signature based on its light carbon isotope composition along with petrographic characteristics of the calcite vein. The oceanic mantle hosts organic carbon in places due to the recycling of surface materials.

人们希望增加碳同位素数据,以促进对整个地球碳循环的了解。金刚石是研究深层碳循环的重要碳质工具,但大多数金刚石矿点仅限于大陆地区的金伯利岩管。最近,人们在大洋区域发现了微米大小的金刚石,并对其进行了研究,以了解大洋地幔中的深层碳循环。然而,人们对大洋钻石提出了一些基本的警告,因为其中一些钻石可能是人造的。因此,需要其他大洋地幔碳质材料来增加大洋碳同位素数据。我们报告了南太平洋库克群岛艾图塔基岛的富集地幔 I(EM1)型橄榄石霞石包裹的蛭石异长岩中的微米级方解石脉。通过采用各种技术测定方解石亚微粒中的碳和氧同位素组成,我们证明了源自 EM1 型地幔源的碳质流体根据其轻碳同位素组成和方解石脉的岩相特征显示出有机碳特征。由于地表物质的循环,大洋地幔在某些地方存在有机碳。
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引用次数: 0
Precipitation variation in the northern South China Sea of the last 700 years reconstructed by lagoon sediments 通过潟湖沉积物重建南海北部过去 700 年的降水变化
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107364

Precipitation changes in the East Asia are closely linked to the monsoonal climate in this region and the hydrothermal processes in the western tropical Pacific. However, trends of reconstructed precipitation records for the past millennium are inconsistent and the influencing factors are in dispute. Here we reconstruct a 700-year precipitation record for the northern South China Sea (SCS) using grain size of lagoon sediments. Our data revealed that precipitation increased in the early to middle Little Ice Age, possibly modulated by tropical cyclones and the Walker Circulation. The East Asian Summer Monsoon and Pacific Decadal Oscillation had the major influence on the precipitation changes in the northern SCS. This study provides new insight into the processes and the underlying mechanisms of climate changes in the SCS.

东亚地区的降水变化与该地区的季风气候和西热带太平洋的热液过程密切相关。然而,重建的过去千年降水记录趋势并不一致,影响因素也存在争议。在此,我们利用潟湖沉积物的粒度重建了南海北部 700 年的降水记录。我们的数据显示,降水量在小冰河时期早期到中期有所增加,可能受到热带气旋和沃克环流的影响。东亚夏季季候风和太平洋十年涛动对南中国海北部的降水变化有主要影响。这项研究为了解南中国海气候变化的过程和内在机制提供了新的视角。
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引用次数: 0
Tropical cyclone activity over the past 1200 years at the Pelican Cays, Belize 伯利兹鹈鹕湾过去 1200 年的热带气旋活动
IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2024-07-25 DOI: 10.1016/j.margeo.2024.107365

Tropical cyclone (TC) models indicate that continued planet warming will likely increase the global proportion of powerful TCs (specifically Categories 4 and 5 hurricanes), increasingly jeopardizing low-lying coastal communities and resources such as the Pelican Cays, Belize. The combination of increased coastal development and continued relative sea-level rise puts these communities at even higher risk of damage from TCs. The short TC observational record for the western Caribbean hampers the extensive study of TC activity on centennial timescales, which hinders our ability to fully understand past TC climatology and improve the accuracy of TC models. To better assess TC risk, paleotempestological studies are necessary to put future scenarios in perspective. Here, we present a high-resolution reconstruction of coarser-grained sediment deposits associated with TC (predominately ≥ Category 2 hurricanes) passages over the past 1200 years from Elbow and Lagoon Cays, two coral reef-bounded lagoons at the northern and southern end of the Pelican Cays; the most southern Belizean paleotempestological site to date. Coincident timing of historic storms with statistically significant coarser-grained deposits within cay lagoon sediment cores allows us to determine which historic TCs likely generated event layers (tempestites) archived in the sediment record. Our compilation frequency analysis indicates one active interval (above-normal TC activity) from 1740 to 1950 CE and one quiet interval (below-normal TC activity) from 850 to 1018 CE. The active and quiet intervals in the Pelican Cays composite record are anticorrelated with those from nearby and re-analyzed TC records to the north, including the Great Blue Hole (∼100 km north) and the Northeast Yucatan (∼380 km northwest). This site-specific anticorrelation in TC activity along the western Caribbean indicates that we cannot rely on any one single TC record to represent regional TC activity. However, we cannot discount that these anticorrelated periods between the western Caribbean sites are due to randomness. To confirm that the anticorrelation in TC activity among sites from the western Caribbean is indeed a function of climate change and not randomness, an integration of more records and TC model simulations over the past millennium is necessary to assess the significance of centennial-scale variability in TC activity recorded in reconstructions from the western Caribbean.

热带气旋(TC)模型显示,地球持续变暖可能会增加全球强热带气旋(特别是第 4 类和第 5 类飓风)的比例,日益危及低洼沿海社区和资源,如伯利兹的鹈鹕礁。沿海开发的增加和海平面的持续相对上升,使这些社区遭受热带气旋破坏的风险更高。加勒比海西部的热带气旋观测记录较短,妨碍了对热带气旋活动进行百年时间尺度的广泛研究,从而影响了我们全面了解过去热带气旋气候学和提高热带气旋模型准确性的能力。为了更好地评估热带气旋风险,有必要进行古气象研究,以正确看待未来的情景。在这里,我们展示了过去 1200 年来与热带气旋(主要是≥2 级飓风)相关的粗粒沉积物的高分辨率重建,这些沉积物来自鹈鹕礁南北两端的两个珊瑚礁环礁岛--埃尔博礁和泻湖礁;这是迄今为止伯利兹最南端的古气象遗址。历史上的风暴与礁湖沉积物岩心中具有统计意义的较粗粒沉积物在时间上的巧合,使我们能够确定哪些历史上的热带风暴可能产生了沉积物记录中的事件层(暴风雨岩)。我们的汇编频率分析表明,从西元 1740 年到 1950 年有一个活跃期(TC 活动高于正常水平),从西元 850 年到 1018 年有一个平静期(TC 活动低于正常水平)。鹈鹕礁综合记录中的活跃期和静止期与附近和北面重新分析过的热带气旋记录(包括大蓝洞(北面 100 千米)和尤卡坦东北部(西北面 380 千米))中的活跃期和静止期是反相关的。加勒比海西部地区热气旋活动的这种特定地点反相关性表明,我们不能依靠任何一个单一的热气旋记录来代表区域热气旋活动。然而,我们也不能排除加勒比海西部站点之间的这些反相关时期是由于随机性造成的。为了证实加勒比海西部各站点之间的热气旋活动的反相关性确实是气候变化而非随机性的结果,有必要整合过去千年的更多记录和热气旋模式模拟,以评估加勒比海西部重建记录的热气旋活动百年尺度变化的重要性。
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Marine Geology
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