Quaternary Research最新文献_第6页

Holocene millennial-scale variability of coastal environments on the southern coast of Korea and its controlling factors 朝鲜南部海岸环境的全新世千年尺度变率及其控制因素

3区地球科学

Quaternary Research Pub Date : 2023-09-11 DOI: 10.1017/qua.2023.40

Jaesoo Lim, Sangheon Yi, Youngeun Kim

{"title":"Holocene millennial-scale variability of coastal environments on the southern coast of Korea and its controlling factors","authors":"Jaesoo Lim, Sangheon Yi, Youngeun Kim","doi":"10.1017/qua.2023.40","DOIUrl":"https://doi.org/10.1017/qua.2023.40","url":null,"abstract":"Abstract Coastal evolution is influenced by past sea-level changes and resultant shifts from fluvial- to marine-dominant environments and the accompanying significant geochemical and isotopic changes in the water mass and sediments. We investigated the elemental and isotopic features of coastal sedimentary cores (27 m in length) from a small paleo-bay located on the southern coast of Korea to determine such geochemical variability and specify past changes in the bay environment and anoxic conditions and possible links to past climate changes. We analyzed total organic carbon (TOC), total sulfur (TS), their isotopes (δ 13 C TOC and δ 34 S TS ), and pyrite. The δ 13 C TOC values ranging from −25 to −19‰ (a proxy for terrestrial influence) were lower than average (−22.5‰) before 8300 cal yr BP and since 500 cal yr BP, while the intervening Early to Late Holocene showed higher δ 13 C TOC values, indicating a shallow coastal environment. The δ 34 S TS values fluctuating between −35 and +5‰ resembled sedimentation rate change. Based on the changes in the ratios of TOC to TS (C/S ratios), sedimentation rate, and δ 34 S TS , we found five possible periods with higher salinity and intensified anoxic conditions at millennial timescales: 8900–8200, 7950–6500, 5200–4300, 3500–2600, and 2000–1100 cal yr BP. These intensified anoxic conditions seem to have been influenced by increased air temperature and sea-surface temperature conditions, which could have intensified the intensity of thermal stratification (less ventilation and mixing) between surface and bottom waters and resultant anoxic conditions.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135982473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

QUA volume 115 Cover and Front matter QUA第115卷封面和封面

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-09-01 DOI: 10.1017/qua.2023.48

引用次数: 0

Introduction to Thematic Set: Aeolian Processes, Landforms and Chronologies 专题集简介：风成过程、地貌和年表

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-09-01 DOI: 10.1017/qua.2023.49

Nicholas Lancaster, Mark Sweeney

引用次数: 0

Vegetation dynamics in Dhofar, Oman, from the Late Holocene to present inferred from rock hyrax middens 从全新世晚期至今，由石岩水螅推断的阿曼佐法尔植被动态

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-08-30 DOI: 10.1017/qua.2023.42

Kaitlyn E. Horisk, S. Ivory, J. McCorriston, Molly McHale, Ali Al Mehri, A. Anderson, R. Anderson, Ali Ahmad Al Kathiri

{"title":"Vegetation dynamics in Dhofar, Oman, from the Late Holocene to present inferred from rock hyrax middens","authors":"Kaitlyn E. Horisk, S. Ivory, J. McCorriston, Molly McHale, Ali Al Mehri, A. Anderson, R. Anderson, Ali Ahmad Al Kathiri","doi":"10.1017/qua.2023.42","DOIUrl":"https://doi.org/10.1017/qua.2023.42","url":null,"abstract":"\u0000 Arid regions are especially vulnerable to climate change and land use. More than one-third of Earth's population relies on these ecosystems. Modern observations lack the temporal depth to determine vegetation responses to climate and human activity, but paleoecological and archaeological records can be used to investigate these relationships. Decreasing rainfall across the Late Holocene provides a case study for vegetation response to changing hydroclimate. Rock hyrax (Procavia capensis) middens preserve paleoenvironmental indicators in arid environments where traditional archives are unavailable. Pollen from modern middens collected in Dhofar, Oman, demonstrates the reliability of this archive. Pollen, stable isotope (δ13C, δ15N), and microcharcoal data from fossil middens reveal changes in vegetation, relative moisture, and fire from 4000 cal yr BP to the present. Trees limited to moister areas (e.g., Terminalia) today existed farther inland at ~3100 cal yr BP. After ~2900 cal yr BP, taxa with more xeric affiliations (e.g., Senegalia) had increased. Coprophilous fungal spores (Sporormiella) and grazing indicator pollen revealed an amplified signal of domesticate grazing at ~1000 cal yr BP. This indicates that trees associated with semiarid environments were maintained in the interior desert during ~3000–4000 yr of decreasing rainfall and that impacts of human activity intensified after the transition to a drier environment.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48271618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The SISAL webApp: exploring the speleothem climate and environmental archives of the world SISAL web应用程序:探索世界的洞穴气候和环境档案

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-08-30 DOI: 10.1017/qua.2023.39

I. Hatvani, Z. Kern, Péter Tanos, M. Wilhelm, F. Lechleitner, N. Kaushal

引用次数: 0

Paleoenvironmental changes in the eastern Kumtag Desert, northwestern China since the late Pleistocene 晚更新世以来中国西北库姆塔格沙漠东部的古环境变化

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-08-24 DOI: 10.1017/qua.2023.38

Hao-ze Song, Xiaoping Yang, F. Preusser, A. Fülling, Bo Chen

{"title":"Paleoenvironmental changes in the eastern Kumtag Desert, northwestern China since the late Pleistocene","authors":"Hao-ze Song, Xiaoping Yang, F. Preusser, A. Fülling, Bo Chen","doi":"10.1017/qua.2023.38","DOIUrl":"https://doi.org/10.1017/qua.2023.38","url":null,"abstract":"\u0000 Sedimentary records from the Kumtag (also known as Kumtagh) Desert (KMD) in northwestern China are investigated to better understand Late Quaternary paleoenvironmental changes in this hyper-arid region. Presented here are the results of probably the first systematic survey of sedimentary sequences from the KMD, with the chronology determined by the optically stimulated luminescence dating. The variation of sedimentary facies, supported by granular and geochemical paleoenvironmental proxies, is used to decipher the history of Late Quaternary environment changes. The results demonstrate that a constantly dry condition characterized the eastern KMD since the last glacial maximum, but with occurrences of wetter periods. From ca. 17 to 15 ka, fluvial activity was probably triggered by melting of glaciers in mountains located south of the KMD. A distinctly drier stage (ca. 13–7 ka) was recognized due to the prominent occurrence of aeolian sands. A wetter environment likely persisted between ca. 4.4 and 2.2 ka, consistent with evidence of human activities. While the causes of paleoenvironmental changes in the eastern KMD are still a matter of debate, the melting of glaciers in the Altyn-Tagh Mountains in the south must be considered as an important factor.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43179985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? 在海洋同位素第三阶段，哈德逊湾西部低地是否存在非冰川事件？

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-08-24 DOI: 10.1017/qua.2023.35

T. Hodder, M. Gauthier, M. Ross, O. Lian

{"title":"Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3?","authors":"T. Hodder, M. Gauthier, M. Ross, O. Lian","doi":"10.1017/qua.2023.35","DOIUrl":"https://doi.org/10.1017/qua.2023.35","url":null,"abstract":"\u0000 Establishing the timing of glacial and nonglacial intervals in the core regions of the Laurentide Ice Sheet (LIS) is essential to constrain ice-sheet configuration at times of globally reduced ice volume, such as during Marine Isotope Stage (MIS) 3 (~57–29 ka). Hudson Bay Lowland (HBL) deglaciation, at the centre of the LIS, has been inferred at MIS 3 based on near-infinite wood radiocarbon ages and limited luminescence ages. To better constrain the age of the penultimate deglaciation of the western HBL, this study initially identified the youngest intertill nonglacial sediments, based on extensive fieldwork and till characterization. Next, vetted radiocarbon ages were combined with revised stratigraphy to show that five previously identified “MIS 3” sites were likely deposited during an earlier ice-free period. Finally, new optical ages targeting the youngest intertill nonglacial bed at three localities yielded ages ranging from 166 to 146 ka; all older than MIS 3. These ages indicate that the penultimate deglaciation of the western HBL likely occurred during MIS 5e. This interpretation better explains accompanying paleobotanic data sets that indicate vegetation similar to vegetation existing under present interglacial conditions. Currently no firm evidence exists in the terrestrial stratigraphic record for the deglaciation of the western HBL during MIS 3.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48297573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China 从中国北方冈庚湖沉积物核心的多个指标揭示湖泊草原生态系统的变化

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-07-28 DOI: 10.1017/qua.2023.27

Liang Li, Zhi Zhang, Zhenyu Ni, Weiwei Sun, Xianqiang Meng, E. Zhang, G. Zhu, Yunlin Zhang, B. Qin

{"title":"Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China","authors":"Liang Li, Zhi Zhang, Zhenyu Ni, Weiwei Sun, Xianqiang Meng, E. Zhang, G. Zhu, Yunlin Zhang, B. Qin","doi":"10.1017/qua.2023.27","DOIUrl":"https://doi.org/10.1017/qua.2023.27","url":null,"abstract":"\u0000 As the main global terrestrial ecosystem component, grasslands are extremely sensitive to global climate change. With increasing human activities over the last century, grassland ecosystems have been degraded to different degrees. However, the evolution of lake-grassland ecosystems in recent centuries remains unclear due to the dearth of high-resolution records. Here, we present high-resolution lacustrine sediment grain size, pollen (Artemisia, Myriophyllum), Pediastrum, and n-alkane records from Ganggeng Nur Lake to investigate vegetation, lake evolution, and human effects in semiarid northern China. Four stages were identified from the last ca. 150 years: (1) the natural evolution stage (AD 1870–1945), in which there was a wet climate around Ganggeng Nur and the lake level rose from increased runoff; (2) the human disturbance stage (AD 1945–1967), in which the regional climate got drier and human activities began having a detectable effect on the grassland ecosystem; (3) the human transformation stage (AD 1967–2005), in which a completely arid climate coupled with the implementation of a series of land reclamation policies resulted in a large reduction in grassland areas, extensive soil erosion, exacerbated climate change, and shrinking lake areas; and (4) the posttreatment stage (AD 2005–2018), in which soil erosion was alleviated by policy implementation and a favorable humid climate.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47514279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A speleothem record of seasonality and moisture transport around the 8.2 ka event in Central Europe (Vacska Cave, Hungary) 中欧8.2 ka事件前后季节和水分输送的洞穴记录(匈牙利Vacska洞穴)

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-07-28 DOI: 10.1017/qua.2023.33

A. Demény, G. Czuppon, Z. Kern, I. Hatvani, Dániel Topál, Máté Karlik, G. Surányi, M. Molnár, G. Kiss, M. Szabó, Chuan‐Chou Shen, Hsun-Ming Hu, Z. May

{"title":"A speleothem record of seasonality and moisture transport around the 8.2 ka event in Central Europe (Vacska Cave, Hungary)","authors":"A. Demény, G. Czuppon, Z. Kern, I. Hatvani, Dániel Topál, Máté Karlik, G. Surányi, M. Molnár, G. Kiss, M. Szabó, Chuan‐Chou Shen, Hsun-Ming Hu, Z. May","doi":"10.1017/qua.2023.33","DOIUrl":"https://doi.org/10.1017/qua.2023.33","url":null,"abstract":"\u0000 A stalagmite was collected in northern Hungary from the Vacska Cave, where monitoring and ventilation-based site selection had been conducted. The stalagmite covers the 10–8 ka (relative to AD 1950) period, including the so-called 8.2 ka event, and showed preceding signs of climate change that were evaluated by petrographic observations, 14C activities, Sr concentrations, and stable isotope compositions of calcite and inclusion-hosted water. Comparisons of speleothem records show that isotope peaks at ca. 8.5 ka are related to a regional climate anomaly, rather than to a continental-scale event. In accordance with regional proxy records, the 8.2 ka event was associated with a series of temperature and precipitation amount changes, starting with cooling and a reduction in the winter-to-summer precipitation ratio, and then becoming a humid and warm phase at 8.15 ka. X-ray diffraction-based crystallinity parameter (FWHM) values provided evidence for diagenetic alteration of the stable oxygen isotope compositions of inclusion waters. Nevertheless, the stable hydrogen isotope compositions of inclusion waters and the oxygen isotope values of the host calcite revealed elevated d-excess values, and therefore increased Mediterranean moisture contribution during the 8.2 ka event, which indirectly indicate the southward displacement of moisture transport from the Atlantic Ocean.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44566127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Late Holocene coastal dynamics south of the Chanthaburi estuary, eastern Gulf of Thailand 泰国湾东部Chanthaburi河口以南晚全新世海岸动力学

IF 2.3 3区地球科学

Quaternary Research Pub Date : 2023-07-27 DOI: 10.1017/qua.2023.34

Armelle Ballian, S. Chawchai, Johannes M. Miocic, Warinyupa Charoenchatree, R. Bissen, F. Preusser

{"title":"Late Holocene coastal dynamics south of the Chanthaburi estuary, eastern Gulf of Thailand","authors":"Armelle Ballian, S. Chawchai, Johannes M. Miocic, Warinyupa Charoenchatree, R. Bissen, F. Preusser","doi":"10.1017/qua.2023.34","DOIUrl":"https://doi.org/10.1017/qua.2023.34","url":null,"abstract":"\u0000 Beach ridges are depositional features that allow reconstruction of past sea-level variations, sediment dynamics, and storm activity. However, there are still very few systematic studies focusing on beach ridges available from the Gulf of Thailand. Along the east coast, satellite images provide evidence of beach ridges in the Chanthaburi Province, extending as far as 6 km inland, oriented parallel to the current coastline. These can be divided into a set of landward ridges (5.3–6.0 km inland) and seaward ridges (0.4–1.8 km inland) that are separated by an arm of the Chanthaburi estuary. Optically stimulated luminescence dating of 26 sand samples from 12 pits of ridge profiles suggests that the landward set of beach ridges formed ca. 3500 yr ago, while the seaward set of ridges formed between ca. 2100–1200 years ago, which also includes the modern active beach. It appears that the landward set of beach ridges developed during a period of relatively stable sea level followed by a rapid regression presently occupied by the arm of the Chanthaburi estuary. The seaward set of beach ridges apparently reflects a millennium of slowly retreating coastline until the modern beach ridge formed.","PeriodicalId":49643,"journal":{"name":"Quaternary Research","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49170956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1