Journal of Quaternary Science最新文献_第2页

Multi-proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-12-09 DOI: 10.1002/jqs.3682

Marianne F. S. Vogel, Sébastien Joannin, Mebarek Lamara, Hugo Asselin, Adam A. Ali, Sabrina Leclercq, Cécile Latapy, Franck Richard, Yves Bergeron

{"title":"Multi-proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)","authors":"Marianne F. S. Vogel, Sébastien Joannin, Mebarek Lamara, Hugo Asselin, Adam A. Ali, Sabrina Leclercq, Cécile Latapy, Franck Richard, Yves Bergeron","doi":"10.1002/jqs.3682","DOIUrl":"https://doi.org/10.1002/jqs.3682","url":null,"abstract":"Following deglaciation, lowland sites in eastern Canada that were covered by proglacial Lake Ojibway recorded direct afforestation with boreal mixedwood taxa, without an initial tundra phase, contrary to sites that were never covered by this lake. Because former islands of proglacial Lake Ojibway were colonized by vegetation before lake drainage around 8200 cal a bp, we hypothesized that these paleo-islands went through a non-arboreal phase which eventually transitioned to boreal mixedwoods, hence providing a source of propagules for rapid and later colonization of the lowlands. We carried out a multi-proxy analysis combining pollen, macro-remains, sedimentary ancient DNA and charcoal to document vegetation composition and dynamics on two paleo-islands. Both study sites recorded progressive vegetation establishment starting with a tundra-like phase with only herbs and shrubs, followed by open forests dominated by either larch or pine, culminating with the establishment of the boreal mixedwoods about 300 years before the final drainage of proglacial Lake Ojibway. Fire regimes seem to have partially driven vegetation dynamics and diversity on the paleo-islands. Paleo-islands were sources of propagules, which helps explain how the former Lake Ojibway lowlands were directly colonized by boreal mixedwoods, without an initial tundra phase.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 2","pages":"229-242"},"PeriodicalIF":1.9,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3682","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370093","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

Insights into human–environment interactions in tropical Africa during the Late Holocene based on the sediment sequence from Saiwa Swamp, Kenya

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-12-04 DOI: 10.1002/jqs.3673

Lawrence Morara Kiage

{"title":"Insights into human–environment interactions in tropical Africa during the Late Holocene based on the sediment sequence from Saiwa Swamp, Kenya","authors":"Lawrence Morara Kiage","doi":"10.1002/jqs.3673","DOIUrl":"https://doi.org/10.1002/jqs.3673","url":null,"abstract":"<div>\u0000 \u0000 The present landscapes that define the tropical African region have evolved through the intricate interplay of climate and human interventions across various spatial and temporal scales. The late Holocene period is a valuable window for investigating how the environment responded to human influence. This study examined paleoenvironmental changes in the African tropics over the past 3500 years using proxy data, encompassing pollen, fungal spores, loss-on-ignition and microscopic charcoal extracted from core SS4 collected from Saiwa Swamp in western Kenya. The results show that Afromontane forests, represented by Podocarpus, Olea, Celtis and Juniperus, persisted in the region for much of the late Holocene despite prevailing conditions that favored the expansion of open savanna-like vegetation and drought-adapted taxa. The charcoal record reveals continuous fire occurrences throughout the sequence, raising questions about human-induced fires and their potential role in shaping the landscape. The emergence of Sordaria fungal spores in the record between approximately 925 \u0000bce and 970 \u0000ce points to early human settlements engaging in livestock farming. Yet, these initial anthropogenic impacts did not trigger extensive forest clearing, hinting at a nuanced interplay between human activities and the environment during that era. The study emphasizes the importance of considering natural and human factors when interpreting environmental changes. It highlights the complex interplay of climatic, ecological and anthropogenic factors in shaping the landscape and vegetation dynamics over time.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 2","pages":"319-331"},"PeriodicalIF":1.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370057","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

Sub-centennial upper water column structure variability of the tropical Indian Ocean since the Last Glacial Maximum

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-12-04 DOI: 10.1002/jqs.3680

Soni Rai, D. P. Singh, R. Saraswat, A. S. Maurya

{"title":"Sub-centennial upper water column structure variability of the tropical Indian Ocean since the Last Glacial Maximum","authors":"Soni Rai, D. P. Singh, R. Saraswat, A. S. Maurya","doi":"10.1002/jqs.3680","DOIUrl":"https://doi.org/10.1002/jqs.3680","url":null,"abstract":"<div>\u0000 \u0000 The upper water column (UWC) is involved in the worldwide distribution of heat and nutrients. However, global warming is expected to alter the UWC structure due to temperature- and precipitation-induced stratification. This impact of global warming is comparatively more pronounced in the Indian Ocean. Therefore, to understand the fate of the UWC structure in the future, it is important to comprehend its past variability in the Indian Ocean. To achieve this, we have reconstructed sub-centennial scale variations in the UWC structure of the tropical central Indian Ocean by using the isotopic composition (δ18O and δ13C) of surface-dwelling planktic foraminifera Globigerinoides ruber and subsurface-dwelling Neogloboquadrina dutertrei. The difference in the isotopic composition of the surface- and subsurface-dwelling species (Δδ18Or-d and Δδ13Cr-d) was used to understand the UWC structure variability in the tropical central Indian Ocean. We report a deeper mixed layer and thermocline during the last glacial period, followed by a shoaling of the thermocline during the glacial–interglacial transition. The thermocline also deepened during intense boreal summer monsoon events such as in the Bølling–Allerød and early Holocene. Our findings suggest that the tropical Indian Ocean UWC is influenced primarily by the intensity of the monsoon winds. From the comparison of our record with those of the eastern and western Indian Ocean, it is evident that a similar climatic forcing governed the central and eastern regions during the last glacial–interglacial period.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 2","pages":"257-266"},"PeriodicalIF":1.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370061","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

Charcoal morphotypes as indicators of fire fuel types and fire events along eight centuries in east-central Mexico

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-12-02 DOI: 10.1002/jqs.3675

Esperanza Torres-Rodríguez, Blanca L. Figueroa-Rangel, Margarita Caballero, Daisy Valera-Fernández, Daniela López-Méndez, Socorro Lozano-García

{"title":"Charcoal morphotypes as indicators of fire fuel types and fire events along eight centuries in east-central Mexico","authors":"Esperanza Torres-Rodríguez, Blanca L. Figueroa-Rangel, Margarita Caballero, Daisy Valera-Fernández, Daniela López-Méndez, Socorro Lozano-García","doi":"10.1002/jqs.3675","DOIUrl":"https://doi.org/10.1002/jqs.3675","url":null,"abstract":"<div>\u0000 \u0000 The study of fire and charcoal production in tropical mesophytic ecosystems provides valuable insights into the ecological and climatic history of these systems. The diverse vegetation produces charcoal in various forms and sizes, which influences its dispersion and provides key information about fire dynamics. In this study, we used an approximately 850-year sedimentary charcoal record extracted from Lake Atezca in east-central Mexico to reconstruct the history of fire activity, including frequency and intensity. We present innovative information on charcoal morphotypes to interpret fire regimes, identify the types of vegetation burned and analyze human impact. The results reveal a shift in fire regimes during the Spanish Conquest, transitioning from local-scale burning associated with intensive wood burning for indigenous agriculture to regional-scale burning characterized by the burning of herbs and grasses linked to the expansion of extensive livestock grazing. This transition is reflected in the decrease of wood charcoal and the increase of smaller particles, as well as in the rise in titanium in the sediments, indicating greater landscape alteration. The evolution of fire regimes in Lake Atezca was driven primarily by human activities since pre-Hispanic times, although climatic factors, such as severe droughts, may have also influenced fire activity.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 2","pages":"303-318"},"PeriodicalIF":1.9,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370056","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 first radiocarbon and stable isotope data for megafauna remains in Kaliningrad Province, Russia

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-25 DOI: 10.1002/jqs.3674

Yaroslav V. Kuzmin, Nikolai V. Martynovich, Johannes van der Plicht

引用次数: 0

The Paleo-Serchio River: history of floods between Lucca and Pisa during the Roman period

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-25 DOI: 10.1002/jqs.3668

Monica Bini, Alberto Caroti, Federico Cantini, Fabio Fabiani, Marco Fiorentini, Antonio Fornaciari, Ilaria Isola, Marco Lazzarotti, Marco Luppichini, Scott Mensing, Jordan Palli, Gianluca Piovesan, Giovanni Zanchetta

{"title":"The Paleo-Serchio River: history of floods between Lucca and Pisa during the Roman period","authors":"Monica Bini, Alberto Caroti, Federico Cantini, Fabio Fabiani, Marco Fiorentini, Antonio Fornaciari, Ilaria Isola, Marco Lazzarotti, Marco Luppichini, Scott Mensing, Jordan Palli, Gianluca Piovesan, Giovanni Zanchetta","doi":"10.1002/jqs.3668","DOIUrl":"https://doi.org/10.1002/jqs.3668","url":null,"abstract":"The reconstruction of flood frequency beyond the Instrumental Era is challenging and mostly based on historical sources, but it rarely covers more than the last 1000 years when abundant documentation is preserved. To investigate the long-term trends in flooding and obtain insight into current climatic changes it is necessary to extend these data to a larger number of rivers beyond the Instrumental Era and available period of historical documentation. In this paper we reconstruct the paleoflood record for the Roman Period of the Serchio River (Auser in antiquity, located in Northern Tuscany, Central Italy) using geoarcheological data. The complex hydrological evolution of the river and the development of the important cities of Lucca and Pisa on the river bank allowed an important collection of data, showing a prominent peak in flood activity during the 1st century \u0000ce, which seems to correspond to an increase in regional rainfall interpreted from speleothem proxies. A secondary peak is present in the 6th century \u0000ce, which corresponds locally with an increase in precipitation recorded by speleothems. The phases of increased flooding, when compared with present-day synoptical meteorological conditions, probably developed during a period of negative North Atlantic Oscillation (NAO) Index, and it is partially supported by comparison with paleoproxies for NAO. These findings confirm that an extensive collection of geoarcheological data, supported by geological and geomorphological investigation, represents a powerful tool to be integrated with historical data for the reconstruction of floods. The concomitance of local paleohydrological proxies can help in disentangling the origin of the signal from other causes.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 1","pages":"141-152"},"PeriodicalIF":1.9,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3668","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119415","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

A multimethod analysis for tracing Gravettian red ochre provenance at Arene Candide Cave (NW Italy)

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-14 DOI: 10.1002/jqs.3670

I. Rellini, G. Martino, R. Cabella, E. Sessa, R. Maggi, J. Riel-Salvatore

{"title":"A multimethod analysis for tracing Gravettian red ochre provenance at Arene Candide Cave (NW Italy)","authors":"I. Rellini, G. Martino, R. Cabella, E. Sessa, R. Maggi, J. Riel-Salvatore","doi":"10.1002/jqs.3670","DOIUrl":"https://doi.org/10.1002/jqs.3670","url":null,"abstract":"Arene Candide Cave, a key site for Western Mediterranean prehistory, is famous for the discovery of the richly adorned Mid–Upper Palaeolithic burial of the ‘Young Prince’ and for its use as a burial site at the end of the Pleistocene (Late Epigravettian). In both contexts, red ochre was a conspicuous element of the burial practices. Unfortunately, few provenance studies and analytical data are available for the pigments recovered in the cave. Likewise, the geographical and geological origins of these colouring materials, which are naturally abundant in the Liguro-Provençal Arc, have received little to no attention despite their technical and symbolic value. During the 2008–2013 archaeological excavation at Arene Candide Cave, micromorphological samples were collected from the Upper Palaeolithic portion of the 1940s stratigraphic profiles, permitting a first description of site formation processes during the Gravettian. This led to the recognition of a Late Gravettian layer characterized by poorly sorted sediment rich in very small ochre fragments. This study establishes the provenance of these ochre fragments through the combined use of optical microscopy, scanning electron microscopy and X-ray diffraction. The results reveal a strong correspondence between the Arene Candide ochres and local ore sites, which were never considered before as potential sources. The mineralogical composition of the samples, characterized by the presence of barium sulphate and iron oxides, indicates that the Finalese area (NW Liguria) in which the site is located was the most likely source of the colouring pigments used by the Upper Palaeolithic hunter-gatherers of the Arene Candide Cave.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 1","pages":"36-52"},"PeriodicalIF":1.9,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3670","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115235","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

Evidence for the oldest Middle Palaeolithic cave occupation in the Romanian Carpathians

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-14 DOI: 10.1002/jqs.3667

Christoph Schmidt, Daniel Veres, George Murătoreanu, Marian Cosac, Loredana Niţă, Ştefan Vasile, Gabriel Sebastian Şerbănescu, Iuliana-Elisabeta Bartok

{"title":"Evidence for the oldest Middle Palaeolithic cave occupation in the Romanian Carpathians","authors":"Christoph Schmidt, Daniel Veres, George Murătoreanu, Marian Cosac, Loredana Niţă, Ştefan Vasile, Gabriel Sebastian Şerbănescu, Iuliana-Elisabeta Bartok","doi":"10.1002/jqs.3667","DOIUrl":"https://doi.org/10.1002/jqs.3667","url":null,"abstract":"The Middle and Upper Palaeolithic sites in the Carpathians and Danube lowlands constitute key contexts for tracing the dispersal of Homo sapiens into central-western Europe and the replacement of Homo neanderthalensis. Surprisingly, the Romanian archaeological inventory lacks transitional technologies and only a few sites have been systematically excavated and numerically dated, explaining the incomplete understanding of the Middle Palaeolithic and hence Neanderthal population dynamics. Here we present new age constraints for the Abri 122/1200 and Peștera Mare caves in the Romanian Carpathians, obtained by radiocarbon dating of charcoal and bone and by optically stimulated luminescence (OSL) dating of cave sediments. Methodological issues and the method's upper limit cause grossly underestimated radiocarbon ages for charcoal from Abri 122/1200 and provide only minimum ages (>41–60 14C ka \u0000bp) for bones from Peștera Mare cave. However, the OSL ages suggest Middle Palaeolithic cave occupation in the Carpathians since early Marine Isotopic Stage (MIS) 7 and lasting at least until MIS 5. These ages reinforce the vast potential of Carpathian cave sites in solidifying our understanding of Neanderthal dynamics in the region and their habitats. We discuss the reliability of this new chronology and the archaeological implications for the Middle Palaeolithic of neighbouring areas.","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 1","pages":"22-35"},"PeriodicalIF":1.9,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jqs.3667","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115262","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

A 15 000 cal a paleoclimatic record from Laguna del Viento (33°S), Subtropical Andes, central Chile

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-13 DOI: 10.1002/jqs.3662

Diego Rodríguez-Contreras, Antonio Maldonado, Valentina Flores-Aqueveque, Tania Villaseñor, María Eugenia de Porras, Praxedes Muñoz

{"title":"A 15 000 cal a paleoclimatic record from Laguna del Viento (33°S), Subtropical Andes, central Chile","authors":"Diego Rodríguez-Contreras, Antonio Maldonado, Valentina Flores-Aqueveque, Tania Villaseñor, María Eugenia de Porras, Praxedes Muñoz","doi":"10.1002/jqs.3662","DOIUrl":"https://doi.org/10.1002/jqs.3662","url":null,"abstract":"<div>\u0000 \u0000 Subtropical zones are crucial for understanding climate dynamics, as they strongly control the subtropical anticyclone system and serve as a bridge between the tropical and temperate regions of the planet. Therefore, understanding the long-term dynamics of these areas is vital on a hemispheric scale. A continuous late Pleistocene climate record based on sedimentological proxies was reconstructed using a lacustrine core from the Chilean Subtropical Andes (~33°S). Since the late Pleistocene, high lake levels subjected to cold and wet conditions prevailed between ~15.4 and 14k cal a bp, followed by glacier retreat between 14 and 13.7k cal a \u0000bp. The Pleistocene–Holocene transition is marked by increasing sedimentological parameter values and organic matter content, recording a significant shift in the environmental conditions. Decreased lake levels and high-energy events predominated until ~8.5k cal a \u0000bp, followed by warm and arid conditions with high-energy/runoff events from 8.5 to 5.2k cal a \u0000bp, with the driest period occurring ~6.4k cal a \u0000bp. Turbiditic flows appear between 5.2 and 2.6k cal a \u0000bp, and cold conditions between 2.6 and 2.3k cal a \u0000bp. From 1720 to 960 cal a \u0000bp, cold and wet conditions predominated. Warm and wet conditions prevailed to the present, with a brief return to cold and dry conditions at 720 cal a \u0000bp. Important widely represented events such as the Last Glacial termination, early to mid-Holocene Transition and Little Ice Age are present in the core record.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 1","pages":"106-123"},"PeriodicalIF":1.9,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114543","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 47.0-kyr record of mercury deposition in lake sediments from Dahu swamp in the East Nanling Mountains, southern China: Implications for paleoclimatic and environmental changes

IF 1.9 3区地球科学

Journal of Quaternary Science Pub Date : 2024-11-13 DOI: 10.1002/jqs.3669

Tianhang Li, Wei Zhong, Mingying Quan, Xiaojun Wang, Jian Yu

{"title":"A 47.0-kyr record of mercury deposition in lake sediments from Dahu swamp in the East Nanling Mountains, southern China: Implications for paleoclimatic and environmental changes","authors":"Tianhang Li, Wei Zhong, Mingying Quan, Xiaojun Wang, Jian Yu","doi":"10.1002/jqs.3669","DOIUrl":"https://doi.org/10.1002/jqs.3669","url":null,"abstract":"<div>\u0000 \u0000 In this study, we provide an ~47.0-kyr mercury (Hg) deposition record derived from a lacustrine sedimentary sequence in Dahu swamp in the eastern Nanling Mountains, China. The results indicate that organic matter (OM) input played a role in Hg accumulation, whereas the contribution of inorganic weathering detritus had a negligible impact. On the other hand, evolution of the plant community and wildfire events were also important factors affecting Hg accumulation. Compared to arboreal plants, lower (herbs and ferns) plants had stronger absorption and enrichment ability for Hg thus favoring enhanced Hg accumulation in the sediments. We therefore infer that Hg deposition in Dahu sediments was greatly controlled by changes in climatic conditions. Relatively dry and cold climatic conditions, which resulted in reduced arboreal plant communities and increased lower plants, would favor an increased Hg accumulation rate; furthermore, dry conditions may cause more wildfire events thus leading to enhanced release of Hg into the environment and increased contribution of Hg to the sediments, whereas relatively wet and warm conditions would result in the opposite situation. The record of Hg deposition demonstrates a synchronous orbital-scale variation trend with the intensity of the East Asian summer monsoon. Period analysis reveals several millennial- and centennial-scale cycles similar to solar insolation, together with several millennial events of increased Hg concentration and accumulation rate, which coincided with the corresponding Heinrich events, suggesting joint impacts of solar irradiation and the action of melting water as well as changes in zonal atmospheric circulation on Hg accumulation in Dahu sediments.\u0000 </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":"40 1","pages":"9-21"},"PeriodicalIF":1.9,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114552","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