Boreas最新文献

{"title":"An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard","authors":"Daniel Hesjedal Wiberg,&nbsp;Haflidi Haflidason,&nbsp;Jan Sverre Laberg","doi":"10.1111/bor.12581","DOIUrl":"10.1111/bor.12581","url":null,"abstract":"<p>The Arctic is a climate-sensitive area, responding rapidly to present changes, but for the past changes, the record is still incomplete. For instance, the Weichselian glacial history of the Svalbard–Barents Sea Ice Sheet (SBIS) has largely been reconstructed based on studies of the fragmentary Spitsbergen terrestrial and shelf records. However, the sediments removed from the land and shelf areas during peak glacials were deposited on trough mouth fans located along the continental slope. By studying the stratigraphy and processes of the trough mouth fans, comprising a more complete sediment archive, our new data have allowed gaps in the Weichselian glacial history of the SBIS to be refined and filled. Here we present new lithological and geochronological data from the Kongsfjorden Trough Mouth Fan, closely linked to the advance and decay of the SBIS. High-resolution TOPAS seismic profiles reveal three distinct packages of glacigenic debris flows (GDFs) within its upper stratigraphy, each interpreted to represent an advance of the SBIS to the shelf edge. A radiocarbon dated, 12.6-m-long core from the southern flank of the Kongsfjorden Trough Mouth Fan penetrates trough sediments directly linked to the youngest GDF package and terminates in the second GDF, allowing us to study the last two Kongsfjorden ice-stream advances in greater detail than was previously possible. The age model of core GS10-164-09PC, based on combining ¹⁴C-, ¹⁸O-stable isotope and magnetic susceptibility data, spans the last ~54 ka. An Early Weichselian glacial advance is tentatively dated to have ended at ~90 ka. A second peak glaciation is estimated at ~70 ka, followed by a deglaciation from ~54 ka. An ice rafted debris-rich unit (U7) dated between 38 and 34 ka, followed by a plumite (U6), indicates an advance of unknown extent. The Last Glacial Maximum advance is dated to before 24 ka BP, followed by a rapid deglaciation at ~15 ka. The presence of coarser-grained sorted sediments at the present seafloor is attributed to the influence of the West-Spitsbergen Current, acting on water depths of at least 846 m, and is thought to have worked in the vicinity of the coring site since ~14 ka BP.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"667-683"},"PeriodicalIF":2.2,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12581","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46403520","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}

{"title":"Holocene history of the eastern side of Novaya Zemlya from glaciomarine sediment records in the Tsivol’ki Fjord","authors":"Valeriy Y. Rusakov,&nbsp;Tat’yana G. Kuz’mina,&nbsp;Victoria V. Krupskaya,&nbsp;Irina N. Gromyak,&nbsp;Denis N. Dogadkin,&nbsp;Tat’yana V. Romashova","doi":"10.1111/bor.12585","DOIUrl":"10.1111/bor.12585","url":null,"abstract":"<p>For the first time, the Holocene history of the Serp-i-Molot tidewater glacier at the eastern side of the Novaya Zemlya archipelago, Kara Sea, has been reconstructed based on AMS ¹⁴C dating and multiproxy analyses (lithology, mineralogy, geochemistry and microfossils) of glaciomarine sediments from the Tsivol’ki Fjord. Three main phases of the Holocene evolution of the fjord environment are identified. During the early phase, <i>c</i>. 10.6 to 4.6 cal. ka BP, the glacier front was located close to the fjord mouth. The middle phase, <i>c</i>. 4.6 to 0.9 cal. ka BP, was characterized by frontal glacier retreat and shallowing of the fjord owing to glacio-isostatic uplift of the North Island of Novaya Zemlya. The late phase, from 0.9±0.1 cal. ka BP until present, reflects the stabilization of the glacier front in the inner fjord. The absence of major Neoglacial advances of the Serp-i-Molot glacier is explained by the local climate of the Kara Sea and Novaya Zemlya, which prevents the penetration of moist air flow from the North Atlantic.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 4","pages":"859-876"},"PeriodicalIF":2.2,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12585","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42956612","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}

{"title":"Postglacial peatland vegetation succession in Store Mosse bog, south-central Sweden: An exploration of factors driving species change","authors":"Eleonor E. Ryberg,&nbsp;Minna Väliranta,&nbsp;Antonio Martinez-Cortizas,&nbsp;Johan Ehrlén,&nbsp;Jenny K. Sjöström,&nbsp;Malin E. Kylander","doi":"10.1111/bor.12580","DOIUrl":"10.1111/bor.12580","url":null,"abstract":"<p>Boreal peatlands are facing significant changes in response to a warming climate. <i>Sphagnum</i> mosses are key species in these ecosystems and contribute substantially to carbon sequestration. Understanding the factors driving vegetation changes on longer time scales is therefore of high importance, yet challenging since species changes are typically affected by a range of internal and external processes acting simultaneously within the system. This study presents a high-resolution macrofossil analysis of a peat core from Store Mosse bog (south-central Sweden), dating back to nearly 10 000 cal. a BP. The aim is to identify factors driving species changes on multidecadal to millennial timescales considering internal autogenic, internal biotic and external allogenic processes. A set of independent proxy data was used as a comparison framework to estimate changes in the bog and regional effective humidity, nutrient input and cold periods. We found that Store Mosse largely follows the expected successional pathway for a boreal peatland (i.e. lake → fen → bog). However, the system has also been affected by other interlinked factors. Of interest, we note that external nutrient input (originating from dust deposition and climate processes) has had a negative effect on <i>Sphagnum</i> while favouring vascular plants, and increased fire activity (driven by allogenic and autogenic factors) typically caused post-fire, floristic wet shifts. These effects interactively caused a floristic reversal and near disappearance of a once-established <i>Sphagnum</i> community, during which climate acted as an indirect driver. Overall, this study highlights that the factors driving vegetation change within the peatland are multiple and complex. Consideration of the role of interlinked factors on <i>Sphagnum</i> is crucial for an improved understanding of the drivers of species change on short- and long-term scales.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"651-666"},"PeriodicalIF":2.2,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12580","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45867890","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}

{"title":"The woolly rhinoceros (Coelodonta antiquitatis) from Ondorkhaan, eastern Mongolia","authors":"Naoto Handa,&nbsp;Masami Izuho,&nbsp;Keiichi Takahashi,&nbsp;Fumie Iizuka,&nbsp;Batmunkh Tsogtbaatar,&nbsp;Byambaa Gunchinsuren,&nbsp;Davakhuu Odosuren,&nbsp;Lochin Ishitseren","doi":"10.1111/bor.12582","DOIUrl":"10.1111/bor.12582","url":null,"abstract":"<p>The Mammoth Faunas, the famous cold-adapted mammal assemblages, were distributed widely across northern Eurasia and North America during the Late Pleistocene. The now extinct woolly rhinoceros, <i>Coelodonta antiquitatis</i>, was a major component. Abundant fossil remains of this species with radiocarbon dates have been reported through almost all of northern Eurasia, but the fossil rhinoceroses of Mongolia are poorly known. Here, we describe a rhinocerotid skeleton from Ondorkhaan, eastern Mongolia, and compare it with four Late Pleistocene rhinoceros species of northern Eurasia (<i>Elasmotherium sibiricum</i>, <i>Stephanorhinus hemitoechus</i>, <i>Stephanorhinus kirchbergensis</i> and <i>C. antiquitatis</i>), resulting in its identification as a woolly rhinoceros (<i>C. antiquitatis</i>). Accelerator mass spectrometry radiocarbon dates obtained from two samples (ODK01 and ODK02) of the skeleton essentially agree, 42 160–40 040 cal. a BP and 42 105–39 955 cal. a BP, and the two samples had δ¹³C values of −19.5‰ and −20.2‰ SMMKW, respectively. This find suggests that the Mammoth Faunas were distributed in eastern Mongolia <i>c</i>. 45–40 ka during the period of climatic amelioration between Heinrich events 5 (H5: 46 000 cal. a BP) and 4 (H4: 39 000 cal. a BP).</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"584-605"},"PeriodicalIF":2.2,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12582","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47030986","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}

{"title":"Vegetation response to rapid climate change during the Lateglacial–Early Holocene transition at Gola di Lago, southern Switzerland","authors":"Laura Höhn,&nbsp;Maria Leunda,&nbsp;Erika Gobet,&nbsp;Willy Tinner,&nbsp;Christoph Schwörer","doi":"10.1111/bor.12578","DOIUrl":"10.1111/bor.12578","url":null,"abstract":"<p>Predicting the effects of ongoing climate warming on vegetation requires a long-term perspective of past ecosystem dynamics. We therefore analysed the sedimentary record from the mire Gola di Lago (985 m a.s.l.) in southern Switzerland, to better understand the vegetation response to past rapid climate change. We present a high-resolution pollen and plant macrofossil study from the Lateglacial to the Early Holocene (13 400–10 400 cal. a BP), a climatic transition that represents a close analogue to current global warming. The vegetation responses during this time match previously analysed palaeoecological sites south of the Alps. At the end of the Bølling-Allerød interstadial, the site was surrounded by open larch forest. The beginning of the Younger Dryas was characterized by the local presence and rapid expansion of <i>Pinus cembra</i>, whereas the second part was dominated by <i>Pinus sylvestris</i>, <i>Betula</i> and <i>Larix decidua</i>. These vegetation dynamics agree well with independent climate data indicating a cold and dry start and a subsequent shift to slightly warmer climate. The following rapid temperature increase at the beginning of the Holocene resulted in an increase in forest density and the establishment of novel temperate vegetation assemblages, without major changes in species diversity. Noteworthy, during the Younger Dryas–Early Holocene transition, long-lived cold-adapted tree line species such as <i>P</i>. <i>cembra</i> and <i>L. decidua</i> persisted over several centuries, while open boreal forests dominated by <i>P. sylvestris</i> and <i>Betula</i> expanded, indicating high resilience to climatic changes. The results of Gola di Lago suggest that climate warming led to a significant change in vegetation communities through species range shifts. Our study also indicates that some species may potentially be able to locally persist under current global warming, forming novel vegetation assemblages with newly establishing species.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"606-620"},"PeriodicalIF":2.2,"publicationDate":"2022-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48067556","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}

{"title":"The first fossil record of a bone assemblage accumulated by New World vultures (Gruta do Presépio, Holocene, southern Brazil)","authors":"Fernando Ballejo,&nbsp;Patrícia Hadler,&nbsp;Jorge J. Cherem,&nbsp;Lucas Bueno,&nbsp;Juliana S. Machado,&nbsp;Alejandra B. Matarrese,&nbsp;Fernando J. Fernández","doi":"10.1111/bor.12579","DOIUrl":"10.1111/bor.12579","url":null,"abstract":"<p>Here we present the first fossil record of a bone assemblage that could have been accumulated by New World vultures (Cathartidae). The bone remains were found in an archaeological rockshelter called Gruta do Presépio (GPR), located in the tropical rainforest environment of Santa Catarina State, southern Brazil, where groups of hunters and gatherers lived from the Early to Middle Holocene (9.3–4.6 cal. ka BP) until the Late Holocene (1.3 cal. ka BP). The results of taphonomic analysis of the archaeological sample are compared with actualistic taphonomic modifications produced by New World vultures. The findings of autopodials (mainly phalanges) of medium and large mammals, with a high degree of digestive corrosion but without tooth marks, could be related to the pellet deposit pattern of New World vultures. Seven mammal taxa associated with a forest environment were identified, four of which were obtained from pellets deposited by Cathartidae; these included some native taxa (Cervidae, Dasypodidae, Felidae and Tayassuidae) that are frequently consumed today by these scavenger birds. The bone and tooth remains contained in the pellets regurgitated by Cathartidae were found together with faunal remains discarded by humans that lived in GPR from the Early to the Late Holocene. This palimpsest highlights the relevance of archaeological and actualistic taphonomic studies.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"684-697"},"PeriodicalIF":2.2,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12579","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44640128","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}

{"title":"GlaciDat – a GIS database of submarine glacial landforms and sediments in the Arctic","authors":"Katharina T. Streuff,&nbsp;Colm Ó Cofaigh,&nbsp;Paul Wintersteller","doi":"10.1111/bor.12577","DOIUrl":"10.1111/bor.12577","url":null,"abstract":"<p>A digital database for submarine glacial landforms and sediments formed in the Arctic during and since the Last Glacial Maximum was created in order to facilitate and underpin new research on palaeo-ice sheets and tidewater glacier dynamics. The glacimarine database (GlaciDat) documents and standardises evidence of previous glacial activity as visible on the contemporary seafloor of fjords and continental shelves around Svalbard, Greenland, Alaska, northern Russia and north of 66°30′N in Canada and Norway. An extensive literature search was conducted to create GlaciDat, which compiles nearly 60 000 individual submarine landforms, more than 1000 sediment cores and 232 radiocarbon dates. Glacial landforms included are cross-shelf troughs, trough-mouth fans, grounding-zone wedges, lateral moraines, overridden moraines, (mega-scale) glacial lineations, drumlins, crag-and-tails, medial moraines, terminal moraines, debris-flow lobes (including glacier-contact fans), recessional moraines, De Geer moraines, crevasse-fill ridges, eskers, hill-hole pairs, crescentic scours, and submarine channels. They were digitised as point, line and polygon features alongside a list of their individual characteristics. Sediment core locations are attributed with a description of the sampled lithofacies and sedimentation rates where available. Landforms and sediments have been standardised according to predefined nomenclatures to make the glacial evidence as consistent as possible. Marine radiocarbon dates were included when thought to be relevant for constraining the timing of large-scale palaeo-ice dynamics. Outlines of bathymetric data sets, which have previously been used for glacial geomorphological mapping, were also included to give an overview of already investigated research areas. GlaciDat is available for download (https://doi.pangaea.de/10.1594/PANGAEA.937782) and will aid researchers in the reconstruction of past ice dynamics and the interpretation of Arctic glacial landform–sediment assemblages. Moreover, as well as providing a comprehensive bibliography on Arctic glacial geomorphological and sedimentological research, it is intended to serve as a basis for future modelling of Arctic glacier and ice-sheet dynamics.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"517-531"},"PeriodicalIF":2.2,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12577","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43115451","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}

{"title":"Faecal biomarkers as tools to reconstruct land-use history in maar sediments in the Westeifel Volcanic Field, Germany","authors":"Jago J. Birk,&nbsp;Kristina Reetz,&nbsp;Frank Sirocko,&nbsp;David K. Wright,&nbsp;Sabine Fiedler","doi":"10.1111/bor.12576","DOIUrl":"10.1111/bor.12576","url":null,"abstract":"<p>The analysis of faecal biomarkers in lake sediments has been used to reconstruct human population densities and animal husbandry practices in an increasing number of studies in recent years. However, terrigenous biomarkers can decompose in soils, can be stored and redeposited in colluvium and on flood-plains prior to their ultimate deposition in lakes. These and other effects can blur and distort biomarker signals. Therefore, we analysed sediments from two maars in Westeifel to evaluate whether signals of the faecal biomarkers (5β-stanols, bile acids) demonstrate statistically significant differences between contrasting periods in land-use intensity. In Holzmaar, palaeoenvironmental data showed evidence for agriculture including cereal cultivation and grassland during the pre-Roman Iron Age and Middle Ages compared with those from periods that were less influenced by land use and showed a higher abundance of broadleaf forest. However, the specific domesticated taxa of livestock in the locale from these periods remain speculative. We found statistically significantly different faecal biomarker signals, which we interpret to be related to an enhanced deposition of faeces of horses, pigs and ruminants in the core sections that represented periods of amplified land use. The analyses of grass- and broadleaf-tree characteristic <i>n</i>-alkanes supported the applicability of biomarkers for land-use reconstruction. Stanol data from a core section dating to the Mesolithic showed no clear results. Analyses of two core sections from Ulmener Maar, which covered periods before and after the decline of elm in the Neolithic, indicated input of pig faeces in the younger section. This study provides important evidence that faecal biomarkers can be used for land-use reconstruction in central European lakes with small catchment areas for time periods from the Neolithic onwards. The results underscore the importance of bile acid analyses in addition to stanol analyses for an identification of faeces inputs from different animals.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"637-650"},"PeriodicalIF":2.2,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12576","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42142208","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}

{"title":"Lateglacial and Holocene sedimentary dynamics in northwestern Baffin Bay as recorded in sediment cores from Cape Norton Shaw Inlet (Nunavut, Canada)","authors":"Nathan Stevenard,&nbsp;Jean-Carlos Montero-Serrano,&nbsp;Frédérique Eynaud,&nbsp;Guillaume St-Onge,&nbsp;Sébastien Zaragosi,&nbsp;Luke Copland","doi":"10.1111/bor.12575","DOIUrl":"10.1111/bor.12575","url":null,"abstract":"<p>The physical, sedimentological, mineralogical and elemental geochemical properties of sediment cores AMD1803-02BC and 01PC from the Cape Norton Shaw Inlet were investigated to reconstruct glacial sediment discharges from southeastern Manson Icefield and document the impact of ice–ocean interactions on the sediment dynamics and opening of the North Water Polynya (NOW) in northwestern Baffin Bay since the last deglaciation. Laminated glaciomarine sediments rich in quartz and feldspar are observed prior to 11 cal. ka BP and were probably deposited by hyperpycnal currents triggered by the local retreat of the southern margin of the Innuitian Ice. Detrital proxies suggest that Early Holocene sediment dynamics were mainly influenced by sea ice and iceberg rafting and meltwater discharges related to the deglaciation of eastern Smith (~11 to 10.65 cal. ka BP) and Jones (~10.7 cal. ka BP) sounds. This also provides an upper limit to the timing of formation of the NOW. The high detrital carbonate contents during 8.8 to 6.6 cal. ka BP confirm that enhanced carbonate-rich sediment export from Nares Strait to northern Baffin Bay occurred during and after the deglaciation of Kennedy Channel (8.8 to 8.2 cal. ka BP). Canadian Shield sediment inputs have dominated since 6.6 cal. ka BP, indicating that sedimentation is mainly influenced by Cape Norton Shaw glacier discharges. The lower level of sedimentation recorded in core 01PC during the Middle to Late Holocene suggests an accelerated landward retreat of the Cape Norton Shaw glaciers in response to warmer marine conditions. During the Neoglacial period, higher sedimentation rates and detrital proxies in the cores suggest increased glacial erosional processes, probably associated with the long-term declines in boreal summer insolation and glacier growth. Finally, mineralogical and grain-size data in core 02BC support the idea that increased Arctic atmospheric temperatures have had an important influence on the glacial dynamics during the industrial period.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"532-552"},"PeriodicalIF":2.2,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12575","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43752510","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}

{"title":"Past millennium hydroclimate variability from Corsican pine tree-ring chronologies","authors":"Jan Esper,&nbsp;Claudia Hartl,&nbsp;Oliver Konter,&nbsp;Frederick Reinig,&nbsp;Philipp Römer,&nbsp;Frédéric Huneau,&nbsp;Sebastien Lebre,&nbsp;Sonja Szymczak,&nbsp;Achim Bräuning,&nbsp;Ulf Büntgen","doi":"10.1111/bor.12574","DOIUrl":"10.1111/bor.12574","url":null,"abstract":"<p>Palaeoclimatic evidence is necessary to place the current warming and drying trends of the Mediterranean region in a long-term perspective of pre-industrial variability. Annually resolved and absolutely dated climate proxies that extend back into medieval times are, however, limited to a few sites only. Here we present a network of long ring width chronologies from <i>Pinus nigra</i> tree-line sites in northern Corsica (France) that cohere exceptionally well over centuries and support the development of a single high-elevation pine chronology extending back to 974 CE. We apply various detrending methods to these data to retain high-to-low frequency ring width variability and scale the resulting chronologies against instrumental precipitation and drought observations to produce hydroclimate reconstructions for the last millennium. Proxy calibration and transfer are challenged by a lack of high-elevation meteorological data, however, limiting our understanding of precipitation changes in sub-alpine tree-line environments. Our new reconstructions extend beyond existing records and provide evidence for low-frequency precipitation variability in the central-western Mediterranean from 974–2016 CE. Comparison with a European scale drought reconstruction network shows that regional predictor chronologies are needed to accurately estimate long-term hydroclimate variability on Corsica.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"51 3","pages":"621-636"},"PeriodicalIF":2.2,"publicationDate":"2021-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.12574","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42271585","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}