Lateglacial and Holocene sedimentary dynamics in northwestern Baffin Bay as recorded in sediment cores from Cape Norton Shaw Inlet (Nunavut, Canada)
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.
(Boreas. vol. 51, n° 0300-9483, pp. 532-552, 16/10/2026)
LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, ISMER, UQAR, uOttawa
Cross‐Shore Distribution of the Wave‐Induced Circulation Over a Dissipative Beach Under Storm Wave Conditions
This study explores the spatial distribution and the driving mechanisms of the wave-induced cross-shore flow within the shoreface and surf zone of a dissipative beach. Unpublished results from a field campaign carried out in early 2021 under storm wave conditions are presented and compared with the predictions from a state-of-the-art phase-averaged three-dimensional circulation modeling system based on the vortex force formalism. Under storm wave conditions, the cross-shore flow is dominated by a strong seaward-directed current in the lower part of the water column. The largest current velocities of this return current are located in the surf zone, where the dissipation by depth-induced breaking is most intense, but offshore-directed velocities up to 0.25 m/s are observed as far as 4 km from the shoreline (≃12 m-depth). Numerical experiments further highlight the key control exerted by non-conservative wave forces and wave-enhanced mixing on the cross-shore flow across a transition zone, where depth-induced breaking, whitecapping, and bottom friction all significantly contribute to the wave energy dissipation. Under storm conditions, this transition zone extended almost 6 km offshore and the cross-shore Lagrangian circulation shows a strong seaward-directed jet in the lower part of the water column, whose intensity progressively decreases offshore. In contrast, the surf zone edge appears clearly delimited under fair weather conditions and the seaward-directed current is weakened by a near bottom shoreward-directed current associated with wave bottom streaming in the shoaling region, such that the clockwise Lagrangian overturning circulation is constrained by an additional anti-clockwise overturning cell at the surf zone edge
(Journal of Geophysical Research. Oceans. vol. 127, n° 2169-9275, pp. e2021JC018108, 16/10/2026)
LIENSs, INSU - CNRS, ULR, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
The underestimated effects of nanoplastics on living organisms
Scientific Sessions S-31 | Micro- and nanoplastics (MNPs) and human health
(Toxicology Letters. vol. 368, n° 0378-4274, pp. S72-S72, 16/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, GR, UR, INSU - CNRS, CNRS, ULaval, INSU - CNRS, CNRS
Evidence of the largest Late Holocene mountain glacier extent insouthern and southeastern Greenland during the middle Neoglacial fromBe-10 moraine dating
(Boreas. vol. 51, n° 0300-9483, pp. 61--77, 16/10/2026)
LGP, UP1, UPEC UP12, CNRS, CEREGE, IRD, AMU, CdF (institution), INSU - CNRS, CNRS, INRAE, UP1, PANGEA Research Centre, BEES, UNSW, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Passive Sampling as a Tool to Assess Atmospheric Pesticide Contamination Related to Vineyard Land Use
The massive use of pesticides in agriculture has led to widespread contamination of the environment, particularly the atmospheric compartment. Thirty-six pesticides, most used in viticul-ture, were monitored in ambient air using polyurethane foams as passive air samplers (PUF-PAS). Spatiotemporal data were collected from the samplers for 10 months (February–December 2013), using two different sampling times (1 and 2 months) at two different sites in a chateau vineyard in Gironde (France). A high-volume active air sampler was also deployed in June. Samples were extracted with dichloromethane using accelerated solvent extraction (ASE) (PUFs from both passive and active) or microwave-assisted extraction (MAE) (filters from active sampling). Extracts were analyzed by both gas and liquid chromatography coupled with tandem mass spectrometry. A total of 23 airborne pesticides were detected at least once. Concentrations in PUF exposed one month ranged from below the limits of quantification (LOQs) to 23,481 ng PUF−1. The highest concentrations were for folpet, boscalid, chlorpyrifos-methyl, and metalaxyl-m—23,481, 17,615, 3931, and 3324 ng PUF−1. Clear seasonal trends were observed for most of the pesticides detected, the highest levels (in the ng m−3 range or the µg PUF−1 range) being measured during their application period. Impregnation levels at both sites were heterogeneous, but the same pesticides were involved. Sampling rates (Rs) were also estimated using a high-volume active air sampler and varied significantly from one pesticide to another. These results provide preliminary information on the seasonality of pesticide concentrations in vineyard areas and evidence for the effectiveness of PUF-PAS to monitor pesticides in ambient air. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
(Atmosphere. vol. 13, n° 2073-4433, pp. 504, 16/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Bi-decadal changes in nutrient concentrations and ratios in marine coastal ecosystems: The case of the Arcachon bay, France
Large amounts of nutrients have been released to the coastal ecosystems during the 20th century. Since then, management policies have been implemented and these amounts decreased in the economically developed countries. We examined the bi-decadal changes in nutrients (nitrate + nitrite, ammonium, orthophosphate and silicic acid) in the Arcachon bay, a semi-enclosed lagoon that hosts one of the largest but declining seagrass meadow in Europe. Seven sites have been sampled for nutrients and biogeochemical parameters during twenty years at low and/or high tide. In addition, continental and climatic data as well as hydro-climatic indices were used. Dynamic linear models were used to assess the bi-decadal changes in nutrient concentrations and ratios, their seasonality, and the bi-decadal changes of their potential drivers. Partial least square path modeling were used to investigate the relationships between potential abiotic drivers and nutrients. During the study period, the concentration of N and Si nutrients increased whereas the concentration of orthophosphate decreased, leading to deep changes in nutrient ratios. Clear relationships between abiotic drivers (local climate, continental inputs and the bay hydrodynamism) and N, P and Si nutrients were highlighted. However, the bi-decadal change in nutrient concentrations and ratios was mainly ascribed to the seagrass meadow decline through direct (less nutrient consumption) and indirect (increase in phytoplankton biomass) processes. Changes in temperature and wind direction may also influenced the nutrients concentrations through processes of remineralisation and flushing time, respectively. This study illustrates (1) the top-down control of seagrass on the nutrients concentrations and stoichiometry, and (2) the competition between primary producers (seagrass vs phytoplankton) for their nutrients resource.
(Progress in Oceanography. vol. 201, n° 0079-6611, 16/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IFREMER
Le Projet Collectif de Recherche La Peyrouse (Saint-Félix-de-Villadeix, Dordogne), Rapport intermédiaire 2022 (2e année)
(pp. 1127, 16/10/2026)
GPR Human Past, PACEA, UB, CNRS, UBM, CNRS, UB, UBM, CNRS, UB, UBM, CNRS, CNRS, UBM, C2A, UR, MCC, UR2, CNRS, UFR HHAA, UN, TRACES, EHESS, UT2J, Comue de Toulouse, MCC, Inrap, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UBM, CNRS, UNIBO, CCJ, AMU, MCC, CNRS, LETG - Caen, LETG, UNICAEN, NU, UA, EPHE, PSL, UBO EPE, UR2, CNRS, IGARUN, UN, I2M-BX, UB, CNRS, INRAE, CReAAH, UM, UR, UR2, CNRS, UFR HHAA, UN, MC, MC, LA, EHESS, UT2J, Comue de Toulouse, UT3, Comue de Toulouse, CNRS
Progress towards an international comparison of river sediment pollution: Key factors influencing metal concentrations along seven Western European Rivers (1945-2020)
Since 60 years, a large amount of data has been acquired to survey river sediment quality, especially concerning regulatory trace metals such as Cd, Cr, Cu, Hg, Ni, Pb, and Zn. Large-scale syntheses are still rare and show some limits to assess the effectiveness of public regulations and the river systems' resilience. Based on a sediment contamination database comprising more than 12,000 samples, we propose a first attempt to decipher spatio-temporal trends of metal contamination along seven major rivers in Western Europe (Garonne-Lot, Loire, Meuse Rhine, Rhone, Scheldt and Seine Rivers). Facing heterogeneous sampling and analytical methods on different sediment matrices (bed and flood deposits – BFD, suspended particulate matter – SPM, dated sediment cores – DSC), this work investigates the effect of analytical protocols, spatial and temporal factors on metal concentration trends. At a large scale, an increase in metal concentrations (especially for Cd, Pb and Zn) is reported along most of the investigated rivers. It appears closely related to major urban-industrial hotspots (Paris-Rouen corridor on the Seine River, Bonn-Duisburg corridor on the Rhine River, etc.) and to the geology of each watershed, both influencing the regional sediment quality. Former mining and metallurgical districts, generally located in crystalline areas, also caused high metal concentrations on the long term (Upper Loire River, Middle Meuse River, Lot River). A global decrease of metal concentrations is observed in all river sections since the 1960s-1970s onwards, in response to European and national regulations, and to socio-economical changes affecting urban-industrial areas. The high influence of the location of the samples along the rivers and the decade of sampling is confirmed by a Factor Analysis of Mixed Data (FAMD). Secondary factors such as the influence of the sediment matrix type (BFD, SPM and DSC) and the different digestion procedures prior to elemental analysis also explained significant differences for Cr, Cd, Cu, Pb, or Zn, although this can also be locally balanced by the substratum (i.e. for alkaline rivers). This approach points out the limitations of the available data, particularly regarding the need of regional geological backgrounds and the more systematic acquisition of ancillary data such as grain-size and TOC. It also provides critical clues to intercompare metal sediment pollution in rivers at large spatial and temporal scales worldwide.
(16/10/2026)
EVS, ENS de Lyon, Mines Saint-Étienne MSE, IMT, UL2, UJML, INSA Lyon, INSA, UJM, UJM EPE, ENTPE, ENSAL, CNRS, ALLHiS, UJM, UJM EPE, GéHCO, UT, NEOLAiA, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, M2C, UNICAEN, NU, INSU - CNRS, UNIROUEN, NU, CNRS, LIVE, UNISTRA, CNRS, ITES, ENGEES, UNISTRA, INSU - CNRS, CNRS, LEHNA, UCBL, ENTPE, CNRS, ENTPE, ENTPE
Atmospheric Nitrous Acid Measurement in the French Landes Forest
(ACS Earth and Space Chemistry. vol. 6, n° 2472-3452, pp. 25-33, 16/10/2026)
IRCELYON-CARE, IRCELYON, UCBL, INC-CNRS, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LVEEM, UCA [2017-2020], CERI EE - IMT Nord Europe, IMT Nord Europe, IMT, IRCELYON, UCBL, INC-CNRS, CNRS
Caractérisation de la contamination métallique des sédiments dans les masses d’eau de la métropole bordelaise et analyses préliminaires de son effet sur la diversité piscicole
Dans un contexte d’une urbanisation croissante et de pressions anthropiques multiples (industrielles, domestique, agricole, trafic routier), les milieux aquatiques sont le réceptacle de grandes quantités de contaminants dont les éléments traces métalliques (ETM), historiques (e.g. Plomb [Pb], Zinc [Zn]) ou émergeants (e.g. Terres Rares REE). L’objectif général du travail s’appuie sur deux postulats : 1) La matrice sédimentaire est un bon intégrateur de la pollution engendrée à l’échelle des bassins versants dont les ETM pourraient être un bon proxy ; 2) Les poissons sont de bons indicateurs des perturbations anthropiques. Couplant deux postulats, cette étude vise à établir les relations potentielles entre la présence d’ETM dans les hydrosystèmes et la richesse et composition spécifique des peuplements de poissons dans les environnements urbains et péri-urbains de Bordeaux Métropole (Nouvelle Aquitaine, SO France). Pour cela, des pêches électriques ont été effectuées en 2018 et 2019, complétées par des prélèvements de sédiments. Une caractérisation physico-chimique des sédiments a été réalisée durant ce stage en déterminant la texture (granulométrie), les teneurs en Carbone Organique Total (COT) et en ETM sur la fraction totale (minéralisation triacide) et la fraction chimiquement disponible (digestion HCl 1M). Les concentrations brutes et normalisées (s’affranchissant de l’effet granulométrique) ont été comparées au bruit de fond géochimique régional et à des indices écotoxicologiques (TEC/PEC, Métox). Les analyses statistiques n’ont pas révélé de différence significative entre les sites, habitats et années. L’analyse préliminaire des relations entre les ETM et la composition spécifique des communautés de poissons n’a pas mis en évidence de lien statistique significatif entre les deux jeux de données. Les raisons possibles de cette absence de corrélation sont discutées, en particulier le rôle d’autres facteurs structurants négligés (e.g. physico-chimique, non intégration des ETM dissous ou de variables d’intégrité physique des cours d’eaux) et seront à investiguer pour de prochaines campagnes.
(pp. 56, 16/10/2026)
UR EABX, INRAE, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS