C. Skonieczny

C. Skonieczny
Université Paris-Saclay · Geosciences And Astrophysics

Dr.

About

29
Publications
17,103
Reads
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857
Citations
Citations since 2016
19 Research Items
770 Citations
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2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Introduction
I am an associate professor specializing in Paleoclimatology and Geochemistry. I am mainly interested in the characterization of the terrigenous fraction of sediments transferred from the continent to the ocean by aeolian and/or fluvial transport throught the Quaternary, and more particularly in climatic, environmental and anthropic information that these detrital particles may contain.
Additional affiliations
January 2017 - present
Université Paris-Sud 11
Position
  • Maitre de Conférences
January 2016 - December 2016
Massachusetts Institute of Technology
Position
  • PostDoc Position
October 2013 - December 2015
Institut Français de Recherche pour l'Exploitation de la Mer
Position
  • Fellow

Publications

Publications (29)
Article
Full-text available
Savanna ecosystems were the landscapes for human evolution and are vital to modern Sub-Saharan African food security, yet the fundamental drivers of climate and ecology in these ecosystems remain unclear. Here we generate plant-wax isotope and dust flux records to explore the mechanistic drivers of the Northwest African monsoon, and to assess ecosy...
Article
Full-text available
Mineral dust deposition characteristics are poorly constrained, even in the Northeastern Tropical Atlantic Ocean, which is immediately downwind of the Saharan desert and the largest marine repository of aeolian dust in the world. Here, we report on a 2‐year (March 2013–February 2015) time series of deposited dust on the Senegalese margin. This reco...
Article
The Mid-Pleistocene transition (MPT; 1200 to 800 thousand years, kyr) is marked by the shift from 41-kyr to 100-kyr interglacial-glacial cyclicity without substantial change in the astronomical forcing. This change in climate response relied on internal feedback processes including interaction between ice sheet/sea ice, ocean circulation and the ca...
Article
Full-text available
As the ocean is Earth’s largest reservoir of carbon, its circulation strongly influences the global carbon cycle. The neodymium (Nd) isotopic composi-tion (143Nd/144Nd or εNd) of seawater has been used as a tracer for ocean circulation. We revisit the capacity of this tracer using compiled modern seawater data sets and recent data (≤ 10,000 years,...
Article
Full-text available
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millenniums is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation Lake Bastani, on th...
Preprint
Full-text available
North Africa is the largest source of mineral dust on Earth, which has multiple impacts on the climate system; however, our understanding of decadal to centennial changes in African dust emissions over the last few millennia is limited. Here, we present a high-resolution multiproxy analysis of sediment core from high-elevation lake Bastani, in Cors...
Article
Full-text available
Rapid changes in ocean circulation and climate have been observed in marine-sediment and ice cores over the last glacial period and deglaciation, highlighting the non-linear character of the climate system and underlining the possibility of rapid climate shifts in response to anthropogenic greenhouse gas forcing. To date, these rapid changes in cli...
Cover Page
Full-text available
January 2 2019 Science Advances cover
Article
Full-text available
Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 10 ³ to 10 ⁶ years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing strong precessional variability. Here, we present the...
Article
There is increasing evidence that abrupt vegetation shifts and large-scale erosive phases occurred in Central Africa during the third millennium before present. Debate exists as to whether these events were caused by climate change and/or intensifying human activities related to the Bantu expansion. In this study, we report on a multi-proxy investi...
Data
There is increasing evidence that abrupt vegetation shifts and large-scale erosive phases occurred in Central Africa during the third millennium before present. Debate exists as to whether these events were caused by climate change and/or intensifying human activities related to the Bantu expansion. In this study, we report on a multi-proxy investi...
Article
The reconstruction of the long-term evolution of the East Asian Monsoon remains controversial. In this study, we aim to give a new outlook on this evolution by studying a 400 kyr long sediment record (U1429) from the northern East China Sea recovered during IODP Expedition 346. Neodymium isotopic ratios and rare earth element concentrations of diff...
Article
Full-text available
The rapidity and synchrony of the African Humid Period (AHP) termination at around 5.5 ka are debated, and it is unclear what caused a rapid hydroclimate response. Here we analysed the hydrogen isotopic composition of sedimentary leaf-waxes (δDwax) from the Gulf of Guinea, a proxy for regional precipitation in Cameroon and the central Sahel-Sahara....
Article
Over the past decades, rare earth elements (REE) and their radioactive isotopes have received tremendous attention in sedimentary geochemistry, as tracers for the geological history of the continental crust and provenance studies. In this study, we report on elemental concentrations and neodymium (Nd) isotopic compositions for a large number of sed...
Article
Full-text available
The Sahara experienced several humid episodes during the late Quaternary, associated with the development of vast fluvial networks and enhanced freshwater delivery to the surrounding ocean margins. In particular, marine sediment records off Western Sahara indicate deposition of river-borne material at those times, implying sustained fluvial dischar...
Article
Full-text available
Multi-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation and erosion in the Nile headwaters. Sediment eleme...
Article
A high resolution δ18O record obtained on benthic foraminifera (Cibicides wuellerstorfi) combined with clay mineralogy, major element concentrations and Sr - Nd isotopes have been investigated for the ODP Site 659 located off North Africa in order to reconstruct African monsoon intensity between 6.2 and 4.9 Myr. Mineralogical and geochemical result...
Article
a b s t r a c t Mineral dust deposits in the Northeastern Tropical Atlantic Ocean (NETAO) are an important contribution for reconstructing paleoenvironments and paleoclimates of West Africa. However, the interpretation of the changes in the sedimentological and geochemical characteristics of the dust deposits recorded in the marine sediments from t...
Article
The Northeastern Atlantic Tropical Ocean (NEATO) receives large amounts of aeolian terrigenous material transported by the trade winds from the arid and semi-arid Sahara and Sahel areas. The study of this aeolian material in the marine sedimentary records of the NEATO contributes to reconstruct past climatic and environmental changes, such as varia...
Article
A high resolution analysis of benthic foraminifera as well as of aeolian terrigenous proxies extracted from a 37 m-long marine core located off the Mauritanian margin spanning the last ~ 1.2 Ma, documents the possible link between major continental environmental changes with a shift in the isotopic signature of deep waters around 1.0–0.9 Ma, within...
Article
Dust records retrieved from ice and sediment cores represent some of our most valuable evidence for modifications of atmospheric circulation on various times scales over the last few Pleistocene glacial and interglacial climate cycles. These data also contribute to the documentation of changes in continental paleo-environments (e.g., changes in ari...
Article
The Northeastern Tropical Atlantic Ocean (NETAO) is under the influence of mineral dust plumes transported westward from the Sahara and Sahel regions. Marine sediments of the region have revealed that dust inputs to the NETAO were sensitive to global climate changes over the late Quaternary. Cold glacial periods for instance were characterized by d...
Article
Mineral dust deposits were collected at Mbour, Senegal, throughout the spring of 2006 and especially during the well-documented March 7-13 large Saharan dust outbreak. During this 7-day period, significant changes in mass flux, grain-size, clay mineralogy and Sr and Nd isotopic compositions were recorded, indicating distinct provenances for the dus...

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Projects

Project (1)
Project
The main objective of this work is to improve our knowledge of the mineralogical and geochemical composition of the Saharan dust sources, particularly those responsible for long-range transport over the Atlantic Ocean. Indeed, Mineral dust is an active component of the climate system.