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Publications (44)
The regulation of seal and whale hunting in Kalaallit Nunaat (Greenland) belongs to the Naalakkersuisut (National Government), which is notably informed by the work of the Scientific Committee (SC) of the North Atlantic Marine Mammal Commission (NAMMCO). Since 2004, quotas were set in Kalaallit Nunaat to regulate hunting practices and promote ecolo...
The regulation of seal and whale hunting in Kalaallit Nunaat (Greenland) belongs to the Naalakkersuisut (National Government), which is notably informed by the work of the Scientific Committee (SC) of the North Atlantic Marine Mammal Commission (NAMMCO). Since 2004, quotas were set in Kalaallit Nunaat to regulate hunting practices and promote ecolo...
Concepts like knowledge co-production and narrative-centred approaches have become more prominent in place-based research in the Arctic. This article will share article is primarily about our research in Greenland. We investigated the interactions between the local narratives of resilience and two broad categories of external narratives: environmen...
For many small communities in the Arctic, climate change-driven variations inthe sea-ice thickness and extent are a central experience of recent environmentaltransformations. In Ittoqqortoormiit (Box 1), Kalaallit Nunaat (Greenland), sea iceis a ‘character’ that featured in many stories we were told. Discrepancies and mis-matches between sea ice co...
Since 2021, a French research team has been visiting Ittoqqortoormiit as part of a research project to understand what it means to live here in Ittoqqortoormiit. Many of the stories told highlighted the importance of the narwhal. The year 2021, when only two narwhals were caught, came up again and again. As did the introduction of quotas since 2004...
Rescaling and re-grounding environmental upheavals and climate change's narratives into meaningful and salient place-based experiences of the world (s) is both urgent and crucial. There are robust evidences that the entangled crisis (that is not limited to climate) is threatening with higher intensity certain ways-of-being in the world, which are a...
Cet ouvrage, aux nombreuses illustrations, donne une vision transversale des changements environnementaux d'échelle mondiale que connaît notre planète aux limites finies. Son objectif est, en particulier, de faire comprendre les mécanismes et conséquences du réchauffement climatique et de l'érosion de la biodiversité ainsi que leurs relations avec...
En 2017 et 2019 ont eu lieu les deux premières éditions de l'école d'été « Autour du 2°C » consacrée aux enjeux de l'interdisciplinarité de la recherche et des parcours de formation sur le changement climatique. Nous revenons dans ce texte sur les motivations qui ont conduit au lancement de cette initiative, ainsi que sur le positionnement et le dé...
The study investigates factors that directly or indirectly affect the development of settlements in the North-East of the Russian Arctic. The study highlights the specific features of the Arctic settlements of the Northeast, as well as factors that will be considered in the development of a methodology for assessing the resilience of Arctic communi...
From May 2014 to September 2018, a laser spectrometer analyzer provided a 4.5 years continuous record of water vapor isotopic composition at Ny‐Ålesund (8 m above sea level, a.s.l.), Svalbard. It corresponds to the longest data set published in polar regions. A comparison of this data set with a parallel similar data set obtained during 20 days by...
We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the Heinrich stadial 2 and three Greenland interstadials of the 20-50 ka period based on the comparison of new and published sedimentary ²³¹Pa/²³⁰Th data with simulated sedimentary ²³¹Pa/²³⁰Th. We show that the deep Atlantic circulation during these i...
We reconstruct the geometry and strength of the Atlantic Meridional Overturning Circulation during Heinrich Stadial 2 and three Greenland interstadials of the 20–50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these inter...
We reconstruct the geometry and strength of the Atlantic Meridional Overturning Circulation during Heinrich Stadial 2 and three Greenland interstadials of the 20-50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these inter...
During the last glacial period, Greenland's climate shifted between cold (stadial) and warm (interstadial) phases that were accompanied by ocean circulation changes characterized by reduced Atlantic Meridional Overturning Circulation (AMOC) during stadials. Here, we present new data from the western tropical Atlantic demonstrating that AMOC slowdow...
Well-dated benthic foraminifer oxygen isotopic records (d18O) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic d18O cannot be used as a global correlation tool with mille...
Benthic foraminiferal Mg/Ca has been shown to have great potential as a
proxy for reconstructing deep water temperatures. However, the exact
relationship between Mg uptake in benthic foraminifera and temperature
is still ambiguous, and further exploration and refinement is much
needed to reduce uncertainties associated with the method. Here, we
pre...
The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meri...
The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meri...
Variations of the Atlantic Meridional Overturning Circulation (AMOC) are believed to have crucially influenced Earth's climate due to its key role in the inter-hemispheric redistribution of heat and carbon. To assess its past strength, the sedimentary 231Pa/230Th proxy has been developed and improved but also contested due to its sensitivity to oth...
1] Well‐dated benthic foraminifer oxygen isotopic records (d 18 O) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic d 18 O cannot be used as a global correlation tool wit...
Studies from the subtropical western and eastern Atlantic Ocean, using the 231Pa/230Th ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new...
The Holocene is commonly referred to as a period of relatively stable
climate conditions. It is however affected by a climate anomaly 8.2 kyr
ago, postulated to be the result of weakened Meridional Overturning
Circulation (MOC) triggered by a freshwater outburst. This time period
offers then a good opportunity to study the relationship between
inte...
Studies from the subtropical western and eastern Atlantic Ocean, using the 231Pa/230Th ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new...
Calcitic crusts of calcareous red algae could be suitable material for age determination of raised marine deposits and palaeothermometry at annual to sub-annual resolution. We examined the potential of U–Th dating of cold-water calcareous algae by analysing fossil specimens ( n =10) from Kapp Ekholm (Svalbard) and recent specimens from Norway ( n =...
The last glacial was punctuated by several massive ice sheet surges into
the North Atlantic that impacted surface water hydrology especially
where icebergs melted. However, the links between variations in surface
water hydrology and surface water productivity during these Heinrich
events (HEs) remain uncertain. To address this issue, diatoms and
or...
he last glacial was punctuated by several massive ice sheet surges into the North Atlantic that impacted surface water hydrology especially where icebergs melted. However, the links between variations in surface water hydrology and surface water productivity during these Heinrich events (HEs) remain uncertain. To address this issue, diatoms and org...
Evidences of strong millennial-scale climate variability, especially marked during MIS3, have been reported worldwide in high-resolution records. These pronounced climate changes, known as Dansgaard-Oeschger cycles, are characterized by sudden shifts in temperature, dust content and concentration of methane. Some of the longest Dansgaard-Oescher st...
A first study from the subtropical western Atlantic, using 231Pa/230Th ratios as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of Meridional Overturning Circulation (MOC) over the last deglaciation. However, these results warrant confirmation from additional locations and w...
Past changes in ocean circulation may be estimated from reorganization of subsurface water masses as indicated by nutrient proxies such as d13C. These reconstructions are invaluable, yet the changes they reveal are not necessarily related to the climatically significant transport of heat. Better estimates of this transport may be made using dynamic...
A new record of bulk sedimentary 231Pa/230Th excesses from core GGC5 on
the Bermuda Rise has been produced by ICP-MS. The record reveals
several aspects of the strength of the meridional overturning
circulation during the last ten thousand years. Measurements of
uranium, protactinium and thorium in the Holocene section recovered in
GGC5 have been r...
The ocean's meridional overturning circulation (MOC) is an important mechanism for heat transport and inter-basin exchange of water and salt. Changes in the rate of the Atlantic MOC are widely believed to affect climate but a direct link with past climate variability has been difficult to demonstrate. Although past changes in Atlantic MOC have been...
The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies, but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the r...
The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies (Boyle and Keigwin, 1987, doi:10.1038/330035a0), but their impact on climate is difficult to assess because such reconstru...
The rapid climatic changes of the last deglaciation offer a good opportunity to study the relationship between climate, surface water hydrology and thermohaline circulation in particular during cold events known as Heinrich 1 (H1) and Younger Dryas (YD). Core MD95-2037 (37^o05,23 N; 32^o01,87 W, 2100 m) presents a very high sedimentation rate with...
The Earth' climate response to insolation changes is affected by the
non-linear evo- lution of some of the main climatic components, in
particular, ice sheet and thermo- haline circulation (THC). We present
multy-proxy results (isotopic ratio d13C, d18O of benthic foraminifera
and 231Pa/230Th in bulk sediment) to better understand the chaining of
e...
We present new results concerning variable rates of thermohaline circulation (THC) in the North Atlantic during the last deglaciation, based on the ratio of 231Pa/230Th in marine sediments. We have focused our study on four cores located at different depths, in order to evaluate the strength of the circulation at different levels, and also integrat...
A multi-proxy approach to evaluating thermohaline circulation (THC) in the North Atlantic yields evidence of marked changes in both the configuration and strength of abyssal ventilation during the last ice age and subsequent deglacial transition. Stable carbon isotopes (delta 13C) in benthic foraminifera were used to reconstruct water mass structur...
