Sofia Ribeiro

Sofia Ribeiro
Geological Survey of Denmark and Greenland · Department of Glaciology and Climate

PhD

About

76
Publications
25,477
Reads
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1,449
Citations
Introduction
My research interests lie at the interface of the Earth and Life Sciences, and my overall goal is to advance the societal-relevant understanding of the impact of climate and environmental change on marine ecosystems. With that aim, I investigate ocean-cryosphere-biosphere interactions in the Arctic region from seasons to millennia, using biogenic tracers preserved in marine sediment records as a primary tool. The current research topics in our group include : 1) Holocene palaeoceanography and climate history of Greenland; 2) Discovery and development of new proxies for Arctic climate and environmental change (e.g. sedaDNA); 3) Marine micropaleontology; 4) Cryosphere change impacts on arctic marine ecosystems
Additional affiliations
July 2017 - present
Geological Survey of Denmark and Greenland
Position
  • Senior Researcher
January 2014 - June 2017
Geological Survey of Denmark and Greenland
Position
  • Researcher
January 2012 - January 2014
Lund University
Position
  • Fellow

Publications

Publications (76)
Article
Full-text available
In order to establish a baseline for proxy-based reconstructions for the Young Sound–Tyrolerfjord system (Northeast Greenland), we analysed the spatial distribution of primary production and sea ice proxies in surface sediments from the fjord, against monitoring data from the Greenland Ecosystem Monitoring Programme. Clear spatial gradients in orga...
Article
Full-text available
Many marine protists form resting stages that can remain viable in coastal sediments for several decades. Their long-term survival offers the possibility to explore the impact of changes in environmental conditions on population dynamics over multidec-adal time scales. Resting stages of the phototrophic dinoflagellate Pentapharsodinium dalei were i...
Article
Full-text available
Ribeiro, S., Moros, M., Ellegaard, M. & Kuijpers, A. 2012 (January): Climate variability in West Greenland during the past 1500 years: evidence from a high-resolution marine palynological record from Disko Bay. Boreas, Vol. 41, pp. 68–83. 10.1111/j.1502-3885.2011.00216.x. ISSN 0300-9483. Here we document late-Holocene climate variability in West Gr...
Article
Full-text available
Marine protist species have been used for several decades as environmental indicators under the assumption that their ecological requirements have remained more or less stable through time. However, a growing body of evidence suggests that marine protists, including several phytoplankton species, are in fact highly diverse and may quickly respond t...
Article
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Photosynthesis evolved in the oceans more than 3 billion years ago and has persisted throughout all major extinction events in Earth's history. The most recent of such events is linked to an abrupt collapse of primary production due to darkness following the Chicxulub asteroid impact 65.5 million years ago. Coastal phytoplankton groups (particularl...
Article
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The Fram Strait is one of the largest gateways through which meltwater and sea ice are exported to the subarctic North Atlantic, transiting the North-East Greenland shelf via the southward flowing East Greenland Current. Observations indicate a recent freshening of the East Greenland Current that may have implications for wider oceanic circulation...
Article
Climate warming and the resulting acceleration of freshwater discharge from the Greenland Ice Sheet are impacting Arctic marine coastal ecosystems, with implications for their biological productivity. To accurately project the future of coastal ecosystems and place recent trends into perspective, palaeo-records are essential. Here, we show runoff e...
Article
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Polysaccharides constitute an important carbon pool in marine systems, but much is still unknown about the fate and degradation of these compounds. They are derived partly from production in situ, and in coastal areas, they are partly terrestrially derived, originating from freshwater runoff from land. The aim of this study was to test the applicab...
Preprint
Full-text available
Climate warming and the resulting acceleration of freshwater discharge from the Greenland Ice Sheet are impacting Arctic marine coastal ecosystems, with implications for their biological productivity. To accurately project the future of coastal ecosystems, and place recent trends into perspective, paleo-records are essential. Here, we present late...
Article
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Frozen components on land and in the ocean (sea ice, ice sheets, glaciers and permafrost) form the cryosphere, which, together with the ocean, moderates the physical and chemical habitat for life in the Arctic and beyond. Changes in these components, as a response to rapidly warming climate in the Artic, are intensely expressed in the coastal zone....
Article
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The accelerating sea-ice, ice sheet and glacial melt associated with climate warming have resulted in important changes in the Arctic region over the past decades. In northern Baffin Bay, the formation of the North Open Water (NOW) polynya, which is intrinsically linked to regional sea-ice conditions and ocean circulation, has become more variable...
Article
Full-text available
High Arctic ecosystems and Indigenous livelihoods are tightly linked and exposed to climate change, yet assessing their sensitivity requires a long-term perspective. Here, we assess the vulnerability of the North Water polynya, a unique sea ice ecosystem that sustains the world’s northernmost Inuit communities and several keystone Arctic species. W...
Article
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Baffin Bay hosts the largest and most productive of the Arctic polynyas: the North Water (NOW). Despite its significance and active role in water mass formation, the history of the NOW beyond the observational era remains poorly known. We reconcile the previously unassessed relationship between long-term NOW dynamics and ocean conditions by applyin...
Conference Paper
Full-text available
Since the seminal paper in 1998 (Coolen and Overmann), sedimentary ancient DNA (sedaDNA) has become a powerful tool in paleoecology to reconstruct past changes in terrestrial and aquatic biodiversity. Still, sedaDNA is an emerging tool and there is a need for calibrations and validations to ensure the reliability of sedaDNA as a proxy to reconstruc...
Conference Paper
The high latitudes of the Northern Hemisphere have experienced the largest regional warming over the last decades. On the Greenland ice sheet, rapid changes are observed in response to temperature increase, with the amount of liquid water at the surface particularly increasing. Understanding Greenland’s ice sheet hydrology is essential to assess it...
Article
Full-text available
Climate warming is rapidly reshaping the Arctic cryosphere and ocean conditions, with consequences for sea ice and pelagic productivity patterns affecting the entire marine food web. To predict how ongoing changes will impact Arctic marine ecosystems, concerted effort from various disciplines is required. Here, we contribute multi-decadal reconstru...
Article
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Four marine sediment cores from two sites in the Independence Fjord system near the Wandel Sea in eastern North Greenland were analyzed for their dinoflagellate cyst (dinocyst) and foraminiferal fossil content to gain insight into the water mass properties and evolution of the outer fjord system over the Holocene and Last Glacial Period. While rega...
Article
We recorded diatom species succession over one full year (May 2017–May 2018) using automated sediment traps installed in two contrasting Greenlandic fjords: the seasonally ice-covered Young Sound in high-arctic Northeast Greenland and the nearly sea-ice free Godthåbsfjord in subarctic Southwest Greenland. The traps were positioned at differing wate...
Article
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Freshwater discharge from glaciers is increasing across the Arctic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier–ocean interaction...
Article
Full-text available
DNA can be preserved in marine and freshwater sediments both in bulk sediment and in intact, viable resting stages. Here, we assess the potential for combined use of ancient, environmental, DNA and timeseries of resurrected long-term dormant organisms, to reconstruct trophic interactions and evolutionary adaptation to changing environments. These n...
Article
Nares Strait is one of three channels that connect the Arctic Ocean to Baffin Bay. Unique sea-ice conditions in the strait lead to the formation of landfast ice arches at its northern and southern ends. These ice arches regulate Arctic sea-ice and freshwater export through the strait and promote the opening of the North Water polynya. The present s...
Article
Full-text available
A long-term perspective is essential for understanding environmental change. To be able to access the past, environmental archives such as marine and lake sediments that store information in the form of diverse proxy records are used. Whilst many analytical techniques exist to extract the information stored in these proxy records, the critical asse...
Article
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Between 1850 and 2006 global mean sea level rose by 24 ± 18 cm. It is projected to rise a further 52 ± 21 cm under the Representative Concentration Pathway (RCP) 4.5 scenario, which approximates the carbon emissions reductions of the ‘Paris Agreement’ climate pathway. It is projected to rise 74 ± 28 cm under the RCP8.5 scenario, which represents a...
Preprint
Full-text available
Freshwater discharge from glaciers is increasing across the Artic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier-ocean interactions...
Article
Full-text available
Europæiske hvalfangere var særdeles aktive i det 17.-19. århundrede i Nordatlanten og op langs Grønlands vestkyst. I forbindelse med hvalfangsten blev der indsamlet store mængder data og informationer om blandt andet fangstforhold, klima og havisens udbredelse. I dag findes disse informationer i form af logbøger, officielle dokumenter og dagbøger,...
Presentation
Full-text available
The North Water Polynya sustains a particularly rich and diverse marine food web and is sensitive to changing conditions in the ocean and atmosphere and therefore especially vulnerable to climate change. This study aims to reconstruct the marine conditions during the Holocene Climate Optimum to predict response to future climate changes. Cores AMD1...
Article
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We present a summary of two round-table discussions held during two subsequent workshops in Montreal (Canada) on 16 April 2014 and Ostend (Belgium) on 8 July 2015. Five species of the genus Achomosphaera Evitt 1963 and 33 of the genus Spiniferites Mantell 1850 emend. Sarjeant 1970 occuring in Pliocene to modern sediments are listed and briefly desc...
Article
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The biomarker IP25 and fossil diatom assemblages preserved in seafloor sediments are commonly used as proxies for paleo Arctic sea-ice reconstructions, but how their production varies over the seasons and is exported to the sediment remains unclear. We analyzed IP25 concentrations and diatom assemblages from a 5-week consecutive series of sea-ice c...
Thesis
The North Water Polynya sustains a particularly rich and diverse marine food web and is sensitive to changing conditions in the ocean and atmosphere and therefore especially vulnerable to climate change. This assignment aims to reconstruct the marine conditions during the Holocene Climate Optimum to predict response to future climate changes. Cores...
Article
Full-text available
In the past decade, research on long-term persistence of phytoplankton resting stages has intensified. Simultaneously, insight into life-cycle variability in the diverse groups of phytoplankton has also increased. Aquatic 'seed banks' have tremendous significance and show many interesting parallels to terrestrial seed beds of vascular plants, but a...
Article
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Palynological analyses of sediment core MSM343310 from Disko Bugt (68°38’861 N, 53°49’493 W) document decadal- to centennial-scale variability of sea-surface conditions during the last ca. 3600 years. High dinocyst fluxes (>104 cysts/cm2year1) indicate a very high productivity. Dinocyst assemblages dominated by Islandinium minutum, Brigantedinium s...
Article
Full-text available
The European trading and whaling activities of the 17th–19th centuries provide records of climate and sea- ice conditions off West Greenland in the form of ships’ logs and other official documents in many archives around Europe. These documents, combined with evidence from marine sediments, help describe climate changes in general, and sea-ice volu...
Article
Full-text available
The eastern North coast of Greenland is considered to be highly sensitive to the ongoing Arctic warming, but there is a general lack of data on modern conditions and in particular on the modern distribution of climate and environmental proxies to provide a baseline and context for studies on past variability. Here, we present a detailed investigati...
Article
Full-text available
Undisturbed records of resting stages produced in the past and stored in coastal sediments are very valuable to science, because they may provide unique insights into past evolutionary and ecological trajectories. Within marine phytoplankton, multi-decadal time series of monoclonal strains germinated from resting stages have been established for di...
Chapter
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Dinoflagellates are important components of marine plankton as both primary producers and predators on bacteria and microeukaryotes. About 200 species, most of these estuarine, form a resting stage, called a cyst, as part of their life-cycle. Dinoflagellate cysts are mostly organic, composed of a very resistant material called dinosporin, and are o...
Article
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Mean body size decreases with increasing temperature in a variety of organisms. This size–temperature relationship has generally been tested through space but rarely through time. We analyzed the sedimentary archive of dinoflagellate cysts in a sediment record taken from the West Greenland shelf and show that mean cell size decreased at both intra-...
Poster
Full-text available
Changes in sea ice and iceberg conditions in and around Inglefield Bredning during the past 40 years were analyzed using high resolution optical imagery supplemented with radar satellite imagery. with the purpose of evaluating and calibrating climate-proxy reconstructions based on marine sediment core records, a 117 year fast ice time series was al...
Article
We present the first multi-site study of dinoflagellate cyst records spanning ca. AD 1860–2000 from the west Iberian coast. Our aim was to reconstruct environmental changes in the Western Iberia Upwelling Ecosystem, one of the most biologically productive areas in the world, and an active fishery region. A major shift in cyst assemblages was record...
Article
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The marine record of the Independence–Danmark fjord system extending out to the Wandel Hav in eastern North Greenland (Fig. 1A) is little known due to the almost perennial sea-ice cover, which makes the region inaccessible for research vessels (Nørgaard-Pedersen et al. 2008), and only a few depth measurements have been conducted in the area. In 201...
Article
Protoperidinium species with two anterior intercalary plates were originally classified by Jörgensen in the subgenus Archaeperidinium and assigned to the sections Excentrica, Avellana and Archaeperidinium by Taylor, on the basis of the relative size of anterior intercalary plates and the extent of cingulum displacement. Phylogenetic relationships a...
Article
Full-text available
A comparison of the Medieval fjord hydrography and climate regime of the main Norse settlements in Greenland demonstrates important differences in the timing of sea-ice expansion and storminess when comparing the Western and Eastern Settlement regions. The Western Settlement, as well as the northern hunting grounds around Disko Bugt, had already ex...
Article
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Integrated sediment multiproxy studies and modeling were used to reconstruct past changes in the Baltic Sea ecosystem. Results of natural changes over the past 6000 years in the Baltic Sea ecosystem suggest that forecasted climate warming might enhance environmental problems of the Baltic Sea. Integrated modeling and sediment proxy studies reveal i...
Chapter
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This overview of methodology and applications of sediment archives of living dinofla-gellates and other protists examines their potential to study ecology and evolution of unicellular eukaryotes through time. Sediment cores from Koljö Fjord on the west coast of Sweden and from Mariager Fjord in Northern Denmark, both enclosed embayments with recurr...
Article
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Effective population size (Ne) determines the rate of genetic drift and the relative influence of selection over random genetic changes. While free-living protist populations characteristically consist of huge numbers of cells (N), the absence of any estimates of contemporary Ne raises the question whether protist effective population sizes are com...
Data
Upper pH tolerance limits for growth for the 18 Pentapharsodinium dalei strains at salinity 15 and 30. (DOCX)
Article
Full-text available
Pentapharsodinium dalei is a widely distributed cold-water dinoflagellate, which is used in palaeoecology as an indicator of relatively warmer conditions in polar and sub-polar regions. This species has been proposed to be one of the first indicators of global warming at high latitudes. We devel-oped the first microsatellite markers for P. dalei to...
Article
In this paper we describe a new species, Archaeperidinium saanichi sp. nov. within the Archaeperidinium minutum Jörgensen 1912 species complex. We examined the morphological variation of the cyst and motile stage by incubation experiments from sediment samples collected in coastal British Columbia (Canada), and compared it to closely related specie...
Article
Full-text available
The phytoplankton species Gymnodinium catenatum is responsible for major worldwide losses in aquaculture due to shellfish toxicity. On the West coast of the Iberian Peninsula, toxic blooms have been reported since the mid-1970s. While the recent geographical spread of this species into Australasia has been attributed to human-mediated introduction,...
Article
Full-text available
We report on the survival and germination of up to a century-old marine protist resting stages naturally preserved in sediments from Koljö Fjord on the west coast of Sweden. This work has focused on germination of dinoflagellate cysts, but diatom resting stages were also observed. We record the longest known survival of dormant dinoflagellate cells...
Poster
Scandinavian sill fjords, such as Koljö Fjord in Sweden, are unique environments with limited oxygen supply, minimum tidal activity, continuous accumulation of fine sediment and virtually no bioturbation. This allows for the formation and preservation of laminated sediments which are a natural archive with great potential for temporal studies. Dino...
Article
Full-text available
2010. Protoperidinium minutum (Dinophyceae) from Portugal: cyst–theca relationship and phylogenetic position on the basis of single-cell SSU and LSU rDNA sequencing. Round brown spiny cysts are common elements of Recent and Quaternary dinoflagellate cyst records and are often used to infer past climate conditions. Echinidinium and Islandinium, two...