Article
|
Open Access
Featured
-
-
Article
| Open AccessSea-ice retreat suggests re-organization of water mass transformation in the Nordic and Barents Seas
Water mass transformation in the Nordic and Barents Seas is important for the Atlantic Meridional Overturning Circulation (AMOC). Here, the authors show increases in air-sea heat fluxes linked to sea ice retreat along the boundary currents of the Nordic and Barents Seas that could influence how the AMOC reacts to climate change.
- G. W. K. Moore
- , K. Våge
- & R. S. Pickart
-
Article
| Open AccessPhylogenetically and functionally diverse microorganisms reside under the Ross Ice Shelf
The Ross Ice Shelf is the most extensive ice shelf of Antarctica and isolates the underlying ocean from sunlight. Here the authors use multi-omics to unravel the phylogenetic and functional diversity of microbial life in this ecosystem.
- Clara Martínez-Pérez
- , Chris Greening
- & Federico Baltar
-
Article
| Open AccessSea-ice derived meltwater stratification slows the biological carbon pump: results from continuous observations
The North Atlantic biological pump has the most intense absorption of C globally, but how this will fare in light of climate changes (especially sea-ice melting) is poorly understood. Here the authors present a 24-month continuous time series of physical, chemical, and biological observations in the Fram Strait.
- Wilken-Jon von Appen
- , Anya M. Waite
- & Antje Boetius
-
Article
| Open AccessKrill and salp faecal pellets contribute equally to the carbon flux at the Antarctic Peninsula
Zooplankton impact Southern Ocean carbon cycling. Here, the authors examine carbon export at the Antarctic Peninsula, finding that krill pellets are efficiently exported, while salp pellets are retained and recycled in surface waters.
- Nora-Charlotte Pauli
- , Clara M. Flintrop
- & Morten H. Iversen
-
Article
| Open AccessLearning efficient navigation in vortical flow fields
Navigation and trajectory planning in environments with background flow, relevant for robotics, are challenging provided information only on local surrounding. The authors propose a reinforcement learning approach for time-efficient navigation of a swimmer through unsteady two-dimensional flows.
- Peter Gunnarson
- , Ioannis Mandralis
- & John O. Dabiri
-
Comment
| Open AccessEmergence of a neopelagic community through the establishment of coastal species on the high seas
Discoveries of persistent coastal species in the open ocean shift our understanding of biogeographic barriers. Floating plastic debris from pollution now supports a novel sea surface community composed of coastal and oceanic species at sea that might portend significant ecological shifts in the marine environment.
- Linsey E. Haram
- , James T. Carlton
- & Gregory M. Ruiz
-
Article
| Open AccessSubstantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones
Oxygen is fundamental for marine life, yet it is absent from large areas of the ocean. Here the authors demonstrate that microbial nitrite oxidation effectively consumes oxygen where oxygen concentrations are low, playing a pivotal role in these regions.
- J. M. Beman
- , S. M. Vargas
- & S. D. Wankel
-
Article
| Open AccessHydrothermal plumes as hotspots for deep-ocean heterotrophic microbial biomass production
Hydrothermal vents are biogeochemically important, but their contribution to the carbon cycle is poorly constrained. Here the authors build a biogeochemical model that estimates autotrophic and heterotrophic production rates of microbial communities within hydrothermal plumes along mid-ocean ridges.
- Cécile Cathalot
- , Erwan G. Roussel
- & Pierre-Marie Sarradin
-
Article
| Open AccessSpecies richness and identity both determine the biomass of global reef fish communities
Species identity and richness both contribute biodiversity-ecosystem functioning relationships. Here the authors apply a decomposition approach inspired by the Price equation to a global dataset of reef fish community biomass, finding that increased richness and community compositions favouring large-bodied species enhance biomass.
- Jonathan S. Lefcheck
- , Graham J. Edgar
- & Aneil F. Agrawal
-
Article
| Open AccessSeasonal mixed layer depth shapes phytoplankton physiology, viral production, and accumulation in the North Atlantic
Phytoplankton are important primary producers. Here the authors investigate phytoplankton physiological changes associated with bloom phases and mixing regimes in the North Atlantic, finding that stratification and deep mixing shape accumulation rates by altering physiology and viral production.
- Ben P. Diaz
- , Ben Knowles
- & Kay D. Bidle
-
Article
| Open AccessGateway-driven weakening of ocean gyres leads to Southern Ocean cooling
The role of Southern Ocean gateways contributing to the Eocene-Oligocene climate transition is still debated. Here, the authors present high-resolution ocean simulations to show that gateways opening led to a reorganization of ocean circulation, heat transport and Antarctic surface water cooling.
- Isabel Sauermilch
- , Joanne M. Whittaker
- & Joseph H. LaCasce
-
Article
| Open AccessDynamic Europa ocean shows transient Taylor columns and convection driven by ice melting and salinity
The deep ocean of Jupiter’s moon Europa is one of the prime candidates for finding life outside Earth within the solar system. Here, the authors show that Europa’s ocean is energetic, yet weakly stratified with its density dominated by salinity effects.
- Yosef Ashkenazy
- & Eli Tziperman
-
Article
| Open AccessImpact of intensifying nitrogen limitation on ocean net primary production is fingerprinted by nitrogen isotopes
Projected declines in marine primary production are underpinned by a slowdown in nitrogen supplied to surface waters. Here the authors detail a new means to detect this slowdown and describe major shifts in the 21st century oceanic nitrogen cycle.
- Pearse J. Buchanan
- , Olivier Aumont
- & Alessandro Tagliabue
-
Article
| Open AccessGlobally consistent assessment of coastal eutrophication
Satellite-derived chlorophyll data and Google Earth Engine (GEE) are used to introduce the first global map of coastal eutrophication potential as a GEE app. The prospects of the app being used as a global framework for eutrophication screening/monitoring are discussed.
- Elígio de Raús Maúre
- , Genki Terauchi
- & Michael DeWitt
-
Article
| Open AccessIncreased risk of near term global warming due to a recent AMOC weakening
New climate models show a stronger warming with greenhouse gas emissions than is suggested by observations. Here, the authors argue that internal variability of the Atlantic Ocean may have dampened some of the recent warming, which could explain part of the disagreement between the newer models and observations.
- Rémy Bonnet
- , Didier Swingedouw
- & Adriana Sima
-
Article
| Open AccessIndian Ocean Dipole leads to Atlantic Niño
The Atlantic Niño is an important mode of tropical Atlantic variability that influences the climate conditions in surrounding areas. Here, the authors use observational data and model simulations to show that positive phases of the Indian Ocean Dipole can trigger Atlantic Niño events.
- Lei Zhang
- & Weiqing Han
-
Article
| Open AccessElucidating gene expression adaptation of phylogenetically divergent coral holobionts under heat stress
As corals struggle to survive under climate change, it is crucial to know whether they can withstand increasing seawater temperatures. Using a controlled thermal stress experiment across three divergent coral holobionts, this study examines metatranscriptomic responses to heat stress corresponding to the coral host, photosymbionts and associated microbiota.
- Viridiana Avila-Magaña
- , Bishoy Kamel
- & Mónica Medina
-
Article
| Open AccessAn intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys
In ultraslow-spreading ridges intermittent detachment faulting could contribute to discontinuous magmatic accretion supporting the development of massive sulfide deposits. Here the authors using a multi-scale magnetic survey of the Southwest Indian Ridge constrain that an episode of detachment faulting took place 0.7-1.48 Ma, with the present fault active since 0.33 Ma.
- Tao Wu
- , Maurice A. Tivey
- & Yunlong Liu
-
Article
| Open AccessDiel cycle of sea spray aerosol concentration
Sea spray aerosol (SSA) are an important way through which oceans can influence the atmosphere’s radiative properties. Here, the authors present measurements taken over a 42,000 km ship cruise in the Atlantic and Pacific Ocean and show that SSA number concentrations vary over a 24-hour cycle, possibly linked to surface water bubble-bursting dynamics.
- J. Michel Flores
- , Guillaume Bourdin
- & Ilan Koren
-
Article
| Open AccessImpact of global cooling on Early Cretaceous high pCO2 world during the Weissert Event
Modelling and sea surface temperature proxy data from the Weddell Sea document a 3–4 °C drop coinciding with the Early Cretaceous Weissert Event. Temperature data worldwide confirm a 3.0 °C global mean surface cooling, equivalent to a ~40% drop in atmospheric pCO2, favouring local polar ice.
- Liyenne Cavalheiro
- , Thomas Wagner
- & Elisabetta Erba
-
Article
| Open AccessFuture phytoplankton diversity in a changing climate
Phytoplankton form the base of the marine ecosystem but current ocean models used for climate change projections are too simple to assess potential changes in plankton community structure. This study analyses a complex ecosystem model with 35 phytoplankton types to evaluate the changes in phytoplankton community composition, turnover and size structure over the 21st century.
- Stephanie A. Henson
- , B. B. Cael
- & Stephanie Dutkiewicz
-
Article
| Open AccessMajor restructuring of marine plankton assemblages under global warming
Warming will affect marine plankton biomass, but also its diversity and community composition in poorly understood ways. Here, the authors model the spatial distribution of 860 marine plankton species from 10 functional groups and identify the future hotspots of climate change impacts under RCP8.5.
- Fabio Benedetti
- , Meike Vogt
- & Nicolas Gruber
-
Article
| Open AccessLagrangian betweenness as a measure of bottlenecks in dynamical systems with oceanographic examples
The motion of the ocean transports microorganisms, pollutants, and other particles, but these are challenging to track. Here the authors present a Lagrangian form of Betweenness Centrality which identifies bottlenecks in dynamical systems and fluid flows as well as an interpretation of diversity hotspots.
- Enrico Ser-Giacomi
- , Alberto Baudena
- & Emilio Hernández-García
-
Article
| Open AccessDecline in plankton diversity and carbon flux with reduced sea ice extent along the Western Antarctic Peninsula
Over the past century, the Western Antarctic Peninsula has experienced rapid warming and a substantial loss of sea ice with important implications for plankton biodiversity and carbon cycling. Using a 5-year DNA metabarcoding dataset, this study assesses how interannual variability in sea-ice conditions impacts biodiversity and biological carbon fluxes in this region.
- Yajuan Lin
- , Carly Moreno
- & Nicolas Cassar
-
Article
| Open AccessAtmospheric wavenumber-4 driven South Pacific marine heat waves and marine cool spells
Marine heat waves and cold spells threaten ocean ecosystems and are thought to be increasing with climate change. Here the author shows that MHW/MCS in the Tasman Sea co-occur with corresponding events in the Atlantic, Indian, and Pacific Oceans, and these southern hemisphere events are driven by stalling of a global wavenumber-4 atmospheric wave.
- Stephen M. Chiswell
-
Article
| Open AccessStructural evidence for extracellular silica formation by diatoms
Silica formation in diatoms is of interest for a range of different subjects from biomimetics to oceanography. Here the authors study the formation of silicified extensions in diatoms and find that unlike cell wall elements, that form in the cytoplasm, the extensions have a different formation mechanism outside the cytoplasm.
- Boaz Mayzel
- , Lior Aram
- & Assaf Gal
-
Article
| Open Access20th century cooling of the deep ocean contributed to delayed acceleration of Earth’s energy imbalance
Cooling of the global ocean below 2000 m counteracted some of the warming of the shallow ocean over much of the late 20th century. Here the authors show that this trend has shifted to warming, leading the deep ocean to absorb a meaningful fraction of total ocean heat during the 21st century.
- A. Bagnell
- & T. DeVries
-
Article
| Open AccessRapid ecosystem-scale consequences of acute deoxygenation on a Caribbean coral reef
How acute deoxygenation events affect tropical marine ecosystems remains poorly understood. This study integrates analyses of coral reef benthic communities with microbial community sequencing to show how a deoxygenation event rapidly altered a shallow tropical coral reef ecosystem in the Caribbean.
- Maggie D. Johnson
- , Jarrod J. Scott
- & Andrew H. Altieri
-
Article
| Open AccessDiffusion controls the ventilation of a Pacific Shadow Zone above abyssal overturning
The deep North Pacific is the end of the road for global ocean circulation, but the circulation patterns and ventilation are poorly understood. Here the authors show that diffusive transports both along and across density layers play a leading role in returning 1,400 year old water to the surface.
- Mark Holzer
- , Tim DeVries
- & Casimir de Lavergne
-
Matters Arising
| Open AccessReply to: “Questions remain about the biolability of dissolved black carbon along the combustion continuum”
- Yuanzhi Qi
- , Wenjing Fu
- & Xuchen Wang
-
Matters Arising
| Open AccessQuestions remain about the biolability of dissolved black carbon along the combustion continuum
- Sasha Wagner
- , Alysha I. Coppola
- & Hongyan Bao
-
Article
| Open AccessThermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica
Basal melting of ice shelves is the principal driver of recent ice mass loss in Antarctica. The study reports comprehensive structures of temperature, salinity and current under an ice shelf in East Antarctica obtained by borehole measurements.
- Masahiro Minowa
- , Shin Sugiyama
- & Shigeru Aoki
-
Article
| Open AccessGlobal distribution patterns of marine nitrogen-fixers by imaging and molecular methods
Nitrogen fixation by diazotrophs is critical for marine primary production. Using Tara Oceans datasets, this study combines a quantitative image analysis pipeline with metagenomic mining to provide an improved global overview of diazotroph abundance, diversity and distribution.
- Juan José Pierella Karlusich
- , Eric Pelletier
- & Rachel A. Foster
-
Article
| Open AccessVelocity bias in intrusive gas-liquid flow measurements
Estimating velocities in gas liquid flows is of importance in many engineering applications. Hohermuth et al. show that previous bubble velocities obtained from intrusive probes have been underestimated and provide a correction scheme for more accurate velocity measurements.
- B. Hohermuth
- , M. Kramer
- & D. Valero
-
Article
| Open AccessQuantifying nitrogen fixation by heterotrophic bacteria in sinking marine particles
N2 fixation by heterotrophic bacteria has recently been found to take place on sinking marine particles, but an understanding of its regulation and importance is lacking. Here the authors develop a trait-based model for this N2 fixation, finding that this once overlooked process could have global importance.
- Subhendu Chakraborty
- , Ken H. Andersen
- & Lasse Riemann
-
Article
| Open AccessClimate pacing of millennial sea-level change variability in the central and western Mediterranean
How sea-level in the western Mediterranean reacts to climate changes is not well known. Here, the authors present a regional reconstruction and show that temperatures influenced sea-level change rates during the Holocene, while recent sea-level rise is happening faster than during any other period of the last 4000 years.
- Matteo Vacchi
- , Kristen M. Joyse
- & Alessio Rovere
-
Article
| Open AccessGlobal coastal attenuation of wind-waves observed with radar altimetry
Reprocessed data from satellite altimetry show that the mean significant wave height decreases globally by 22% on average from 30 km to 3 km from the coast. By combining these data with wave period from reanalysis, we estimate a mean reduction of 38% concerning the mean wave energy flux.
- Marcello Passaro
- , Mark A. Hemer
- & Florian Seitz
-
Article
| Open AccessA global analysis of extreme coastal water levels with implications for potential coastal overtopping
As sea levels rise, coasts are being increasingly threatened by overtopping caused by the combination of sea level rise, storm surge and wave runup. Here the authors find that global coastal overtopping has increased by over 50% in the last two decades, and under a RCP 8.5 scenario this could increase up to 50 times by 2100 compared to today.
- Rafael Almar
- , Roshanka Ranasinghe
- & Elodie Kestenare
-
Article
| Open AccessRadioisotope constraints of Arctic deep water export to the North Atlantic
North Atlantic deep water (NADW) formation influences the climate and carbon cycle, but the contribution of Arctic waters is difficult to constrain. Here the authors use Pa/Th proxy measurements to determine the amount of Arctic Ocean water that flows through the Fram Strait and contributes to NADW.
- Lauren E. Kipp
- , Jerry F. McManus
- & Markus Kienast
-
Article
| Open AccessNanomolar phosphate supply and its recycling drive net community production in the subtropical North Pacific
Primary productivity in the oligotrophic ocean sustains Earth’s ecosystems, but nutrient concentrations are vanishingly low. Here the authors measure nanomolar macronutrient concentrations in the North Pacific and find that net community production is sustained through high rates of phosphorus recycling.
- Fuminori Hashihama
- , Ichiro Yasuda
- & Masao Ishii
-
Article
| Open AccessLateral advection supports nitrogen export in the oligotrophic open-ocean Gulf of Mexico
The middle of the Gulf of Mexico is stratified and highly oligotrophic, yet there are anomalously high fluxes of sinking particulate matter from the euphotic zone. Here the authors show that lateral advection of organic matter supports nitrogen export in the Gulf of Mexico’s open ocean.
- Thomas B. Kelly
- , Angela N. Knapp
- & Michael R. Stukel
-
Article
| Open AccessSmall sinking particles control anammox rates in the Peruvian oxygen minimum zone
Up to 40% of the ocean’s fixed nitrogen is lost in oxygen minimum zones (OMZs) by anammox, but despite the importance of this process, nitrogen loss patterns in OMZs are difficult to predict. Here the authors show that ammonium release from small particles is a major control of anammox in the Peruvian OMZ.
- Clarissa Karthäuser
- , Soeren Ahmerkamp
- & Marcel M. M. Kuypers
-
Article
| Open AccessSubpolar North Atlantic western boundary density anomalies and the Meridional Overturning Circulation
Western boundary current variability in the subpolar North Atlantic is thought to reflect interior convection changes and determine Atlantic Meridional Overturning Circulation variability. Here, the authors show with an extended OSNAP time series that neither linkage is robust due to the complex dynamics in the region.
- F. Li
- , M. S. Lozier
- & C. Zhou
-
Article
| Open AccessNutrient content and stoichiometry of pelagic Sargassum reflects increasing nitrogen availability in the Atlantic Basin
The macroalgae Sargassum has grown for centuries in the oligotrophic North Atlantic supported by natural nutrient sources and cycling. Here the authors show that changes in tissue nutrient contents since the 1980s reflect global anthropogenic nitrogen enrichment, causing blooms in the wider Atlantic basin.
- B. E. Lapointe
- , R. A. Brewton
- & P. L. Morton
-
Article
| Open AccessThe 79°N Glacier cavity modulates subglacial iron export to the NE Greenland Shelf
A large fraction of ice sheet discharge enters the ocean subsurface from underneath large floating ice-tongues. Here the authors show that associated nutrient export may be governed by shelf circulation and, especially for Fe, particle-dissolved phase exchanges, which is largely independent from freshwater Fe content.
- Stephan Krisch
- , Mark James Hopwood
- & Eric Pieter Achterberg
-
Article
| Open AccessObserved interannual changes beneath Filchner-Ronne Ice Shelf linked to large-scale atmospheric circulation
New data from five hot-water drilled boreholes show how atmospheric anomalies affect the circulation beneath Filchner-Ronne Ice Shelf on multi-year time scales. The apparent link of the dense water formation to remote teleconnections is an important step for better predicting contributions to future sea level rise from this sector of Antarctica.
- Tore Hattermann
- , Keith W. Nicholls
- & Torsten Kanzow
-
Article
| Open AccessThe poleward enhanced Arctic Ocean cooling machine in a warming climate
The Arctic Ocean cooling machine, currently the Barents Sea, plays a crucial role in both regulating the climate and determining the deep ocean circulation. Here the authors show that the efficiency of the cooling machine is poleward enhanced in a warming climate, which pushes Arctic Atlantification poleward.
- Qi Shu
- , Qiang Wang
- & Fangli Qiao
-
Article
| Open AccessEconomic damages from Hurricane Sandy attributable to sea level rise caused by anthropogenic climate change
Sea level rise amplifies coastal storm impacts, but the role of anthropogenic climate change is poorly resolved. Here the authors reassess Hurricane Sandy, using a dynamic flood model to show that anthropogenic sea level rise added a central estimate of $8 billion in damages.
- Benjamin H. Strauss
- , Philip M. Orton
- & Sergey Vinogradov
-
Article
| Open AccessMarine snow morphology illuminates the evolution of phytoplankton blooms and determines their subsequent vertical export
Marine snow is a major route through which photosynthetically fixed carbon is transported to the deep ocean, but the factors affecting flux are largely unknown. Here the authors use high frequency imaging of marine snow particles collected during phytoplankton blooms to categorize and quantify transport.
- Emilia Trudnowska
- , Léo Lacour
- & Lars Stemmann