The world's oceans cover more than 70 percent of the earth's surface. They regulate the global climate because they bind a large part of the CO2 emissions produced by humans and also store and transport heat. In addition, half of our oxygen comes from the sea. At CEN, we deal, among other things, with the exchange of energy between the sea and the atmosphere, the rise in sea level, the importance of the salinity of the oceans for the climate, ecological changes, tsunamis and marine protection.
The floating university
Photo: Rolf Koppelmann
How habitat shifts can be predicted
Photo: Scandinavian Fishing Year Book
Though never seen so far north before, tuna and mackerel can now be found in the waters off Greenland. Climate change is affecting living conditions in the ocean, driving many species to migrate to new habitats. The fishing sector and political decision-makers have to respond – partly in order...
A more realistic picture of Europe’s fish numbers
Europe’s fishing sector relies on many biological assumptions underlying current fish stock assessment methods. The PANDORA project has created a new online tool that contains assessments and projections of 30 fish species found in Europe’s waters, integrating the latest biological knowledge...
How Much Carbon is Stored by Baltic Flora and Fauna
They reduce the Earth’s greenhouse effect and perform enormously valuable services for the climate: the oceans. In addition, they absorb a massive percentage of anthropogenic carbon dioxide emissions. In addition to chemical uptake, there is a biologically driven process. It begins with the...
Montevideo: Start of expedition SONETT
Photo: Manita Chouksey
Expedition M180 SONETT (Synoptic Observations - a Nested approach to study Energy Transfer & Turbulence in the ocean) is a key part of the ocean observations in the second phase of TRR181 'Energy transfers in Atmosphere and Ocean'. The expedition will take scientists to...
Santorini: Gleaning Volcanic History from the Ocean Floor
Photo: Jonas Preine/UHH
Santorini is a picturesque archipelago in the southern Aegean. The islands encircle a massive volcanic caldera, which the ocean has long-since covered over. Some speculate that Santorini is all that’s left of Atlantis – the fabled, highly advanced island empire that suddenly vanished. The fact...
Storm Warnings: When the Seafloor Shakes
Photo: D. Luckmann/unsplash
Video: Aboard the Meteor
Photo: Vincent Urban
Film meets marine research: cinematic insight into life on board
Fifteen scientists from the University of Hamburg and CEN were on board in September and October 2020 when the research vessel METEOR set off on expedition "M166" in the North Atlantic to investigate the connections between the...
Cod Population in the Western Baltic Beyond Tipping Point
Photo: UHH/CEN/P. Hornetz
Cod stocks in the Western Baltic have collapsed. A new study led by Christian Möllmann from Universität Hamburg’s CEN has shown that the “tipping point” for this population has already been exceeded. When such a tipping point is reached, it is highly unlikely that stocks will recover rapidly...
Predicting the future of cod
Until now, fisheries have set catch levels a year in advance. Long-term influences such as changes in water temperatures are not taken into account. In an international project, researchers from the Center of Earth System Science and Sustainability (CEN) and Helmholtz-Zentrum Hereon have now...
How will Baltic Fisheries Survive without Cod and Herring?
Photo: UHH/CEN/T. Wasilewski
Cod and herring are not faring well. Recently, the European Union once again adjusted the fishing quotas for Germany’s Baltic coast. As a result, many fishers have been forced to temporarily quit fishing or to sell their boats. Christian Möllmann is a fishery expert at Universität Hamburg’s...
Plant Community Adapts to Rising Sea Level
Photo: Thomas J. Mozdzer
Mangroves, salt marshes and seagrass are common along many coasts around the globe. They form unique ecosystems, which absorb huge amounts of carbon dioxide (CO2) from the atmosphere and oceans, and store it in their leaves, stems, branches and roots, as well as in the sediments below. However...
When the Fish in the Port Run Out of Air
Photo: Christin Woodford
In Hamburg’s port, you can sometimes see fish gasping for air just below the water’s surface. This is a sign that there isn’t much oxygen in the water. This becomes life-threatening for them when the level falls below three milligrams of oxygen per liter. In summer 2014, the level was below...
How much is the Atlantic heating up our weather?
The Atlantic is generally considered to be Europe’s “weather kitchen” – bringing heat from the tropics to our coasts, it plays a critical role in predicting the weather. Nevertheless, it usually takes a backseat when it comes to forecasting: though atmospheric processes are closely monitored...
Using sea-level rise to define climate targets
Photo: J. Zapata/unsplash
One major consequence of global warming is the rising sea level. A study conducted at Universität Hamburg’s Cluster of Excellence for climate research CLICCS now shows: if we assume that sea-level rise is the most critical effect of climate change, then it is not only more sensible, but also...
Baltic Sea garfish are in trouble
The garfish has a long, pointed nose and grass-green bones. It is a predatory fish in the Baltic Sea, where it has almost no natural predators itself. If the size of its population changes, it affects other fish and organisms in the food web, e.g. the herring. The ties between predator and prey...
The IPCC confirms it: The time to act is now!
Photo: unsplash - Emma Francis
Coastlines at risk: Higher waves due to climate change
A team of researchers has mapped out how much waves are likely to change around the globe under climate change and found that if we can limit warming to 2 degrees, signals of wave climate change are likely to stay within the range of natural climate variability. The study was just published in...
Taking a closer look at our oceans
Photo: Corinna Harl, www.micori.de
What shape are our oceans in? Which protective measures are sensible? A new computer model promises to help find the best assessment criteria.
According to the targets set by the European Union, by 2020 our oceans are meant to be clean, healthy and productive; a laudable goal. In order to...
How high could the sea level rise?
Photo: Chris Gallagher/Unsplash
The research project “SeaLevel” recently received approval for a second phase of funding, amounting to six million euros, which it will use to improve the accuracy of regional forecasting for future sea-level changes and their consequences for local populaces. The decision was recently...
35 years of marine conservation: the lack of a strategy increases the need for protected areas
Photo: UHH/CEN/K. Jantke
Although more than 16 percent of all national waters are now protected, many ecoregions and countries are not included. The current reserve system is just as expensive as it is inefficient, as Dr. Kerstin Jantke and her team show in a study recently released by Universität Hamburg’s Center for...
The North Sea takes up twice as much CO2 along its coasts as previously thought
We have a powerful ally against climate change: the oceans. The world’s oceans take up a third of the greenhouse gases that humans pump into the atmosphere as a result of industry and traffic, curbing their effect and buffering climate change. But they are paying the price – the oceans are...
The North Sea – portrayed by 300,000 data sets
Rain catchers out at sea
Photo: UHH/C. Klepp
How high can the sea level rise?
Like small blenders in the sea: offshore wind turbines
Sea level and climate change: Conference in New York / research in Hamburg
Ocean salinity explains climate phenomena
Photo: UHH/CEN/T. Wasilewski