level rise is one of the most challenging impacts of climate change. The
continued rise in sea levels, partially caused by the melting of the ice sheets
of Greenland and Antarctica, will result in large scale impacts in coastal
areas as they are submerged by the sea. Locations not able to bear the costs of
implementing protection and adaptation measures will have to be abandoned,
resulting in social, economic and environmental losses.
most important mitigation goal for sea level rise is to reduce or possibly
revert carbon dioxide (CO2) emissions. Given the time lag between
emission reductions and the impacts of climate change, new adaptation measures
to reduce sea level rise should be proposed, developed and if possible,
A proposal that I developed during my D.Phil degree ten years ago, which resulted in a paper on the Mitigation and Adaptation to Global Change Journal1, shows that submerged barriers in front of ice sheets and glaciers would contribute to reducing the ice melt in Greenland. Edward Byers and I propose the construction of ten barriers at key glaciers in Greenland to stop the flow of warm salty ocean water reaching glaciers in Greenland and Atlantic, which are the main contributors to ice melting. This could reduce sea level rise by up to 5.3 meters at a levelized cost of US$275 million a year. The cost of the barriers is only a fraction of the estimated costs of adaptation measures to sea level rise around the world estimated to be US$1.4 trillion a year by 21002.
barrier consists of several plain sheet modules of marine grade steel around
200 mm thick connected to cylindrical steel tubes with air inside to keep the
barrier floating. The depth of the barriers varies from 30 – 500 meters and the
required length to stop the sea water from entering the fjords, where the
glaciers are located. As no such barrier has been developed before,
we propose three main
steps for the construction of the barrier:
The barrier components
should be transported to the designated location during the summer, when there
is no ocean ice cover and the access to the location of the barrier is less
challenging. Also during the summer, mooring structures should be added.
During the winter, the
barrier is assembled over the frozen ice cover.
During the next summer,
the ice cover will melt again and the barrier will float above the place where
it is should be fixed. The mooring chains attached to the barrier will pull the
barrier into place, using the mooring structures in the ground.
The concept of reducing the contact of seawater and glaciers to reduce ice sheet melting was first published by Moore in Nature3, and Wolovick in The Cryosphere4 with the construction of submerged dams. A graphic representation of the concept is presented in Figure 1. As you can see the barriers should be positioned just after the glacier cavity, where the depth required for the barrier would be the smallest. Our cost analysis shows that using submerged barriers would have one or two orders of magnitude lower costs when compared to submerged dams. Additionally, submerged barriers could be easily removed, if the need arise.
are several issues involving the implementation of these barriers that should
be considered before they are built. The reduction of ice melt in Greenland
glaciers will contribute to an increase in seawater temperature and salinity of
the Arctic Ocean, which will have a direct impact on the region’s biosphere,
climate and ocean currents. The superficial ice cover in the Arctic will be
considerably reduced. This would allow a new maritime route for ships to cross
the Arctic Ocean, increase the absorption of CO2 by the Arctic Ocean,
due to the increase in the ice free surface area and the cold seawater temperature,
and the increase in radiation heat from the Arctic Ocean into space. Ice is a
strong thermal insulator. Without the Arctic Ocean ice cover the temperature of
the region and the heat radiated from the Earth to space will considerably
increase, which could have a higher impact in cooling the Earth than the ice
cover’s albedo effect. Thus, the reduction of the Arctic Ocean ice cover could
contribute to reducing the overall CO2 concentration of the
atmosphere and reducing the Earth’s temperature.
solution, however, should not be used as an excuse to reduce focus on cutting
CO2 emission. If the world continues to warm, not even submerged
barriers in front of glaciers would be able to stop ice sheets melting and sea
Hunt J, Byers E (2018) Reducing sea level rise with submerged barriers and dams in Greenland. Mitigation and Adaptation Strategies for Global Change DOI: 10.1007/s11027-018-9831-y. [pure.iiasa.ac.at/15649]
Jevrejeva JS, Jackson LP, Grinsted A, Lincke D, and Marzeion B (2018) Flood damage costs under the sea level rise with warming of 1.5 ◦C and 2 ◦C. Environmental Research Letters DOI: 10.1088/1748-9326/aacc76
Moore J, Gladstone R, Zwinger T, and Wolovick M (2018) Geoengineer polar glaciers to slow sea-level rise. Nature: /
Wolovick M, Moore J (2018) Stopping the flood: could we use targeted geoengineering to mitigate sea level rise? The Cryosphere DOI: 10.5194/tc-12-2955-2018
By Hannu Halinen, special advisor to the director general and CEO of IIASA
The Harpa Center at Reykjavik Harbor is the scene for one of the biggest annual gatherings of Arctic researchers, politicians, business representatives, indigenous peoples, nongovernmental organizations, and students; the Arctic Circle Assembly. Under the roof of this architectural landmark some two thousand participants spend a long weekend discussing a multitude of Arctic issues. This year there was an added attraction next door to the Harpa Centre: Finland, as a part of her 100 year independence celebration, had brought the multipurpose ice breaker “Nordica” to Reykjavik. A number of the assembly events were held on board the vessel, and everybody—both assembly participants and Icelanders— wanted to take the rare chance to see this impressive ship. The sea around Iceland is ice-free thanks to the Gulf Stream; hence no need for ice breakers.
The official assembly program consisted of a few high-level plenary sessions and many parallel break-out sessions. IIASA and the Arctic Futures Initiative (AFI) were introduced at the assembly in 2015, and I was busy at that time introducing Pavel and Anni to my Arctic colleagues. I can safely say that the time then was effectively used to build and strengthen the network between IIASA and Arctic actors.
By 2017 we were many steps ahead, as AFI has become a well-known Arctic endeavor and launching the collaboration between IIASA and the Arctic Circle was a major development. I have had the privilege to be associated with AFI over three years now, and one of the challenges for me all along has been to explain to those interested what AFI is about. Because my background is as a diplomat and a civil servant, the concept of a research project has been something new to me—and to many other decision makers and business leaders as well.
Everybody is asking what new angle can the AFI bring, and what’s in it for me? The collaboration between the Arctic Circle and AFI is a prime example on how to respond to the question. A wealth of insights and information is provided in hundreds of interventions at the assembly. What is missing is the analysis, follow up and possible implementation of the inputs during the Assembly. Here AFI can give the crucial assistance needed through systems thinking, models, and scenarios.
Two years ago we had one break-out session at the assembly. This year AFI was presented by Pavel and the former President of Iceland Olafur Grimsson at a plenary, as well as in three well-attended break-out sessions covering how systems analysis perspective can be invaluable to the challenges and opportunities that the Arctic faces; how the opening of the Northern sea route might impact global trade, and Arctic fisheries assessments.
The network is now largely built, the project development phase is coming to the end, and the focus of the work is shifting to carry out the project itself. But many issues still need to be tackled: who will organize and carry out the work, for example, how to solve the funding issues, and so on. I have believed in this project from the beginning. With wise and decisive action the remaining questions can be solved.
Note: This article gives the views of the author, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.
As climate change warms up the planet, it is the Arctic where the effects are most pronounced. According to scientific reports, the Arctic is warming twice as fast in comparison to the rest of the world. That in itself is a cause for concern. However, as the region increasingly becomes ice-free in summer, making shipping and other activities possible, another threat looms large. That of an oil spill.
While it can never be good news, an oil spill in the Arctic could be particularly dangerous because of its sensitive ecosystem and harsh climatic conditions, which make a cleanup next to impossible. With an increase in maritime traffic and an interest in the untapped petroleum reserves of the Arctic, the likelihood of an oil spill increases significantly.
Maisa Nevalainen, as part of the 2017 Young Scientists Summer Program (YSSP), is working to assess the extent of the risk posed by oil spills in the Arctic marine areas.
“That the Arctic is perhaps the last place on the planet which hasn’t yet been destroyed or changed drastically due to human activity, should be reason enough to tread with utmost caution,” says Nevalainen
Although the controversial 1989 Exxon Valdez spill in Prince William Sound was quite close to the Arctic Circle, so far no major spills have occurred in the region. However, that also means that there is no data and little to no understanding of the uncertainties related to such accidents in the region.
For instance, one of the significant impacts of an oil spill would be on the varied marine species living in the region, likely with consequences carrying far in to the future. Because of the cold and ice, oil decomposes very slowly in the region, so an accident involving oil spill would mean that the oil could remain in the ice for decades to come.
Yet, researchers don’t know how vulnerable Arctic species would be to a spill, and which species would be affected more than others. Nevalainen, as part of her study at IIASA will come up with an index-based approach for estimating the vulnerability (an animal’s probability of coming into contact with oil) and sensitivity (probability of dying because of oiling) of key Arctic functional groups of similar species in the face of an oil spill.
“The way a species uses ice will affect what will happen to them if an oil spill were to happen,” says Nevalainen. Moreover, oil tends to concentrate in the openings in ice and this is where many species like to live, she adds.
During the summer season, some islands in the region become breeding grounds for birds and other marine species both from within the Arctic and those that travel thousands of miles from other parts of the world. If these species or their young are exposed to an oil spill, then it could not only result in large-scale deaths but also affect the reproductive capabilities of those that survive. This could translate in to a sizeable impact on the world population of the affected species. Polar bears, for example, have, on an average two cubs every three years. This is a very low fertility rate – so, even if one polar bear is killed, the loss can be significant for the total population. Fish on the other hand are very efficient and lay eggs year round. Even if all their eggs at a particular time were destroyed, it would most likely not affect their overall population. However, if their breeding ground is destroyed then it can have a major impact on the total population depending on their ability and willingness to relocate to a new area to lay eggs, explains Nevalainen.
Due to lack of sufficient data on the number of species in the region as well as that on migratory population, it is difficult to predict future scenarios in case of an accident, she adds. “Depending on the extent of the spill and the ecosystem in the nearing areas, a spill can lead to anything from an unfortunate incident to a terrible disaster,” says Nevalainen.
It might even affect the food chain, at a local or global level. “If oil sinks to the seafloor, some species run the risk of dying or migrating due to destroyed habitat – an example being walruses as they merely dive to get food from the sea floor,” adds Nevalainen. As the walrus is a key species in the food web, this has a high probability of upsetting the food chain.
When the final results of her study come through, Nevalainen aims to compare different regions of the Arctic and the probability of damage in these areas, as well as potential solutions to protect the ecosystem. This would include several factors. One of them could be breeding patterns – spring, for instance, is when certain areas need to be cordoned off for shipping activities, as most animals breed during this time.
“At the moment there are no mechanisms to deal with an oil spill in the Arctics. I hope that it never happens. The Arctic ecosystem is very delicate and it won’t take too much to disturb it, and the consequences can be huge, globally,” warns Nevalainen.
About the Researcher
Maisa Nevalainen is a third- year PhD student at the University of Helsinki, Finland. Her main focus is on environmental impacts caused by Arctic oil spills, while her main research interests include marine environment, and environmental impacts of oil spills among others. Nevalainen is working with the Arctic Futures Initiative at IIASA over the summer, with Professor Brian Fath as her supervisor and Mia Landauer and Wei Liu as her co-supervisors.
This article gives the views of the author, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.
This could have been the title of my application to the first Citizen Artist Incubator (CAI) hosted at IIASA September 4-30, 2016. I am a Canadian playwright and research artist based outside of New York City, whose work deeply engages with climate change. For me, IIASA was the ultimate dating pool.
Playrwright Chantal Bilodeau is working on a series of plays about the impact of climate change on the eight countries of the Arctic. Photo courtesy Chantal Bilodeau
My belief in art/science romance was further reinforced when IIASA Director General and CEO Professor Dr. Pavel Kabat told us – thirteen artists from Europe, the Middle-East, Africa and America – during one of our sessions, “You have a big responsibility, my friends.” He was referring to the need for artists to engage with pressing global issues, and help change negative narratives into positive narratives of opportunity and social innovation. Big responsibility, indeed. And all the more reason for artists and scientists to become bedfellows.
I came to IIASA to do research for a play about human and animal migration, set in Alaska. The play is part of a long-term project titled The Arctic Cycle. A series of eight plays that look at the social and environmental changes taking place in the eight countries of the Arctic, The Arctic Cycle seeks to 1) bring attention to the changes happening in the Arctic and the impact those changes are having on local communities; 2) encourage international and multidisciplinary collaboration across Arctic countries, and; 3) translate scientific data into personal stories.
Sila was the first of the eight plays in the Arctic Cycle. it focuses on Canada. Credit: A.R. Sinclair Photography
I wanted to talk to scientists to get information for my play, but also to explore what might be possible. How can we join forces? How can my talent and skills and sphere of influence be combined with yours to create greater impact? I reached out to people in the Arctic Futures Initiative, the World Population program, and the Evolution and Ecology program. In addition to pointed questions about migration I asked questions like: “If there was one thing you would like people to understand about your field that I could communicate through my work, what would it be?” “Are there situations where having an artist’s perspective in addition to a scientist’s perspective would be useful?”
Everyone was extremely generous with their time and graciously answered my questions. I was pleased to find out there is genuine interest in investigating where art and science might intersect. The most obvious intersection, of course, is in “translating” scientific information into works of art that are then presented in traditional venues. But what about other intersections? Could artists facilitate conversations between scientists and stakeholders? Could a play (as I experienced once before) set the tone for an entire conference? What would be the value of having an artist embedded into a scientific program? Or a field trip?
Thanks to Gloria Benedikt, Merlijn Twaalfhoven, and their partners who invited me to participate in CAI, I came away from IIASA with concrete and up-to-date information for my play, and ideas for activities and programs that could bring art and science closer together around issues of climate change. I also left with a few email addresses and phone numbers. I am hoping this may be the beginning of a courtship that will lead to long and meaningful relationships.
It is that time of the year again – in late summer and early fall the media is covering the Arctic sea ice extent. Whether it is another record-breaking low like 2005, 2007, or 2012, or in second place, like this year (see for example New York Times, Guardian), the news is not good.
The minimum Arctic sea ice extent this year tied for second-lowest. Credit: National Snow and Ice Data Center
And again, we hear many speculations on when we will start to experience an ice-free Arctic Ocean during summertime. Will it be 2030, 2050?
Are we stuck in keeping track and recording, observing the change, how fast or slow it is from year to another? Or is something different this year?
I believe that yes, there is a bit of a difference – and a bit more hope. We are in the post-Paris climate agreement (COP21) and UN Sustainable Development Goals (SDG) world.
Today, 48% of 196 nations have formally bound their governments to the Paris agreement, and it is anticipated that by the end of the year, the required 55 nations responsible for 55% of emissions globally will have formally committed to the Paris agreement. This is when the agreement takes legal force, although implementation is another issue and a new story.
I attend scientific meetings, and meetings gathering science, policy, and business stakeholders. Way too often when I attend those meetings, the participants again state that we must do this and we must do that, but they are not prepared to give concrete help and concrete suggestions. They do not talk about the possibility to commit themselves to anything other than stating the need or supervising the statement of needs, leaving the planning of implementation and search for resources happily to some unnamed others.
The Arctic today is in the spotlight not just in the sense that the world’s attention is briefly focused there: it is melting fast under the effect of a variety of physical forces that concentrate warming in the Arctic region. What could we do to help cool the Arctic more quickly?
Melting sea ice in the Arctic, during a 2011 research cruise. Credit: NASA Goddard Space Flight Center
Reducing greenhouse gas emissions through agreements and voluntary implementation by nations, ramping up the use of renewable energy sources and developing new technology, and then waiting for greenhouse gases to decrease in the atmosphere–this will all take a long time. And it will be much longer before we experience the impacts of the emissions reductions. But in parallel to these slow but indispensable developments, there are faster ways of helping out the Arctic in particular. And as a co-benefit, we can clean the air, improve our health, helping the rest of the world as well.
About 25% of the current warming of the Arctic is attributed to black carbon, that is, soot coming from incomplete combustion of fossil fuels.
The main culprit for the man-made black carbon in the Arctic surface atmosphere is gas flaring, wasteful burning of gas in the oil and gas industry. Gas flaring has been found to contribute to 42% of the annual mean black carbon surface concentrations in the Arctic, hence dominating the black carbon emissions north of 66oN.
A large part of the warming experienced in the Arctic is due to black carbon emissions from the eight Arctic nations and the region north of approximately 40oN, including European Union, Russia, Ukraine, China, Canada, and part of the USA.
The USA and Canada have agreed to end routine gas flaring by 2030. My hope is that the IIASA Arctic Futures Initiative could get together science, policy and business stakeholders from the Arctic nations in order to tackle this problem, with other concerned parties, and with countries not yet involved in discussions.
Reference Stohl, A., Aamaas, B., Amann, M., et. al. (2015). Evaluating the climate and air quality impacts of short-lived pollutants, Atmos. Chem. Phys., 15, 10529-10566, doi:10.5194/acp-15-10529-2015, 2015.
Note: This article gives the views of the author, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.