Jul 29, 2016 | Air Pollution, Young Scientists
By Anneke Brand, IIASA science communication intern 2016.
Accidents, lane closures, and congestion all affect the flow of road traffic and harmful emissions from vehicles. Live traffic data allow congestion to be detected more accurately and provide a more precise overview of vehicle emissions at different times and places. In his project for the Young Scientists Summer Program (YSSP), Fabian Heidegger investigates how road traffic affects air pollution in cities, using Vienna and surrounding areas as a case study.
Air pollution is a major problem in Europe and globally. Health impacts of air pollution include a range of respiratory and cardiovascular diseases. “10-20% of Europe’s urban population is exposed to excessive levels of nitrogen dioxide (NO2), along with several other air pollutants. NO2 pollution is highest along busy roads. Technical measures have so far often been circumvented, so cities are looking for other measures to reduce the pollution load. Traffic management has therefore gained interest as a way to reduce air pollution,” says Jens Borken-Kleefeld, Heidegger’s study leader at IIASA.
To calculate the amount of air pollution that cars and other vehicles release into the air, researchers use models that apply various sets of data: traffic networks, where and how far people drive, and emission factors of different vehicle categories. Input data for the model may include how many people live in a certain area, how many of them use cars, where they normally drive, and how many grams of pollutants (such as nitric oxide and NO2 gases) their type of cars emit per kilometer.
Inner city Vienna. © Radub85 | Dreamstime.com
Most of these models rely on average daily traffic data. For Heidegger’s YSSP project, which is related to his PhD work at the University of Natural Resources and Life Sciences in Vienna, he is incorporating real-time data, measured every five minutes, into a traffic simulation model developed by Intelligent Transport Systems Vienna Region. A set of detectors in and around the city record the number and speed of vehicles. In addition, location data from the taxi fleet is incorporated into the traffic simulation. Heidegger can therefore immediately identify adverse traffic conditions like stop-and-go traffic, which has a high impact on emissions. This allows for a more accurate calculation and can help design traffic interventions for improving both traffic flow and air quality.
“In the case of a road closure, local emissions will obviously be lower at the specific road but total emissions for the area could be higher than before when drivers use alternative, longer routes or end up in stop-and-go traffic,” says Heidegger.
In order to understand how these diversions and the displacement of pollutants can affect overall emissions, Heidegger will first determine the emissions per street section, and second, what the effects are of diversions from day-to-day traffic patterns. Together with researchers from the Air Quality and Greenhouse Gases Program at IIASA, Heidegger plans to assess the impact of different intervention scenarios, for example an environmental zone in the city, where only modern cars will be allowed to enter. In a second scenario he will look at the effect of people commuting to Vienna, and a third scenario will explore the consequences of expanding pedestrian zones. The researchers hope that this study will better their understanding of the potential of traffic management to reduce air pollution.
More information
Air Pollution Policy Review 2011-2013
GAINS Model
AIR Program
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.
Jul 15, 2016 | Alumni, Climate, Climate Change, Young Scientists
César Terrer, participant in the IIASA 2016 Young Scientists Summer Program, and PhD student at Imperial College London, recently made a groundbreaking contribution to the way scientists think about climate change and the CO2 fertilization effect. In this interview he discusses his research, his first publication in Science, and his summer project at IIASA.
Conducted and edited by Anneke Brand, IIASA science communication intern 2016.
César Terrer ©Vilma Sandström
How did your scientific career evolve into climate change and ecosystem ecology?
I studied environmental science in Spain and then I went to Australia, where I started working on free-air CO2 enrichment, or FACE experiments. These are very fancy experiments where you fumigate a forest with CO2 to see if the trees grow faster. In 2014 I moved to London for my PhD project. There, instead of focusing on one single FACE experiment, I collected data from all of them. This allowed me to make general conclusions on a global scale rather than a single forest
You recently published a paper in Science magazine. Could you summarize the main findings?
We found that we can predict how much CO2 plants transfer into growth through the CO2 fertilization effect, based on two variables—nitrogen availability and the type of mycorrhizal, or fungal, association that the plants have. The impact of the type of mycorrhizae has never been tested on a global scale—and we found that it is huge. I think it’s fascinating that such tiny organisms play such a big role at a global scale on something as important as the terrestrial capacity of CO2 uptake.
How did you come up with the idea? One random day in the shower?
Long story short, researchers used to think that plants will grow faster, and take up a lot of the CO2 we emit. They assumed this in most of their models as well. But plants need other elements to grow besides CO2. In particular, they need nitrogen. So scientists started to question whether the modeled predictions overestimated the CO2 fertilization effect, because the models did not consider nitrogen limitation. To find out, I analyzed all the FACE experiments and indeed I saw that in general plants were not able to grow faster under elevated CO2 and nitrogen limitation. However, in some cases plants were able to take advantage of elevated CO2 even under nitrogen limitation. I grouped together the experiments where plants could grow under nitrogen limitation and after a lot of reading I saw what they had in common: the type of fungi! It turned out that one type of mycorrhizae is really good at transferring large quantities of nitrogen to the plant and the other type is not.
How did that feel?
Awesome! When I saw the graph, I knew: this is going to be important. Of course, after this, my coauthors helped me to polish the story. Without them, the conclusions would not be as robust and clear.
So how does this process work? Where do the fungi get the nitrogen from?
Particular soils might have a lot of nitrogen, but the amount available for plants to absorb might be low. Also, plants have to compete with non-fungal microorganisms for nitrogen. So if there is not much there, the microorganisms take it all. It’s called immobilization. Instead of mineralizing nitrogen, they immobilize it so that plants cannot take it up, at least not in the short term. Some types of fungi are much more efficient in accessing nitrogen, and associated with roots they allow plants to overcome limitations.
Nitrogen mobilization abilities of different types of fungi. Growth of plants associated with fungi not beneficial for nitrogen uptake (illustrated as grass roots on the left) could be limited by low nitrogen availability in soil. Other plants have the advantage of increased nitrogen uptake due to their beneficial association with certain types of fungi (illustrated as yellow mushrooms connected to the roots of the tree on the right). ©Victor O. Leshyk.
What is the impact of your findings?
Plants currently take up 25-30% of the CO2 we emit, but the question is whether they will be able to continue to do so in the long term. Our findings bring good and bad news. On the one hand, the CO2 fertilization effect will not be limited entirely by nitrogen, because some of the plants will be able to overcome nitrogen limitation through their root fungi. But on the other hand, some plant species will not be able to overcome nitrogen limitation.
There was a big debate about this. One group of scientists believed that plants will continue to take up CO2 and the other group said that plants will be limited by nitrogen availability. These were two very contrasting hypotheses. We discovered that neither of the hypotheses was completely right, but both were partly true, depending on the type of fungi. Our results could bring closure to this debate. We can now make more accurate predictions about global warming.
What will you do at IIASA and how will you link it to your PhD?
I want to upscale and quantify how much carbon plants will take up in the future. If we are to predict the capacity of plants to absorb CO2, we need to quantify mycorrhizal distribution and nitrogen availability on a global scale. We are updating mycorrhizal distribution maps according to distribution of plant species. We know for instance that pines are associated with ectomycorrhizal fungi and always will be. To quantify nitrogen availability we use maps of different soil parameters that are available on a rough global scale.
© Adam Edwards | Dreamstime.com
About César Terrer
Prior to his PhD, Terrer studied at the University of Murcia in Spain and the University of Western Sydney in Australia.
Currently he is a member of the Department of Life Sciences at Imperial College London, UK. For this study he collaborated with researchers from the University of Antwerp, Northern Arizona University, Indiana University and Macquarie University.
In the IIASA Young Scientists Summer Program, Terrer works together with Oskar Franklin from the Ecosystem Services and Management Program and Christina Kaiser from the Evolution and Ecology Program.
Further reading
Note: This article gives the views of the interviewee, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.
Apr 7, 2016 | Environment
By Andrey Krasovskii, IIASA Ecosystems Services and Management Program
By 2090, the area burned by forest fires in the European Union could increase by 200% because of climate change. However, preventive fires could keep that increase to below 50%. Improved firefighting response could provide additional protection against forest fires. These findings were the result of modeling work we did for the EU Mediation project on projecting future burned areas and adaptation options in Europe. When we talk about these results, people often want to know more about how our model works, what assumptions it makes, and how reliable it is.
Figure 1. The WildFire cLimate impacts and Adaptation Model (FLAM) schematic – estimation of expected burned area.
The model is complex: every link in the schematic shown above represents a specific mathematical formula. These formulas have been developed by many researchers who studied how wildfire occurrence is related to climate, population, and biomass available for burning. Their results have been aggregated into mathematical relations and functions attempting to replicate real processes. The model code runs through the scheme with daily weather inputs in order to calculate the potential for fire ignition, spread, and burned areas. The model transforms spatial and intertemporal inputs into expected burned areas for 25km squares across the entirety of Europe. These squares can be summed up into geographic regions, e.g. countries, as well as burned areas can be aggregated over a given time period, e.g. 10 years.
It took days for our colleague Mirco Migliavacca to run the model during his work at the Joint Research Center of the European Commission. In fact, the scheme depicted in Figure 1 shows only a small piece of a larger picture reflecting the Community Land Model with the integrated fire module (CLM-AB), which he used. CLM-AB calculates all inputs in the indicated fire module, based on modeling processes in the global vegetation system. To speed up the running times for the case study focused on the wildfires in Europe, my colleague Nikolay Khabarov developed a standalone version of the fire model by decoupling the fire module from CLM-AB. When I joined the study, we had also found alternatives for input data, e.g. IIASA’s Global Forest Database, and implemented additional procedures in order to create our wildfire climate impacts and adaptation model (FLAM).
We used the historical data from satellite observations in order to validate modeling results. At the beginning many numerical experiments in CLM and FLAM did not give satisfactory results – there was either overestimation or underestimation of modeled burned areas compared to those reported in available datasets. One day a purely mathematical insight happened. We realized that in the fire algorithm implemented in FLAM, there is a parameter that can be factorized, mathematically speaking. This parameter, a probability of extinguishing a fire in a pixel in one day, was constant for Europe and set to 0.5. It became obvious that this parameter should vary with respect to a region. Factorization of this variable gave a possibility to avoid routine calculations, and use it for calibrating the model over a historical period. This can be done analytically by solving a corresponding polynomial equation. Analytical findings allowed us to introduce an effective calibration procedure and at the same time to estimate a firefighting efficiency on a country level. Further, using the advice of our colleagues Anatoly Shvidenko and Dmitry Schepaschenko, we have introduced adaptation options in the model, for example prescribed burnings, which firefighters use to reduce the fuel availability and, consequently, potential of a major fire.
Prescribed burnings are one tool that can help prevent major wildfires. (cc) US Bureau of Land Management via Flickr
Once we had calibrated the model so that it adequately performed on the historical period (using historical climate data), we used climate scenarios to produce future projections. Currently, we are working on further improvements in modeling accuracy in annual burned areas by introducing additional regionally specific factors in the model. In the recent study published in the International Journal of Wildland Fire, we suggested improving the original model by modifying the fire probability function reflecting fuel moisture. This modification allows for a dramatic improvement of accuracy in modelled burned areas for a range of European countries.
Despite some success in modeling annual burned areas in Europe, we still have difficulties in predicting the extreme fires, in particular in some more arid and hence vulnerable regions such as Spain. However, we accept the challenge, because credible modeling results in terms of burned areas provide important information for assessing economic damages and CO2 emissions, due to climate and human activities. Our research has the potential to help society to realize these risks and undertake preventive measures. It also delivers an additional scientific value due to the fact, that fire risks must be included in forest management models.
I would like to thank all the study co-authors for their valuable contributions and efficient collaboration.
Reference
Krasovskii, A., Khabarov, N., Migliavacca, M., Kraxner, F. and Obersteiner, M. (2016) Regional aspects of modelling burned areas in Europe. International Journal of Wildland Fire. http://dx.doi.org/10.1071/WF15012
Note: This article gives the views of the interviewee, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.
Mar 7, 2016 | Poverty & Equity
Shalini Randeria, a sociologist and social anthropologist focused on legal pluralism and global inequalities, is the Rector of the Institute for Human Sciences (IWM) in Vienna and an IIASA Distinguished Visiting Fellow. On 9 March, she gave a keynote lecture in Vienna entitled, “Precarious livelihoods, disposable lives, and struggles for citizenship rights,” as part of the IIASA-Austrian Academy of Sciences public event, Human Capital, Geopolitical Complexities, and our Sustainable Future.
Q. Why do you say that globalization is full of contradictions?
A. We are living in paradoxical times. The global spread of democracy has gone hand in hand with the erosion of its substance. Decisions once made by national parliaments are now made by supranational institutions, reducing the say of citizens in public decision-making. As people feel disenfranchised, trust in our governments fades. Sometimes going to court seems to be the only way to make governments accountable to citizens. This development not only expands the power of the judiciary but also politicizes it.
What role does globalization play in the inequality between Global North and Global South?
Neo-liberal economic restructuring has increased inequalities between countries but also within each society. We are witness today to an unprecedented concentration of income and wealth, which is not an unforeseen consequence of economic globalization but the result of deliberate public policies. The global South, however, is no longer a geographical category. Greece is an example of European country dependent on international finance institutions in much the same way that once so-called developing countries were.
Shalini Randeria © IWM / Dejan Petrovic.
You say that economic and political processes render some lives disposable – what do you mean by that?
Take India for instance: since the country’s independence in 1947, every year some 500,000 people—mostly small farmers, agricultural workers, fishing and forest-dwelling communities —have been forcibly displaced to make room for gigantic infrastructure projects. They have become development refugees in their own country. These people are regarded as ‘dispensable’ by the state in the sense that their livelihoods are destroyed, their lives disrupted, and they are denied access to common property resources. These populations are the human waste that is sacrificed at the altar of an unsustainable model of incessant economic growth.
The Sustainable Development Goals (SDGs), adopted last year, include aims to end poverty, ensure access to employment, energy, water, and reduce inequality, at the same time as preserving the environment. What challenges do you see for achieving these goals?
The SDGs will prove to be an important milestone, if they are implemented the world over. Some of these goals are in conflict with one another. Take the protection of biodiversity, for example, which is often constructed as an antagonistic relationship between society and nature In the new global regime of biodiversity consveration, nature is portrayed as self-regulating, as a pristine, uninhabited wilderness that is threatened due to the wasteful resource use by local populations. Thus access and traditional usufruct rights are curtailed, and indigenous knowledge is devalued and marginalized. The (post)colonial transformation of landscapes into “environment,” “natural resources,” and “biodiversity” has enclosed the commons in most regions of the global South and often commercialized them.
The idea of the Global Commons as spaces and resources that all have access to and also have the responsibility to protect is a useful one in this context. The oceans are but one example of the global commons that include water, forests, or air, which are all being increasingly privatized. The Global Commons also include common resources developed by humans such as virtual data, knowledge, computer software, and medication..
What needs to be done by international institutions to make significant progress in achieving the SDGs?
Eliminating poverty will need an understanding of it that goes beyond a merely economic one. One will need to take into account possibilities of democratic participation, access to public goods and infrastructure, as well as civil rights and a restoration of a plurality of livelihoods. But these institutions also need to be reformed as they have a serious democracy deficit, be it the EU or the Bretton Woods institutions. Unaccountability of international institutions and powerful corporations along with stark asymmetries of power between these and the nation-states characterizes the new architecture of global governance, which need to be remedied urgently if we are to realize global justice.
Note: This article gives the views of the interviewee, and not the position of the Nexus blog, nor of the International Institute for Applied Systems Analysis.
Sep 9, 2015 | Alumni
Jesse Ausubel is director of the Rockefeller University Program for the Human Environment. He was a participant in one of the first classes of IIASA’s Young Scientists Summer Program (YSSP).
Please tell us about your current job – what is your major area of focus?
I do research and manage research. My research primarily concerns sparing natural resources through changes in technology and consumer behavior. The main projects I help manage are the Deep Carbon Observatory (concerned with the origins of life and hydrocarbons) and the International Quiet Ocean Experiment (aiming to achieve a better soundscape of the oceans, including human additions of noise).
In your recent paper, Nature Rebounds, you present a hopeful view of environmental change which contrasts with many other views of the future. What makes you think your view is possible?
The paper looks objectively at the peaking of demand for many natural resources that has occurred in the USA and elsewhere since about 1990. Demand for water, energy, land, and minerals is softening, while demand for information continues to soar. Fortunately, information brings precision in production and consumption and spares other resources. The result is, for example, huge regrowth of forests. The global greening, or net growth of the terrestrial biosphere, allows re-wilding. Ecological restoration inspires many people, although learning again to live in proximity to bears and wolves is not simple.
The American bald eagle population has recovered from endangered status. Photo: US Fish and Wildlife
What would be the key changes humanity would need to make for this vision to come true at a global scale?
Most of what happens is not because humanity consciously and deliberately strategizes and makes changes. The role of policy is vastly exaggerated. French intellectual Bertrand de Jouvenel wrote in his profound 1945 book, Du Pouvoir, “politics is the last repository of hope. “ High tech tycoons Steve Jobs (Apple) and Jeff Bezos (Amazon) popularized tablets and e-readers and did more, together with the innovators in e-mail, to spare forests than all the forest activists and UN targets. Good systems analysts find high leverage for sound directions like decoupling and recycling. Simply observing well, describing the world as it is, matters greatly and demands tremendous skill and dedication.
Ausubel wears the ribbon of the International Cosmos Prize, which he shared with other leaders of the Census of Marine Life program. Photo courtesy Jesse Ausubel
Please tell us about your YSSP work at IIASA? What were your questions, and what did you find?
I participated in the 1979 YSSP, the second class. IIASA’s energy group had developed scenarios of how human activities might change climate. My task was to explore impacts of climate and adaptations. The 1980 book Climatic Constraints and Human Activities summarizes much of what we learned. Most of the book still reads well. Following climate today, I am reminded of the remark, “Everything has been said, but not everyone has had a chance to say it.”
How did the YSSP influence your career?
My YSSP summer encouraged a big drop in my disciplinary and national prejudices. My chief, Soviet hydrodynamicist Oleg Vasiliev, had great intellectual integrity. We had a wonderful rapport and in fact in July I sent him best wishes for his 90th birthday. Oleg invited me to stay in Laxenburg for two more years, which opened more avenues, most importantly collaborations with Cesare Marchetti, Nebojsa Nakicenovic, and Arnulf Gruebler which continue today. The YSSP class itself was lively and talented; John Birge, for example, has had a great career in operations research. Finally, IIASA showed me the value of scientific cooperation between nations in conflict, and I have actively supported such cooperation ever since.
Reference
Ausubel, Jesse H. 2015. “Nature Rebounds.” Long Now Foundation Seminar, San Francisco, 13 January 2015. http://phe.rockefeller.edu/docs/Nature_Rebounds.pdf.
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.
