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Made available in DSpace on 2022-04-29T08:31:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 Global warming is likely to cause a progressive drought increase in some regions, but how population and natural resources will be affected is still underexplored. This study focuses on global population and land-use (forests, croplands, pastures) exposure to meteorological drought hazard in the 21st century, expressed as frequency and severity of drought events. As input, we use a large ensemble of climate simulations from the Coordinated Regional Climate Downscaling Experiment, population projections from the NASA-SEDAC dataset, and land-use projections from the Land-Use Harmonization 2 project for 1981–2100. The exposure to drought hazard is presented for five SSPs (SSP1-SSP5) at four Global Warming Levels (GWLs, from 1.5 to 4°C). Results show that considering only Standardized Precipitation Index (SPI; based on precipitation), the combination SSP3-GWL4 projects the largest fraction of the global population (14%) to experience an increase in drought frequency and severity (vs. 1981–2010), with this value increasing to 60% if temperature is considered (indirectly included in the Standardized Precipitation-Evapotranspiration Index, SPEI). With SPEI, considering the highest GWL for each SSP, 8 (for SSP2, SSP4, and SSP5) and 11 (SSP3) billion people, that is, more than 90%, will be affected by at least one unprecedented drought. For SSP5 (fossil-fuelled development) at GWL 4°C, approximately 2·106 km2 of forests and croplands (respectively, 6 and 11%) and 1.5·106 km2 of pastures (19%) will be exposed to increased drought frequency and severity according to SPI, but for SPEI, this extent will rise to 17·106 km2 of forests (49%), 6·106 km2 of pastures (78%), and 12·106 km2 of croplands (67%), with mid-latitudes being the most affected areas. The projected likely increase of drought frequency and severity significantly increases population and land-use exposure to drought, even at low GWLs, thus extensive mitigation and adaptation efforts are needed to avoid the most severe impacts of climate change. European Commission Joint Research Centre (JRC) Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC Foundation—REMHI Division) Cooperative Institute for Research in Environmental Sciences (CIRES) and Department of Atmospheric and Oceanic Sciences Snow and Ice Data Center University of Colorado Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) University of Copenhagen Niels Bohr Institute (NBI) Danish Meteorological Institute Abdus Salam International Centre for Theoretical Physics (ICTP) Faculty of Science University of New South Wales Helmholtz-Zentrum Geesthacht (HZG) Institute of Coastal Research The Cyprus Institute (CyI) Climate and Atmosphere Research Center (CARE-C) Climate Service Center Germany (GERICS) Helmholtz-Zentrum Geesthacht Commonwealth Scientific and Industrial Research Organisation (CSIRO) Marine and Atmospheric Research Swedish Meteorological and Hydrological Institute (SMHI) Rossby Centre Département des Sciences de la Terre et de l'Atmosphère Université du Quebec à Montréal (UQAM) University of Cape Town Climate System Analysis Group (CSAG) Department of Physics Faculty of Arts and Sciences Bogazici University Center for Climate Change and Policy Studies Bogazici University Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences (CAS) São Paulo State University and Bauru Meteorological Centre (IPMet/UNESP) Department of Physics Faculty of Arts and Sciences Isik University Institute of Meteorology and Climate Research Karlsruhe Institute of Technology (KIT) Departamento de Ciências Atmosféricas Universidade de São Paulo Facultad de Ciencias Exactas y Naturales Departamento de Ciencias de la Atmósfera y los Océanos (DCAO-FCEN-UBA) Universidad de Buenos Aires Universidad de Buenos Aires Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA) School of Biological Sciences The University of Queensland Department of Earth Sciences and Environment The National University of Malaysia (UKM) National Centre for Scientific Research (CNRS) Institut Pierre-Simon Laplace (IPSL) Laboratoire des Sciences du Climat et de l'Environnement (LSCE) NORCE Norwegian Research Centre AS Centro Italiano Ricerche Aerospaziali (CIRA) São Paulo State University and Bauru Meteorological Centre (IPMet/UNESP)

The JRC PESETA IV study shows that ecosystems, people and economies in the EU will face major impacts from climate change if we do not urgently mitigate greenhouse gas emissions or adapt to climate change. The burden of climate change shows a clear north-south divide, with southern regions in Europe much more impacted, through the effects of extreme heat, water scarcity, drought, forest fires and agriculture losses. Limiting global warming to well below 2°C would considerably reduce climate change impacts in Europe. Adaptation to climate change would further minimize unavoidable impacts in a cost-effective manner, with considerable co-benefits from nature-based solutions., JRC.C.6-Economics of Climate Change, Energy and Transport

This report presents an ecosystem assessment covering the total land area of the EU as well as the EU marine regions. The assessment is carried out by Joint Research Centre, European Environment Agency, DG Environment, and the European Topic Centres on Biological Diversity and on Urban, Land and Soil Systems. This report constitutes a knowledge base which can support the evaluation of the 2020 biodiversity targets. It also provides a data foundation for future assessments and policy developments, in particular with respect to the ecosystem restoration agenda for the next decade (2020-2030). The report presents an analysis of the pressures and condition of terrestrial, freshwater and marine ecosystems using a single, comparable methodology based on European data on trends of pressures and condition relative to the policy baseline 2010. The following main conclusions are drawn: - Pressures on ecosystems exhibit different trends. - Land take, atmospheric emissions of air pollutants and critical loads of nitrogen are decreasing but the absolute values of all these pressures remain too high. - Impacts from climate change on ecosystems are increasing. - Invasive alien species of union concern are observed in all ecosystems, but their impact is particularly high in urban ecosystems and grasslands. - Pressures from overfishing activities and marine pollution are still high. - In the long term, air and freshwater quality is improving. - In forests and agroecosystems, which represent over 80% of the EU territory, there are improvements in structural condition indicators (biomass, deadwood, area under organic farming) relative to the baseline year 2010 but some key bio-indicators such as tree-crown defoliation continue to increase. This indicates that ecosystem condition is not improving. - Species-related indicators show no progress or further declines, particularly in agroecosystems. The analysis of trends in ecosystem services concluded that the current potential of ecosystems to deliver timber, protection against floods, crop pollination, and nature-based recreation is equal to or lower than the baseline value for 2010. At the same time, the demand for these services has significantly increased. A lowered potential in combination with a higher demand risks to further decrease the condition of ecosystems and their contribution to human well-being. Despite the wide coverage of environmental legislation in the EU, there are still large gaps in the legal protection of ecosystems. On land, 76% of the area of terrestrial ecosystems, mainly forests, agroecosystems and urban ecosystems, are excluded from a legal designation under the Bird and Habitat Directives. Freshwater and marine ecosystems are subject to specific protection measures under the Water Framework and Marine Strategy Framework Directives. The condition of ecosystems that are under legal designation is unfavourable. More efforts are needed to bend the curve of biodiversity loss and ecosystem degradation and to put ecosystems on a path to recovery. The progress that is made in certain areas such as pollution reduction, increasing air and water quality, increasing share of organic farming, the expansion of forests, and the efforts to maintain marine fish stocks at sustainable levels show that a persistent implementation of policies can be effective. These successes should encourage us to act now and to put forward an ambitious plan for the restoration of Europe’s ecosystems., JRC.D.3-Land Resources

European forests provide a set of fundamental services that contribute to climate change mitigation and human well-being. At the same time, forests are vulnerable systems because the long life-span of trees limits the possibility of rapid adaptation to drastic environmental changes. Climate-driven disturbances in forests, such as fires, windstorms and insect outbreaks, are expected to rise drastically under global warming. As a result, key forest services, such as carbon sequestration and supply of wood materials, could be seriously affected in the near future. Despite the relevance and urgency of the issue, little is known about the vulnerability of European forests to multiple climate-related hazards and the adaptation benefits of alternative forest management strategies. To fill this knowledge gap we investigated the susceptibility of European forests when exposed to a given natural disturbance under different forest management scenarios. For this purpose, we assessed forest vulnerability by integrating in a data-driven framework satellite observations, national forest inventories, land surface climatic data and records of disturbances over the 2000-2017 period. The integration of these data streams is meant to capture the key drivers of vulnerability and to quantify, for the first time, the vulnerability of European forests to fires, windstorms and insect outbreaks in a systematic and spatially explicit manner. We point out that, the term vulnerability is used in this study to express to what degree a forest ecosystem is affected when exposed to a given disturbance. In order to derive risk estimates, vulnerability estimates should be integrated with hazard and exposure components, according to typical impact assessment frameworks. Results of this analyses show that in average at Europe level forest vulnerability to windstorms appears the disturbance with larger biomass loss both in relative and absolute terms (~38%, ~17 t ha-1) compared to fires (~24%, ~12.5 t ha-1) and insect outbreaks (~21%, ~9 t ha-1). Substantial spatial variations in vulnerability emerge and depict generally higher values in norther and Mediterranean regions. Overall, forest structural properties play a larger control on the vulnerability of European forests to natural disturbances compared to climate and landscape features. However, increases in temperature and changes in precipitation patterns occurred over the last two decades, have contributed substantially to make European forests more vulnerable to natural disturbances. We found that these changes in climate led to a limited increase in vulnerability at Europe for fires and windstorms and to a strong increase for insect outbreaks. However, contrasting regional trends emerging over Europe mask relevant temporal changes in vulnerability occurring at local scale. When analyses of single disturbances are combined together, results show that large part of the European forests are substantially vulnerable to at least one natural disturbance and that many of the areas more vulnerable have been subject to an amplification of vulnerability over the observational period due to changes in climate. Reducing tree age and tree density appear effective forest management strategies to reduce the vulnerability of European forests to climate-driven disturbances. The magnitude of the potential benefits appears strongly dependent on local environmental conditions. Previous assessments of future climate risks to European forests, based on catalogues of disturbances collected at country level, have showed that damage from fires, windstorms and insect outbreaks is likely to increase further in coming decades. Such intensification could offset the impact of land-based strategies aiming to increase the forest carbon sink. However, the country scale approach used in such studies do not allow to explore in detail the underlying physical processes and to elaborate adaptation strategies at appropriate local scales. It is therefore fundamental to elaborate new modelling approaches that address in explicit manner the high spatial and temporal variability of forest disturbances. In this respect, machine learning approaches and the increasing availability of multi-platform satellite observations of land surface in combination with high regional climate model simulations, represent valuable opportunities to appraise the impact of forest disturbances at a spatial and temporal resolution relevant for forest management strategies. This explorative study represents a first step towards such integrated framework., JRC.D.1-Bio-economy

Infrastructure systems are the backbone of modern economies, and critical infrastructure resilience is essential to sustainable development. Natural hazards can affect the electricity supply and result in power outages which can trigger accidents, bring economic activity to a halt and hinder emergency response until electricity supply is restored to critical services. The risk environment facing critical infrastructures is complex and in constant flux. This study attempts to elucidate the vulnerability of critical electric infrastructure to storms. First, we discuss the impact of storms on the power grid and outline how certain characteristics of this type of hazard affect the resilience of the power grid based on forensic analysis. Storms can cause widespread damage to the electricity grid. Wind loading and debris impact are the main causes of storm damage. Tall, slender structures, such as transmission towers, distribution poles and wind turbines are most affected. Transmission and distribution assets can also be damaged by the impact of flying debris. Moreover, freezing rain forms glaze ice which accumulates on power lines and increases their catenary load. The added weight can cause the line to break or distribution poles and transmission towers to collapse. Substations were also found to be affected by storms, particularly by inundation and airborne debris. However, damage from flying debris was less compared to that sustained by transmission and distribution lines. Storms in coastal areas may affect transmission and distribution networks by increasing the amount of saltwater deposits on electrical equipment. Given adequate preparedness, early warning can help expedite recovery by allowing TSOs and DSOs to activate disaster response plans, including surge mechanisms and mutual aid agreements, before the storm hits. Second, we present a methodology to investigate the impact of climate change on the risk posed by storms to critical electric infrastructure. Our approach combines a future projection of the recurrence interval of selected storm scenarios and the assessment of the estimated economic losses incurred by critical infrastructure and those resulting from the disruption of daily economic activity. A case study was conducted to demonstrate the methodology in a large urban area in Western Europe. We derived the projected peak wind gust of the 10-, 50- and 100-year storm scenarios for five time periods. For each recurrence interval, the cost to repair the damage to overhead lines and the economic losses from the interruption of the daily economic activity amount each to about half of the total losses. The proportion of the repair cost increases by approximately 10% for the 50-year and the 100-year storms compared to the 10-year scenario. This increase causes the total expected losses from the 50-year and the 100-year storms to rise as well. The duration of the power outage has a major impact on the estimated losses for all scenarios across all time periods. In this case study, the increase of the duration of the power outage from 3 days to 10 days increases the total expected losses 3.5 times. With longer-term power outages, the economic losses caused by interruption of the daily economic activity progressively become the main determinant of the total impact. The scope of this study is limited to demonstrating the feasibility of the methodology and inductively drawing preliminary conclusions regarding the impact of storms on critical infrastructure given climate change conditions. It is not intended to supplement, replace or challenge existing risk assessment and management plans prepared by Member States. The following recommendations emerged from the findings of this study: — Consider increasing transmission tower design requirements for resistance to wind loading in standards and regulations. — Consider the risk from climate change in investment analyses. — Consider events with recurrence intervals longer than 100 years in hazard mitigation and emergency planning. — Standardize mutual aid resources. — Plan for surge capabilities and external contractors., JRC.E.2-Technology Innovation in Security

Windstorms are amongst the most damaging natural hazards in Europe, with approximately 5 €billion of estimated annual losses in the EU. The number of reported windstorms significantly increased over the last decades, yet there is no consensus about a climate-induced trend in windstorms over Europe. Climate model projections of extreme wind are highly uncertain, but they suggest that windstorms will not become more intense or happen more frequent with global warming over most of the European land. As a consequence, it is expected that risks from windstorms in the EU will not rise due to climate change. Future impacts of wind extremes could be reduced by a range of measures, such as the development and implementation of enhanced windstorm-resilient standards and building codes., JRC.E.1-Disaster Risk Management

With this report, the reader finds an overview of the changes, upgrades and new features created in the European Drought Observatory (EDO) and the Global Drought Observatory (GDO) and made in 2019. The year proved relatively quiet concerning drought events in Europe; the subcontinent was only affected in the Baltics, although fires broke out vigorously in the Balkans, Spain and Russia. Thanks to the recent juvenile concern with regard to the heating up of the climate, drought events and forest fires drew more public-attention. Our reaction upon this concern in the Global Drought Observatory is the development of a new group of data, which we call Drought Mitigation. With more people genuinely concerned in the effect of our alternation of the properties of the lower atmosphere, we take up the task to provide guidelines for repair and adaptation. Higher temperatures imply that air depletes more vapour from vegetation and soil, leading to more intense droughts or floods. Consient management of our fresh water resources and massive tree planting are measures that can have significant impact on the effects of a Drought, Forest Fires or also Flood events. Therefore, we started with including the results of the often-cited research result regarding reforestation potential of the Crowther Lab as a layer in the Global Drought Observatory. We completed our work with enriching data describing dams with data regarding the location, name and quantitative characteristics of dams as an additional layer. We worked on the integration of the GRACE Dataset, which gives us an actualized satellite born, insight in the depletion of groundwater resources. We created a new index, alerting drought impacts on protected wetlands. Droughts events in these areas might affect rare species living in these protected wetlands, thus creating a link to the biodiversity crisis. The drought alerting mechanism we developed thus far were human centred. With this new index and with the Crowther Lab reforestation inventory we hope to correct this one species view of the past, learning to share our territory with all species, also during hard times of a drought disaster. With these additions, we hope that EDO and GDO will give you a better overview of the impacts of drought events, not only for our economy but also for our shared ecosystems and their services to us. Finally note that we engage in a project to export EDO and GDO knowledge and software to African regional partners. Thus enabling them to set up drought observatories in Africa just as if we did for South- and Central America. Such a collaboration works both ways, we understand better the impacts of Drought events in their region and we learn from their practical skills with regard to make things work in a challenging environment, whilst we can give them working drought observatory software, practical manners to, almost, fully automate the filling and updating of the systems combined with our specific expertise on droughts build up in the last 12 years., JRC.E.1-Disaster Risk Management

As a result of climate change in recent past and unsustainable land management, drought became one of the most impacting disasters and, with the projected global warming, it is expected to progressively cause more damages by the end of the 21st century. This study investigates changes in drought occurrence, frequency, and severity in Europe in the next decades. A combined indicator based on the predominance of the drought signal over normal/wet conditions has been used. The indicator, which combines the standardized precipitation index (SPI, which accounts for anomalous low rainfall), the standardized precipitation evapotranspiration index (SPEI, which accounts for high temperatures and scarce precipitations), and the reconnaissance drought indicator (RDI, similar to SPEI but more affected by extreme events), has been computed at 3- and 12-month accumulation scales to characterize trends in seasonal and annual events from 1981 to 2100. Climate data from 11 bias-adjusted high-resolution (0.11°) simulations from the EURO-CORDEX (coordinated regional climate downscaling experiment) have been used in the analyses. For each simulation, the frequency and severity of drought and extreme drought events for 1981–2010, 2041–2070, and 2071–2100 have been analysed. Under the moderate emission scenario (RCP4.5), droughts are projected to become increasingly more frequent and severe in the Mediterranean area, western Europe, and Northern Scandinavia, whereas the whole European continent, with the exception of Iceland, will be affected by more frequent and severe extreme droughts under the most severe emission scenario (RCP8.5), especially after 2070. Seasonally, drought frequency is projected to increase everywhere in Europe for both scenarios in spring and summer, especially over southern Europe, and less intensely in autumn; on the contrary, winter shows a decrease in drought frequency over northern Europe. Fil: Spinoni, Jonathan. European Commission Joint Research Centre; Italia Fil: Vogt, Jürgen V.. European Commission Joint Research Centre; Italia Fil: Naumann, Gustavo. European Commission Joint Research Centre; Italia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Barbosa, Paulo. European Commission Joint Research Centre; Italia Fil: Dosio, Alessandro. European Commission Joint Research Centre; Italia

In the context of global warming, droughts are increasingly threatening our societies. They last for months or even years, affecting wide areas and large numbers of people, with single drought events sometimes causing economic damages for several billion Euros. Besides the economic damages, droughts can compromise ecosystems and threat food security in the most vulnerable countries. To reduce drought impacts, drought risk assessments need to be implemented in order to support policy makers and water managers in developing coping strategies and drought management plans. Due to the wide-ranging direct and indirect, often cascading impacts, drought risk assessments need to include information tailored to specific sectors and oriented to the needs of specific users. Drought risk as defined here is the likelihood to incur damages and economic losses during and after a drought and depends on the interactions between three dimensions: 1) the severity and the probability of occurrence of a certain drought event, 2) the exposed assets and/or people, and 3) their intrinsic vulnerability or capacity to cope with the hazard. The characterization of these dimensions and the representation of their interactions over different socio-economic sectors poses several challenges. This document discusses these challenges and proposes a theoretical framework to assess drought risk at global scale in order to provide policy relevant information. Based on the described conceptual approach, the JRC developed the Global Drought Observatory (GDO) as a first operational dynamic drought risk monitor for the entire globe. The report is structured as follows: Firstly, the causes and characteristics of drought events as well as their link with climate variability and climate change are discussed (chapters 1 and 2). Secondly, the concept of drought risk is presented, including a first approach to map drought risk at global scale as a function of hazard, exposure and vulnerability (chapter 3). This framework is then linked to expected impacts in different economic sectors and the environment, including the discussion of case studies from Argentina, South Africa, Syria and the United States (chapter 4). Finally, a brief introduction to the key aspects of drought risk management and an outlook on future challenges and opportunities are presented in chapters 5 and 6., JRC.E.1-Disaster Risk Management

Observational records from 1950 onwards and climate projections for the 21st century provide evidence that droughts are a recurrent climate feature in large parts of Europe, especially in the Mediterranean, but also in western, south-eastern and central Europe. Trends over the past 60 years show an increasing frequency, duration and intensity of droughts in these regions, while a negative trend has been observed in north-eastern Europe. With a changing climate, this tendency is likely to be reinforced during the 21st century, affecting a wide range of socioeconomic sectors. The report provides a detailed description of the characteristics of drought events (i.e. their frequency, duration, intensity, severity) across Europe, and their evolution over the period 1950 to 2012, as well as projections until the end of the 21st century. A pan-European database of meteorological drought events for the period 1950-2012 and of their related sectorial impacts was built and a framework developed that links drought severity to expected damages under present and future climate., JRC.H.7-Climate Risk Management

Over the past decades, a continuous rise in global air temperatures resulted in significant changes in the global hydrological cycle. Regionally increased frequencies of extreme weather events and changes in the regional extent of drylands resulted in new areas at risk of desertification, a complex process driven by socio-economic and climate-related factors. Although desertification is not confined to drylands, they are the most vulnerable to land degradation processes. To investigate possible changes in climate patterns over the past 60 years, we couple the information obtained from the Köppen-Geiger (KG) climate classification and the FAO aridity index (AI), providing an overview of the most evident global changes in climate regimes from 1951-1980 to 1981-2010 and focussing on the modifications of the extent of drylands. KG and AI indicators have been computed on a 0.5º x0.5º global grid using precipitation data from the Full Data Reanalysis (v6.0) of the Global Precipitation Climatology Centre, and mean temperature and potential evapotranspiration data from the Climate Research Unit of the University of East Anglia (CRUTSv3.20). Both KG and AI show that the arid areas globally increased between 1951-1980 and 1981-2010, but decreased on average in the Americas. North-Eastern Brazil, Southern Argentina, the Sahel, Zambia and Zimbabwe, the Mediterranean area, North-Eastern China and Sub-Himalayan India have been identified as areas with a significant increase of drylands extent. An analysis of the scientific literature gives evidence that most of the areas identified are effectively undergoing desertification, thus confirming the validity of AI and KG to highlight the areas under risk of desertification. We also discuss the global decrease of cold areas, the progressive change from continental to temperate climate in Central Europe, the shift from tundra to continental climate in Alaska, Canada and North-Eastern Russia and the widening of the tropical belt. Fil: Spinoni, Jonathan. Institute for Environment and Sustainability; Italia Fil: Vogt, Jürgen. Institute for Environment and Sustainability; Italia Fil: Naumann, Gustavo. Institute for Environment and Sustainability; Italia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Carrao, Hugo. Institute for Environment and Sustainability; Italia Fil: Barbosa, Paulo. Institute for Environment and Sustainability; Italia

This PhD thesis focuses on the construction of monthly 30-arc-second resolution temperature, precipitation, and solar radiation 1961-90 climatologies for Italy and on the superimposition of the information of the secular anomaly records to these climatologies. The minimum, mean, and maximum temperature climatologies are based on a quality-checked new 1961-90 dataset for Italy that includes 1,493 TM records and 1,138 TN-TX records; they have been obtained by means of a Multiple Linear Regression model, plus local and global improvements and a Geographical Inverse Distance Gaussian Weighting of the residuals. The final monthly average MAE is 0.65 �C for TM, 0.91 �C for TN, 0.81 �C for TX. The precipitation climatologies are based on a quality-checked new 1961-90 dataset for Italy that includes more than 4,000 precipitation totals; they have been obtained by means of a PRISM model. The relative MAE for yearly total precipitation is approximately 10%. Further work is under development in order to improve both the database and the models. Examples of new reconstructed temperature and precipitation secular records for 1851-2010 are shown and the methodology used to obtain a secular record for each grid point is described. The solar radiation climatologies are obtained by means of a solar radiation model based on a quality-checked new dataset for Italy that includes more than 150 sunshine duration records. The solar radiation model is created on the basis of astronomical parameters, shading effects, albedo tables and turbidity Linke?s factor: monthly 1961-90 grids for direct, diffuse, reflected, absorbed, and global radiation are obtained. The final monthly average relative MAE is 4.6%.