A5050082578- Hydrology and Drought Analysis
- Climate variability and models
- Hydrology and Watershed Management Studies
- Tree-ring climate responses
- Climate change impacts on agriculture
- Plant Water Relations and Carbon Dynamics
- Water resources management and optimization
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Urban Stormwater Management Solutions
- Flood Risk Assessment and Management
- Scientific Computing and Data Management
- Hydrology and Sediment Transport Processes
- Geophysics and Gravity Measurements
- Water-Energy-Food Nexus Studies
- Research Data Management Practices
- Groundwater flow and contamination studies
- Species Distribution and Climate Change
- Fire effects on ecosystems
- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Geology and Paleoclimatology Research
- Smart Materials for Construction
- Atmospheric and Environmental Gas Dynamics
- Pesticide and Herbicide Environmental Studies
The Ohio State University
2019-2025
Utah State University
2017-2019
University of Oslo
2014-2017
Virginia Tech
2013-2017
University of Maryland, College Park
2011-2012
Abstract The Standardized Precipitation Index ( SPI ), a well‐reviewed meteorological drought index recommended by the World Meteorological Organization WMO and its more recent climatic water balance variant, Precipitation‐Evapotranspiration SPEI both rely on selection of univariate probability distribution to normalize index, allowing for comparisons across climates. Choice an improper may impart bias values, exaggerating or minimizing severity. This study compares suite candidate...
Abstract. The summer drought of 2015 affected a large portion continental Europe and was one the most severe droughts in region since 2003. characterized by exceptionally high temperatures many parts central eastern Europe, with daily maximum 2 °C higher than seasonal mean (1971–2000) over western more 3 east. It hottest climatologically driest 1950–2015 study period for an area stretching from Czech Republic to Ukraine. For as whole, it is among six summers 1950. High evapotranspiration...
Abstract. Drought is a natural hazard that can cause wide range of impacts affecting the environment, society, and economy. Providing an impact assessment reducing vulnerability to these for regions beyond local scale, spanning political sectoral boundaries, requires systematic detailed data regarding impacts. This study presents diversity drought across Europe based on European Impact report Inventory (EDII), unique research database has collected close 5000 reports from 33 countries. The...
There is a vital need for research that links meteorological drought indices with impacts felt on the ground. Previously, this link has been estimated based experience or defined very narrow impact measures. This study expands earlier work by showing feasibility of relating user-provided reports indices, Standardized Precipitation Index and Precipitation-Evapotranspiration Index, through logistic regression, while controlling seasonal interannual effects. Analysis includes four types,...
Abstract. In 2015 large parts of Europe were affected by drought. this paper, we analyze the hydrological footprint (dynamic development over space and time) drought in terms both severity (magnitude) spatial extent compare it to extreme 2003. Analyses are based on a range low flow indices derived for about 800 streamflow records across Europe, collected community effort common protocol. We footprints events with meteorological footprints, order learn from similarities differences...
It is generally accepted that drought one of the most costly weather-related natural hazards. In 2015, a long-lasting hit Europe, particularly affecting central and eastern Europe. some regions it was driest (North Slovakia) in others (Czech Republic Poland) second summer last 50 years (following 2003). Key questions are: (i) how extreme are these events, not only terms hydro-meteorological characteristics but also impacts? (ii) impacts managed? Droughts often viewed from climatic...
Abstract. Drought is one of the most costly natural hazards in Europe. Due to its complexity, drought risk, meant as combination hazard and societal vulnerability, difficult define challenging detect predict, impacts are very diverse, covering breadth socioeconomic environmental systems. Pan-European maps risk could inform elaboration guidelines policies address documented severity impact across borders. This work tests capability commonly applied indices vulnerability factors predict annual...
Abstract Recent severe European droughts raise the vital question: are we already experiencing measurable changes in drought likelihood that agree with climate change projections? The plethora of definitions compounds this question, requiring instead ask: how have various types changed, do these compare projections, and what causes observed differences? To our knowledge, study is first to reveal a regional divergence as measured by two most prominent meteorological indices: Standardized...
There is broad interest to improve the reproducibility of published research. We developed a survey tool assess availability digital research artifacts alongside peer-reviewed journal articles (e.g. data, models, code, directions for use) and article results. used 360 1,989 by six hydrology water resources journals in 2017. Like studies from other fields, we reproduced results only small fraction (1.6% tested articles) using their available artifacts. estimated, with 95% confidence, that...
Drought is a worldwide phenomenon that originates from prolonged deficiency in precipitation, often combined with high evaporation, over an extended region. The resultant meteorological water balance may cause hydrological drought to develop into below normal levels of streamflow, lakes, and groundwater. Contemporary knowledge experiences international team experts are consolidated textbook (Tallaksen et al., 2023), which builds on earlier edition (URL 1), however significant new material...
Abstract Quantification of large-scale climate drivers drought is necessary to understand better and manage these spatially extensive often prolonged natural hazards. Here, this issue advanced at the continental scale for Europe. Drought events are identified using two indices—the 6-month cumulative standardized precipitation evapotranspiration indices (SPI-6 SPEI-6, respectively)—both calculated gridded Water Global Change (WATCH) Forcing Dataset 1958–2001. Correlation monthly time series...
Abstract. Numerous drought indices originate from the Standardized Precipitation Index (SPI) and use a moving-average structure to quantify severity by measuring normalized anomalies in hydroclimate variables. This study examines theoretical probability of annual minima based on such process. To accomplish this, we derive stochastic model it simulate 10 ×106 years daily or monthly SPI values order determine distribution exceedance probabilities. We believe this is first explicit...
This response expands on the analysis performed in 'Candidate Distributions for Climatological Drought Indices (SPI and SPEI)' by explaining several topics greater detail testing conclusions of our original article against claims made comment Drs Vicente-Serrano Begueria. Tests using same 11 climate time series confirm findings from Stagge et al. (2015) that Generalized Extreme Value (GEV) distribution produces consistently better fits. Claims GEV exaggerates extreme SPEI values were found...
Abstract Northern latitudes are experiencing faster warming than other regions in the world, which is partly explained by snow albedo feedback. In Norway, mean temperatures have been increasing since 1990s, with 2014 being warmest year on record, 2.2 °C above normal (1961–1990). At same time, a concurrent reduction land area covered has reported. this study, we present detailed spatial and temporal (monthly seasonal) analysis of trends changes indices based high resolution (1 km) gridded...
Abstract. In 2015 large parts of Europe were affected by a drought. two companion papers we summarize collaborative initiative members UNESCO’s EURO FRIEND-Water program to perform timely pan-European assessment the event. this second paper, analyse event relative 2003 based on streamflow observations. Analyses are range low flow and hydrological drought indices for about 800 records across that collected in community effort common protocol. We compare footprints both events with...
Abstract The standardized precipitation index (SPI) measures meteorological drought relative to historical climatology by normalizing accumulated precipitation. Longer record lengths improve parameter estimates, but these longer records may include signals of anthropogenic climate change and multidecadal natural fluctuations. Historically, nonstationarity has either been ignored or incorporated into the SPI using a quasi-stationary reference period, such as WMO 30-yr period. This study...
[1] A daily stochastic streamflow generation model is presented, which successfully replicates statistics of the historical record and can produce climate-adjusted time series. monthly climate relates general circulation (GCM)-scale indicators to discrete climate-streamflow states, in turn control parameters a model. Daily flow generated by two-state (increasing/decreasing) Markov chain, with rising limb increments randomly sampled from Weibull distribution falling modeled as exponential...
Abstract. Drought is a natural hazard that can cause wide range of impacts affecting the environment, society, and economy. Assessing reducing vulnerability to these for regions beyond local scale, spanning political sectoral boundaries, requires systematic detailed data regarding impacts. This study presents an assessment diversity drought across Europe based on European Impact report Inventory (EDII), unique research database has collected close 5000 impact reports from 33 countries. The...
Abstract Correlating tree-ring parameters with daily resolved climate data is becoming increasingly common for understanding the complex relationships between tree growth and surrounding environment. However, an increased number of calculated correlations, there inherent risk spurious significance. In this study, we present analysis using synthetic weather mimicking statistical properties ten real-world sites across Europe to quantify extent which numerous comparisons may inflate maximum...