A5084457324- Hydrology and Watershed Management Studies
- Climate variability and models
- Hydrology and Drought Analysis
- Flood Risk Assessment and Management
- Cryospheric studies and observations
- Meteorological Phenomena and Simulations
- Water resources management and optimization
- Geography Education and Pedagogy
- Geophysics and Gravity Measurements
- Hydrological Forecasting Using AI
- Tropical and Extratropical Cyclones Research
- Climate change and permafrost
- Groundwater flow and contamination studies
- Climate change impacts on agriculture
- Oceanographic and Atmospheric Processes
- Wind and Air Flow Studies
- Plant Water Relations and Carbon Dynamics
- Soil Moisture and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Arctic and Antarctic ice dynamics
- Geographic Information Systems Studies
- Educational Assessment and Pedagogy
- Diverse Educational Innovations Studies
- Legal Systems and Judicial Processes
- Climate Change and Environmental Impact
University of Otago
2015-2024
The Ohio State University
2022
University of Birmingham
2005-2012
University of Oslo
2010-2012
University College London
2008-2011
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...
21st century climate change is projected to result in an intensification of the global hydrological cycle, but there substantial uncertainty how this will impact freshwater availability. A relatively overlooked aspect pertains different methods estimating potential evapotranspiration (PET) respond changing climate. Here we investigate response six PET a 2°C rise mean temperature. All suggest increase associated with warming However, differences signal over 100% are found between methods....
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. 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...
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...
Human activities both aggravate and alleviate streamflow drought. Here we show that aggravation is dominant in contrasting cases around the world analysed with a consistent methodology. Our 28 included different combinations of human-water interactions. We found water abstraction aggravated all drought characteristics, increases 20%–305% total time across case studies, deficit up to almost 3000%. Water transfers reduced by 97%. In into catchment or augmenting from groundwater, inputs could...
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. The Mekong River Basin is a key regional resource in Southeast Asia for sectors that include agriculture, fisheries and electricity production. Here we explore the potential impacts of climate change on freshwater resources within river basin. We quantify uncertainty these projections associated with GCM structure sensitivity, as well from hydrological model parameter specification. This achieved by running pattern-scaled scenarios through semi-distributed (SLURP) Pattern-scaling...
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...
Six MIKE SHE models of the Mekong are developed, each employing potential evapotranspiration (PET) derived using alternative methods: Blaney–Criddle (BC), Hamon (HM), Hargreaves–Samani (HS), Linacre (LN), Penman (PN) and Priestley–Taylor (PT). Baseline (1961–1990) PET varies, with PT followed by HS providing lowest totals, LN BC highest. The largest mean annual is over 1.5 times smallest. Independent calibration model results in different optimised parameter sets that mitigate differences...
The new scientific decade (2023-2032) of the International Association Hydrological Sciences (IAHS) aims at searching for sustainable solutions to undesired water conditions - may it be too little, much or polluted. Many current issues originate from global change, while problems must embrace local understanding and context. will explore crises by actionable knowledge within three themes: interactions, innovative cross-cutting methods. We capitalise on previous IAHS Scientific Decades...
This paper evaluates the relationships between atmospheric circulation, climate and streamflow in northern North Atlantic region over last century especially 50 years. Improved understanding of climatic influences on is vital given great importance fluvial processes to natural systems water resources, light recent predicted change. The main focus lies with hydrologic implications major circulation patterns Atlantic, namely Oscillation (NAO) Arctic (AO). studies reviewed here reveal key...
Abstract. The changing availability of freshwater resources is likely to be one the most important consequences projected 21st century climate change for both human and natural systems. However, substantial uncertainty remains regarding precise impacts on water resources, due in part GCM projections change. Here we explore potential a humid, tropical catchment (the River Mitano) Upper Nile Basin Uganda. Uncertainty associated with structure sensitivity explored, as well parameter...
Abstract. This paper presents a preface to this Special Issue on the results of QUEST-GSI (Global Scale Impacts) project climate change impacts catchment scale water resources. A detailed description unified methodology, subsequently used in all studies issue, is provided. The method involved running simulations catchment-scale hydrology using set past and future scenarios, enable consistent analysis around globe. These scenarios include "policy-relevant" prescribed warming scenarios....
Abstract. This paper assesses the hydrological response to scenarios of climate change in Okavango River catchment Southern Africa. Climate are constructed representing different changes global mean temperature from an ensemble 7 models assessed IPCC AR4. The results show a substantial flow associated with warming 2 °C. However, there is considerable uncertainty sign and magnitude projected between models, implying that not appropriate generalised indicator impact. model patterns...
A MIKE SHE model of the Mekong, calibrated and validated for 12 gauging stations, is used to simulate climate change scenarios associated with a 2°C increase in global mean temperature projected by seven general circulation models (GCMs). Impacts each scenario on river ecosystem and, hence, uncertainty different GCMs are assessed through an environmental flow method based range variability approach. Ecologically relevant hydrological indicators evaluated baseline scenario....
Abstract The occurrence of extreme precipitation events in New Zealand regularly results devastating impacts to the local society and environment. An automated atmospheric river (AR) detection technique (ARDT) is applied construct a climatology (1979–2019) midlatitude moisture fluxes conducive precipitation. A distinct seasonality exists AR aligning with seasonal variations jet streams. formation Southern Hemisphere winter split enables persist through all seasons northern regions Zealand,...
Abstract Extremely high precipitation occurs in the Southern Alps of New Zealand, associated with both orographic enhancement and synoptic‐scale weather processes. In this study, we test hypothesis that atmospheric rivers (ARs) are a key driver floods Zealand. Vertically integrated water vapour horizontal transport, circulation, investigated concurrently major on Waitaki River (a South Island river). Analysis largest eight winter maximum between 1979 2012 indicates all ARs. Geopotential...
Abstract The role of atmospheric rivers (ARs) for extreme ablation and snowfall is examined at Brewster Glacier in the Southern Alps, site longest glacier mass balance record New Zealand. By global standards, Zealand strongly impacted by ARs. Here it shown first time (in Zealand) that ARs contribute to thus overall. Vertically integrated water vapor transport (IVT) exceeds 1,600 (800) kg·m −1 ·s largest (snowfall) events, marking these as very strong proximity freezing threshold during...
Abstract. With mountainous topography and exposure to midlatitude westerly storms causing frequent atmospheric river landfall associated hydrohazards, medium-range forecasting of extreme precipitation is imperative for New Zealand. Here, the European Centre Medium-Range Weather Forecasts Extreme Forecast Index (EFI) applied two variables in forecast week 2: total (TP–EFI) vertically integrated water vapour transport (IVT–EFI). Results reveal TP–EFI sometimes outperforms IVT–EFI capturing...
Abstract. As climate change is projected to alter both temperature and precipitation, snow-controlled mid-latitude catchments are expected experience substantial shifts in their seasonal regime, which will have direct implications for water management. In order provide authoritative projections of impacts, the uncertainty inherent all components modelling chain needs be accounted for. This study assesses potential impacts on hydro-climate a headwater sub-catchment New Zealand's largest...
Correlation of monthly inter‐regional river flow and composite analysis large‐scale climatic patterns associated with high low regional are presented for the northern North Atlantic domain 1968–1997. Hydrological regions defined using cluster analysis. Adjacent hydrological generally display year‐round positive correlation flow. For first time, inverse relationships identified between America Europe in autumn, southern from April–May July–December. Composite shows linkages European Icelandic...
Abstract Droughts are high-impact events that have substantial implications for both human and natural systems. As such, improved understanding of the hydroclimatological processes involved in drought development is a major scientific imperative direct practical relevance. To address this research need, paper investigates chain linking antecedent ocean–atmosphere variation to summer streamflow Great Britain. Analyses structured around four distinct regions (defined using hierarchical cluster...