scholarly journals Future hydrology and hydrological extremes under climate change in Asian river basins

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sangam Shrestha ◽  
Deg-Hyo Bae ◽  
Panha Hok ◽  
Suwas Ghimire ◽  
Yadu Pokhrel
Keyword(s):  
Climate Change ◽  
Southeast Asia ◽  
River Flow ◽  
Climate Change Impacts ◽  
River Basins ◽  
Global Scale ◽  
Climatic Conditions ◽  
Spatiotemporal Variability ◽  
Climatic Extremes ◽  
The Impact

AbstractThe diverse impacts of anthropogenic climate change in the spatiotemporal distribution of global freshwater are generally addressed through global scale studies, which suffer from uncertainties arising from coarse spatial resolution. Multi-catchment, regional studies provide fine-grained details of these impacts but remain less explored. Here, we present a comprehensive analysis of climate change impacts on the hydrology of 19 river basins from different geographical and climatic conditions in South and Southeast Asia. We find that these two regions will get warmer (1.5 to 7.8 °C) and wetter (− 3.4 to 46.2%) with the expected increment in river flow (− 18.5 to 109%) at the end of the twenty-first century under climate change. An increase in seasonal hydro-climatic extremes in South Asia and the rising intensity of hydro-climatic extremes during only one season in Southeast Asia illustrates high spatiotemporal variability in the impact of climate change and augments the importance of similar studies on a larger scale for broader understanding.

scholarly journals Quantifying the impact of climate change on water resources at the basin scale on five continents – a unified approach

2010 ◽  
Vol 7 (5) ◽  
pp. 7485-7519 ◽  
Author(s):  
M. C. Todd ◽  
R. G. Taylor ◽  
T. Osborne ◽  
D. Kingston ◽  
N. W. Arnell ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
River Flow ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Climate Impacts ◽  
Catchment Scale ◽  
Considerable Uncertainty ◽  
Basin Scale ◽  
The Impact

Abstract. This paper presents an overview of the methods and results of an assessment of climate change impacts on catchment scale water resources, conducted under the QUEST-GSI (Global Scale Impacts) programme. The project method involved running simulations of catchment-scale hydrology using a unified set of past and future climate scenarios, to enable a consistent analysis of the climate impacts around the globe. The results from individual basins are presented in other papers in 2010. Overall, the studies indicate that in most basins the models project substantial changes to river flow, beyond that observed in the historical record, but that in many cases there is considerable uncertainty in the magnitude and sign of the projected changes. The implications of this for adaptation activities are discussed.

scholarly journals SWAT BASED ASSESSMENT AND PREDICTION OF CLIMATE CHANGE AND ITS IMPACT IN THENPENNAI SUB-BASIN OF SOUTH INDIA

2018 ◽  
Vol XLII-5 ◽  
pp. 557-562
Author(s):  
K. Nivedita Priyadarshini ◽  
S. A. Rahaman ◽  
S. Nithesh Nirmal ◽  
R. Jegankumar ◽  
P. Masilamani
Keyword(s):  
Climate Change ◽  
Assessment Tool ◽  
Climate Change Impacts ◽  
Climatic Conditions ◽  
Scale Model ◽  
Impact Of Climate Change ◽  
Temperature And Precipitation ◽  
The Government ◽  
The Impact ◽  
Soil And Water

<p><strong>Abstract.</strong> Climate change impacts on watershed ecosystems and hydrologic processes are complex. The key significant parameters responsible for balancing the watershed ecosystems are temperature and rainfall. Though these parameters are uncertain, they play a prime role in the projections of dimensional climate change studies. The impact of climate change is more dependent on temperature and precipitation which contributes at a larger magnitude for characterising global warming issues. This paper aims to forecast the variations of temperature and precipitation during the period of 2020&amp;ndash;2050 for the northern part of Thenpennar sub basin. This study is modelled using SWAT (Soil and Water Assessment Tool) &amp;ndash; a scale model developed to predict the impact of changes that occurs in land, soil and water over a period of time. This study is validated using the base period from 1980&amp;ndash;2000 which shows the distribution of rainfall and temperature among 38 watersheds. The results from this study show that there is a decrease in the rainfall for a maximum of about 20% in the month of December during the predicted period of 2020 and 2050. This study assesses the possible adverse impact of climate change on temperature and precipitation of Thenpennai sub-basin. This kind of predictions will help the government agencies, rulers and decision makers in policy making and implementing the adaptation strategies for the changing climatic conditions.</p>

scholarly journals Adapting global shared socio-economic pathways for national and local scenarios

2021 ◽  
Author(s):  
B Frame ◽  
Judith Lawrence ◽  
AG Ausseil ◽  
A Reisinger ◽  
A Daigneault
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Local Scale ◽  
Local Context ◽  
Response Options ◽  
Integrative Research ◽  
Climate Change Risks ◽  
The Impact ◽  
Adaptation And Mitigation

© 2018 The Authors Socio-economic scenarios enable us to understand the extent to which global-, national- and local-scale societal developments can influence the nature and severity of climate change risks and response options. Shared socio-economic pathways (SSPs) enable a systematic exploration of the challenges to adaptation and mitigation that alternative futures entail. However, SSPs are primarily defined for the global scale. If countries are to test their adaptation and mitigation options for robustness across plausible future socio-economic conditions, then SSPs require country-relevant detail to understand climate change risks at the national and local scales. New Zealand is used to illustrate how nationally relevant socio-economic scenarios, nested within SSPs can be developed to inform national- and local-scale studies of climate change impacts and their implications. Shared policy assumptions were developed, involving a mix of climate-specific and non-climate-specific policies, to demonstrate how international links and global-scale developments are critical locally—local choices may accelerate, reduce or even negate the impact of global trends for extended periods. The typology was then ‘tested’ by applying it in a local context. The research challenges observed in developing credible, salient and legitimate national-scale socio-economic scenarios include issues in developing scenarios across a multidisciplinary team. Finally, recommendations for adapting shared climate policy assumptions to produce national and local scenarios, and for assessing the feasibility and effectiveness of climate change adaptation options are presented. These include the need for: guidelines to embed national scenarios in global frameworks; a limit the number of plausible futures; inter-operability of models; an ability to work towards effective multi-disciplinary teams and integrative research; and the opportunity to involve participatory processes where feasible.

scholarly journals Uncertainty in climate change impacts on basin-scale freshwater resources – preface to the special issue: the QUEST-GSI methodology and synthesis of results

2011 ◽  
Vol 15 (3) ◽  
pp. 1035-1046 ◽  
Author(s):  
M. C. Todd ◽  
R. G. Taylor ◽  
T. J. Osborn ◽  
D. G. Kingston ◽  
N. W. Arnell ◽  
...  
Keyword(s):  
Climate Change ◽  
River Flow ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Historical Record ◽  
Climate Impacts ◽  
Special Issue ◽  
Catchment Scale ◽  
Considerable Uncertainty ◽  
Basin Scale

Abstract. This paper presents a preface to this Special Issue on the results of the QUEST-GSI (Global Scale Impacts) project on climate change impacts on catchment scale water resources. A detailed description of the unified methodology, subsequently used in all studies in this issue, is provided. The project method involved running simulations of catchment-scale hydrology using a unified set of past and future climate scenarios, to enable a consistent analysis of the climate impacts around the globe. These scenarios include "policy-relevant" prescribed warming scenarios. This is followed by a synthesis of the key findings. Overall, the studies indicate that in most basins the models project substantial changes to river flow, beyond that observed in the historical record, but that in many cases there is considerable uncertainty in the magnitude and sign of the projected changes. The implications of this for adaptation activities are discussed.

Climate Change Impacts and Adaptations: New Challenges for the Wine Industry

2016 ◽  
Vol 11 (1) ◽  
pp. 139-149 ◽  
Author(s):  
Nathalie Ollat ◽  
Jean-Marc Touzard ◽  
Cornelis van Leeuwen
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Climatic Conditions ◽  
Wine Industry ◽  
Adaptation To Climate Change ◽  
Wine Quality ◽  
Wine Production ◽  
Wine Making ◽  
Wide Range ◽  
The Impact

AbstractClimate change will have a profound effect on vine growing worldwide. Wine quality will also be affected, which will raise economic issues. Possible adaptations may result from changes in plant material, viticultural techniques, and the wine-making process. Relocation of vineyards to cooler areas and increased irrigation are other options, but they may result in potential conflicts for land and water use. Grapes are currently grown in many regions around the world, and growers have adapted their practices to the wide range of climatic conditions that can be found among or inside these areas. This knowledge is precious for identifying potential adaptations to climate change. Because climate change affects all activities linked to wine production (grape growing, wine making, wine economics, and environmental issues), multidisciplinary research is needed to guide growers to continue to produce high-quality wines in an economical and environmentally sustainable way. An example of such an interdisciplinary study is the French LACCAVE (long-term adaptation to climate change in viticulture and enology) project, in which researchers from 23 institutes work together on all issues related to the impact of climate change on wine production. (JEL Classifications: Q1, Q5)

scholarly journals Adapting global shared socio-economic pathways for national and local scenarios

2021 ◽  
Author(s):  
B Frame ◽  
Judith Lawrence ◽  
AG Ausseil ◽  
A Reisinger ◽  
A Daigneault
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Local Scale ◽  
Local Context ◽  
Response Options ◽  
Integrative Research ◽  
Climate Change Risks ◽  
The Impact ◽  
Adaptation And Mitigation

© 2018 The Authors Socio-economic scenarios enable us to understand the extent to which global-, national- and local-scale societal developments can influence the nature and severity of climate change risks and response options. Shared socio-economic pathways (SSPs) enable a systematic exploration of the challenges to adaptation and mitigation that alternative futures entail. However, SSPs are primarily defined for the global scale. If countries are to test their adaptation and mitigation options for robustness across plausible future socio-economic conditions, then SSPs require country-relevant detail to understand climate change risks at the national and local scales. New Zealand is used to illustrate how nationally relevant socio-economic scenarios, nested within SSPs can be developed to inform national- and local-scale studies of climate change impacts and their implications. Shared policy assumptions were developed, involving a mix of climate-specific and non-climate-specific policies, to demonstrate how international links and global-scale developments are critical locally—local choices may accelerate, reduce or even negate the impact of global trends for extended periods. The typology was then ‘tested’ by applying it in a local context. The research challenges observed in developing credible, salient and legitimate national-scale socio-economic scenarios include issues in developing scenarios across a multidisciplinary team. Finally, recommendations for adapting shared climate policy assumptions to produce national and local scenarios, and for assessing the feasibility and effectiveness of climate change adaptation options are presented. These include the need for: guidelines to embed national scenarios in global frameworks; a limit the number of plausible futures; inter-operability of models; an ability to work towards effective multi-disciplinary teams and integrative research; and the opportunity to involve participatory processes where feasible.

Assessing the impact of climate change on Southeast Asia’s hydropower availability

2021 ◽  
Author(s):  
Thanh Duc Dang ◽  
Jia Yi Ng ◽  
Stefano Galelli
Keyword(s):  
Climate Change ◽  
Southeast Asia ◽  
Climatic Variability ◽  
Management Strategies ◽  
Coupled Model ◽  
River Basins ◽  
Infiltration Capacity ◽  
Impact Of Climate Change ◽  
Global Circulation Models ◽  
The Impact

&lt;p&gt;Southeast Asia&amp;#8217;s electricity supply largely depends on the hydropower resources of the Mekong, Chao Phraya, Irrawaddy, and Salween River Basins. Uncertain precipitation patterns, rising temperature, and other climate-driven changes are exposing these resources to unprecedented risks, prompting decision makers to re-evaluate existing reservoir management strategies through climate change risk assessments. These assessments are important in shaping the operators&amp;#8217; response to hydro-climatic variability and are necessary to ensure energy security in the region. In this study, we developed high-resolution, semi-distributed hydrological models to examine the potential changes of hydropower availability under projected future climate scenarios in the four largest river basins in South East Asia. Specifically, we relied on a novel variant of the Variable Infiltration Capacity (VIC) model that integrates reservoir operations into the routing scheme, warranting a more accurate representation of cascade reservoir systems. Climate change impacts were derived from the outputs of five Global Circulation Models (GCMs) forced by two Shared Socioeconomic Pathways (SSPs 2.6 and 8.5) emission scenarios in the Coupled Model Intercomparison Project Phase 6 (CMIP6). We find that hydropower generation would be altered significantly in all scenarios in terms of temporal variability and magnitude due to the changes in duration and magnitude of the summer monsoon. Our findings further stress the importance of exploring how the impact of climate change on hydropower availability propagates through water-energy systems and call for adaptive reservoir operation strategies.&lt;/p&gt;

scholarly journals Responses of global waterbird populations to climate change vary with latitude

2019 ◽  
Author(s):  
Tatsuya Amano ◽  
Tamás Székely ◽  
Hannah S. Wauchope ◽  
Brody Sandel ◽  
Szabolcs Nagy ◽  
...  
Keyword(s):  
Climate Change ◽  
Temperature Increase ◽  
Species Abundance ◽  
Empirical Support ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Anthropogenic Factors ◽  
Tropical Species ◽  
Wetland Biodiversity ◽  
The Impact

AbstractWhile climate change continues to present a major threat to global biodiversity and ecosystems, most research on climate change impacts do not have the resolution to detect changes in species abundance and are often limited to temperate ecosystems. This limits our understanding of global responses in species abundance—a determinant of ecosystem function and services—to climate change including in the highly-biodiverse tropics. We address this knowledge gap by quantifying abundance responses to climate change in waterbirds, an indicator taxon of wetland biodiversity, at 6,822 sites between −55° and 64°. Using 1,303,651 count records since 1990 of 390 species, we show that with temperature increase, the abundance of species and populations decreased at lower latitudes, particularly in the tropics, but increased at higher latitudes. These contrasting responses to temperature increase according to latitude indicate potential global-scale poleward shifts of species abundance under climate change, providing empirical support for predictions by earlier studies. The negative responses to temperature increase in tropical species and populations are of conservation concern, as they are often also threatened by other anthropogenic factors. Our results suggest that existing biases in studies towards temperate regions could underestimate the impact of climate change on waterbirds and other species.

scholarly journals A 1-km global dataset of historical (1979–2017) and future (2020–2100) Köppen-Geiger climate classification and bioclimatic variables

2021 ◽  
Author(s):  
Diyang Cui ◽  
Shunlin Liang ◽  
Dongdong Wang ◽  
Zheng Liu
Keyword(s):  
Climate Change ◽  
Regional Scale ◽  
Climate Change Impacts ◽  
Global Scale ◽  
Climatic Conditions ◽  
Distribution Models ◽  
Climate Classification ◽  
Climate Zones ◽  
Bioclimatic Variables

Abstract. The Köppen-Geiger climate classification scheme provides an effective and ecologically meaningful way to characterize climatic conditions and has been widely applied in climate change studies. The Köppen-Geiger climate maps currently available are limited by relatively low spatial resolution, poor accuracy, and noncomparable time periods. Comprehensive assessment of climate change impacts requires a more accurate depiction of fine-grained climatic conditions and continuous long-term time coverage. Here, we present a series of improved 1-km Köppen-Geiger climate classification maps for ten historical periods in 1979–2017 and four future periods in 2020–2099 under RCP2.6, 4.5, 6.0, and 8.5. The historical maps are derived from multiple downscaled observational datasets and the future maps are derived from an ensemble of bias-corrected downscaled CMIP5 projections. In addition to climate classification maps, we calculate 12 bioclimatic variables at 1-km resolution, providing detailed descriptions of annual averages, seasonality, and stressful conditions of climates. The new maps offer higher classification accuracy and demonstrate the ability to capture recent and future projected changes in spatial distributions of climate zones. On regional and continental scales, the new maps show accurate depictions of topographic features and correspond closely with vegetation distributions. We also provide a heuristic application example to detect long-term global-scale area changes of climate zones. This high-resolution dataset of Köppen-Geiger climate classification and bioclimatic variables can be used in conjunction with species distribution models to promote biodiversity conservation and to analyze and identify recent and future interannual or interdecadal changes in climate zones on a global or regional scale. The dataset referred to as KGClim, is publicly available at http://doi.org/10.5281/zenodo.4546140 for historical climate and http://doi.org/10.5281/zenodo.4542076 for future climate.

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