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Graph S. Trivikrama Rao, Ph.D.There is scientific consensus that climate change has been contributing to rising surface temperatures, changing weather pattens, and extreme weather events leading to extreme flooding in some regions and persistent drought in other regions. Focusing on the extreme weather events induced by climate change in the third paper, B Walter Robinson b suggests that humanity could face more extreme weather and increasingly devastating impacts (i.e., severe flooding, extended drought) from these events. [Extracted from the article]

This paper investigates how hydrological drought affected suspended sediment yield (SSY) in the Mediterranean Ofanto River basin, southern Italy, and in its five sub-basins from 1951 to 1989. The Standardized Precipitation Evaporation Index over a scale of 12 months (SPEI12) has been used to compute the hydrological drought in the investigated span of time. SPEI12, mean and maximum monthly discharge (Qmean and Qmax), monthly rainfall erosivity, monthly simple daily intensity index and monthly SSY were used to assess the relationships between dry/wet cycles, streamflow and SSY through the Pearson correlation matrix. Qmean and Qmax are significantly correlated with SSY, while SPEI12 and rainfall intensity do not show good correlation with SSY. Furthermore, from the overall analyses it emerges that sediment yield estimations were higher mainly during the wet period following a period of drought or during a drought period. [ABSTRACT FROM AUTHOR]

Catastrophic extreme weather events are destructive, costly, and bring about significant harm and distress. As a consequence of a warming world, extreme weather is only expected to increase in intensity. Unravelling the ways that frontline communities, such as those in the Cook Islands, are experiencing, preparing for, responding to, and recovering from, extreme events over time is vital to document, learn from, and share widely. This paper, drawing from 10 interviews with local Cook Islanders from both urban and remote settings, explores people's perspectives and experiences of, as well as responses to, extreme weather events, with a focus on droughts and cyclones. We found that the immediate devastation of cyclones and the chronic devastation of droughts has impacted participants in diverse ways, most of which take an emotional toll and affect people's abilities to meet household needs. These participant experiences with extreme weather events and the subsequent lessons that have transpired have led to the development of significant local knowledge and traditional coping strategies which enable anticipation, preparation, and adaptation. We highlight the ways that participants draw on cosmology, worldviews, and community resources for different courses of action in response to extreme weather. Tacit knowledge and endogenous spiritual and community resources offer Cook Islanders agency, hope and resilience in the face of climate change into the future. [ABSTRACT FROM AUTHOR]

Despite being the most tangibly impacted by the first-order effects of a warming climate, much of Australia's agricultural regions have remained relatively conservative in their views on climate change and the need for adaptation. This paper aims to understand how the experience of an extreme climate event like the 2017–2020 drought might shift opinions and values on these issues within agricultural communities. Through in-depth interviews with 20 graziers across Northwest NSW during the worst days of the drought, we found that various psychological lock-ins, historical memories of resilience, and local cultural values appeared to be undermining the perception of their vulnerability, while enhancing perceptions of their ability to endure. Such discursive constructions appear to explain why a jarring climatic event like the 2017–2020 drought was failing to produce a noticeable shift in their views. [ABSTRACT FROM AUTHOR]

Swaziland was affected severely by the 2015–16 El Nino drought, which severely affected agriculture and food security. Of special interest to this paper is its impact on irrigated home gardens on the Komati Downstream Development Project. This project was designed to extend irrigated sugar cane onto customary tenured Swazi Nation Land, with a secondary objective to improve food security by enabling farmers to convert some land from rain-fed to irrigated maize and vegetable production. A random questionnaire survey was undertaken on three farmers' associations of the KDDP which have adopted irrigated home gardens, sampling approximately 50 per cent of those eligible. In addition, in-depth interviews were conducted with committee members of the associations. The paper concludes that unlike previous droughts where the gardens enabled farmers to produce food at a time when rain-fed production had collapsed, in the 2015–16 drought, the impact on water supplies was so great that the irrigated gardens also failed, compromising the food security of the farmers and their neighbours. It also appears that a significant number of farmers are beginning to question the long-term viability of their current farm system in the face of what many perceive as long-term changes in the regional climate. [ABSTRACT FROM AUTHOR]

Drought is one of the important and costliest disaster all over the world. With the accelerated progress of climate change, its frequency of occurrence and negative impacts are rapidly increasing. It is crucial to initiate and sustain an early warning system to monitor and predict the possible impacts of future droughts. Recently, with the rise of data driven models, various case studies are conducted by using Machine Learning algorithms instead of using pure statistical approaches. The main goal of this paper is to conduct a drought forecasting study for a weather station located in Marmara Region. For that purpose, firstly, widely used univariate drought index, Standardized Precipitation Index is calculated for Bursa station. Thereafter, both the historical information retrieved from time series data and its wavelet transformation are considered to investigate Nonlinear Auto-Regressive and Nonlinear Auto-Regressive with External Input (NARX) type Neural Network (NN) models. According to a pool of Goodness-of-Fit (GOF) tests, the forecasting performance of the models with various number of hidden neurons are compared. The recent findings of the study showed that considering the data with its wavelet transformation under (NARX-NN) has benefits to increase the capacity of forecasting the drought index. [ABSTRACT FROM AUTHOR]

This paper investigates climate change impacts on the hydrology and water quality of Brazilian semi-arid reservoirs. An integrated approach coupling climate, hydrological and water quality models was proposed. Five general circulation models (GCMs) and two future scenarios (SSP2-4.5 and SSP5-8.5) were used for the projections. The simulations showed that uncertainty in climate forecast significantly impacted hydrological and water quality outputs. Some scenarios revealed a strong decrease in streamflow and storage volume. On the other hand, 40% of multi-GCM projections indicated reservoir eutrophication. The impacts on hydrology and water quality under SSP5-8.5 were more significant than those under SSP2-4.5. The results also indicated that drought events may be prolonged under climate change, principally at the end of the 21st century for SSP5-8.5, and may significantly increase the total phosphorus concentration. This suggests that tropical semi-arid reservoirs could be more vulnerable to eutrophication in scenarios of climate change than those in other regions. [ABSTRACT FROM AUTHOR]

In Australia, recent climate change has resulted in prolonged droughts, massive devastating bushfires, extreme flooding, and more frequent and intense cyclones, all of which affect archaeological and historic heritage. In this paper, we report on new research on rock art at a site called Djarrng in western Arnhem Land, Northern Territory, Australia. Djarrng was heavily impacted by Tropical Cyclone Monica in 2006. We have visited the site sporadically since 1992, most recently in September 2019. We also have photographs taken in 1979 and accessed others taken in 1965 and so are in a position to document change to rock art panels over a 54 year period. We discuss not only change at the site as a result of the cyclone but also more general changes to rock art imagery at Arnhem Land sites in the past two hundred years, as well as lessons learnt from natural disasters that could be important for future rock art conservation. [ABSTRACT FROM AUTHOR]

Projections are that climate change will increase drought risk and intensity globally. Groundwater is critical during drought, but worldwide aquifers are experiencing unrecoverable groundwater declines. California is ideal to explore strategies for managing groundwater for drought resilience. Many areas rely on groundwater, yet multiple basins are in overdraft. Management was historically centered in local water districts, but in 2014, the state passed the Sustainable Groundwater Management Act (SGMA) establishing mandatory groundwater management rules. This paper discusses strategies used prior to and post SGMA to sustainably manage groundwater for drought resilience, and evaluates the effectiveness of these strategies. It highlights two recent approaches that can increase drought resilience under climate change: flood-MAR – using flood flows for both recharge and irrigation; and the development of locally sited groundwater drought reserves that can serve as a buffer during extreme droughts. [ABSTRACT FROM AUTHOR]

Changes in weather pattern caused by climate change generate more frequent extreme rain events as well as droughts. Sustainable urban drainage systems (SuDS) are useful adaptations to this new reality. The paper surveys the use of these systems in other countries in relation to their use in Spain, particularly the Spanish Mediterranean region. There is a future for more detention of floodwaters as well as more use against drought of water which can be treated and reused. [ABSTRACT FROM AUTHOR]

This paper seeks to correct prevailing assumptions about Bangladesh’s susceptibility to floods, tropical cyclones and drought, and the extent to which global warming has already affected the country’s climate. Analysis of 50 years of the country’s climate and hydrological data showed no evidence that rainfall amounts have changed or that floods, tropical cyclones and droughts have increased in frequency or severity. The extent to which global warming might have affected temperatures is made uncertain by the probably greater impact on temperatures at recording stations of widespread changes in land use and the heat-island effect resulting from urban expansion around the stations. The paper reviews both the diversity of environments in Bangladesh’s coastal area exposed to sea-level rise and the possible mitigation methods. Two major conclusions are drawn: that population increase and rapid urbanisation pose more serious immediate problems for development planning in Bangladesh than climate change; and that education at all levels needs to include practical field studies that could provide all students with a better understanding of the country’s diverse and locally complex environments. [ABSTRACT FROM AUTHOR]

This paper explores how the Medieval Climate Anomaly (MCA) may have impacted the city of Sijilmasa, an important trading centre situated in the Tafilalt oasis of southeastern Morocco during the eleventh century CE, as well as some adaptation strategies that may have been employed by the people of the region in response to these changing environmental conditions. Palaeoclimate proxy evidence indicates that the MCA ushered in a period of warmer and drier conditions throughout Morocco, and there are some indications in the archaeological and historical records that this may have caused some substantial disruptions in the Tafilalt oasis during the first half of the eleventh century CE. However, despite the continuation of this arid phase, the region experienced a period of rapid growth and economic development after the Almoravids conquered Sijilmasa in 1055 CE. This florescence during a period of frequent drought events may have been enabled in part by Almoravid efforts to alter the natural course of the region’s principal river, the Oued Ziz, so that it would flow directly through the middle of the Tafilalt oasis and thus make the region more drought-resistant. [ABSTRACT FROM PUBLISHER]

The estimation of drought at certain temporal and spatial scales is useful for research on climate change and global warming. Greece is often affected by droughts, which are widespread spatially and temporally due to the complex topography. Within the Greek territory, various complex microclimates are created, linked with the spatial variances in drought phenomena. In this paper an estimation of drought in the Sperchios River basin was conducted using the Aridity Index (AI). Additionally, a seasonal analysis of drought was performed. Meteorological data from the Hellenic National Meteorological Service (HNMS) were used as inputs for the AI equation. Spatial interpolation of AI for the Sperchios River basin was performed using a kriging method by the application of ArcGIS 9.3. In order to produce required input data, several models (EmPEst, RayMan) and techniques (linear regression, interpolation) were combined. Finally, the meteorological data series were randomly separated into two periods and AI was estimated for these sub-periods, in order to test the effectiveness of the drought index used. The results indicate that the conditions prevailing in the area are humid, mostly affected by increased rainfall occurring in the mountainous section of the basin. Broadly, the humid environment in the upstream of Sperchios River prevents drought occurring in the lowlands of Sperchios River valley. Nevertheless, some differentiation appeared during the summer period, to which special attention needs to be given in order to prevent drought conditions.Editor Z. W. Kundzewicz Associate editor not assigned [ABSTRACT FROM AUTHOR]

The present study investigates the temporal variability in monthly, seasonal and annual rainfall over a drought prone district in India. Long period rainfall data, from 1950 to 2012, were investigated over the district by analysis of anomalies and application of both parametric and non-parametric statistical tests. Decline in annual rainfall is evident in the study area with highest number of below mean rainfall years observed in the recent decade (2000–2009). Only 25% of the annual rainy days span across pre-monsoon, post-monsoon and winter season, reinforcing the high dependence of local communities on monsoonal rainfall for effective crop growth. Against this, a decreasing trend in monsoonal rainfall is noticed over the years. In conclusion, the present paper argues for district level rainfall studies which will provide local stakeholders with the necessary information for better planning and management of rainfall dependent development sectors, thus resulting in reduced overall socio-economic upheaval of rural communities. [ABSTRACT FROM PUBLISHER]

Impacts on water resources produced by climate change can be exacerbated when occurring in regions already presenting low water resources levels and frequent droughts, and subject to imbalances between water demands and available resources. Within Europe, according to existing climate change scenarios, water resources will be severely affected in Spain. However, the detection of those effects is not simple, because the natural variability of the water cycle and the effects of water abstractions on flow discharges complicate the establishment of clear trends. Therefore, there is a need to improve the assessment of climate change impacts by using hydrological simulation models. This paper reviews water resources and their variability in Spain, the recent modelling studies on hydrological effects of climate change, expected impacts on water resources, the implications in river basins and the current policy actions. Editor Z.W. Kundzewicz Citation Estrela, T., Pérez-Martin, M.A., and Vargas, E., 2012. Impacts of climate change on water resources in Spain. Hydrological Sciences Journal, 57 (6), 1154–1167. [ABSTRACT FROM AUTHOR]

This paper assesses the cycles and indices of drought in Iran and prepares general maps of the region, which are affected by droughts with 10‐ and 30‐year reversible periods frequency of 1 and 3 years by utilizing statistical methods. To study the condition of drought, some indices have been applied in Yazd Province over a 48‐year statistical period (1925–2000). Then with regard to existing statistics (1998–2001), the effect of drought on various issues during the most recent drought cycle have been assessed. [ABSTRACT FROM AUTHOR]

This paper shows how vulnerability to natural hazards can be measured and analyzed and how drought vulnerability might relate to new agricultural technologies and land tenure in Mexico. Several authors have suggested that the impacts of drought on agricultural systems are determined as much by the technological, economic, and political characteristics of a region as by the severity of meteorological events. But the literature on natural hazards and cultural ecology lacks both detailed quantitative assessments of drought impacts at the regional scale and empirical measures of vulnerability to drought and climate change. In Mexico, agricultural losses from natural hazards are severe, varying widely between regions and between different farm sectors. This study analyzes the pattern and severity of drought losses in municipios in the states of Sonora and Puebla, using data from the 1970 Mexican agricultural census. These states represent a range of physical conditions, technological and economic resources, and land-ownership structures, and thus permit an examination of how the Green Revolution and land reform affect the relationships between climatic variation and agricultural production. Reported drought losses were severe in many parts of Sonora and Puebla in 1969; some losses can be explained by rainfall deficits, especially in Puebla. Low drought losses in dry regions of Sonora often can be explained by the widespread use of irrigation. In general, technologies like irrigation, fertilizer, and improved seeds are associated with lower rather than higher drought losses in both states. Drought losses also are higher on the communally held ejido lands than on large private farms, supporting previous research documenting the economic and environmental vulnerability of ejido farmers. [ABSTRACT FROM AUTHOR]