Drought is an inevitable part of the world’s climate. It occurs in wet as well as in dry regions. Therefore, planning for drought and mitigating its impacts is essential. In this study, a hedging rule is developed using the zero/one mixed integer-programming approach. Furthermore, some procedures are introduced to ease the computational burden inherent in integer programming. Hedging rules are ...

Drought is a meteorological phenomenon that threatens ecosystems, agricultural production, and living conditions. Central Asia highly vulnerable to drought due its special geographic location, water resource shortages, extreme weather conditions, poor management of resources reliance on irrigated agriculture exacerbate the effects drought. In this study, latest version Global Land Data Assimila...

The atmospheric and oceanic causes of North American droughts are examined using observations and ensemble climate simulations. The models indicate that oceanic forcing of annual mean precipitation variability accounts for up to 40% of total variance in northeastern Mexico, the southern Great Plains, and the Gulf Coast states but less than 10% in central and eastern Canada. Observations and mod...

This study examines the change in current 100year hydrological drought frequencies in the Mediterranean in comparison to the 2070s as simulated by the global model WaterGAP. The analysis considers socio-economic and climate changes as indicated by the IPCC scenarios A2 and B2 and the global general circulation model ECHAM4. Under these conditions today’s 100-year drought is estimated to occur 1...

Abstract The use of artificial neural networks as a tool to forecast droughts in Sri Lanka is presented. Predictions were made using the Standardized Precipitation Index (SPI) as the drought monitoring index. Monthly rainfall recorded at 13 climatological stations covering both the wet and dry zones over a long time period have been used as the input to train and test the neural networks. The a...

Historical droughts in Mediterranean regions during the last 500 years: a data/model approach S. Brewer, S. Alleaume, J. Guiot, and A. Nicault CEREGE, CNRS/Université Paul Cézanne UMR 6635, BP 80, 13545 Aix-en-Provence cedex, France Centre d’Etudes Nordiques, Université Laval, Ste Foy, Québec GlK7P4, Canada Received: 31 March 2006 – Accepted: 4 September 2006 – Published: 12 September 2006 Corr...

Abstract Climate change can lead to and intensify drought disasters. Quantifying the vulnerability of disaster-affected elements is significant for understanding mechanisms that transform intensity into eventual loss. This study proposed a growth-stage-based index (GDVI) soybean using meteorological, groundwater, land use, field experiment data crop growth model simulation. The CROPGRO-Soybean ...

Recent Amazonian droughts have drawn attention to the vulnerability of tropical forests to climate perturbations. Satellite and in situ observations have shown an increase in fire occurrence during drought years and tree mortality following severe droughts, but to date there has been no assessment of long-term impacts of these droughts across landscapes in Amazonia. Here, we use satellite micro...

Diatom assemblages preserved in sediment cores from closed-basin lakes can provide high-resolution records of past hydrologic and climatic conditions, including long-term patterns in the intensity, duration, and frequency of droughts. At Moon Lake, a closed-basin lake in eastern North Dakota, a comparison of diatom-inferred salinity and the precipitation-based Bhalme-Mooley Drought Index (BMDI)...