Compound Drought and Heatwave (CDHW) Events – Senegal, 1981-2023

Science Case Name Multi-Hazards in Senegal. Dataset Name/Title Compound Drought and Heatwave (CDHW) Events – Senegal, 1981-2023 Dataset Description The dataset contains gridded data on co-ocurrence of droughts and heatwaves (CDHW) over the whole area of Senegal. Key Methodologies Droughts were defined as events with Z-scores of the 6-month Standardized Precipitation Index (SPI-6) below or equal to -1. SPI-6 was computed from Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS) mothly precipitation data. Heatwaves were defined as at least 3-day-long events on which daily maximum air temperature exceeded the above the 90$^{th}$ percentile of the 31-day moving average daily maximum air temperature. Two heatwave events separated by only one day were merged into a single event. Daily maximum air temperature at 2 meters was downloaded from ERA5-Land dataset. CDHW is a spatial and temporal intersection of droughts and heatwaves. The uploaded dataset has values 1 in cell with CDHW and 0 othwerwise. Temporal Domain 1981–2023, daily Spatial Domain Senegal, West Africa Spatial resolution ca 0.1°x0.1° (EPGS:4326) Key Variables/Indicators Spatio-temporal clusters of dry/drought events Data Format netCDF Source Data ERA5-Land and CHIRPS Accessibility Zenodo, https://doi.org/10.5281/zenodo.15211948 Stakeholder Relevance Identifying and assessing past compound hot and dry events for multi-hazard events monitoring, prediction and preparedness. Limitations/Assumptions The assumption is that 43 years of data are sufficient for the SPI computation. Additional Outputs/information The dataset access is currently restricted due to pending related publication. Contact Information Egor Prikaziuk (UT-ITC, Faculty of Geo-Information Science and Earth Observation, ITC, University of Twente, the Netherlands)