Abstract
Drought is considered among the most perilous events with catastrophic consequences, particularly from the agro-economic point of view. These consequences are expected to exacerbate under the increasing meteorological aberrations due to changing climate, which necessitates investigating drought variabilities. This study presents a thorough spatiotemporal assessment of drought trends and variabilities over the agriculture-dominated Marathwada Region, Maharashtra, India. The precipitation data is extracted from the India Meteorological Department (IMD) gridded product, whereas actual evapotranspiration (ET) and Evaporative Stress Index (ESI) are obtained from Global Land Evaporation Amsterdam Model (GLEAM) datasets. Standardized Precipitation Index (SPI) is used to characterize drought occurrences at multiple time frames, whereas non-parametric tests, i.e., modified Mann–Kendall (MMK) and Sen’s slope (SS) tests, are employed to detect trends. The results reveal the region to be prone to droughts, and SPI at a longer time frame (i.e., 12-monthly moving frame) can capture drought occurrences better than the shorter time frames, which can be attributed to the lesser randomness in the time series in the longer frame. A mix of positive/negative trends of SPI series are found for the monsoonal months; however, they are relatively more concentrated towards negative ZMMK. Hence, the Marathwada Region can be inferred to have exhibited a relatively increased tendency towards drought occurrences. The seasonal differences in mean values and trends of rainfall, ET, and ESI are discussed in detail. Since the Marathwada Region has a monsoon-dominated climate with high agricultural importance, the information reported in this study will help in devising water management strategies to minimize the repercussions of droughts.
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Availability of data and material
The gridded rainfall data from IMD is freely available all over India. The ET and PET data are extracted from GLEAMS, which is an open-access global dataset. The detailed information on their sources is provided inside the manuscript.
Code availability
The Python codes are available from the corresponding author upon reasonable request. The Python library ‘IMDLIB’ (https://doi.org/10.5281/zenodo.4405233) can be used to read and download the IMD gridded data. More details on IMDLIB can be found here: https://imdlib.readthedocs.io/en/latest/
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Sabyasachi Swain: conceptualization, data curation, formal analysis, visualization, writing—original draft. Surendra Kumar Mishra: supervision, review, and editing. Ashish Pandey: supervision, review, and editing. Deen Dayal: data curation, visualization.
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Swain, S., Mishra, S.K., Pandey, A. et al. Assessment of drought trends and variabilities over the agriculture-dominated Marathwada Region, India. Environ Monit Assess 194, 883 (2022). https://doi.org/10.1007/s10661-022-10532-8
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DOI: https://doi.org/10.1007/s10661-022-10532-8