Abstract
Droughts pose serious threats to the agricultural sector, especially in rainfed-dominated agricultural regions like those in Argentina’s Humid Pampas. This region was recently impacted by slow-evolving and long-lasting droughts as well as by flash droughts, resulting in losses reaching thousands of millions of US dollars. Improvements of drought early warning systems are essential, particularly given the projected increase in drought frequency and severity over southern South America. The spatial and temporal relationship between precipitation deficits, soil moisture and vegetation health anomalies are crucial for better understanding and representation of the agricultural droughts and their impacts. In this context, the Combined Drought Indicator (CDI) considers the causal and time-lagged relationship of these three variables. The study’s objective is twofold: (1) Analyze the time-lagged response between precipitation deficits, soil moisture and satellite fAPAR anomalies; and (2) Evaluate the CDI’s capability to characterize the severity of drought events on the Humid Pampas against agricultural yield estimations and simulations, as well as agricultural emergency declarations. The correlation among the variables shows strong spatial variability. The highest Pearson correlation values (r > 0.42) are observed over parts of the Humid Pampas for time lags of 0, 10, and 20 days between the variables. Although the CDI has limitations, such as its coarse spatial resolution and monthly temporal resolution of precipitation data, it effectively tracks the progression of major drought events in the region. The CDI’s performance aligns well with estimations and simulations of soybean and corn yields, as well as official declarations of agricultural emergencies. Insights from this study also provide a basis for discussing potential improvements to the CDI. This study highlights the global and regional significance of evaluating and enhancing the CDI for effective drought monitoring, emphasizing the role of collaborative efforts for future advancements in drought early warning systems.
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Acknowledgements
The data for this work were acquired through the Global Drought Observatory portal (https://edo.jrc.ec.europa.eu/gdo) and through the Secretaria de Agricultura, Ganader?a y Pesca of Argentina.
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P.S., G.N. and C.C. wrote the main manuscript text. M.P. and P.S prepared all figures. A.B. conducted the crop simulations. M.M. conducted bootstrap analysis. All authors reviewed the manuscript.
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C., S.P., Naumann, G., Peretti, M. et al. Evaluation of a combined drought indicator against crop yield estimations and simulations over the Argentine Humid Pampas. Theor Appl Climatol (2024). https://doi.org/10.1007/s00704-024-05073-8
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DOI: https://doi.org/10.1007/s00704-024-05073-8