Precipitation extremes during the soybean planting period in the MATOPIBA region
DOI:
https://doi.org/10.5902/2179460X84041Keywords:
Consecutive dry days (CDD), Consecutive wet days (CWD), Expert team on climate change detection and indices (ETCCDI), Extreme eventsAbstract
This work aims to analyze the variability of extreme consecutive dry days (CDD) and wet days (CWD) during the soybean planting period (October-November-December) in the MATOPIBA region from 1980 to 2019. Daily precipitation data from Xavier et al. (2022) was used, with a spatial resolution of 0.1° x 0.1° and a temporal resolution from 1980 to 2019. The extreme climate indices used (CDD and CWD) were defined by the ETCCDI (Expert Team on Climate Change Detection and Indices) and statistical techniques were applied for a better understanding of precipitation variability in the region of interest. Among the main results, an increasing (decreasing) trend of 1 to 3 (1 to 2) days/decade in CDD (CWD) events in October was observed, along with an increasing trend (2 days/decade) in CDD events in December. These results may imply a delay in the implementation of the harvest (October) and a water deficit during the plant’s vegetative period, due to irregularities in December rainfall. Furthermore, there was a strong influence of the El Niño Southern Oscillation phenomenon on precipitation indices, serving as an additional limiting factor in rainfall distributions in MATOPIBA.
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