17 studied precipitation indices in the Xingu watershed (east of the BLA) and its research shows a decrease trend in precipitation in the central area and an increase in the northern part of the basin; while the number of consecutive dry days presents a positive trend along most part of the basin, concentrated in its central part.
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Identifying clusters of precipitation for the Brazilian Legal Amazon based on magnitude of trends and its correlation with sea surface temperature.
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45 also used the Sen's slope method and found a decreasing trend of precipitation for the period between 1980 and 2015 in the Eastern Amazon, concluding that the trend in precipitation was not consistent across the entire Amazon, with some areas experiencing increased precipitation while others experienced decreased precipitation.
A “slight increase” denotes a positive trend indicating a gradual rise in precipitation levels, while a “slight reduction” indicates a negative trend signifying a modest decrease in precipitation levels.
Some studies have found that there has been an overall trend of increased precipitation in the region over the past few decades, while others have found a trend of decreased precipitation.