Rainfall is a major component of the hydrological cycle. The lack of basic information on rainfall spatial variability is a major source of uncertainty in many fields of studies, e.g., meteorology, hydrology, and agriculture. Satellite rainfall measurements are becoming increasingly popular for their extensive database and reliable estimates. The objective of this study was to use the Tropical Rainfall Measuring Mission (TRMM) dataset along with rain gauges to characterize aspects of rainfall spatial variability and discuss the possible impacts from recent trends in the Brazilian savannah biome (Cerrado). Gauge stations were used to assess TRMM bias error and calibrate data for further analyses. Rainfall rates and their spatial variability showed a strong relationship to the transition zones between different biomes. Rainfall showed a decreasing trend for the eastern region of the Cerrado biome, a region characterized by a recent and significant expansion of crop areas. These trends agree with results from different studies which highlight the current drawdown of groundwater levels and reduced discharge, and possible lengthening of the dry season in the long run. As many conflicts have already been documented for this region, these decreasing trends are alarming for urgent and consistent hydroclimatic monitoring, and improved water resources planning and management. Positive trends for rainfall in the central Cerrado are likely a momentary recovery of recent-period drought.

降雨是水文循环的主要组成部分。缺乏有关降雨空间变异性的基本信息是许多研究领域（例如气象学、水文学和农业）不确定性的主要来源。卫星降雨量测量因其广泛的数据库和可靠的估计而变得越来越受欢迎。本研究的目的是使用热带降雨测量任务 (TRMM) 数据集和雨量计来表征降雨空间变异的各个方面，并讨论巴西大草原生物群落 (Cerrado) 近期趋势的可能影响。测量站用于评估 TRMM 偏差误差并校准数据以进行进一步分析。降雨率及其空间变异性与不同生物群落之间的过渡区密切相关。塞拉多生物群落东部地区的降雨量呈下降趋势，该地区的特点是近期作物面积显着扩大。这些趋势与不同研究的结果一致，这些研究强调了当前地下水位下降和排放减少，以及从长远来看可能延长旱季。由于该地区已经记录了许多冲突，这些减少的趋势对于紧急和一致的水文气候监测以及改进水资源规划和管理来说是令人震惊的。塞拉多中部降雨的积极趋势可能是近期干旱的暂时恢复。这些趋势与不同研究的结果一致，这些研究强调了当前地下水位下降和排放减少，以及从长远来看可能延长旱季。由于该地区已经记录了许多冲突，这些减少的趋势对于紧急和一致的水文气候监测以及改进的水资源规划和管理来说是令人震惊的。塞拉多中部降雨的积极趋势可能是近期干旱的暂时恢复。这些趋势与不同研究的结果一致，这些研究强调了当前地下水位下降和排放减少，以及从长远来看可能延长旱季。由于该地区已经记录了许多冲突，这些减少的趋势对于紧急和一致的水文气候监测以及改进的水资源规划和管理来说是令人震惊的。塞拉多中部降雨的积极趋势可能是近期干旱的暂时恢复。