This study provides an updated dynamical analysis of the observed climate conditions during the longest, most severe and continuous drought (2012–2016) ever recorded in Northeast Brazil (NEB). This investigation was carried out based on temperature, precipitation, sea surface temperature, outgoing long-wave radiation, and ERA-Interim reanalysis data from 1981 to 2016. This was done by first looking for the area of the NEB where the drought was most severe, and then calculating the main rainy season anomalies and atmospheric parameters from 2012 to 2016 in relation to the climatological conditions (1981–2010). Results show this drought event was influenced mainly by two distinct oceanic conditions that induced anomalous atmospheric circulation patterns. The observed negative precipitation anomalies were firstly related to the northward displacement of the Intertropical Convergence Zone (ITCZ), followed by an anomalous upward motion over the Western Amazon, as well as the anomalous precipitation deficit along the South Atlantic Convergence Zone, that was slightly displaced southward of the climatological position. From 2015 to 2016 the subsidence over NEB Brazil was linked to the descending branch of the Walker circulation, as well as to the strong anomalous flow induced by convection in the ITCZ over Africa and Gulf of Mexico.

这项研究提供了巴西东北地区（NEB）记录的最长，最严重和连续干旱（2012-2016）期间观测到的气候条件的最新动态分析。这项调查是根据1981年至2016年的温度，降水，海面温度，外向长波辐射以及ERA-Interim重新分析数据进行的。此操作是首先寻找干旱最严重的NEB地区，然后计算与气候条件（1981–2010年）相关的2012年至2016年的主要雨季异常和大气参数。结果表明，该干旱事件主要受两种不同的海洋条件的影响，这些条件导致大气环流异常。观测到的负降水异常首先与热带辐合带（ITCZ）的北移有关，其次是西亚马逊河上的异常向上运动，以及南大西洋辐合带沿南降水的赤字异常，该位移略有位移气候位置的南部。从2015年到2016年，巴西NEB的沉降与Walker环流的下降分支有关，也与ITCZ在非洲和墨西哥湾对流引起的强烈异常流量有关。