evidence: We analyzed four separate regions of the Atlantic Ocean—a basin noted for pronounced multidecadal variability. In the South Atlantic (Fig. 7o), there is a detectable anthropogenic warming for start dates up to the late 1970s. An interesting feature in this region is that warming trends from the late 1800s are near the 95th percentile of the all-forcing model simulations. North Atlantic SSTs (45°–60°N; Fig. 8a) exhibit no detectable trends outside of the range of natural variability for any start dates, according to our analysis. This region is notable for having probably the least detectable signal of any of our study regions around the globe. Despite the lack of detectable trends, the observed trends are at least consistent with the all-forcing runs, which have a very wide 5th–95th percentile range of trends due to the large simulated internal variability, as will be shown later in this section. In the subtropical North Atlantic (20°–45°N; Fig. 8b) an anthropogenic signal is detected for start dates from about 1890 to 1920 and around 1970, but otherwise is only borderline detectable up to about 1980.