How are the sea level rise scenarios in the 2022 report different from the 2017 report?

The 2022 technical report includes five possible scenarios of global sea level rise by 2100: Low (1 foot; 0.3 meters), Intermediate Low (1.6 feet; 0.5 meters), Intermediate (3.3 feet; 1.0 meter), Intermediate High (4.9 feet; 1.5 meters), and High (6.6 feet; 2.0 meters). These same scenarios were in the 2017 technical report, but the Extreme (8.2 feet; 2.5 meters) scenario included in 2017 has been removed.

The 2100 projections for each global scenario stayed the same, since science suggests this range of futures remains possible. However, the timing for different rates of rise for the different scenarios was updated based on new modeling and more realistic assumptions of Greenland and Antarctic ice sheet behavior based upon the Intergovernmental Panel on Climate Change Sixth Assessment Report. A result is that there is less acceleration in the higher scenarios until about 2050 and greater acceleration toward the end of this century. This has two primary implications. First, despite maintaining the same target values and having the same range between scenarios in 2100, the range covered by the scenarios is smaller in the near term than in the 2017 report. Second, the likely (17th-83rd percentile) ranges of projections for each scenario before and after the 2100 time point used to define the scenarios are wider than in the 2017 report.