Response of atmospheric river width and intensity to aquaplanet warming: A detection algorithm- and background moisture-independent approach

The width of an atmospheric river (AR) is an important parameter when evaluating its impact. Although previous research suggests ARs will widen with global warming, a precise response has been muddled by the large sensitivity of width to a diverse set of AR detection techniques (ARDTs). Here we propose a methodology that removes the influence of the ARDT by modeling AR integrated vapor transport (IVT) profiles as idealized exponential curves with free parameters given by background IVT, intensity above background IVT, and profile width. Notably, our definition for AR profile width does not include any explicit numerical thresholds, relative or absolute, for IVT. We apply our approach to a series of idealized aquaplanet experiments, first with a baseline sea-surface temperature (SST) distribution, then with +2K, +4K and +6K uniform warming, so as to determine the contributions of each free parameter to AR width. We also apply our approach to high resolution atmosphere-only models forced ..., , # Response of atmospheric river width and intensity to aquaplanet warming: A detection algorithm- and background moisture-independent approach

This dataset provides integrated vapor transport (IVT) and TempestExtremes catalogs for (i) the CESM2 uniform warming experiments and (ii) the CMCC-CM2-VHR4 and MPI-ESM1-2-HR highresSST experiments. Integrated water vapor is also included for the CESM2 experiments. The data provided here accompany (and can be used to reproduce) the results of the above-mentioned study. Brief descriptions of model experiments are provided below:

The CESM2 model is run under an aquaplanet configuration at 3-hourly time resolution. The aquaplanet has no land, sea, ice, topography, or axial tilt (i.e., perpetual equinox conditions), and features a single-layer “data ocean” which thermally forces the atmosphere with fixed sea surface temperatures (SSTs). Specifically, we use the “QOBS” profile from Neale and Hoskins (2000), while the warming scenarios feature global...,