Asymmetric longwave radiative forcing accelerates early tropical cyclone intensification (conjecture)

Establish whether asymmetric longwave radiative forcing leads to faster early 24-hour intensification of maximum surface winds within the linear Variational Encoder-Decoder model trained on convective-permitting WRF simulations used in this study, thereby rigorously testing the conjecture stated by the authors.

Background

The paper investigates how three-dimensional radiative heating patterns relate to early tropical cyclone intensification using a linear Variational Encoder-Decoder (VED) trained on convection-permitting WRF simulations of Typhoon Haiyan (ensemble) and Hurricane Maria (control and no-CRF experiments). A prominent wavenumber-1 (asymmetric) structure in the learned longwave heating pattern (Π_{μLW}) emerges as most associated with intensification in the model.

To probe causal relevance, the authors perform synthetic perturbation experiments by adding either the asymmetric learned pattern or its azimuthal mean (axisymmetric) counterpart to inputs. They find stronger predicted intensification responses to the asymmetric perturbations, but characterize this as a conjecture, indicating the need for a more rigorous establishment of whether asymmetric longwave forcing indeed accelerates early intensification in their data-driven framework.