We studied the storm tracks from a Lagrangian perspective, tracking cyclones using the TRACK routine of Hodges (1995, 1999) on relative vorticity at 850-hPa. We studied cyclones in both the Southern and Northern Hemispheres, during their respective summer and winter seasons.
The results show that the storm tracks shift in response to the altered SST consistent with previous studies. But the SST also impacts the storm characteristics, particularly with regards to their strength and propagation. For instance, with warmer SSTs at low latitudes, mid-latitude cyclones travel further, both meridionally and zonally, and are more intense. The changes in strength and propagation moreover are related, consistent with models of vortex self-advection in the presence of a mean PV gradient.