Is There an Outward Propagating Diurnal Signal in the Precipitation of Tropical Cyclones?

Diurnal pulse (outward propagating signal) is a prominent feature in tropical cyclones (TCs) and closely related to TC structure intensity. It elusive whether the diurnal deep convectively coupled what influence on (daily) mean structure. This study addresses these outstanding problems using long-term satellite precipitation, infrared, microwave data. of precipitation occurs ∼50% days, frequency increases with The cold clouds, microwave-based convection active pulses show significant outward-propagating or phase-delaying features, indicating convective coupling pulsing events. Nearly half have cloud coupled, but reduced (20%–30%) at later stage (12–15 hr) long-duration pulses. Daily top height, ice scattering are markedly enhanced TCs pulse, compared without pulse.