Defenses for Spring 2020

ORIGINS AND IMPACTS OF TROPOPAUSE LAYER COOLING IN TROPICAL CYCLONES

February 14, 2020

Louis Rivoire

Remote sensing data from GPS radio occultation reveal temperatures lower than climatological average over a layer several kilometers deep near the tropopause above tropical cyclones (TCs). This signal, here referred to as tropopause layer cooling (TLC), occurs primarily during TC intensification and on spatial scales of the order of 1000 km. TLC has been hypothesized to be the result of: 1)…

OBSERVATIONS OF AEROSOL PARTICLES AND DEEP CONVECTIVE UPDRAFTS AND THE MODELING OF THEIR INTERACTIONS

February 04, 2020

Peter Marinescu

Within cloud updrafts, cloud droplets form on aerosol particles that serve as cloud condensation nuclei (CCN). Varying the concentrations of CCN alters the concentrations of cloud droplets, which in turn modifies subsequent microphysical processes within clouds. In this dissertation, both observational and modeling studies are presented that reduce the uncertainties associated with these…