Atmospheric sciences colloquia

Back to Listing

Seminar coordinator: Prof. Jeff Trapp (jtrapp at illinois.edu)

 

"Influence of cloud-radiative forcing on tropical cyclone structure"

Event Type
Seminar/Symposium
Topic
graduate
Sponsor
Department of Atmospheric Sciences, University of Illinois
Location
Room 114 of the Transportation Building
Date
Dec 4, 2013   3:00 pm  
Speaker
Professor Robert Fovell, Department of Atmospheric and Oceanic Sciences, UCLA
Contact
Shirley Palmisano
E-Mail
sjpalm@illinois.edu
Phone
217-244-5737
Views
1157

We demonstrate how and why cloud-radiative forcing (CRF), the interaction of hydrometeors with longwave and shortwave radiation, can influence tropical cyclone structure through "semi-idealized" integrations of the Hurricane Weather Research and Forecasting (HWRF) model and an axisymmetric cloud model. Averaged through a diurnal cycle, CRF consists of pronounced cooling along the anvil top and weak warming through the cloud, which locally reverses the large net cooling that occurs in the troposphere under clear-sky conditions. CRF itself depends on the microphysics parameterization, and represents one of the major avenues through which simulations are sensitive to microphysical assumptions.

 

By itself, CRF enhances convective activity in the tropical cyclone's outer core, leading to a wider eye, a broader tangential wind field, and a stronger secondary circulation. This forcing also functions as a positive feedback, assisting in the development of a thicker and more radially extensive anvil than would otherwise have formed. Our simulations clearly show that the weak (primarily longwave) warming within the cloud anvil is the major component of CRF, directly encouraging stronger upper tropospheric radial outflow as well as slow, yet sustained, ascent throughout the outer core. In particular, this ascent leads to enhanced convective heating, which in turn broadens the wind field, as demonstrated with dry simulations using realistic heat sources.

 

As a consequence, improved tropical cyclone forecasting in operational models may depend on proper representation of cloud-radiative processes, as they can strongly modulate the size and strength of the outer wind field that can potentially influence cyclone track as well as the magnitude of the storm surge.

link for robots only