Biological, Environmental, & Climate Sciences (BECS) Department Seminar
"Evaluation of Cloud Parameterisations in Climate Models Using Satellite Observations"
Presented by Johannes Quaas, NASA GISS
Monday, May 11, 2015, 1:30 pm — Conference Room, Bldg 815E
Fractional cloudiness in climate models is parameterised in terms of the subgrid-scale variability of humidity. This variability is expressed explicitly or implicitly as the probability density function (PDF) of the total-water specific humidity. No large-scale high-resolved observations of water vapour exist. I will present four approaches to evaluate the humidity PDF despite this observational shortcoming, and show their application to evaluate different cloud schemes. I will then discuss the implications for other cloud processes, and the subsequent improvements within the ECHAM climate model. If time permits, I will also briefly summarise one recent study on an observational constraint on the aerosol radiative forcing.
Hosted by: Stephen Schwartz
10769 | INT/EXT | Events Calendar