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Analysis of Convectively Coupled Equatorial Kelvin Waves in a GCM with
a Modified Entrainment Profile
Raymond RuizDept. of Physical and Mathematical Sciences at North Carolina State University, Raleigh, NC
Walter Hannah, & Dr. Eric MaloneyDept. of Atmospheric Sciences, Colorado State University, Fort Collins, CO
About Me
http://upload.wikimedia.org/wikipedia/commons/c/c4/Hurricane_Georges_(Puerto_Rico).PNG
Born in Puerto Rico
Hurricane George
Senior at North Carolina State University
Tropical Meteorology, Severe Weather, and SNOW
Convectively Coupled Kelvin Waves
Eastward propagating waves C= √gH,
H is equivalent Depth Major weather producer in the tropics Not well represented in Global Climate Models
Entrainment
Entrainment Turbulent flow captures
non-turbulent flow Mixing more
environmental air, diluting, less potent
Allows for representation of Shallow Convection
http://www.cmmap.org/images/learn/clouds/entrainment.jpg
Model and Parameterizations
Observational- NOAA interpolated OLR data used from 1980-2011
NCAR Community Atmosphere Model 5 (CAM5).
Control- Entrainment known as the Relaxed Arakawa and Schubert (RAS) Total Precip. Mm/day
Experiment- Entrainment in model is being increased(λ) Total Precip. Mm/day
Methods
Energy as a function of frequency and wavenumber
Kelvin wave filtering process
All season variance plots in order to obtain area of greatest signal
Wave regression with multiple variables, horizontal structure, latitude vs. longitude
Wave lagged regression for cross section overview, time vs. height
Wheeler and Kiladis et al.
Function of frequency vs. Zonal wave number
Theoretical curves vs. Power
Tells us propagation speeds and wave cycle
Control Experiment
Observation
All Season Varience
Experiment
Observation
Control
Theoretical Kelvin Wave
Regression Technique
Observation -OLR
Control -Precip
Experiment -Precip
Observation
Control
Experiment
Heating Specific Humidity
Zonal Wind Temperatur
e
Observation
Control
Experiment
Summary
Slower propagation speeds Linear, coherent propagation signal More pronounced vertical structure General improvements, causes for improvements
require further research.
Thanks for listening!!! Good Luck Leah!