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SEQUENCE:1
UID:UW-Physics-Event-8853
DTSTART:20240822T150000Z
DTEND:20240822T170000Z
DTSTAMP:20260413T171830Z
LAST-MODIFIED:20240821T215930Z
LOCATION:5280 Chamberlin - https://uwmadison.zoom.us/j/97392744497?pwd
=klf707ltRKhu07htO7ux2IqTTFsANh.1
SUMMARY:Available Energy and Slow Eigenmodes for Understanding Moistur
e and Phase Changes in Atmospheric Physics\, Thesis Defense\, Brad Kum
m\, Physics Graduate Student
DESCRIPTION:In atmospheric physics\, clouds and moisture are some of t
he greatest challenges. They are the leading source of uncertainty in
climate change predictions\, and rainfall is arguably the most challen
ging quantity to predict in weather forecasts. In addition\, theoretic
al understanding of moisture in the atmosphere lags behind the underst
anding of a dry atmosphere. To increase our theoretical understanding
of moisture in the atmosphere this work focuses on two concepts: (i) E
nergy\, and in particular Available Potential Energy (APE)\, and (ii)
slow eigenmodes. The first results presented center around a new decom
position of APE for a compressible\, adiabatic atmosphere with phase c
hanges\, and shows that it can be decomposed into acoustic and buoyant
pieces\, which are present in dry decompositions\, as well as a new s
low "latent" piece which accounts for a parcel changing between satura
ted\, and unsaturated states. Second\, a method is presented to accoun
t for moisture in a global atmospheric decomposition framework\, by sp
litting it into an Inertio-gravity piece\, a Rossby piece\, and an add
itional "slow" piece which accounts for a large fraction of the total
atmospheric moisture. Finally\, such a decomposition is performed usin
g global moisture data\, in what may be the first moist decomposition
of this kind\, in order to quantify the relative contributions of each
of these pieces.
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URL:https://www.physics.wisc.edu/events/?id=8853
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