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A Maloney Group, Weak Temperature Gradient Balance Perspective. Large-scale circulation response alters moisture field. Precipitation is a strong increasing, non-linear function of lower free tropospheric humidity. ????. MJO. - PowerPoint PPT Presentation
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A Maloney Group, Weak Temperature Gradient Balance
Perspective
Precipitation is a strong increasing, non-linear function of lower free tropospheric humidity
Diabatic heating profile result of integrated effects
of cloud population and radiationDiabatic heating
structure influences large-scale circulation
response
Large-scale circulation
response alters moisture field
MJO
????
SLHF OLR in
ERAi
import
neutral/
export
export
EddyMixin
g
What terms are dominant?
What is the phase relation of these terms?
Do the answers to these questions change dramatically
with location?
westerly mean statewest-east moisture
gradient
easterly mean stateeast-west moisture
gradient
easterlies poleward of
~7.5°
pole-equator moisture gradient
An Old Problem
Where is the MJO?
The RMM index only gives us a rough estimate
At what phase is the MJO “directly over” the DYNAMO domain?
How about TOGA-COARE?
A New Diagnostic
0°
90°
180°
270°each gridpoint has its own “phase”
gridpoint phase
0°
90°
180°
270°corresponds to RMM phase of maximum (+) MJO related anomaly in a
variable
gridpoint phase
RMM phase
EX: for zonal wind this corresponds to maximum westerly winds
0°
90°
180°
270°corresponds to RMM phase of maximum (-) MJO related anomaly in a variable
gridpoint phase
RMM phase
EX: for zonal wind this corresponds to maximum easterly winds
0°
90°
180°
270°Tells you where you are in MJO lifecycle
gridpoint phase
RMM phase
45°prior to maximum (+) anomaly
0°
90°
180°
270°Tells you where you are in MJO lifecycle
gridpoint phase
RMM phase
45°after maximum (+) anomaly
Identifies at what “RMM” phase <q> maximizes at each location
Objectively calculated from EOF structure
DYNAMO TOGA-COARE
Does it work?
Composites as a function of MJO lifecycle
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Point #1: Phasing Changes
Peak of convection
<q> (850-500)
October-April Column Integrated MSE Budget
RMM > 1
Composite as function of MJO lifecycle at each location using new diagnostic
MSE Composite Analysis
Suppressed
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Point #2: Phasing Matters
Point #3: Mean State Matters
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?
?
Substantial cancelation in lat. average
Just after peak of convectionSLHF
Suppressed
Transition to Enhanced
Enhanced
Transition to Suppressed
Suppressed
Suppressed
Transition to Enhanced
Enhanced
Transition to Suppressed
Suppressed
Suppressed
Transition to Enhanced
Enhanced
Transition to Suppressed
Suppressed
Near complete cancelation, all times, everywhere
Radiation Dominant….. Missing Physics?
Suppressed
Transition to Enhanced
Enhanced
Transition to Suppressed
Suppressed
Horizontal Advection
SLHF
Point #4: In ERAi, horizontal advection drives tendency
Point #5: Local vs. large-scale processes at work
Zonal advection and SLHF are very large locally and correspond with intraseasonal OLR maxima, but are very weak in lat. average.
- Helps determine locations of maximum intraseasonal variance
Meridional advection is small locally and does not correspond with intraseasonal OLR maxima, but is very large in lat. average.
- Conditions tropics on large scale
Questions