DYNAMO—DYNAmics of the MJO
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DYNAMO—DYNAmics of the MJO Shipboard operation of the NASA/TOGA radar. Photo courtesy of T. Lang. September 2011 – February 2102. NASA TOGA radar. Strong westerlies in MJO2. SST pattern quite interesting! Ocean really never “ recovered ” after MJO2. SST. AIR.

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DYNAMO—DYNAmics of the MJO Shipboard operation of the NASA/TOGA radar

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DYNAMO—DYNAmics of the MJO

Shipboard operation of the NASA/TOGA radar

Photo courtesy of T. Lang

September 2011 – February 2102


NASA TOGA radar


Strong westerlies

in MJO2

SST pattern

quite

interesting!

Ocean really

never “recovered”

after MJO2.

SST

AIR

Prolonged periods (> 24 hours) of

negative net flux rare in tropics. These

are periods when ocean cools through

loss of latent and sensible heat (SST> Tair)

and reduction in solar insolation. This is part

of the story!

Moum et al. 2014


Yoshida-Wyrtki jet, westerly surface current.

Mixing promoted by strong vertical shear brings cool, salty water to the surface.

Shear induced mixing is significant component for lowering the SST’s,

in addition to surface fluxes/insolation. MJO2 resulted in a major cooling of the upper ocean. Did this have an impact on MJO3, which was much

weaker?

Shallow thermocline in Indian O. allows access to cooler water.

Moum et al. 2014


Surface wind stress


Daily Evolution: Convective Population

1. In phase:

RH, Rainrate,

Strat. Rain.

2. In phase:

SST, Lightning,

CAPE.

Role of Aerosols?


Kdp proportional to mass content and

mass-weighted oblateness ratio

A little background…

Kdp is a measure of the difference in wave propagation between H and V polarizations; sensitive to non-spherical particles

b

50

Rain

a

0.5 deg elevation angle

40

Z

Reflectivity

30

Based on computations

of Z and Kdp from DSD

assumptions

Oklahoma

Differential Reflectivity

0

4

6

2

Kdp

deg/km Difference in H,V phase in degrees


Normalized density of points expressed as a percentage

Warm rain

Colorado and “tropical”

events

Ice based

N-Pol in Oklahoma

Results consistent with

active coalescence growth

and ice-based precipitation.

Resulting from higher

moisture contents, higher

freezing level, collisional

breakup, etc.

N-Pol data are clearly going

to help us better understand

DSD variability and the physics leading to the variability.

N-POL

N-POL


24 Feb 1999

WEST case.

Lower CAPE,

monsoon-like regime.

26 Jan 1999 EAST case.

Stronger

convection,

higher CAPE.

Subtle

differences

between

East and

West

WEST

EAST

0


Pretty much a

tropical regime….

KDOX 10/28/2012: Merger of Sandy's outer bands with N/S oriented front. This confluence caused significant precipitation along the western shore of the Chesapeake Bay.


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