hector simulation we found simulation largely depending on: model initialization scheme lateral...

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Hector simulation We found simulation largely depending on: • Model initialization scheme • Lateral boundary conditions • Physical processes represented in the model

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Hector simulation

We found simulation largely depending on:

• Model initialization scheme

• Lateral boundary conditions

• Physical processes represented in the model

Hector simulation – 06.02.2006 case

WRF initial conditions

1km resolution WRF domain

WRF lateral boundary conditions

1616thth November 2005 – single November 2005 – single `cell’`cell’

1616thth November 2005 November 2005

3030thth November 2005 – multi-cell November 2005 – multi-cell

3030thth November 2005 November 2005

1010thth February 2006 –squall - February 2006 –squall -likelike

1010thth February 2006 February 2006

1010thth February T, w February T, w

66thth February 2006 - weak February 2006 - weak

66thth February February

66thth February 2006 February 2006

Hector simulation – 06.02.2006 case

Radar observed WRF simulated

Precipitation

Hector simulation – 06.02.2006 case

Observed and simulated radar reflectivity along the W-E cross section of Hector

Observed Simulated

Hector simulation – 06.02.2006 case

Observed (red) and simulated (green) surface latent and sensible heat flux

Over the sea Over the land

Hector simulation – 06.02.2006 caseDornier observed (red) and WRF simulated (green) low level

variables

Tem

pera

ture R

ela

tive

hu

mid

ity

U w

ind

com

pon

en

t

V w

ind

com

pon

en

t

Hector simulation – 06.02.2006 caseEgret observed (red) and WRF simulated (green) high level

variables

Tem

pera

ture

U w

ind

com

pon

en

t

V w

ind

com

pon

en

t

Hector simulation – 06.02.2006 caseSimulated aerosol effect ?

Sim

ula

ted

tota

l ra

in

wate

r

Time

Hector simulation – 06.02.2006 caseSimulated aerosol effect ?

Sim

ula

ted

tota

l clo

ud

w

ate

r

Time

Hector simulation – 06.02.2006 caseSimulated aerosol effect ?

Sim

ula

ted

tota

l clo

ud

ice

Time

Hector simulation – 06.02.2006 caseSimulated aerosol effect ?

Sim

ula

ted

tota

l sn

ow

w

ate

r

Time

SummarySummary

• Two modes of simulationTwo modes of simulation– OF – doesn’t work too well in generalityOF – doesn’t work too well in generality– DA – gives good agreement for a lot of DA – gives good agreement for a lot of

cases, but the statistics show too low cases, but the statistics show too low cloud fraction.cloud fraction.

• Aerosol effects are present for the 6Aerosol effects are present for the 6thth February case.February case.– Need more simulations of different cases Need more simulations of different cases

to see how robust this is.to see how robust this is.