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1 Status of AROME Physics Sylvie Malardel Yann Seity, Gwenaëlle Hello, Christine Lac, Valery Masson, Patrick Lemoigne et al Météo-France/CNRM et Laboratoire d’aérologie

Status of AROME Physics

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Status of AROME Physics. Sylvie Malardel Yann Seity, Gwenaëlle Hello, Christine Lac, Valery Masson, Patrick Lemoigne et al Météo-France/CNRM et Laboratoire d’aérologie. AROME. Aladin dynamical core. AROME Physics. - PowerPoint PPT Presentation

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Page 1: Status of AROME Physics

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Status of AROME Physics

Sylvie MalardelYann Seity, Gwenaëlle Hello, Christine

Lac, Valery Masson, Patrick Lemoigne et al

Météo-France/CNRM et Laboratoire d’aérologie

Page 2: Status of AROME Physics

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AROMEAROME

Aladin dynamical core

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AROME Physics

Current ECMWF radiation scheme called every 15 min (F.M. for SW and RRTM for LW)

Microphysics (vapor+5 hydrometeors) Turbulence (CBR, pronostic TKE) Shallow convection (KFB) + a subgrid representation of clouds

Externalised surface Isba Simple schemes for sea and lakes TEB

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The Daily Arome prototype

MIDPYR since june 2005,

SUDE since september 2005

Replaced by NORE this winter

(plots on ALADIN2 WebSite)

This Arome is running

every day on different domains

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MIDPYRSUDE

NORE

PARI

BRET

AROME domains over FRANCE

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Deep Clouds

•Microphysics

•Coupling with the dynamics

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An AROME good forecast : 21 June 2005

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12 TU

Inst. AROME rainfalls L41 AROME wind

15 TU18 TU21 TU24 TU

21 June 2005 Case

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AROME coupled with Aladin oper

AROME coupled with Aladin 3DVAR

15 TU

21 June 2005 Case

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Z > 60 dBz

12

km

100 km Tabary, 2002

(x) hail + graupel

(o) hail

( ) rain

(o) hail

(x) hail + graupel

( ) rain

graupel

Simulation (Meso-NH)

Microphysical retrievals : IOP 2A (intense convection)

Deep clouds

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hail + graupel

dry snow

rain

Pujol et al., 2005

18:10 UT

18:30 UT

snow

rain

hail + graupel

Meso-NH simulation

Microphysical retrievals : IOP 3 (moderate convection)

Deep clouds

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max : 135 mm

max : 25 mm

m mm

Quasi-stationnary MCS 13-14 Oct. 1995

Cumulated precipitation 01 UTC to 06 UTC the 14th Oct. 1995

MESO-NH, x=10km

max: 31 mm

MESO-NH, x=2.5kmOBSERVATIONS

(Ducrocq et al, 2002)

Initial conditions: ARPEGE analysis at 18UTC

mMESO-NH, x=2.5km

Initialisation Ducrocq et al

(2000)’s

max : 99 mm

Deep clouds

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Deep clouds

As Méso-NH, Arome is able to simulate correctly the organisation of mesoscale convective organisation

Sensitivity to coupling and initial condition

For AROME in 2006

Use diagnostics to evaluate more objectively and statisticaly precipitating events

Adaptation of numerical aspects of the sedimentation parametrization (time splitting) to longer time steps (> 60s)

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Fog (and low clouds)

•Microphysics

•Radiation

•Vertical resolution

•Turbulence in stable layers

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First case of Fog : 7 January 2005

09 TUAROME 2 last levels cloud cover

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15 TU

First case of Fog : 7 January 2005

AROME 2 last levels cloud cover

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Fog

Scientist Model Levels

<50m

Levels

<200m

E.Terradellas Hirlam-INM

(1D version used in Spain)

1 3

O. Liechti tBM 2 7

N.W. Nielsen Hirlam-DMI 13 20

T. Bergot Cobel-Isba 13 20

M. Mueller Cobel-Noah 18 30

J.Cuxart/A.Mira MesoNH 50 89

Bergot et al., 2005, submitted :Intercomparison of 1D numerical models for prediction of the fog( , turbulence, z)

2 events at Paris-CdG. 4 sets of initial conditions (RS): 18UTC (onset), 21 (thickening), 00 (mature) and 03 (disspation)

just a few studies with Meso-NH … But A PRIORITY for AROME

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Meso-NH with sedimentation

Cumulated liquid water content

Meso-NH without sedimentation of small droplets

Bergot et al., 2005, submitted

Late dissipation due to excessive rc : lack of gravitational settling

Crude test : Modification of the autoconversion threshold

Fog

Initialization at 03UTC

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Microphysics : Implementation of the sedimentation for small droplets

Tests on the sensitivity to vertical resolution Additional levels to L41 ? (Cobel-Isba with L41 shows degradation)

Evaluation on CAPITOUL and on several international airports. Run of AROME on Ile-de-France on winter 2005 and in 1D on Casablanca and Varsovie (to be confirmed)

For AROME in 2006

Fog

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Convective boundary layersand stratocumulus

•Shallow convection

•Turbulence

•Subgrid clouds

•Microphysics

•Surface

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Meso-NH with SUBGRID COND + SHALLOW : Adjustment time of 3h in the closure

2005/08/20

09 TU

AROME

Meso-NH with SUBGRID COND + SHALLOW 30min : Adjustment time of 30min

Coupling with Aladin oper (r0)

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Bomex :

LES

'' lw

h3

h1*w

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ARM :

LES

'' lw

h3

h1*w

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ARM : cloud mixing ratio

LES h3

h1 *w

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For AROME in 2006

BL clouds : Cu

1. Modification of the KFB closure (w*, Grant et al, 1999)

2. Improvement of subgrid cloud representation (Bechtold et al, 1995, Lenderink and Siebesma, 2000)

3. Test of EDMF scheme in Meso-NH (P.Soares)

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x= y= 2.5kmSCM

Cloud water mixing ratio

0h LT 12hLT 0hLT

LES

0h LT 12hLT 0hLT

x= y= 500m

Stratocumulus : What’s about the resolutions of AROME ?

I.Sandu

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Liquid Water Path

LES

x=500m,z=10m

x=500m,z=25m

x=500m,z=50m

x=500m,z=80m

I. Sandu

BL clouds : Sc

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For Arome , second part of 2006

Sensitivity tests on vertical resolution for cloud-top entrainmentAdditional levels to L41?

Interest of an entrainment parametrization (Lock, 2001, 2004. ARPEGE-Climat).

Preliminary tests in Meso-NH at the resolutions of AROME

BL clouds : Sc

Diurnal cycle of Sc is maintained at the resolution of Arome

LWC more sensitive to lower z than lower x

Main impact of z at the top of Sc (entrainment) than beneath

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Evaluation CARBOEUROPE

Boundary Layer HeightMESONH vs RS La Cape Sud

0

500

1000

1500

2000

2500

0 500 1000 1500 2000 2500

observed

sim

ula

ted

25-may

26-may

27-may

31-may

06-june

07-june

08-juin

09-juin

10-juin

MESO-NH vs PIPER

La Cape Sud : Comparison Meso-NH/RS of BL height (parcel method) between 6 and 17UTC

Weak overestimation during the afternoon

Weak underestimation during the morning

Forecasts of Meso-NH (8km) in an operational mode during the experiment

Dry CBL

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1. The K-diffusion doesn’t take into account countergradient.

2. Entrainment is not treated explicitly in the K-diffusion approach.

3. But diffusion remains necessary, for transition to neutral or stable BL.

Too unstable

Too sharpe inversion due to lack of top-entrainment33

2Kwith ''

eLCz

Kwp

Eddy-diffusivity (local) :

Dry CBL BUT limitations are well-known, inherent to Eddy-diffusivity

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On L

1L

2L

On the TOMs

2L without TOMs

2L with TOMs

Dry CBL 1. Countergradient with Third order moments

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Dry CBL For AROME in 2006

1. TOMs on heat momentum fitted on LES already implemented in Meso-NH evaluation of the impact for AROME on CBL (needs of evaluation on test cases, impact on unreal rolls ?)

2. EDMF scheme : evaluation of the impact in Meso-NH during the 1st sem.2006 (In collaboration with P.Soares)

3. Comparison EDMF/TOMS on the same casesUnder development in Meso-NH (2006-

2008)

1. Improvement of EDMF scheme : entrainment, extension to momentum transport (In collaboration with P.Soares in 2006)

2. Parametrization of TOMs with an entraining plume used to find the mass-flux.

3. Improvement of the BL89 mixing length in the same way (V.Masson)

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Summary• An Arome daily prototype has been running for 6

months (without any blow up)• Some good forcasts and some less good (but only

qualitative and episodic validation) • Some imperative improvement have to be done

quickly on the physics before more serious validation– Shallow convection and subgrid clouds– Fog dissipation

• Numerical improvement : SL sedimentation• Other preoccupations : Sc, Dry BL etc