1© Roma, 09.2019 JM Bettems

PT TERRA Nova, 09.2016 – 02.2019Y. Ziv / IMS (PTL), V. Bessenbecher / ETHZ

• Compare different recent versions and configurations ofTERRA, on different target domains

• Compare COSMO-TERRA with COSMO-CLM (Community Land Model), MSc ETHZ

PT TERRA NOVA – Final Report August 2019

Resources:• 1.0 FTEs• 7 COSMO contributors + 3 colleagues from ETH Zurich (COSMO-CLM2 community)• IMS, RHM, MCH, DWD, ETHZ• 24 years of weather simulation• ~ 18 Million ECMWF-HFPC BUs + RHM computing time• ~ 40 Terra Bytes of output data

PT TERRA NOVA – Simulations Setup

MED

EU

NE

EUConfigurations Verification

resolution

from

un

till

v5

.0

Ba

sic

Ad

va

nce

d

Old

Tu

rb

Ad

va

nce

d

T2

m

RH

2m

T S

oil (1

8, 5

4

cm

)

W S

oil (1

8,

54

cm

)

Grid

de

d

Da

tab

ase

s*

6 01/11/14 31/12/15 √ √ √ √ √ √ √ √ √

6 01/11/02 31/12/03 √ √ √

6 01/11/05 31/12/06 √ √ √

2 01/11/14 31/12/15 √ √ √ √ √ √ √ √ √

MEDConfigurations Verification

resolution

from

un

till

v5

.0

Ba

sic

Ad

va

nce

d

Old

Tu

rb

Ad

va

nce

d

T2

m

RH

2m

T S

oil (1

8, 5

4

cm

)

W S

oil (1

8,

54

cm

)

6.25 01/01/16 31/08/15 √ √ √ √ √ √ √ √

2.5 01/01/16 31/08/15 √ √ √ √ √ √ √ √

NEConfigurations Verification

resolution

from

un

till

v5

.3

Ba

sic

Ad

va

nce

d

Old

Tu

rb

Ad

va

nce

d

T2

m

DP

2m

T S

oil

inte

rco

mp

ari

so

n

W S

oil

inte

rco

mp

ari

so

n

6.6 01/11/15 31/12/16 √ √ √ √ √ √ √

2.2 15/04/16 31/10/16 √ √ √ √ √ √ √

* Performed by Verena Bessenbacher as part of her M. Sc. Thesis (Bessenbacher V., 2018)

PT TERRA NOVA – Simulations Setup

COSMO

BC from IFS/ICON

IC fr

om IF

S/IC

ON

IC fr

om a

rchi

ve/I

CON

IC fr

om IF

S/IC

ON

00h 00h24h

COSMO

Hindcast ModeMED & EU V5.00 V5.05

Parameter Module Reference Basic Adv. Old Turb Advanced

/TUNING/

tkhmin

Turbulence

0.4 0.4 0.4 0.75tkmmin 0.4 0.4 0.4 0.75rat_sea 20.0 20.0 20.0 7.5patlen 500.0 500.0 500.0 750turlen 150.0 150.0 150.0 500a_hshr 0.2 0.2 0.2 2.0c_soil 1.0 1.0 1.0 1.75/PHYCTL/

loldtur

Turbulence

N/A TRUE TRUE FALSEitype_vdif -1 -1 -1 -1ltkeshs FALSE FALSE FALSE TRUEitype_sher 1 1 1 0imode_tran 1 1 1 0imode_turb 1 1 1 1icldm_tran 0 0 0 2itype_aerosol Aerosol 1 1 1 2itype_root

TERRA

1 1 2 2itype_heatcond 1 1 3 3itype_evsl 2 2 2 2idiag_snowfrac N/A 1 1 1cwimax_ml N/A 1.0E-6 0.0005 0.0005lemiss FALSE FALSE TRUE TRUElstomata FALSE FALSE TRUE TRUE

Namelist Configuration (MED & EU domains)

PT TERRA NOVA – Results

0

1

2

3

4

5

6

7

8

RMSE [?C]

version

RMSE Distribution for Model VersionsEU Domain, 6.5km

0

1

2

3

4

5

6

RMSE [?C]

version

RMSE Distribution for Model VersionsMED Domain, 2.5km

2m Temperature RMSE in 3 domains:EU 6km (top-left), MED 2.5km (top-right), NE 2.2km (bottom-right).In EU domain Advanced configuration performs the worst, while in MED domain Advanced configuration is some what better. In NE domain Advanced configuration has the lowest RMSE.

PT TERRA NOVA – Results

2m RH and DP RMSE in 3 domains:EU 6km (top-left), MED 2.5km (top-right), NE 2.2km (bottom-right).In EU domain Advanced configuration performs the worst, while in MED domain Advanced configuration is some what better. In NE domain Advanced configuration performs well, but 5.05 version with old turbulence scheme outperforms it in some cases.

0

5

10

15

20

25

30

RMSE [%]

version

RMSE Distribution for Model VersionsRH(%), MED Domain, 2.5km

0

5

10

15

20

25

RH [%]

version

RMSE Distribution for Model VersionsEU Domain, 6.5km

PT TERRA NOVA – Results

Soil Water Content in 3 domains:EU 2km (top-left), MED 2.5km (top-right), NE 2.2km (bottom-right).EU & NE domains show no extra drying of soil in Advanced configuration, whether in point verification or domain mean. MED domain shows a quicker drying of soil in northern Israel.

0

50

100

150

200

250

WC (integral) [Kg/Kg]

12Z Soil Water Content at 50cm - Comparing ConfigurationsAfula - Northern Israel

V500 Basic AdvOld Adv

MSc Verena Bessenbacher – Results

9© Roma, 09.2019 JM Bettems

• Main findings• All TERRA configurations exhibit similar performances,

no major differences between different target areas• All v5.05 TERRA configurations perform reasonably

(in particular no significant soil drying in advanced v5.05 … unlike what was observed at DWD)• Advanced v5.05 TERRA configuration is worse over Eu, better over Ru (in the night)• Decreased performance of TERRA (fluxes) with increased vegetation density

• Superior CLM fluxes do not translate into improved near surface temperature(model tuning targets TERRA, compensation of old aerosol climatology errors only in TERRA)

• Potential for model performance improvements through use of skin conductivity scheme (itype_canopy=2) and improved bare-soil evaporation (itype_evsl=4)(not tested in PT!)

• Some PTL recommendations for the COSMO community:• Verifying over several domains is highly recommended• A common robust verification package for the community is definitely needed

• Soil and surface fluxes verification is crucial to better understand physical processes

Findings & Recommendations