Output Variables

This table is here for discussion. This is not any kind of "official" way to obtain CORDEX variables from WRF

This is a summary of variables to be contributed to CORDEX (notice that the African domain has some additional variables/frequencies defined) as requested in the Description of the CORDEX archival procedure. This is a first draft on how to obtain them from the WRF output variables. Notice that many variables require their activation in the registry. The abbreviations under IPCC-abbr are only suggested names. We are not aware of official naming conventions regarding variables.

Surface

#core

#tier

variable name

IPCC-abbr

freq

units

WRF variable

comments

1

1

2-meter temperature

tas

MOM, SEM, DAM, 03H

K

T2

2

2

Daily maximum 2-m temperature

tasmax

MOM, SEM, DAM

K

T2 or T2MAXclwrf

MAX

3

3

Daily minimum 2-m temperature

tasmin

MOM, SEM, DAM

K

T2 or T2MINclwrf

MIN

4

4

Precipitation

pr

MOM, SEM, DAM, 03H

kg m-2 s-1

RAINC+RAINNC

dt(RAINC+RAINNC)/DT

5

Surface pressure

ps

DAM, 03H

Pa

PSFC

5

6

Mean sea level pressure

psl

MOM, SEM, DAM, 03H

Pa

PSFC, HGT, QVAPOR, PH, PHB

6

7

2-meter specific humidity

huss

MOM, SEM, DAM, 03H

1

Q2

Q2 / ( 1 + Q2)

7

8

Daily 10-meter wind speed

wspd

MOM, SEM, DAM, 03H

m s-1

U10,V10

WIND=SQRT(U102+V102)

8

9

Daily maximum 10-meter wind speed

wssmax

MOM, SEM, DAM

m s-1

U10,V10 or U10MAXclwrf ,V10MAXclwrf

MAX(WIND)

9

10

Total cloudiness (Fraction)

clt

MOM, SEM, DAM, 03H

%a

CLDFRA

1 UNKNOWN

10

11

Sunshine duration

sund

MOM, SEM, DAM, 03H

s

SWDOWN or SUNSHINEclwrf

>= 120 W m-2

11

12

Downward SW surface radiation

rsds

MOM, SEM, DAM, 03H

W m-2

ACSWDNB

dtACSWDNB/DT

12

13

Downward LW surface radiation

rlds

MOM, SEM, DAM, 03H

W m-2

ACLWDNB

dtACLWDNB/DT

13

14

Upward latent heat flux at surface

hfls

MOM, SEM, DAM, 03H

W m-2

ACLHF

dtACLHF/DT

14

15

Upward sensible heat flux at surface

hfss

MOM, SEM, DAM, 03H

W m-2

ACHFX

dtACHFX/DT

15

16

Upwelling Surface Shortwave Radiation

rsus

MOM, SEM, DAM, 03H

W m-2

ACSWUPB

dtACSWUPB/DT

16

17

Upwelling Surface Longwave Radiation

rlus

MOM, SEM, DAM, 03H

W m-2

ACLWUPB

dtACLWUPB/DT

17

18

Surface Evaporation

evspsbl

MOM, SEM, DAM, 06H

kg m-2 s-1

SFCEVP

dtSFCEVP/DT

19

Potential evapotranspiration

evspsblpot

DAM, 06H

kg m-2 s-1

UNKNOWN

18

20

Soil frozen water content

mrfso

MOM, SEM, DAM, 06H

mb

TSLB, SMOIS, SH2O

Assume frozen water below a threshold TSLB?

19

21

Surface runoff

mrros

MOM, SEM, DAM, 06H

kg m-2 s-1

SFROFF

SFROFF/DT

20

22

Subsurface runoff

mross

MOM, SEM, DAM, 06H

kg m-2 s-1

UDROFF

UDROFF/DT

21

23

Total soil moisture content

mrso

MOM, SEM, DAM, 06H

kg m-2

SMSTOT, DZS

SMSTOT*1000*SUM(DZS)

22

24

Snow depth

snd

MOM, SEM, DAM, 06H

m

SNOWH

23

25

Snow melt

snm

MOM, SEM, DAM, 06H

kg m-2 s-1

ACSNOM

dtACSNOM/DT

26

Max hourly precipitation rate

prhmax

DAM

kg m-2 s-1

RAINC, RAINNC or RAINMAX1Hclwrf

MAX(dtsum()/DT)

27

Convective precipitation

prc

DAM, 06H

kg m-2 s-1

RAINC

dtRAINC / DT

24

28

TOA outgoing Longwave radiation

rlut

MOM, SEM, DAM, 06H

W m-2

ACLWUPT

dtACLWUPT / DT

25

29

TOA incident Shortwave radiation

rsdt

MOM, SEM, DAM, 06H

W m-2

ACSWDNT

dtACSWDNT / DT

26

30

TOA outgoing Shortwave radiation

rsut

MOM, SEM, DAM, 06H

W m-2

ACSWUPT

dtACSWUPT / DT

27

31

10-meter U wind

uas

MOM, SEM, DAM, 06H

m s-1

U10, V10, SINA, COSA

EarthRotated

28

32

10-meter V wind

vas

MOM, SEM, DAM, 06H

m s-1

U10, V10, SINA, COSA

EarthRotated

33

Maximum 10 m wind gust

(wgsmax)

DAM

m s-1

WINDGUSTMAX

Work in progress in CLWRF

34

Surface Downward Flux of Eastward Momentum

(tauus)

DAM, 06H

kg m s-1 m-2

UNKNOWN

35

Surface Downward Flux of Northward Momentum

(tauvs)

DAM, 06H

kg m s-1 m-2

UNKNOWN

36

Surface skin temperature

ts

DAM, 06H

K

TSK

37

Atmospheric Boundary layer thickness

zmla

DAM, 06H

m

PBLH

38

Column water vapour content

prw

DAM, 06H

mb

QVAPOR, MU, MUB, DNW

vertical-Integration2

39

Column liquid water content

(cllwvi)

DAM, 06H

mb

QCLOUD, MU, MUB, DNW

Vertical-Integration2

40

Column Ice water vapour content

clivi

DAM, 06H

mb

QICE, MU, MUB, DNW

Vertical-Integration2

53

High clouds

clisccpH

DAM, 06H

%a

CLDFRA

p< 440 hPa

54

Medium clouds

clisccpM

DAM, 06H

%a

CLDFRA

660 < p< 440 hPa

55

Low clouds

clisccpL

DAM, 06H

%a

CLDFRA

p> 660 hPa

NOTES:

3D

#core

#tier1

variable name

IPCC-abbr

freq

units

levels

WRF variable

comments

29,33,37

41, 45, 49

Eastward Wind

ua

MOM, SEM, DAM

m s-1

850, 500, 200

U, V, SINA, COSA

EarthRotated

30,34,38

42, 46, 50

Northward Wind

va

MOM, SEM, DAM

m s-1

850, 500, 200

U, V, SINA, COSA

EarthRotated

31,36,39

43, 48, 51

air temperature

ta

MOM, SEM, DAM

K

850, 500, 200

T, P, PB

(T+300)*((P+PB)/P0)kappa c

32

44

Specific humidity

hus

MOM, SEM, DAM

1

850

QVAPOR

QVAPOR / (1 + QVAPOR)

40

47

Geopotential height

zg

MOM, SEM, DAM

m

200

PH, PHB

sum() / 9.81

c kappa as Poisson constant of dry air (Rd/Cpd)

Fixed fields

From 'geo_em' file:

#

variable name

IPCC-abbr

units

WRF variable

comments

Orography

orog

m

HGT_M

Land Area Fraction

sftlf

1

LANDMASK

Land use

lco

LU_INDEX