GSWP-2 MMA Monthly Fields

Note that there are two fields in the NetCDF data files for each multi-model variable: the monthly mean (with M_ before the variable name) and the inter-model standard deviation of the monthly means (with St_ before the name).

The
ALMA standard monthly mean fields for the GSWP-2 baseline simulation are listed in the table below.   The monthly data set spans 10 years (1986-1995) so 120 time steps are represented.  A text dump of the header information from one of the NetCDF flies is provided as well.

GrADS-Data Server (GDS; DODS/OPeNDAP compliant) access to the monthly data.

The sign convention shown is traditional meteorological convention. See
http://www.lmd.jussieu.fr/ALMA/ for a detailed discussion of these variables.

Because different LSSs have different vertical discretizations of soil layers, soil moisture and temperature have been interpolated to a common profile of six layers with thicknesses of 0.1, 0.2, 0.2, 0.2, 0.3 and 0.5m, for a total depth of 1.5m.


Variable

Description

Units

Sign (+)

O.1) General energy balance components



Swnet

Net shortwave radiation

W m-2

Down

Lwnet

Net longwave radiation

W m-2

Down

Qle

Latent heat flux

W m-2

Up

Qh

Sensible heat flux

W m-2

Up

Qg

Ground heat flux

W m-2

Down

Qf

Energy of fusion

W m-2

Sol. to Liq.

Qv

Energy of sublimation

W m-2

Sol. to Vap.

Qa

Heat transferred to snowpack by rainfall

W m-2

Down

DelSurfHeat

Change in surface heat storage

J m-2

Incr.Heat

DelColdCont

Change in snow cold content

J m-2

Decr.Heat

O.2) General water balance components



Snowf

Snowfall rate

kg m-2 s-1

Down

Rainf

Rainfall rate

kg m-2 s-1

Down

Evap

Total evapotranspiration (all terms)

kg m-2 s-1

Up

Qs

Surface runoff

kg m-2 s-1

Out

Qsb

Subsurface runoff

kg m-2 s-1

Out

Qsm

Snowmelt

kg m-2 s-1

Sol. to Liq.

Qfz

Refreezing of water in the snowpack

kg m-2 s-1

Liq. to Sol.

Qst

Water flowing out of snowpack

kg m-2 s-1

Out

DelSoilMoist

Change in column soil moisture

kg m-2

Increase

DelSWE

Change in snow water equivalent

kg m-2

Increase

DelIntercept

Change in canopy interception storage

kg m-2

Increase

O.3) Surface state variables



SnowT

Snow surface temperature

K

Pos.Def.

VegT

Vegetation canopy temperature

K

Pos.Def.

BaresoilT

Bare soil surface temperature

K

Pos.Def.

AvgSurfT

Area-weighted average surface temperature

K

Pos.Def.

RadT

Effective surface radiative temperature

K

Pos.Def.

Albedo

Surface albedo

-

Pos.Def.

SWE

Snow water equivalent on ground

kg m-2

Pos.Def.

SWEVeg

Snow water equivalent in canopy interception

kg m-2

Pos.Def.

O.4) Subsurface state variables



SoilMoist

Average layer soil moisture (6 layers)

kg m-2

Pos.Def.

SoilTemp

Average layer soil temperature (6 layers)

K

Pos.Def.

SoilWet

Total column soil wetness (wilting point = 0, saturation = 1)

-

> wilting point

NormDeepSoilWet

Normalized column soil wetness (0.0-1.0m)

Std.dev.

Pos.Anomaly

NormSurfSoilWet

Normalized surface soil wetness (0.0-0.1m)

Std.dev.

Pos.Anomaly

O.5) Evaporation components



PotEvap

Potential evapotranspiration

kg m-2 s-1

Up

Ecanop

Evaporation of canopy interception

kg m-2 s-1

Up

Tveg

Vegetation transpiration

kg m-2 s-1

Up

Esoil

Bare soil evaporation

kg m-2 s-1

Up

RootMoist

Root zone soil moisture

kg m-2

Pos.Def.

CanopInt

Total canopy water storage

kg m-2

Pos.Def.

SubSnow

Snow sublimation

kg m-2 s-1

Up

SubSurf

Sublimation of ice from soil and canopy interception

kg m-2 s-1

Up

Acond

Aerodynamic conductance

m s-1

Pos.Def.

Ccond

Canopy (stomatal) conductance

m s-1

Pos.Def.

O.6) Other hydrologic variables



WaterTableD

Depth to water table

m

Pos.Def.

O.7) Cold season processes



SnowFrac

Snow cover fraction

-

Pos.Def.

SAlbedo

Snow albedo

-

Pos.Def.

SnowDepth

Depth of snow

m

Pos.Def.

O.8) Variables to be compared with remotely sensed data



RadTmax

Maximum daily radiative surface temperature

K

Pos.Def.

RadTmin

Minimum daily radiative surface temperature

K

Pos.Def.