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HOME > iTacs (Interactive Tool for Analysis of the Climate System) > List of datasets and elements available on iTacs

List of datasets and elements available on iTacs

Users can use two types of datasets, analysis dataset and forecast one on iTacs.

The analysis dataset consists of re-analysis and observational data such as the Japanese 55-year reanalysis (JRA-55) data, outgoing longwave radiation (OLR) provided by NOAA, sea surface temperature analysis (COBE-SST) data, world climate data from surface observation stations (CLIMAT reports). The forecast dataset consists of JMA's one-month prediction model products and re-forecast (hind-cast) dataset.

The datasets and its elements available on iTacs are listed as below.

Analysis dataset

Dataset Element Unit
JRA-55 Pressure Levels χ (Velocity potential) 106 m2/s
Div (Relative divergence) 1/s
θe (Equivalent potential temperature) K
ω (Pressure vertical velocity) Pa/s
ψ (Stream function) 106 m2/s
θ (Potential temperature) K
q (Specific humidity) kg/kg
T (Temperature) °C
T-Td (Dew point depression) °C
U (Zonal wind) m/s
V (Meridional wind) m/s
Udiv (Zonal divergence wind) m/s
Vdiv (Meridional divergence wind) m/s
ζ (Relative vorticity) 1/s
γ (Geopotential height) m
EGR (Maximum growth rate in the Eady problem) 1/day
KE (Kinetic energy of high-frequency variation) m2/s2
Flux Waf-xc (Calculate zonal wave activity flux) m2/s2
Waf-yc (Calculate meridional wave activity flux) m2/s2
Waf-zc (Calculate vertical wave activity flux) Pa m/s2
Wvf-x (Zonal water vapor flux) kg/kg m/s
Wvf-y (Meridional water vapor flux) kg/kg m/s
U'V' (Momentum flux by eddies) m2/s2
V'T' (Heat flux by eddies) K m/s
Surface SLP (Sea level pressure) hPa
Ps (Surface pressure) hPa
qs (Surface specific humidity) kg/kg
Ts (Surface temperature) °C
T-Td (Surface 2-m dew point depression) °C
Us (Surface zonal wind) m/s
Vs (Surface meridional wind) m/s
Tprat (Surface total precipitation) mm/day
Latent heat flux (positive: upward) W/m2
Sensible heat flux (positive: upward) W/m2
Solar radiation flux (positive: upward) W/m2
Longwave radiation flux (positive: upward) W/m2
Net heat and radiation flux (positive: upward) W/m2
Isentropic Levels Potential vorticity PVU (10-6 K m2/kg/s)
Zonal wind m/s
Meridional wind m/s
Vertical wind Pa/s
SAT Outgoing Longwave Radiation (OLR) W/m2
SST Sea Surface Data Temperature (SST) °C
Ice concentration
MOVE-G2 d20-OHC 20°C depth m
OHC (vertical averaged temperature over top 300m) °C
Thermohaline-3D Potential temperature °C
Salinity psu
Thermohaline-2D Potential temperature at BBL °C
Salinity at BBL psu
Sea surface height cm
Short wave radiation W/m2
Long wave radiation W/m2
Latent heat flux W/m2
Sensible heat flux W/m2
Heat flux w/o short wave radiation W/m2
Fresh water flux cm/s
Salt flux for restoring psu cm/s
Sea ice thickness m
Snow depth m
Ice concentration
Sea-ice surface temperature °C
Current-3D Eastward velocity cm/s
Northward velocity cm/s
Current-2D Eastward velocity at BBL cm/s
Northward velocity at BBL cm/s
Eastward component of surface wind stress N/m2
Northward component of surface wind stress N/m2
Eastward component of surface stress N/m2
Northward component of surface stress N/m2
Eastward velocity of ice m/s
Northward velocity of ice m/s
Ice concentration in UV-box
CLIMAT T (Temperature) °C
Tx (Maximum Temperature) °C
Tm (Minimum Temperature) °C
Rain (Precipitation) mm
INDEX NINO.1+2
NINO.3
NINO.3.4
NINO.4
NINO.WEST
IOBW
CONST Constant fields of JRA-55 Land masking (Land:0, Sea:1)
Sea masking (Land:1, Sea:0)
Topographic height m

Forecast dataset

Dataset Element Unit
1MONTH_ENS_MEAN Pressure Levels χ (Velocity potential) 106 m2/s
ψ (Stream function) 106 m2/s
T (Temperature) °C
T-Td (Dew point depression) °C
U (Zonal wind) m/s
V (Meridional wind) m/s
γ (Geopotential height) m
Surface SLP (Sea level pressure) hPa
Ts (Surface temperature) °C
Rain (Daily Precipitation) mm/day
1MONTH_HIND Pressure Levels Velocity potential 106 m2/s
Stream function 106 m2/s
Geopotential height m
Relative humidity %
Temperature °C
Dew point depression °C
Zonal wind m/s
Meridional wind m/s
Surface Surface temperature °C
Surface pressure hPa
Rain mm/day


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