SBDART WebTool (and MatLab Tool)

SBDART: Tool for Computing Radiative Transfer in the Earth's Atmosphere
WebTool written by Paul Schou, Released on 18 Dec 2007. Current version: 1.04
Based on the UCSB SBDART code by Paul Ricchiazzi et al., 1998. Other points of contact regarding SBDART are Bill O'Hirok and Catherine Gautier.

You need to have Java 1.3 or better to view this applet.

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[ INPUT file generator: Current , Memory 1 , Memory 2 , Memory 3 , Memory 4 ]

Solar Flux & Filter Database
Output Dataset:
Spectral Database NF:
Model Atmosphere IDATM:
Filter Function ISAT:
Lower wavelength limit WLINF: μm
Upper wavelength limit WLSUP: μm
Spectral resolution WLINC:
Y Maximum: W/m2 or K
Y Minimum: W/m2 or K
Y Unit:
Note: this applet will only plot 20,000 points.
BOT and TOP altitude points (km) ZOUT:
Solar zenith angle SZA: deg (default: 0)
Solar azimuth angle SAZA: deg (default: 0)
Cosine of solar zenith angle CSZA: deg (default: -1)
Solar Distance Factor SOLFAC: (default: 1)
Date & Location
This section is ignored if iday is not set
IDay (day of year, today: 106)
Time: hours
Latitude: Longitude:
(Unknown City?), (Unknown Country?) (XX)
Altitude of cloud layers (km) ZCLOUD:
Optical thickness of cloud layers TCLOUD:
Cloud drop effective radius NRE: μm
Phase function model used in cloud layers

NZ layers:
(up to 5 different layers may be specified)
Number of layers NZ:
Liquid water path LWP: (g/m2)
Effective radius of liquid water RE: μm
Frozen water path FWP: (g/m2)
Effective radius of frozen water REI: μm
Cloud fraction in layer CLDFRAC:
Gas Properties (volume mixing ratio)
XN2: N2 (PPM, default = 781000.00 )
XO2: O2 (PPM, default = 209000.00 )
XCO2: CO2 (PPM, default = 360.00 )
XCH4: CH4 (PPM, default = 1.74 )
XN2O: N2O (PPM, default = 0.32 )
XCO: CO (PPM, default = 0.15 )
XNH3: NH3 (PPM, default = 5.0e-4)
XSO2: SO2 (PPM, default = 3.0e-4)
XNO: NO (PPM, default = 3.0e-4)
XHNO3: HNO3 (PPM, default = 5.0e-5)
XNO2: NO2 (PPM, default = 2.3e-5)
UO3: O3 Total ozone (atm-cm)
UW: H2O Total water vapor (atm-cm)
Surface Albedo:
a spectrally uniform, surface albedo value
LOWTRAN 7 Model Specific Aerosols
stratospheric aerosol types
altitudes of stratospheric aerosol
optical depth (at 0.55 microns)
Up to 5 layer altitudes may be specified.

Boundary Layer Aerosols (BLA)

Boundary layer aerosol type selector IAER
The spectral dependence of the boundary layer RHAER
(Horizontal Path) Visibility (km) at 0.55 microns VIS
Altitude grid for custom aerosol vertical profile (km) ZBAER
Aerosol density at ZBAER altitude grid points DBAER
Vertical optical depth of boundary layer TBAER
Extinction efficiency QBAER
Wavelengths points (μm) for user defined aerosol spectral dependence (WLBAER)

Single Scattering Arrays
Single scattering albedo (used with IAER=5) WBAER (upto 48)
Asymmetry factor (used with IAER=5) GBAER (upto 48)

Legendre Phase Function
Legendre moments of the scattering phase function (PMAER)
Wavelength (Angstrom model) exponent used to extrapolate BLA
Controls phase function used for boundary layer aerosol (IMOMA)
Setting SPOWDER to true causes an extra sub-surface layer (SPOWDER)
  wbaer =0.88,0.89,0.91,0.92
  pmaer= 0.80,0.70,0.60,0.50,0.64,0.49,0.36,0.25,0.51,0.34,0.22,0.12,
Number of Streams (NSTR)
Number of Zenith angles (NZEN)
User Zenith angle (UZEN)
User Nadir angle (VZEN)
Number of phi angles (NPHI)
Azimuth angle (PHI)

These three parameters can be used to change the grid resolution of the model atmosphere

When settings have been made, press Replot just under the graph. It will say `Loading' while the simulation is being ran and the data will be plotted as soon as it is available. If there was an error, either a simulation error or a web connection error, the graph may not display. If it is a simulation error, check your inputs. If it may be the latter you may force a rerun by clicking here: .

SBDART MatLab Tool

If you would like to get the same results in MatLab try the

Click here:
MatLab Tool.

A simple yet effective MatLab interface to work with the data generated on this site. It can be used to download data and produce plots. However the MatLab tool will only work when connected to the internet and can access this page.