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CERES SYN/AVG/ZAVG Product Information

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SYN/AVG/ZAVG Documentation

  • Data Quality Summary link to external site — Highlights the accuracy of this product as determined by the CERES Science Team.

SYN/AVG/ZAVG Product Features

  • The Synoptic Radiative Fluxes and Clouds (SYN) product contains a day of space and time averaged Clouds and the Earth's Radiant Energy System (CERES) data for a single scanner instrument.
  • The 1-degree regional flux at the hour of observation from the CERES FSW product and concurrent diurnal data from geostationary satellites are used to estimate the regional flux at 3-hour GMT based intervals.
  • Also at 3-hour intervals are estimates of the adjusted (tuned) fluxes at the five atmospheric levels as defined by the CERES CRS product for both clear-sky and total-sky scenes, estimates of the average cloud parameters in four cloud height categories, and averaged cloud parameters.
  • The SYN contains the following apriori and observed input:
    • Regional data
    • Cloud category properties for four (low, lower middle, upper middle and high) cloud layers
    • Observed CERES TOA clear-sky and all-sky fluxes
    • MODIS based spectral aerosol optical depths
  • The SYN contains the following constrained (tuned) vertical flux profiles for both clear-sky and total-sky conditions evaluated at the TOA, 70mb, 200mb, 500mb, and surface:
    • Longwave, Shortwave, and Window channels upward and downward.
  • The constrained (tuned) and initial (untuned) profiles for the following are included for pristine (clear-sky no-aerosol), clear-sky, total-sky-no-aerosol, and total-sky conditions:
    • Longwave upward at the surface and TOA.
    • Longwave downward at the surface.
    • Shortwave upward at the surface and TOA.
    • Shortwave downward at the surface.
    • Window channel upward at the surface and TOA.
    • Window channel downward at the surface.
  • The adjustments to the radiative transfer model input parameters between the initial and the constrained (adjusted) passes are also contained on the SYN. These parameters include:
    • Surface albedo and skin temperature
    • Total column precipitable water, upper tropospheric relative humidity, and column ozone
    • Aerosol optical depth
    • Cloud optical depth, fractional area, and effective temperature
  • The SYN contains the direct and diffuse shortwave surface fluxes for total-sky, clear-sky, pristine and actinic conditions.
  • The SYN also contains surface UVA and UVB downwelling and direct diffuse ratios for total-sky, clear-sky, pristine, and total-sky-no-aerosol conditions.
  • The monthly Regional Radiative Fluxes and Clouds (AVG) product contains monthly and monthly 3-hourly averages of the Synoptic Radiative Fluxes and Clouds (SYN) product.
  • The monthly Zonal and Global Radiative Fluxes and Clouds (ZAVG) product are the zonal and global averages of the monthly Regional Radiative and Clouds (AVG) product.

SYN/AVG/ZAVG Processing Flowchart

Image: SYN-AVG-ZAVG Processing Flowchart

SYN/AVG/ZAVG Product Parameters

TOA Fluxes
(observed & computed)
Surface Fluxes
In-Atmospheric Fluxes
Cloud Properties
[Diurnally Complete]
Auxiliary Data
  • Shortwave Flux
  • Longwave Flux
  • Window-region Flux
  • Downwelling UVA & UVB Fluxes
    (computed only)
  • Downwelling PAR Flux
    (computed only)
  • Shortwave Flux - Up
  • Longwave Flux - Up
  • Window-region Flux - Up
  • Shortwave Flux - Down
  • Longwave Flux - Down
  • Window-region Flux - Down
  • Surface Albedo
  • Shortwave Direct/Diffuse Fluxes
  • UVA & UVB Fluxes
  • PAR Direct/Diffuse Fluxes
  • Shortwave Flux - Up
  • Longwave Flux - Up
  • Window-region Flux - Up
  • Shortwave Flux - Down
  • Longwave Flux - Down
  • Window-region Flux - Down
  • Cloud Area Fraction
  • Cloud Effective Pressure
  • Cloud Effective Temperature
  • Cloud Effective Height
  • Cloud Top Pressure
  • Cloud Base Pressure
  • Cloud Particle Phase
  • Liquid Water Path
  • Ice Water Path
  • Water Particle Radius
  • Ice Particle Effective Diameter
  • Cloud Visible Optical Depth
  • MATCH Total Aerosol Optical Depth @ 0.55µm
  • MODIS Aerosol Optical Depths over Land & Ocean
  • Surface Type Percent Coverage
  • Skin Temperature
  • Total Column Precipitable Water
  • Upper Tropospheric Precipitable Water
  • Column Ozone

SYN/AVG/ZAVG Spatial and Temporal Resolutions

  Spatial Resolutions
Regional grid
(1°x1° latitude by longitude)
Zonal grid
(1° latitude)
Monthly 3-Hourly AVG ZAVG ZAVG
3-Hourly SYN N/A N/A

SYN/AVG/ZAVG Product Availability

SYN/AVG/ZAVG Product Processing Status ( by year / by month / by product edition)
Product Sat
Level 3
SYN Terra
AVG Terra
ZAVG Terra
2000 2001 2002 2003 2004 2005
Level 3
Mar Terra SYN 2000 Available   Terra SYN 2001 Available   Terra SYN 2002 Available   Terra SYN 2003 Available   Terra SYN 2004 Available Oct Terra SYN 2005 Available
 Aqua SYN 2000 Not Available  Aqua SYN 2001 Not Available Jul Aqua SYN 2002 Available   Aqua SYN 2003 Available   Aqua SYN 2004 Available Oct Aqua SYN 2005 Available
Mar Terra AVG 2000 Available   Terra AVG 2001 Available   Terra AVG 2002 Available   Terra AVG 2003 Available   Terra AVG 2004 Available Oct Terra AVG 2005 Available
 Aqua AVG 2000 Not Available  Aqua AVG 2001 Not Available Jul Aqua AVG 2002 Available   Aqua AVG 2003 Available   Aqua AVG 2004 Available Oct Aqua AVG 2005 Available
Mar Terra ZAVG 2000 Available   Terra ZAVG 2001 Available   Terra ZAVG 2002 Available   Terra ZAVG 2003 Available   Terra ZAVG 2004 Available Oct Terra ZAVG 2005 Available
 Aqua ZAVG 2000 Not Available  Aqua ZAVG 2001 Not Available Jul Aqua ZAVG 2002 Available   Aqua ZAVG 2003 Available   Aqua ZAVG 2004 Available Oct Aqua ZAVG 2005 Available

 Terra Available  Aqua Available  S-NPP Available  J01 Available
 Combined (Terra+Aqua)  Combined (Terra+NPP)  Not Available (odd rows)  Not Available (even rows)

  • By clicking on "by month", a more detailed table will be rendered with the ability to click on specific months for daily and hourly Level 2 and Level 1B products.
  • By clicking on "by product edition", a more detailed table will be rendered with the versions of the product available.

CERES Instrument Temporal Coverage
Spacecraft Instrument(s) Launch Date Start Date End Date
TRMM PFM 11/27/1997 12/27/1997 05/29/2001
Terra FM1 & FM2 12/18/1999 02/25/2000 Still in operation
Aqua FM3 & FM4 05/04/2002 06/19/2002 Still in operation
S-NPP FM5 10/28/2011 01/27/2012 Still in operation
J01 FM6 11/18/2017 01/6/2018 Still in operation

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Page Curator: Edward Kizer
Page Last Modified: 11/01/2019 15:43:36 EST
Site Last Modified: 11/01/2019 15:44:53 EST