CAVE Data Info &
Validation Results |
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Radiation Transfer
'on-line' models |
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The image below locates the 84 grid boxes where surface observations are made available for comparison
to CERES SYN-1Degree surface data products. The tool below gives the months of available surface observation data
for each site. CERES SYN-1Degree data is complete from Mar 2000 through current processing (~mid 2013).
Data
The CERES SYN-1Degree Edition-3 (SYN-1Deg) data product is a 4 dimensional gridded model product
developed by the CERES science team to model the global atmospheric radiation budget at multiple
time and space scales. The product has a spatial resolution of 1 Degree lat/lon, a minimum temporal
resolution of 3 hours and is archived at the Top of Atmosphere (TOA), the surface, and 3 levels in
the atmosphere. (The radiation transfer code is run at a higher vertical resolution.)
Data subset from the SYN-1Deg and made available here for comparisons to surface observations are:
SYN-1Deg Surface Irradiance Calculations Available for Matching* Surface Observations
- Shortwave Irradiance Down
- Shortwave Direct Normal Down
- Shortwave Diffuse Down
- Shortwave Irradiance Up
- Longwave Irradiance Down
- Longwave Irradiance Up
Surface Meteorological Observations* with Matching SYN-1Deg Variables
- Aerosol Optical Depth at 500nm
- Cloud Fraction (%)
Surface Meteorological Observations* without Matching SYN-1Deg Variables
- None
(*Variables are listed for all surface sites to keep files uniform. Many surface sites
do not include all of the above variables.)
CERES SYN-1Degree Notes on Processing
Global Inputs
- Meteorological data from Goddard Modeling & Assimilation Office (GMAO) GEOS4 & GEOS5 re-analyses.
- Aerosol data from MODIS data products and MATCH Chemical Transport Model.
- Ozone from SMOBA data product.
- Surface Albedo derived from clear sky TOA observations and/or modeled across time and/or from a 'history' map updated monthly.
Spatial Resolution
- Original calculations done on approximate equal area spatial grid, 1 degree equal angle at the equator.
- Product archived on global 1-degree equal angle grid.
Temporal Resolution
- Original calculations done hourly.
- Solar zenith angle at time of calculation is the integrated value for that hour.
- Data subsequently averaged in time to 3-hourly resolution, center time is at the '1.5' hour.
Vertical Resolution
- Original radiative transfer calculations using up to 54 vertical levels.
- Data are achived at five levels: Surface, 500hPa, 200hPa, 70hPa, and Top of Atmosphere (~0.1hPa)
Radiation Transfer Model
- Uses the Langley Fu & Liou radiative transfer model.
- Correlated k for gaseous absorption.
- 18 SW bands between 0.2 & 4.0 microns, 12 LW bands between 2200cm-1 and 0cm-1
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