CERES EBAF Net Balancing
EBAF Net Balance
- CERES product TOA fluxes have a positive net imbalance, due mainly to the CERES instrument absolute calibration
- The CERES EBAF-TOA
product was designed for climate modelers that need a net imbalance constrained to the ocean heat storage term
(Hansen et al. 2005)
- CERES also uses the observed SORCE incoming solar fluxes
(Koop et al. 2005),
which has solar constant of 1361.0
- CERES performed a flux uncertainty analysis and determined that the CERES instrument calibration
was the largest uncertainty at 2% for the SW and 1% for LW.
- More information can be found in the
EBAF-TOA Data Quality Summary (DQS)
Comparison of ERBElike, SSF1deg, SYN1deg, and EBAF fluxes
|TOA fluxes (Wm-2)
CERES Net flux uncertainty analysis
Net flux sensitivity (αi), standard deviation of error (σi),
maximum likelihood error (xi), and error effect on net TOA flux.
||Net TOA Flux
sensitivity, αi (W/m2/%)
|2σ uncertainty, δi (%)
solution, xi (%)
|SW radiance to flux||-0.977||0.20||0.017||0.02|
|LW radiance to flux||-2.37||0.13||0.016||0.04|
|Reference Level, SW||-0.977||0.10||0.004||0.00|
|Reference Level, LW||-2.37||0.08||0.007||0.02|
|Total SW|| || || ||1.7|
|Total LW|| || || ||2.5|
|Total Net|| || || ||-4.2|
- Note the SW and LW gains or instrument absolute calibration have
the highest uncertainty and largest corresponding TOA flux adjustment
CERES Earth's Radiation Budget
- For the Earth to remain in balance the energy coming into and leaving the Earth must equal.
- The CERES absolute instrument calibration currently does not have zero net balance and must be
adjusted to balance the Earth's energy budget.
- After the EBAF adjustment the CERES fluxes may be used in climate models for climate model evaluation,
estimating the Earth's global mean energy budget and to infer meridional heat transport.
CERES Data Product Information