Requirement #94 


For variable: Downward short-wave irradiance at TOA

In application: Climate-AOPC (deprecated)

Goal Breakthrough Threshold
Uncertainty 1 W.m-2 1.3 W.m-2 2 W.m-2
Stability/decade (if applicable)
Horizontal Resolution 100 km 200 km 500 km
Vertical Resolution
Observing Cycle 3 d 4 d 6 d
Timeliness 3 d 7 d 24 d


Validated: 7/19/07 Source: AOPC
Comment: See Hansen et L. (1995) in T.R. Karl (Ed.) 1995 Long term climate monitoring by GCOS. Kluwer. Also, Climatic Change 31, Nos. 2-4. Climate forcing by strat O3, need low bias & spectrally-resolved (~1nm) solar irradiance. UV monitoring may need higher freq. Confidence: reasonable
Def: :Not firm, but based on a strong heritage of experiments with similar data