Surface energy budget, all sky
and the Physical Science Basis
Stephens and L'Ecuyer (2015) Atmospheric Research
our additions in textboxes and a mini-diagram from Stephens et al. (2012)
344 + 163 = 399 + 82 + 26 = 507 = 2 × 240 + 26.6 + 0.4
downward longwave radiation + surface absorbed solar radiation =
upward longwave radiation + evaporation + sensible heat =
2OLR + LWCRE (+ IMB)
CERES EBAF Ed4.0 prototype data:
SW down - SW up + LW down = 2 x OLR(all) + LW CRE
184.0 - 22.5 + 347.1 = 508.6 = 2 x 240.1 + 28.4
CERES EBAF DATA, CLIMATE YEAR
CERES DATA 2001 - 2015
ULW, OLR(all), f(all)
The Physical Science Basis
Our atmosphere is close to be opaque in the longwave:
it absorbs almost all of the surface upward emission (374/396 ~ 14/15),
and only a small part (22/396) is lost in space
through the Atmospheric Windwow.
This ~1/15 is gained back by the LW effect of clouds.
As a result, our cloudy atmosphere works as a 'closed glass shell':
it lets the sunshine in, but blocks terrestrial radiation entirely.
The 'closed shell model' is described in textbooks as
the simplest greenhouse model, where the sum of the surface energy flows is
twice the radiation of the shell, simply from geometric reasons:
The Earth's wet, cloudy surface-atmospheric system,
contrary to all the evident differences, follows this simplest model.
Where opaque, cavity.
Where transparent, leaky.
The results in several '2OLR' -like relationships in the energy budgets
and an integer pattern in the energy flows, modulated by LWCRE.