We put in 4 standard radiative forcings (volcanic,
block, single and predicting),
described below and the possibility of editing your own forcing (editing).
Explosive volcanic eruptions
lead to the formation of stratospheric dust layers consisting of small aerosols.
These dust layers remain in the stratosphere for 1 or 2 year, reflect sunlight
and produce a negative radiative forcing which cools the earth surface. Van
Ulden and van Dorland reconstructed the radiative forcing due to major volcanic
eruptions from various observations and historic data. Van Ulden and van Dorland
used volcanic eruptions where SO2 was liberated, reducing the
radiative forcing in the atmosphere. In the period from 1850 to 1999, one may
recognize the eruption of the Krakatao in 1883 and of Pinatubo in 1991 . The negative forcing was
calculated using historic data, and shown in the top graph. The resulting
negative temperature pulses are shown in the bottom graph. One observes that the
pulses propagate slowly to the lower layers and smoothen out as well.
A simple pulse in order to observe the behaviour of the
water temperatures
A single Gaussian pulse
When the radiative forcing increases like an
exponential one may observe the subsequent temperatures
The most simple forcing is the constant straight line
(type in A=0 and B=1). This forcing should eventually lead to a temperature
increase of 0.6 K. On the given time scale of 100 years this does not happen.
One may however type in an own time scale as e.g. 10 000 years. Then it indeed
converges. One also observes that at first the top and bottom layer heat up (because
of the downwelling connecting both), while eventually all layers heat up in the
order from top to bottom.