This is part of the labels / documentation for <a href='http://jcm.chooseclimate.org'>Java Climate Model</a><hr/>

#fgasplot		¨oldJCM4		§£>fgas

#fgases		¨oldJCM4		§---- ===Source, lifetime, effect on ozone ===
  These gases (also known as freons, halocarbons etc.) are entirely anthropogenic (except CCl4). They were manufactured specifically because they are inert (unreactive) in the troposphere. The CFCs, HCFCs, HFCs etc. were developed mainly as propellants and refrigerants. SF6 is used mainly during the manufacture of silicon chips.

However, this inert nature gives them a long lifetime in the atmosphere, allowing enough time to reach the stratosphere where vertical mixing is very slow. There, they are split by intense u.v. radiation, and the chlorine atoms in CFCs and HCFCs are released, catalysing the destruction of the stratospheric ozone layer.

HCFCs were considered slightly better than CFCs, as the hydrogen atom makes them more vulnerable to reaction in the troposphere, so they have a shorter lifetime and fewer molecules make it to the stratosphere. Nevertheless HCFCs also destroy ozone, and production of both CFCs and HCFCs are now limited by the Montreal protocol.

The global average radiative forcing from these gases is partially offset by the reduction of stratospheric ozone, which is also a greenhouse gas. Howevever, beware that the spatial and temporal distributions of these forcings are different.
%%(see @radfordistrib)%% 

  HCFCs are now being replaced by HFCs, which do not destroy ozone but are still powerful greenhouse gases. Some of the SRES scenarios (e.g. A1T) anticipate increasing production of these gases, although they are included in the Kyoto protocol "basket" of greenhouse gases.

The pure F gases CF4, C2F6 and SF6 (green on @fgasplot panel) are even more inert and have atmospheric lifetimes of thousands of years. CFC12 also has a lifetime of several centuries. You can see this, by switching from emissions to concentration. Emissions of CF4 and SF6 are quite modest, but their concentrations are relatively larger due to accumulation. SF6 also has a particularly high radiative forcing per molecule.

  ---- ===Changing emissions and lifetime===
  The emissions show the transition in manufacture of these gases, from CFCs to HCFCs to HFCs (from blue to pink to brown on @fgasplot panel)

For the gases controlled by the Montreal protocol (CFCs, HCFCs), the concentrations are prescribed according to WMO data, the same for all scenarios.

The emissions of the other gases are dependent on the SRES scenario (SRES menu, top bar). They may also be scaled to the CO2 mitigation, depending on which option you choose from  @othgasemit

The atmospheric lifetime of each HFCs is also dependent on the concentration of reactive hydroxy radicals (OH), which is itself dependent on the concentration of CO, NOx, VOx and CH4. So adjusting emissions of these gases will also affect HFC concentrations slightly. These atmospheric chemistry interactions are explained in  @atchem.
  The total radiative forcing from CFCs and HFCs may be seen on @othgasplot and @radforplot  (expert level).

#eescl		¨oldJCM4		§This shows the effect of  stratospheric ozone depletion caused by ClFCs. Since ozone is a greenhouse gas, it gives a negative radiative forcing