Since C14 has different absorption bands from C12, and is further from optical saturation, an increase in C14 proportion probably has a small global warming effect. However, the concentration of C14 in nature is only one part per trillion.( http://en.wikipedia.org/wiki/Carbon-14 ) Doubling this with bombs (which apparently did happen at about the 1965 peak) will have no appreciable radiative effect; it will amount to something less than a millionth part of the global warming from anthropogenic CO2.
The local cooling from the dust from explosion will greatly outweigh any climate effect from this quantity of C14, which for optical purposes is tiny. mt On 5/15/07, santi <[EMAIL PROTECTED]> wrote: > > well, the nuclear tests did not have clear impact on the climate, at > least in a long run, but they had strong impact on the proportions of > the radionuclides present in the atmosphere ... the C14 was one of the > most affected. the thermonuclear bombs added large quantities of 14C > to the atmosphere, mainly during the 1955-1963 period. > you can see evolution of the 14C on the atmosphere here: > http://www.iup.uni-heidelberg.de/institut/forschung/groups/kk/en/14CO2_html > on direct consequence is that the atmosphere now has an apparent age > of about 70 years in the future. > you can find more info on this > here: > http://www.ingentaconnect.com/content/arizona/rdc/2004/00000046/00000003/art00019 > Discussion: Reporting and Calibration of Post-Bomb14C Data > Authors: Reimer, Paula J.; Brown, Thomas A.; Reimer, Ron W. > Source: Radiocarbon, Volume 46, Issue 3, Pages v-1334 (March 2004), > pp. 1299-1304(6) > > and here: > http://www.ingentaconnect.com/content/arizona/rdc/2004/00000046/00000003/art00018 > Review of Tropospheric Bomb 14C Data for Carbon Cycle Modeling and > age Calibration Purposes > Authors: Hua, Quan; Barbetti, Mike > Source: Radiocarbon, Volume 46, Issue 3, Pages v-1334 (March 2004), > pp. 1273-1298(26) > > i hope that this helps. > > > > I am sure I should know this, but finding sources has proven to be > > almost impossible. > > > > What effect, if any, did the atmospheric nuclear tests of 1947-63 have > > on the climate? > > > > Would the large scale emission of C14 have had any impact? > > > > Where can I find the information or papers on this? > > > > Call for help, really; I'm stuck... > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups Global Change ("globalchange") newsgroup. Global Change is a public, moderated venue for discussion of science, technology, economics and policy dimensions of global environmental change. Posts will be admitted to the list if and only if any moderator finds the submission to be constructive and/or interesting, on topic, and not gratuitously rude. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/globalchange -~----------~----~----~----~------~----~------~--~---
