<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dennis, <div><br></div><div>Offhand, I don't know of any estimates of the radiative forcing of propane, but they might be out there. I suspect that the so-called "indirect" effects of propane -- which should be analogous to the indirect effects of CH4 -- will be larger than any direct radiative forcing effects. <div><br></div><div>In my lifecycle emissions model I estimate some of the indirect climate effects of propane emissions: the effect on O3, the effect on CH4, and the effect on SO4. The effect on O3 is estimated on the basis of the ozone-forming potential of propane. I also include, of course, the effect of the final oxidation to CO2. All of my estimates are very simple.<br><div><br></div><div>Best, </div><div><br></div><div><div><div><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>Mark Delucchi</div><div>Research Scientist</div><div>Institute of Transportation Studies</div><div>University of California</div><div>Davis, CA 95616</div><div><br class="khtml-block-placeholder"></div><div>www.its.ucdavis.edu/people/faculty/delucchi</div><div><a href="mailto:madelucchi@ucdavis.edu">madelucchi@ucdavis.edu</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span><br class="Apple-interchange-newline"> </div><br><div><div>On Jul 16, 2008, at 3:52 PM, Dennis O'Regan wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I am doing some research that involves GHGs due to propane production and use.<span class="Apple-converted-space"> </span>I have been trying to find information on the possible radiative forcing of propane emissions, not unlike the radiative forcing of CH4, but so far I have not found any information. I know that propane is not one of the six IPCC families of gases and its oxidation simply yields CO2.<span class="Apple-converted-space"> </span>But the IPCC being silent on it does not answer the question.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">A couple of questions: (1) has there been any research on establishing a GWP for propane?; (2) since propane is widely used (at least in the USA), fugitive emissions would seem to be a logical concern and, in turn, what happens to these emissions in the atmosphere?<span class="Apple-converted-space"> </span>Any leads or insights would be appreciated.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Regards,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Dennis</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Greenhouse Gas Inventory Experts Network</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.ghgnetwork.org</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">To post message:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Discuss mailing list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:Discuss@ghgnetwork.org">Discuss@ghgnetwork.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">To unsubscribe:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://milkyway.forumone.com/mailman/listinfo/discuss">http://milkyway.forumone.com/mailman/listinfo/discuss</a></div> </blockquote></div><br></div></div></div></div></div></body></html>