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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008>Dear Dennis,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008>I think you will find your anwswer in a IPCC-TEAP
report on HCFCs (2004?) where I remember a list with GWPs of all refrigerants
was included. The CDM Executive Board has in additon mandated the Meth Panel to
investigate on upstream impacts Climate of Propane use related to
NM0247.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008>Best regards</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=921092005-17072008>Othmar</SPAN></FONT></DIV>
<DIV> </DIV>
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size=2>________________________________</FONT></DIV>
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<DIV align=left><FONT face=Arial size=2>Othmar Schwank<BR>Managing
Director/Member of the Executive Board </FONT></DIV>
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<DIV align=left><FONT face=Arial size=2>INFRAS <BR>Consulting, Analysis &
Research <BR>Binzstrasse 23, Postfach<BR>CH-8045 Zurich,
Switzerland <BR>________________________________</FONT></DIV>
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<FONT face=Tahoma size=2><B>Von:</B> discuss-bounces@ghgnetwork.org
[mailto:discuss-bounces@ghgnetwork.org] <B>Im Auftrag von </B>Michael
Gillenwater [moderator]<BR><B>Gesendet:</B> Donnerstag, 17. Juli 2008
04:16<BR><B>An:</B> Mark A. Delucchi; Dennis O'Regan<BR><B>Cc:</B>
discuss@ghgnetwork.org<BR><B>Betreff:</B> Re: [GHG Network] Propane and
GWPs<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV
style="FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-serif">Dennis,<BR><BR>I
would have to dust off my old atmospheric chemistry textbooks, but I would guess
that the atmospheric lifetime of propane is pretty short relative to long-lived
GHGs, such as those covered under the Kyoto Protocol. Typically for GWPs
we focus on the direct radiative forcing effect, which is of the propane
molecule itself. I think it is safe to assume that propane has a short
atmospheric life-time, as I do not hear anyone talking about propane
accumulating in the atmophere. I checked at old reference, and even in dirty LA
air, the mixing ratio of propane is only about 18 ppb. <BR><BR>Even if propane
had a powerful instantaneous radiative forcing effect (with is probably
doesn't), it is not around long enough to do much.<BR><BR>Now, propane could
have some indirect radiative forcing effects, such as its impact on ozone
formation, as a sink for OH (which would cause methane to say around longer),
and by oxidation to CO2, as noted by Mark below. However, the GWPs we use
for GHG accounting under most conventions, almost exclusively rely on direct GWP
values.<BR><BR>michael <BR>
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<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman,new york,times,serif">-----
Original Message ----<BR>From: Mark A. Delucchi
<madelucchi@ucdavis.edu><BR>To: Dennis O'Regan
<doregan@libertyenviro.com><BR>Cc: discuss@ghgnetwork.org<BR>Sent:
Wednesday, July 16, 2008 7:57:44 PM<BR>Subject: Re: [GHG Network] Propane and
GWPs<BR><BR>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
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<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" target=_blank rel=nofollow
ymailto="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="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 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="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 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: 0px">Regards,</DIV>
<DIV style="MARGIN: 0px">Dennis</DIV>
<DIV style="MARGIN: 0px">_______________________________________________</DIV>
<DIV style="MARGIN: 0px">Greenhouse Gas Inventory Experts Network</DIV>
<DIV style="MARGIN: 0px">www.ghgnetwork.org</DIV>
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