More appropriate for geo. G Sent from my iPhone
Begin forwarded message: > From: Renaud de RICHTER <renaud.derich...@gmail.com> > Date: July 20, 2018 at 7:13:53 AM PDT > To: Carbon Dioxide Removal <carbondioxideremo...@googlegroups.com>, > geoengineering <geoengineering@googlegroups.com>, ron.zevenho...@abo.fi, > martin.f...@abo.fi > Cc: Leon Di Marco <len2...@gmail.com>, denis.bonne...@normalesup.org > Subject: [CDR] A 3rd, new and less intrusive geoengineering approach > > Very good paper (pay wall) from Zevenhoven, Ron, and Martin Fält. > "Radiative cooling through the atmospheric window: A third, less intrusive > geoengineering approach." Energy 152 (2018): 27-33. > > Unfortunately the authors forgot to cite previous similar proposals see here, > here and here (open access). > > Abstract > Geoengineering methods based on either direct carbon dioxide removal (CDR) > from the atmosphere or solar radiation management (SRM) that curtails solar > irradiation are campaigned for as technical solutions that would slow down > the global temperature rise and climate change. Except for a few CDR methods, > this does not receive much interest from policy-makers as a result of a lack > of evidence on net advantages and decision-making challenges related to > boundary-crossing effects, not to mention costs. An alternative, third > geoengineering approach would be enhanced cooling by thermal radiation from > the Earth's surface into space. The so-called atmospheric window, the 8–14 μm > bandwidth where the atmosphere is transparent for thermal radiation indeed > offers a “window of opportunity” for technology that enables sending out > thermal radiation at rates that significantly exceed the natural process. > This paper describes work that addresses this, with focus on technical > devices that combine materials with the properties required for enhanced long > wavelength (LW) thermal radiation heat transfer from Earth to space, through > the atmospheric window. One example is a skylight (roof window) developed and > tested at our institute, using ZnS windows and HFC-type gas (performing > better than CO2 or NH3). Suggestions for several other system layouts are > given. > > Highlights > > • Passive radiative cooling should be seen as geoengineering method, cooling > Earth. > • The atmospheric window (8–14 μm) allows for heat transfer through the > atmosphere. > • Choices of suitable materials with long wavelength transparency are limited. > • Experimental findings verified theoretical assessment and model simulation > work. > • Passive radiative cooling during daytime still presents a considerable > challenge. > > -- > You received this message because you are subscribed to the Google Groups > "Carbon Dioxide Removal" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to carbondioxideremoval+unsubscr...@googlegroups.com. > To post to this group, send email to carbondioxideremo...@googlegroups.com. > Visit this group at https://groups.google.com/group/CarbonDioxideRemoval. > To view this discussion on the web visit > https://groups.google.com/d/msgid/CarbonDioxideRemoval/CAHodn9_pmz4kwJpTanorq-Ycca-fDrC-zdKxM9Bbr818yGjaxg%40mail.gmail.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To post to this group, send email to geoengineering@googlegroups.com. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
