tag:blogger.com,1999:blog-8652113881570697592.post3326758040952712781..comments2023-02-22T20:33:24.045+02:00Comments on Notes, Observations, Comments...: Vesihöyrystä ja kasvihuoneilmiöstä0^0http://www.blogger.com/profile/09590270703159793784noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-8652113881570697592.post-91683658039050927462013-10-08T21:06:37.567+03:002013-10-08T21:06:37.567+03:00Eräs kommentoija muistutti (kiitos siitä!) että pi...Eräs kommentoija muistutti (kiitos siitä!) että pilvien roolia ilmaston säätelyssä käsitellään myös viimeisessä IPCC raportissa mistä seuraavat otokset<br /><br /><i>7.2.5.7 Observational Constraints on Global Cloud Feedback<br /> <br />A number of studies since AR4 have attempted to constrain overall cloud feedback (or climate sensitivity) from observations of natural climate variability; here we discuss those using modern cloud, radiation or other measurements (see a complementary discussion in Section 12.5 based on past temperature data and forcing proxies).<br />[...]<br />Several studies have attempted to derive global climate sensitivity from interannual relationships between global-mean observations of top-of-atmosphere radiation and surface temperature (see also Chapter 10, Section 10.8.2.2). One problem with this is the different spatial character of interannual and long-term warming; another is that the methodology can be confounded by cloud variations not caused by those of surface temperature (Spencer and Braswell, 2008). A range of climate sensitivities has been inferred based on such analyses (Forster and Gregory, 2006; Lindzen and Choi, 2011). Crucially, however, among different GCMs there is no correlation between the interannual and long-term cloud-temperature relationships (Dessler, 2010; Colman and Hanson, 2012), contradicting the basic assumption of these methods. Many but not all atmosphere-ocean GCMs predict relationships that are consistent with observations (Dessler, 2010, 2013). More recently there is interest in relating the time-lagged correlations of cloud and temperature to feedback processes (Spencer and Braswell, 2010) but again these relationships appear to reveal only a model’s ability to simulate ENSO or other modes of interannual variability properly, which are not obviously informative about the cloud feedback on long-term global warming (Dessler, 2011).</i><br /><br />Eli Spencerin ja LIndzenin tutkimukset on toki huomioitu mutta koska niiden tuloksia ei ole pystytty muiden tutkijioden toimesta toistamaan niin ne eivät myöskään ole päässeet sen pidemmälle. Näin tiede toimii.<br /><br />Hyvä kooste linkkejä joukkoon IPCC WG1:n referoimia tutkimuksia löytyy <a href="http://agwobserver.wordpress.com/2013/10/08/ipcc-ar5-references-wg1-introduction/" rel="nofollow">AGW Observer sivustosta</a>0^0https://www.blogger.com/profile/09590270703159793784noreply@blogger.com