tag:blogger.com,1999:blog-7729093380675162051.post1048663037218870755..comments2024-03-28T13:56:47.604+11:00Comments on moyhu: TempLS and the new ERSST V4Nick Stokeshttp://www.blogger.com/profile/06377413236983002873noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-7729093380675162051.post-52576357995205998382015-07-20T00:52:27.027+10:002015-07-20T00:52:27.027+10:00FWIW, there is a new merged radiosonde dataset goi...FWIW, there is a new merged radiosonde dataset going back to 1905.<br />http://www.earth-syst-sci-data.net/6/185/2014/essd-6-185-2014.pdf<br />http://www.earth-syst-sci-data.net/6/297/2014/essd-6-297-2014.pdf<br />http://onlinelibrary.wiley.com/doi/10.1002/2014JD022664/full<br />ccehttps://www.blogger.com/profile/03646816472336349526noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-73543778618572742422015-06-22T23:57:37.647+10:002015-06-22T23:57:37.647+10:00Interesting topic certainly. There is a group part...Interesting topic certainly. There is a group particularly looking at the question you're discussing in particular.Robert Waynoreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-20802500119717976592015-06-22T20:26:47.180+10:002015-06-22T20:26:47.180+10:00Olof,
I'm now using v4. That may have made pa...Olof,<br />I'm now using v4. That may have made part of the difference. In fact, I now have the new reporting system, with new maps etc, all using TempLS V3 and ERSST V4.Nick Stokeshttps://www.blogger.com/profile/06377413236983002873noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-76012902267546215652015-06-22T20:10:24.006+10:002015-06-22T20:10:24.006+10:00Btw, the recent century trend (2000- now) of TempL...Btw, the recent century trend (2000- now) of TempLSmesh has increased slightly with the correction. It is now 1.44 C/ century, beating C&W, new NOAA, Karl et al kriging. Wonder what the inclusion of ERSST v4 will do with this trend, 1.6 C... ?Olofnoreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-90377376593481432572015-06-22T19:43:38.557+10:002015-06-22T19:43:38.557+10:00The TempLS60 is quite impressing, it follows Giste...The TempLS60 is quite impressing, it follows Gistemp dTs very well, and is not much noisier. Yet, there is seemingly room for improved ocean coverage, Hawaii and the Azores for instance.<br />This kind of experiment with reduced number of station gives confidence to e.g. RATPAC with 85 sites with a good global distribution.<br /> My interest in pure 2 m air temp datasets is for CMIP5 comparisons, that by standard are 2 m temps. The CMIPs themselves tell that SST and 2m air over ocean don't follow each other in a warming world. The SST trend for 2000-2030 is about 25% lower than the air over ocean trend...Olofnoreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-60164131355277129522015-06-21T22:20:47.173+10:002015-06-21T22:20:47.173+10:00Olof,
"Nick, have You ever produced a fully g...Olof,<br /><i>"Nick, have You ever produced a fully global land station only TempLS mesh"</i><br /><br />All it needs is to leave out the SST stations. I have experimented over the years with reduced stations numbers, as <a href="http://moyhu.blogspot.com.au/2011/03/area-weighting-and-60-stations-global.html" rel="nofollow">here</a> and <a href="http://www.moyhu.blogspot.com.au/2014/01/just-60-global-stations-area-weighting.html" rel="nofollow">here</a>. There actually isn't, IMO, much justification for retaining the full land set with the oceans so poorly represented.<br /><br />Nick Stokeshttps://www.blogger.com/profile/06377413236983002873noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-36868320760750738022015-06-21T19:52:06.496+10:002015-06-21T19:52:06.496+10:00It looks much better now. Feb 1998 is the warmest ...It looks much better now. Feb 1998 is the warmest month of the 20th century and Jan 2007 is the warmest ever, like the other global data sets.<br /><br />CCE, KNMI climate explorer has ICOADS v2.5 MAT with global average, updating every month, in contrast to the UK MAT series that were discontinued 2010. However the ICOADS MAT are raw, no adjustments for ship heights etc, but that has probably not changed much the last decades. Global MAT for May is up 0.06 C from April for instance, which agrees with the major SST datasets.<br /><br />Nick, have You ever produced a fully global land station only TempLS mesh, a kind of Gistemp dTs analogue? The Gistemp is limited by the max 1200 km infill, C&W produce a CRUTEM4 kriging but unfortunately put a land mask on it. BEST Land with their large station data base and ability to use short segments of data would be ideal for this purpose, but they also use a land mask.Olofnoreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-53676078553775906962015-06-21T08:47:11.785+10:002015-06-21T08:47:11.785+10:00CCE,
Yes, I was surprised that it had escaped noti...CCE,<br />Yes, I was surprised that it had escaped notice. It shows up more here with the annual smoothing. The file with the error is from August 2011. It mostly affects pre-2010 data, which are not closely watched. SST is less volatile, so often the change over a year isn't great.<br /><br />The new version will show just what is involved in using more exotic data. I don't think the scalpel is a magic bullet; splitting series comes at a cost. I think both radiosonde and MAT would have coverage problems.Nick Stokeshttps://www.blogger.com/profile/06377413236983002873noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-56266585599655317602015-06-21T08:32:06.826+10:002015-06-21T08:32:06.826+10:00I haven't been paying close attention recently...I haven't been paying close attention recently but I don't remember such a large misalignment when comparing TempLS to other the analyses. How long has the error been around?<br /><br />In any case, cool stuff.<br /><br />Have you ever considered adapting it to accept other data sources like radiosondes or marine air temperature? It's always seemed to me that the least squared method combined with a Berkeley earth style "scalpel" method would work well for those types of data. For Radiosondes you could compare against satellite data (either processed or "raw") to detect discontinuities. For MAT you could compare against the standard TempLS output.<br /><br />Obviously, a lot of work, but you seem to have infinite energy!ccehttps://www.blogger.com/profile/03646816472336349526noreply@blogger.com