tag:blogger.com,1999:blog-7729093380675162051.post2753562119541889297..comments2024-03-28T13:56:47.604+11:00Comments on moyhu: Google Maps and GHCN adjustmentsNick Stokeshttp://www.blogger.com/profile/06377413236983002873noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7729093380675162051.post-82404324847024697082015-02-19T09:33:33.326+11:002015-02-19T09:33:33.326+11:00Neither ADAK nor Dutch Harbor are current stations...Neither ADAK nor Dutch Harbor are current stations. Basically GHCN is a mix between a historic project in early 90's, where they basically collected every good record available, and an ongoing project since about 1997, with selected stations. We can think over where stations might be best placed, but for the history, we just have to use what is there.<br />Nick Stokeshttps://www.blogger.com/profile/06377413236983002873noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-72362021130484242962015-02-19T09:26:54.631+11:002015-02-19T09:26:54.631+11:00I agree that the urban classifications can be surp...I agree that the urban classifications can be surprising. But Here are the inventory listings. The C at the end means Urban<br />42570454000 51.8800 -176.6500 4.0 ADAK/NAVY 0R -9MVxxCO 1A-9HEATHS, MOORS C<br />42570482001 53.9000 -166.5300 5.0 DUTCH HARBOUR ALASKA 0R -9MVxxCO 1A-9HEATHS, MOORS CNick Stokeshttps://www.blogger.com/profile/06377413236983002873noreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-71417355589228022122015-02-19T08:49:22.066+11:002015-02-19T08:49:22.066+11:00Something's odd with the Urban thing. Both 425...Something's odd with the Urban thing. Both 42570454000 and 42570482001 show as urban on the map. But they're both listed and rural and low night light (R and C) in the inv file.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7729093380675162051.post-31251242491214454382015-02-19T04:51:12.320+11:002015-02-19T04:51:12.320+11:00Impressive. Needless to say I checked a few plac...Impressive. Needless to say I checked a few places I've lived to see how my personal experience correlates to the adjustments. <br /><br />While looking at this map, I realize that two of the stations are poorly sited for global studies being as they are at boundary conditions extremely susceptible, or amplifying, slight changes. <br /><br />A vertical boundary condition exists at my hometown which sits in a bowl. Cold, dense air accumulates in the winter with a sharp boundary layer to much warmer air sitting on top of the bowl. The station is right at the edge of this bowl so in winter it might be measuring the cold, dense air or the warmer air just above it and the difference is enormous, 20 to 40 degrees (F) in less than a thousand feet.<br /><br />A lateral boundary exists in the Aleutian Islands. ADAK/NAVY 42570454000. Trend Adj 1.06. Urban. Airpt Y<br /><br />Urban? You've got to be kidding me. Take a look on Google Earth. Yeah its an airport but the *minimum* wind was hardly ever less than 20 knots typically 40 knots, well mixed in other words. Furthermore it has only 10 sunny days a year so UHI is nonexistent. Really, seriously, when the sun came out, which it did only in the eye of each cyclonic storm in an eternal succession of such things, you had one hour to enjoy it. <br /><br />But those storms breed because of a collision of cold, dry polar easterlies with mid-latitude westerlies which blow over the Japan Current to pick up heat and moisture. <br /><br />A slight movement poleward of this boundary will produce huge and dramatic changes on the land underneath the former location of the boundary. It doesn't mean huge and dramatic global climate change; it means that change is more noticeable at a boundary. Anyway, the adjustments are rather severe on this station which I consider improper because the actual change on the ground was dramatically noticeable. I was there in the 1970's during Northern Hemisphere's cold spell and it was impressively stormy; blew the roof right off the building where I was staying (it had a doubled roof fortunately) and the anemometer, or wind speed thingy, blew right off the mast but it recorded something like 180 knots before it was ripped off the mast. What happens is called "williwaw" and is a combination of wind being funneled between mountains picking up velocity, combined with becoming cooler and denser because of the snow on the mountains, so when it comes pouring down the other side it has gained density and velocity and will follow Earth contours like an avalanche. I had a big heavy chain holding the hood of my pickup truck and pretty much everyone had 2 inch nylon straps fastened to car doors to limit their opening in the case you were an idiot and opened your car door with the wind coming from behind. <br /><br />Fun times. <br /><br />Michael 2noreply@blogger.com