WUWT has a post about Amberley. Amberley is part of the high quality Australian network ACORN. You can scroll down that catalogue to see pictures and description of the site. I've been hearing rumblings about Amberley for months - now apparently Jennifer Marohasy has persuaded Graham Lloyd at the Oz to run a story on how Australia's temp record is being corrupted.
It's of course a familiar story, and Lloyd doesn't need much persuading. It is of course a cherry-pick; even more so since what is shown is the plot of minimum temps; max temps would show only half the effect.
WUWT readers are very short of information here. Lots seem to think that the BoM has obliterated the original data, despite the post featuring a plot of original vs adjusted. So I thought I would try to help, with the following comment:
Mark Addinall says: August 23, 2014 at 9:42 am
"If anyone cares to remember I did that analysis some four years ago. Back when the raw data could still be had over the web. Data has gone."
It hasn't gone. It's all there, as originally reported, at ghcn unadjusted. There is even, normally, a complete accounting, with the effect of GHCN adjustments shown Amberley here. I'm pretty sure you can get unadjusted from BoM too.
Pamela Gray says: August 23, 2014 at 9:58 am
"This is germane to the brief discussion I had with Leif. He asks to be pointed to a temperature record data set used for research purposes that is valid and reliable. My response was that there were none to my knowledge."
Again, GHCN unadjusted has the original data. Go to Daily if you want lots of it. I have an index, TempLS, which works directly from this data.
Anyway, about a week ago I was put on a two-day time-out (circumstances described here). It still persists, and my posts still disappear when I submit them. Twelve hours later, still no show - saga described here.
On the actual adjustments, if you follow the GHCN graphic for Amberley that I tried to link WUWT to, it shows the adjusted and unadjusted (min/max average), and the actual adjustments. There's only one major one, in about 1980. But because the record at 70 yrs is relatively short, it has quite a big effect on the trend. BoM say they don't know what happened, but you can see in the unadjusted a dive around that time, and apparently when compared with neighboring stations, it didn't seem to be climate. Amberley is on the fringe of Brisbane, so there is plenty of data nearby.
I referred in my WUWT offering to a possible BoM source of unadjusted data. I have now located it. It isn't very convenient; you are supposed to input search data for each station and display a graph or table. And they do only min and max; no average.
I've been building up a BoM portal, and I thought this would be a useful addition. I've done it in the first instance for the BoM 2012 HQ network. This is basically ACORN plus some long record stations that have terminated. I downloaded the list from David Stockwell, where there are more details.
So table below the jump, presented in the hope that people will compute more representative cases.