Reader Benjamin Franz complained that the GISS graph I used included ocean temperatures, whereas the NCAR graph was land only. Fair enough. Below is the same comparison using GISS land-only temperatures.
Here is the original graph which he objected to.
I said NORTHERN HEMISPHERE Land Only.
You just compared it with GLOBAL Land Only. You can get the NH land only data from the NCDC FTP site. You want the monthly.land.00N.90N.df_1901-2000mean.dat and plot it with a 10 year average.
It will not matter what reports he uses to produce the graphs. If the graphs were produced using data from different records they will be different. The graph used in Hansen’s work in 1988 would not be compatible to work produced today because they have discovered BETTER methods of producing results.
GISS is 90% or more fabrication. It is possible it is almost 99.9% fabrication due to PROPER adjustments.
Of course you can always claim they are CONSISTENT with each other just like Turnips are consistent with Tulips or Pears are consistent with Peas.
Thanks. Are those NCDC numbers in F or C?
They are in C. Climate data is always in units of C in reference data.
Ten years for averaging was an arbitrary choice. If you vary over 5 to 15 years for averaging you can see that the size of the narrower peaks depends on how much averaging you do.
The essential point however that the decline from 1950 to 1970 is clearly apparent regardless.
Thanks. The 1970 NCAR graph was in F
Because it was in a popular news magazine written for Americans 35 years ago. Scientists haven’t used F for their work in a very long time: Arhennius used C for his work over a hundred years ago.
F is a pretty much useless unit for scientists.
Not really useless.
0F is an important number if you live in a cold climate. You can’t melt ice with salt below that temperature.
Salt can melt ice down to -21°C (-6°F) in the lab. Down to about -9°C (15°F) under normal sidewalk conditions. Neither of which has any relevance t0 0°F.
Nice try.
“According to a letter Fahrenheit wrote to his friend Herman Boerhaave,[7] his scale was built on the work of Ole R?mer, whom he had met earlier. In R?mer?s scale, the two fixed reference points are that brine also freezes at 0 degrees ….”
http://en.wikipedia.org/wiki/Fahrenheit_scale
Any competent scientist, engineer, or high school graduate can do unit conversions, so I’d say C is nearly as useless as F, because for many things absolute temperature is needed. Thus, Rankine or Kelvin is superior to either.
If you’re doing anomalies, then it doesn’t matter at all. F = 9/5*C, piece of cake. Somehow I think you know this already and are just being argumentative.
-Scott
While Centigrade works well in a laboratory, the Fahrenheit scale is quite good for weather, with 0 to 100 being the normal range of most of Earth’s temperatures. Plus it is higher resolution, obviating the need for fractional degrees on thermostats and such.
No unit is useless.
You omitted the following from the Wikipedia article:
(emphasis added by me)
Ammonium chloride is not what people use to salt walks and roads – that is sodium chloride.
While they are both ‘salts’ in the chemical sense, the one linked with 0°F has nothing to do with salting sidewalks or roads and so does not matter even “if you live in a cold climate”.
NCDC and USHCN normally report temperatures in F