These adjustments, however they are made, tend to slightly increase the warming trends
of global land temperatures compared to the raw data.
They say their results line up with previously published studies and suggest that the
average global land temperature has risen by roughly 0.9 °C since the 1950s.
It began with the creation of several
global land temperature reconstructions by a diverse group of bloggers (generally independent of each other) including Zeke Hausfather of The Blackboard, Nick Barnes of Clear Climate Code (a project to replicate GISS results using clearer processing code), Tamino of Open Mind, Joseph of Residual Analysis, Roman M of Statistics and Other Things, Nick Stokes of Moyhu, and Chad of Trees for the Forest.
A group called the International Surface Temperature Initiative is dedicated to making
global land temperature data available in a transparent manner.
Our work indicates that analysis of
global land temperature trends is robust to a range of station selections and to the use of adjusted or unadjusted data.
Here is the illustration produced by Hawkins and Jones to show how Callendar's findings, published in 1938 and updated in 1961, match a modern - day temperature reconstruction (CRUTEM4) of
global land temperatures for the period 1850 - 2010.
A group called the International Surface Temperature Initiative is dedicated to
making global land temperature data available in a transparent manner.
Land Only: The
August global land temperature was the second highest for August on record, behind only 1998, at 1.78 °F (0.99 °C) above the 20th century average of 56.9 °F (13.8 °C), with a margin of error of + / - 0.43 °F (0.24 °C).
If I'm reading this correctly, the last time there was a
negative global land temperature trend was the late 1960's, with only two or three nearly flat trends very briefly since then?
In determining that, the project examined more than a billion temperature records going back to the 1800s, from 15 different sources around the world, and found that since the 1950s
average global land temperature has risen by roughly 1 °C.
For the globe, ranks of individual years changed in some instances by a few positions, but
global land temperature trends changed no more than 0.01 °C / century for any month since 1880.
Land Only:
The global land temperature was the fifth highest on record for June - August, at 1.64 °F (0.91 °C) above the 20th century average of 56.9 °F (13.8 °C).
It finds that if emissions continue to grow at current rates, with no significant action taken by society, then by 2100
global land temperatures will have increased by 7.9 C, compared with 1750.
The global land temperature was the sixth highest for January — June since records began in 1880, with the Southern Hemisphere land areas fourth warmest for the period and the Northern Hemisphere land areas eighth warmest.
The global land temperature for 2015 was 1.33 °C (2.39 °F) above the 20th century average, surpassing the previous records of 2007 and 2010 by 0.25 °C (0.45 °F).
This was the 24th consecutive July with
global land temperatures above the 20th century average, with July 1992 being the last time July global land temperatures were below average.
The year 2010 tied with 2005 in all three global - scale components:
the global land temperature, the global ocean temperature, and the global land and ocean surface temperature.
Regarding Judith Curry, there is broad general agreement that the results released today give a new and improved estimate of
the global land temperature going back 250 years.
Icy Silence from Climate Alarmists «
Global land temperatures have plummeted by one degree Celsius since the middle of this year — the biggest and steepest fall on record.»
So we here in Oz can proudly claim that our temperature data adjustments are worth close to four times your northern hemisphere temperature data adjustments in
the global land temperature stakes.
A good determination of the rise in
global land temperatures can't be done with just a few stations: it takes hundreds — or better, thousands — of stations to detect and measure the average warming.
The global land temperature alone tied with 2001 and 2011 as the second - warmest August on record.
The main result of this study, that the influence of urban areas on
the global land temperature data set is very small, corroborates the consensus view among climate scientists, including, for example, the recent paper by Souleymane Fall and others.
It's worth emphasizing that the study looked at the effects of urbanization on
the global land temperature trend.
In their second approach, the BEST team performed
a global land temperature reconstruction with their own methodology, using all the data and the very - rural sites only.
Generally,
global land temperatures have been rising more slowly than expected since the 1990s, despite greenhouse gas loading of the atmosphere.
It's also worth noting that Muller himself has been careful not to pronounce on AGW, only the validity of
the global land temperature record.