Category Archives: Model-Data LOST

Early 20th Century Warming – Polar Amplification, Model-Data & Model-Model Comparisons

Posted on February 6, 2019 by Bob Tisdale

In this post, we’re going to illustrate how poorly climate models used by the IPCC for their 5th Assessment Report simulate the polar amplification that data indicates took place during the early 20th Century warming period of 1916 to 1945.

Posted in Model-Data LOST, Polar Amplification | 8 Comments

Global Mean Surface Temperature: Early 20th Century Warming Period – Models versus Models & Models versus Data

Posted on January 31, 2019 by Bob Tisdale

This is a long post: 3500+ words and 22 illustrations. Regardless, heretics of the church of human-induced global warming who frequent this blog should enjoy it.  Additionally, I’ve uncovered something about the climate models stored in the CMIP5 archive that … Continue reading →

Posted in Model-Data Comparison - General, Model-Data Comparison LSAT, Model-Data Comparison SST, Model-Data LOST | 18 Comments

EXAMPLES OF HOW AND WHY THE USE OF A “CLIMATE MODEL MEAN” AND THE USE OF ANOMALIES CAN BE MISLEADING

Posted on November 29, 2018 by Bob Tisdale

THE POST HAS BEEN UPDATED. SEE THE UPDATE AT THE END OF THE POST: Alternate Title: An Average of Climate Models, Which Individually Give Wrong Answers, Cannot, By Averaging Them, Give the Right Answer, So A Model Mean Can Be … Continue reading →

Posted in Global Warming in Perspective, Model-Data LOST | 6 Comments

What Was Earth’s Preindustrial Global Mean Surface Temperature, In Absolute Terms Not Anomalies, Supposed to Be?

Posted on November 27, 2018 by Bob Tisdale

And What Have the Average Temperatures of Earth’s Surfaces Been Recently in Absolute Terms, Not Anomalies? The answers may surprise you. THIS POST HAS BEEN UPDATED. The update is near the end of the post.

Posted in Global Warming in Perspective, Model-Data LOST | 12 Comments

Quiz: Which 30-Year Warming Period Is Recent?

Posted on July 12, 2016 by Bob Tisdale

THREE MAPS ILLUSTRATING SIMILAR GLOBAL SURFACE TEMPERATURE CHANGES OVER DIFFERENT 30-YEAR PERIODS The GISS map-making webpage allows users to create global maps of surface temperature anomalies for specific time periods or to create maps of the change in surface temperatures … Continue reading →

Posted in Climate Model Failings, GISS, Model-Data LOST | 4 Comments

The Illusions Provided by Time-Series Graphs of Climate Model Ensembles and Model Spreads

Posted on April 6, 2016 by Bob Tisdale

The post Controversy over comparing models with observations at Judith Curry’s Climate Etc. prompted this post.  Judith’s post includes a Twitter exchange and a couple of model-data comparison graphs furnished by Dr. Gavin Schmidt, the director of the Goddard Institute of … Continue reading →

Posted in Climate Model Failings, Model-Data LOST | 6 Comments

April 2015 Global Surface (Land+Ocean) and Lower Troposphere Temperature Anomaly & Model-Data Difference Update

Posted on May 14, 2015 by Bob Tisdale

This post provides an update of the data for the three primary suppliers of global land+ocean surface temperature data—GISS through April 2015 and HADCRUT4 and NCDC through March 2015—and of the two suppliers of satellite-based lower troposphere temperature data (RSS … Continue reading →

Posted in GISS, HADCRUT4, Model-Data LOST, TLT and LOST Updates, TLT Update | 10 Comments

Does the Uptick in Global Surface Temperatures in 2014 Help the Growing Difference between Climate Models and Reality?

Posted on January 16, 2015 by Bob Tisdale

This post includes calendar year 2014 global surface temperature data from GISS and NCDC. I thought it would be interesting to begin the introduction as if GISS and NCDC were announcing year-end business profits at their press conference today. [sarc … Continue reading →

Posted in Global Temperature Update, Model-Data LOST | 73 Comments

A Few Quick Comments on the New Paper by Gavin Schmidt and Steven Sherwood

Posted on December 29, 2014 by Bob Tisdale

In his post Schmidt and Sherwood on climate models, Andrew Montford of BishopHill commented on the new paper by Schmidt and Sherwood A practical philosophy of complex climate modelling (preprint).  I haven’t yet studied the Schmidt and Sherwood paper in … Continue reading →

Posted in Model-Data Comparison SST, Model-Data LOST | 8 Comments

Interesting Post at RealClimate about Modeled Absolute Global Surface Temperatures

Posted on December 24, 2014 by Bob Tisdale

We recently presented and discussed modeled and observed global surface temperatures in absolute terms. See the post On the Elusive Absolute Global Mean Surface Temperature – A Model-Data Comparison. The WattsUpWithThat cross post is here. Yesterday, Willis Eschenbach at WUWT furnished … Continue reading →

Posted in Model-Data LOST | 16 Comments