Physics @ Berkeley
Events in Physics
Title: A Reexamination Of Global Warming    (Colloquia)
Start Date: 11/07/2011
Time: 4:15 pm
Location: 1 LeConte Hall
Speaker: Richard Muller
Affiliation: Professor of Astrophysics, UC Berkeley
Contact Person: Sarah Wittmer   (510) 642-3034

The most quantitative evidence for global warming consists of 1.4 billion earth land surface temperature measurements dating back to ThomasJefferson and Benjamin Franklin. There is useable Earth coverage from 1800 to the present, and excellent coverage from 1900 onward. There havebeen several criticisms of the prior analyses of these data by NOAA, NASA, and the UK. These include data selection bias (the groups use on 20% or less of the available stations), poor station quality (80% of the US stations are ranked poor by US govt standards), unseparated influence of urban heat islands, and possible bias from the adjustment procedures applied to the data to compensate for station moves and instrument changes. We have now completed a new study of all these issues. Using a statistical approach developed by team member Robert Rohde, we are able to use virtually all the data. We’ve studied each of the systematics in depth, and have looked at possible driving forces other than the greenhouse effect. Our ongoing work consists of analysis of ocean dataand exploratory analysis of other climate effects.