Just How Much is the Earth Warming?
October 29, 2011 Leave a comment
Most agree that the Earth may have experienced a warming trend over the last 100 years – but how much?
Here is a look at the mean temperature trend using the instrument record.
Fig1. First estimate of global land temperature trends. As always in the RUTI project, data are unadjusted GHCN and the main efforts in the RUTI project is to identify areas of similar temperature trend before averaging – this due to limited data periods made available from GHCN (see more). As will be the case for all data sources, older data, especially before 1900 has limited data as foundation. All RUTI data in the present article use 1961-90 as base period.
1) Temperature peak in the latest decade appears to be around 0,22 K warmer than the 1940´ies heat peak.
2) We see a strong temperature decline 1940-78 around 0,55-0,6 K.
Read more at ‘Hide the Decline’
Hers a look at mean temperatures from the Satellite data…
Latest Global Average Tropospheric Temperatures
Since 1979, NOAA satellites have been carrying instruments which measure the natural microwave thermal emissions from oxygen in the atmosphere. The signals that these microwave radiometers measure at different microwave frequencies are directly proportional to the temperature of different, deep layers of the atmosphere. Every month, John Christy and I update global temperature datasets (see here and here)that represent the piecing together of the temperature data from a total of eleven instruments flying on eleven different satellites over the years. As of early 2011, our most stable instrument for this monitoring is the Advanced Microwave Sounding Unit (AMSU-A) flying on NASA’s Aqua satellite and providing data since late 2002.
Read more at Roy Spencer’s site: http://www.drroyspencer.com/latest-global-temperatures/