Archives par mot-clé : Satellite Data

UAH: 2017 was third warmest year in satellite record

by Antony Watts, January 3, 2017 in WUWT


From the University of Alabama, Huntsville.

Global Temperature Report: December 2017
Global climate trend since Nov. 16, 1978: +0.13 C per decade
December temperatures (preliminary)

Global composite temp.: +0.41 C (about 0.74 degrees Fahrenheit) above 30-year average for December.
Northern Hemisphere: +0.50 C (about 0.90 degrees Fahrenheit) above 30-year average for December.
Southern Hemisphere: +0.33 C (about 0.59 degrees Fahrenheit) above 30-year average for December.
Tropics: +0.26 C (about 0.47 degrees Fahrenheit) above 30-year average for November.

Global Temperature Report: November 2017

by UAH and Dr. J. Christy in A. Watts, December 4, 2014 in WUWT


The average global temperature drop between October and November, 2017, tied for the fifth largest one-month-to-the-next drop in the 39-year satellite temperature record, according to Dr. John Christy, director of the Earth System Science Center (ESSC) at The University of Alabama in Huntsville. Compared to seasonal norms, the average temperature around the globe fell 0.27 C (almost 0.49 degrees F) between October and November. (The largest drop was from January to February 2013, when the global average temperature fell 0.32 C.)

German Scientists Call Recent Sea Level Rise Claims “Fijigate”, …Hyped Up To Generate Money

by Dr. Sebastian Lüning and Prof. Fritz Vahrenholt, November 15, 2017 in  NoTricksZone


After a peak in 2012 the level went down by about 10 cm by mid 2017. It is very much related to natural variations, in sync with the El Ninos (low levels) and La Ninas (high levels).

So what remains of the climate change horror stories in connection to the Fiji Islands? (…)

What do we know about Arctic sea ice trends?

by Dr. Ronan Connolly & Dr. Michael Connolly, August 16, 2017 in WUWT

Satellite observations indicate that the average Arctic sea ice extent has generally decreased since the start of the satellite records in October 1978. Is this period long enough to assess whether the current sea level trend is unusual, and to what extent the decline is caused by humans?

This change in Arctic climate is often promoted as evidence that humans are causing drastic climate change. For instance, an April 29th 2017 article in the Economist (“Skating on thin ice”, pg 16) implied that the Arctic is melting unusually, dramatically and worryingly (…)


 

Des corrections aux données satellitaires augmentent de 140% le réchauffement : le commentaire de Roy Spencer

by Uzbek, 7 juillet 2017 in ClimatoRéalistes


Le site carbonbrief  a publié le 30 juin 2017 un article sous le titre : « Des corrections majeures aux données satellitaires augmentent de 140% le réchauffement depuis 1998[1] »

Précisons d’abord que Les satellites ne mesurent pas directement la température. Ils sont équipés de capteurs sensibles à la luminance de l’atmosphère et de la mer dans le spectre des infrarouges.  Pour en dériver  la température, des traitements informatiques sur les données brutes sont nécessaires.

Satellite battle: Five reasons UAH is different (better) to the RSS global temperature estimates

by JoNova, July 10, 2017


There are two main groups that use essentially the same NASA and NOAA satellites to estimate global temperatures. In the last year, they’ve both made adjustments, one down, and one up, getting further apart in their estimates. In ClimateWorld this is a big deal. Believers are excited that now a satellite set agrees a bit better with the maligned “hot” surface thermometers. But UAH still agrees more with millions of weather balloons. The debate continues. Here’s my short synopsis of the  Roy Spencer (and John Christy) from the “Comments on the new RSS lower tropospheric temperature set.” (If something is wrong here, blame me).

RSS Adjust Their Temperatures–Guess Which Way?

by  Paul Homewood, June 30, 2017


For years, RSS have been an embarrassment to the climate establishment. Their satellite data has consistently shown the pause in global temperatures since 1998, which so many scientists have attempted to explain.

At the same time, the surface datasets of GISS, NOAA and HADCRUT have diverged, with the help of adjustments, to show much greater warming.

The pressure on RSS to conform has been immense, and now the inevitable has happened. Highly conveniently they have found huge errors in their previous version, and have now adjusted to a new version, v4, which miraculously finds that global warming has continued unabated after all!