The Blackboard

Update: Mystery Solved! See below. One thing that has always been somewhat of a mystery for us in the land temp reconstruction community is why the GISTemp land record is so much lower than our reconstructions. We know that our reconstructions are pretty much in line with or somewhat below NCDC land temps (likely somewhat [...]

GISS reported a temperature anomaly of 0.73C for April, making this the warmest April and the fifth warmest month in their record. The temperature dropped relative to the current value of 0.84C for May. The trend since 1980 is 0.166 C/decade, which remains below the nominal trend of 0.2C/decade predicted for the first part of [...]

NOAA’s temperature anomalies have been released. The March temperature anomaly is reported at 0.7735C, and compared to historic values below. As many of you know, Steve McIntyre reported suspicious readings are reported for Finland. Zeke discovered that GISS has now reported a correction for their metric. “2010-04-15: The data shown between 4/13 and 4/15 were [...]

The “toy planet” discussion of the “basic” anomaly method in its most idealized form was such a hit, I’ve decided to discuss how the ‘bias’ method used in section (3) of Hansen and Lebedeff 1987 — the method actually used by GISTemp– might be affected by deal with “the march of the thermometers”. One reason [...]

GISS has posted their December anomaly.The NH+SH anomaly for December is 0.59C down from 0.68 C for for November.The trends since 2000 and 2001 are illustrated below; a nominal trend of 0.2 C/decade is illustrated for reference: It looks like this is the 4th warmest December in the GISSTemp record. I’m afraid I just noticed [...]

The GISSTemp for November 2009 has been posted. The November 2009 anomaly exceeds the current October 2009 anomaly of 0.64C, and also exceeds the October 2009 anomaly of 0.67C published last month. Because a blog visitor wanted to know whether the nomimal IPCC Trend of 0.2C/decade still fell outside the ±95% uncertainty intervals, I’ve plotted [...]

GISS published the land/ocean anomaly for October 2009: 0.66C. This equals their anomaly for September. That is, it matches the value for September as published in November. The September anomaly in the Google cache is 0.65C. (I was wondering if this would change much given Hadley’s reticence in processing September data. A change of 0.01C [...]

As many of you are aware, I am addicted to watching the monthly temperatures update. I was a bit surprised when “Change Detection” alerted me to a change of the GISS SST page. It seemed a bit early for November’s temperatures to appear. Still I visited the land/ocean temperature page. Sure enough, it is too [...]

GISS posted September’s temperature anomaly: 0.65 C. It was toasty! In fact, this September GISS temp exceeded the September 1998 value– but it does not exceed September 2005, which clocked in at 0.67C. Here are all the anomalies for months this years, in 100th of C: 2009 53 43 46 46 55 65 62 52 [...]

All the surface temperature anomalies are in for August 2009. Trends since 1990 and 2001 are shown below and compared to the multi-model mean trend from the AR4: As many are aware, both Hadley and NOAA reported August anomalies exceeded July anomalies. Specifically: Hadley reported 0.532C up from 0.499 in July. NOAA reported 0.6164C up [...]