Recent Differences Between GISS and NCDC SST Anomaly Data And A Look At The Multiple NCDC SST Datasets

18 05 2009

OR…. There are Increases in Trend with Each Update While The Causes of Downward Biases Are Deleted

Guest Essay by Bob Tisdale:

In the recent WUWT post Something hinky this way comes: NCDC data starts diverging from GISS, the differences between GISS and NCDC global temperature anomaly data was discussed. I commented that the GISS and NCDC global surface temperature anomaly data relied on two different SST datasets.

NCDC has their own SST anomaly dataset for their global surface temperature product, and they calculate anomalies against the base years of 1901 to 2000. GISS has used the NCDC OI.v2 SST anomaly data since December 1981, and before that they had used the Hadley Centre’s HADSST data. GISS then splices the two datasets together. This post does not discuss the HADSST data, but delves into the differences between the multiple NCDC SST anomaly datasets, one of which is used by GISS. Read the rest of this entry »


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Categories : Uncategorized

Why the SWPC F10.7 radio flux graph is wrong

18 05 2009

Leif Svalgaard writes: “Several people asked why I said that the SWPC F10.7 graph was ‘just wrong’. And I promised a follow up on that. Here it is.”

Happy to oblige! For reference, here is the original graph from SWPC. – Anthony

SWPC_radioflux_Apr09

click for source image

The SWPC F10.7 Radio Flux Prediction Graph

Leif Svalgaard, May 2009

Fitting the monthly average the F10.7 flux (reduced to 1 AU) against the International Sunspot number, R, for the entire interval 1951-2009 to a forth order polynomial gives a formula for computing the Flux from the sunspot:

Flux = 67.29 + 0.316 R + 0.01084 R 2 – 0.006813 R 3 + 0.0000001314 R 4 (1)

The correlation is shown in Figure 1 below: Read the rest of this entry »


Comments : 82 Comments »

Categories : Science, solar

Glasgow Looking To Freeze In The Dark

18 05 2009
Guest post by Steven Goddard
The Telegraph has an article today about the latest addition to the UK wind energy grid, described as “Europe’s largest onshore wind farm at Whitelee.” The article says :

When the final array is connected to the grid later this week, there will be 140 turbines generating 322 megawatts of electricity. This is enough to power 180,000 homes.

Assuming the turbines are actually moving.  The problem is that on the coldest days in winter, the air is still and the turbines don’t generate much (if any) electricity.  Consider the week of February 4-10, 2009 in Glasgow.

Read the rest of this entry »


Comments : 284 Comments »

Categories : energy, weather

Something hinky this way comes: NCDC data starts diverging from GISS

18 05 2009

I got an email today from Barry Hearn asking me if I knew what was going on with the NCDC data set. It seems that it has started to diverge from GISS, and now is significantly warmer in April 2009.

What is interesting is that while NCDC went up in April,  UAH, and GISS both went down. RSS went up slightly, but is still much lower in magnitude, about 1/3 that of NCDC.  HadCRUT is not out yet.

Here is a look at the most recent NCDC data plotted against GISS data: Read the rest of this entry »


Comments : 129 Comments »

Categories : climate data