Feeds

Painting by numbers: NASA's peculiar thermometer

What's the temperature, Kenneth?

Intelligent flash storage arrays

Analysis The story is that the world is heating up - fast. Prominent people at NASA warn us that unless we change our carbon producing ways, civilisation as we know it will come to an end. At the same time, there are new scientific studies showing that the earth is in a 20 year long cooling period. Which view is correct? Temperature data should be simple enough to record and analyze. We all know how to read a thermometer - it is not rocket science.

Previously we looked at how US temperature data sets have been adjusted - with more recent versions of historical data sets showing a steeper rise in temperature than they used to. Here, we'll be looking at current NASA data and why their temperature maps appear hot-red, even when others are cool-blue.

To recap the earlier article, the graph below shows additional adjustments to the data set since the big "correction" in 2000.

NASA's temperature adjustments since 2000

We observe that the data has been consistently adjusted towards a bias of greater warming. The years prior to the 1970s have again been adjusted to lower temperatures, and recent years have been adjusted towards higher temperatures.

NASA's published data is largely based on data from the US Historical Climatology Network (USHCN), which derives its data from thermometer readings across the country. According to USHCN literature, the raw temperature data is adjusted to compensate for geographical movements in the weather stations, changes in the 24-hour start/end times when the readings are taken, and other factors. USHCN is directly affiliated with the Oak Ridge National Laboratories' Carbon Dioxide Information Analysis Center, an organisation which exists primarily to promote the idea of a link between CO2 and climate.

The map below shows what the raw unadjusted USHCN temperature trends for the US in the 20th century looked like.

20th century temperature trends - USHCN raw data (lots of blue)

20th century temperature trends - USHCN raw data (lots of blue)

Prior to any adjustments, more than half the US shows declining temperatures over the 20th century - blue and green colors - i.e. the US is cooling down. However, subsequent to the adjustments the country goes dominantly warmer (red and yellow) - as seen in the image below.

20th Century temperature trends - USHCN raw data (lots of red)

20th Century temperature trends - USHCN raw data (lots of red)

Below is a video showing the USHCN adjustments in action.

Divergence

So how does NASA's data compare with other temperature sources? As we explained in our earlier article, NASA data is derived from a grid of ground-based thermometers. During the last thirty years, we also have the benefit of more sophisticated technology - satellites which can indirectly record temperatures across most of the planet. The satellite data is from Remote Sensing Systems (RSS) and the University of Alabama at Huntsville (UAH).

In 1998 (left side of the graph below) NASA and the satellite data sources RSS and UAH all agreed quite closely - within one-tenth of a degree. Ten years later - in March 2008 - NASA is reporting temperature anomalies more than 0.5 degrees warmer than UAH. The divergence between NASA and UAH has increased at a rate of 0.13 degrees per decade (red lines below.) In contrast, RSS has converged with UAH over the period and is now within 0.02 degrees (blue lines below.)

Differences between reported temperature anomalies, NASA, RSS and UAH - with UAH as the baseline.

Differences between reported temperature anomalies, NASA, RSS and UAH - with UAH as the baseline.

Lost Continents

The divergence is now quite striking. Looking closer at March 2008, NASA's data shows the month as the third warmest on record. In sharp contrast, UAH and RSS satellite data showed March as the second coldest on record in the southern hemisphere, and just barely above average for the whole planet. How could such a large discrepancy occur?

Intelligent flash storage arrays

Next page: Cherry picking

More from The Register

next story
MARS NEEDS WOMEN, claims NASA pseudo 'naut: They eat less
'Some might find this idea offensive' boffin admits
Boffins who stare at goats: I do believe they’re SHRINKING
Alpine chamois being squashed by global warming
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
No sail: NASA spikes Sunjammer
'Solar sail' demonstrator project binned
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
prev story

Whitepapers

Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.