Author Topic: Eyes on the Earth  (Read 1217 times)

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Offline ocala

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Eyes on the Earth
« on: January 28, 2010, 06:35:04 PM »
http://climate.nasa.gov/Eyes/eyes.html
Seems to have some GW implications but other stuff as well. Found it by accident. Just really starting to check it out.

blackjack52

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Re: Eyes on the Earth
« Reply #1 on: January 29, 2010, 10:02:14 AM »
Why don't they show the increase in Antarctic ice?

Offline W3DRM

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Re: Eyes on the Earth
« Reply #2 on: January 29, 2010, 01:09:20 PM »
Why don't they show the increase in Antarctic ice?

Lee,

Look at this NASA site that claims the Antartic ice pack is decreasing - not increasing...


And, if you go to the home page for the above site, all you see are indicators of global warming...


The real question IMHO is, who do (or can) we believe?

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blackjack52

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Re: Eyes on the Earth
« Reply #3 on: January 29, 2010, 05:11:14 PM »
Those figures were obtained from the satellites when they were miscalibrated. New figures haven't been incorporated by these special interests.
I know how important it is to have the same sensor calibrated the same way. Also, calibration can only account for so much. We had this problem while flying satellites with brand new sensors.

Satellite temperature measurements have been obtained from the troposphere since late 1978. By comparison, the usable balloon (radiosonde) record begins in 1958 but is less geographic coverage and is less uniform.

Satellites do not measure temperature as such. They measure radiances in various wavelength bands, which must then be mathematically inverted to obtain indirect inferences of temperature.[1][2] The resulting temperature profiles depend on details of the methods that are used to obtain temperatures from radiances. As a result, different groups that have analyzed the satellite data to calculate temperature trends have obtained a range of values. Among these groups are Remote Sensing Systems (RSS) and the University of Alabama in Huntsville (UAH). Furthermore the satellite series is not fully homogeneous - it is contstructed from a series of satellites with similar but not identical instrumentation. The sensors are subject to fade over time, and corrections are necessary for satellite drift in orbit. Particularly large differences between reconstructed temperature series occur at the few times when there is little temporal overlap between successive satellites, making intercalibration difficult.

To compare to the increase from the surface record (of approximately +0.07 C/decade over the past century and +0.17 C/decade since 1979) it is more appropriate to derive trends for the lower troposphere in which the stratospheric cooling is removed. Doing this, through July 2009:

RSS v3.1 finds a trend of +0.153 C/decade.[3]
UAH analysis finds +0.12C/decade.[4]