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Author Topic: Global Warming is WITH US  (Read 28117 times)

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AGelbert

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Re: Global Warming is WITH US
« Reply #90 on: August 01, 2014, 03:49:12 pm »
Glaciology
Data mix-up in sea-ice record
Nature 511, 510 (31 July 2014) doi:10.1038/511510b Published online 30 July 2014

SNIPPET:
The recent, mysterious expansion of Antarctic ice could be overestimated because of a data-analysis error, according to US scientists.

Ian Eisenman at the Scripps Institution of Oceanography in La Jolla, California, and his colleagues found the mistake when they compared two versions of satellite data on Southern Hemisphere sea ice that…
http://www.nature.com/nature/journal/v511/n7511/full/511510b.html

Agelbert begging  ;D: If any of you fellows with spare cash DO subscribe (or buy this article for $8   ) to this prestigious scientific journal called Nature, please give us the details on this story.

The huge and growing Antarctic FLOATING ice is a data point the GW deniers have been using (while IGNORING THE GREATER LOSS OF ICE on the Antarctic continent!) for some time. They need a knuckle sandwich for their mendacious duplicity.
 

Okay! I found the data FREE!   ;D Enjoy:
Quote

A recent paper investigated the processing of Antarctic sea ice data and how this affects the interpretation of Antarctic ice extent trends. While their findings do not affect NSIDC’s analysis of Antarctic sea ice extent, as we use a different data set, it is an interesting example of scientific rigor regarding data, and it does affect other reports of Antarctic sea ice trends.

The paper studied the Bootstrap algorithm, which has been used in several published reports of Antarctic trends, including the last two IPCC Assessment Reports. These reports suggested that the Antarctic sea ice extent shifted from a small, statistically insignificant upward trend in the early 2000s to a more substantial, and statistically significant upward trend in recent years. (NSIDC uses a different algorithm, called NASA Team, to estimate sea ice extent.)

The paper found that following an update to the algorithm in 2007, using the newer Version 2 of the Bootstrap algorithm produced Antarctic sea ice extent trends that were approximately two times larger than those derived using Version 1. Closer examination of the data showed a noticeable step change in extent at the point of transition to a new satellite sensor in 1991. This step change appeared to be related to an error in calibration between the sensors, rather than actually being an abrupt shift in Antarctic sea ice.

Trends derived from both versions for time periods either before or after the sensor transition are similar. However, the two algorithms produce different results when trends that span the 1991 sensor transition are calculated. Using Version 2 of the algorithm produces a markedly higher trend.

Using the newer version of the algorithm, Antarctic extent trends agree much more closely with the trends from the NASA Team algorithm used by NSIDC. Regardless, the expansion in Antarctic sea ice is confirmed by other groups using different techniques.

References

Eisenman, I., W. N. Meier, and R. J. Norris. 2014. A spurious jump in the satellite record: has Antarctic sea ice expansion been overestimated?, The Cryosphere 8, 1289-1296, doi:10.5194/tc-8-1289-2014.
 
Posted in Analysis   

http://nsidc.org/arcticseaicenews/
« Last Edit: August 06, 2014, 07:25:12 pm by AGelbert »
This poor man cried, and the Lord heard him, and saved him out of all his troubles.. -- Psalm 34:6

 

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