The effect of two adjustments on the climate record

kenskingdom

The warming bias in Australia’s ACORN-SAT maximum dataset is largely due to just two adjustments.

Last week’s Report of the Technical Advisory Forum’s review of the ACORN-SAT temperature reconstruction produced some rather bland, motherhood type statements.  However, hidden in the public service speak was a distinct message for the Bureau of Meteorology: lift your game.  Two of the areas I have been interested in are (a) whether individual adjustments are justified, and (b) the effect of these adjustments on national and regional temperature trends.  In this post I look at adjustments at just two sites, which are responsible for the single largest increase in national trend.

On page 17 of the Report we find the following graphic:

Fig. 1: Scatterplot of difference between AWAP and Acorn annual mean temperature anomalies.

scatterplot awap acorn mean diff

This is a clear statement of how much Acorn adjustments have cooled past temperatures, as AWAP is regarded as being…

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One thought on “The effect of two adjustments on the climate record”

  1. Strange that there’s an improvement in Arctic ice, yet models predict increasing fragility. If anything the Arctic loss slowdown should reduce the doominess of models. Usually models conform to reality not the other way around.

    Last two years has seen a recovery in volume:

    Arctic extent has boomed in the last month:

    http://ocean.dmi.dk/arctic/plots/icecover/icecover_current.png.

    No evidence changes in weather are influenced by CO2.

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