GHCN-M adjustment samples: (5xx) Pacific and Australasia

For details of what is illustrated here, start from Wanderings of a Marseille January 1978 temperature, according to GHCN-M, continue with GHCN-M: Stations similar to Marseille/Marignane

Further discussion to come later once images have been generated and added for remaining regions.

501 Australia (586)

Richmond
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GHCN-M adjustment samples: (4xx) Central and North America

For details of what is illustrated here, start from Wanderings of a Marseille January 1978 temperature, according to GHCN-M, continue with GHCN-M: Stations similar to Marseille/Marignane  Pairwise Homogenization may perform better in Canada and the United States of America. This is not unexpected − pairwise homogenization was benchmarked for the United States. (C. N. Williams, M. J. Menne, P. W. Thorne, Benchmarking the performance of pairwise homogenization of surface temperatures in the United States. J. Geophys. Res. 117 (D5), D05116 (2012). doi:10.1029/2011JD016761). Further discussion to come later once images have been generated and added for remaining regions.

Update: As I have started to archive USHCN data as well as GHCN-M data, an example of USHCN adjustment is also shown below for one station (Sacerton). Continue reading

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GHCN-M adjustment samples: (3xx) South America

For details of what is illustrated here, start from Wanderings of a Marseille January 1978 temperature, according to GHCN-M, continue with GHCN-M: Stations similar to Marseille/Marignane

301 Argentina (90)

LaQuiaca
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GHCN-M adjustment samples: (2xx) Asia

For details of what is illustrated here, start from Wanderings of a Marseille January 1978 temperature, according to GHCN-M, continue with GHCN-M: Stations similar to Marseille/Marignane

203 Bangladesh (23)

Chittagong

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GHCN-M: Stations near Marseille/Marignane but beyond the GISS list

This post is intended to supplement the main post Wanderings of a Marseille January 1978 temperature, according to GHCN-M, which should be read first. An explanation for the choice of January 1978 will be found in that post. (Gistemp values have not yet been extracted and added for all stations below)

Going further than the GISS list in the main post  (more stations will be added here)Dijon
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GHCN-M adjustment samples: (1xx) Africa

This post is intended to supplement the main post Wanderings of a Marseille January 1978 temperature, according to GHCN-M, which should be read first. An explanation for the choice of January 1978 will be found in that post.

This is not, nor is it intended to be, an exhaustive list of all stations showing “volatile” adjustments similar to those at Marseille/Marignane. I have selected one or two stations from most countries, which have stations showing such “volatile” adjustments. Generally these show adjustments similar to Marseille, frequent substantial changes moving above and below the unadjusted value. As there are many such stations, I will break up this post into sections by ‘continent’. The number of GHCN-M stations in each country follows the country name below.

Further discussion, and more stations, to be added in coming weeks

101 Algeria (50)

DarElBeida
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Wanderings of a Marseille January 1978 temperature, according to GHCN-M

This post will be updated from time to time as further GHCN-M data is archived.

Last updated December 17th 2015 (plots brought up to date to December 10th)

Temperatures quoted by NOAA and others are “what would have been measured in the past by systems in use today”, so it is not unreasonable for the numbers to change frequently.

It does however seem unreasonable that these past numbers should change quite drastically overnight, then in a short time again change quite drastically overnight, then in another short time …

MarseilleJan78

Click the image (and later images) to view full-size

That green box shown early in 2015 corresponds to a sudden jump in the GHCN-M adjusted value for January 1978, from 5.78°C on January 5th 2015 to 6.41°C on January 6th 2015, followed by a similar drop, from 6.49°C on February 9th 2015 to 5.77°C on February 10th 2015. Note how the January 1978 temperature changes frequently in GHCN-M v3, even overnight, and that the changes may include correction for both “urban heating” and “urban cooling”, seen when the adjusted value become greater than or less than the unadjusted value [My understanding is that Pairwise Homogeneity Adjustment may also include adjustment for urban heating/cooling as well as instrument changes, relocation, TOBS correction, etc]. Anyone willing to suggest station relocations take place this frequently? Problems with Pairwise Homogeneity Adjustment seem more likely.

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