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Global Temperature Updates–September 2013

October 31, 2013

By Paul Homewood

 

 

  RSS UAH HADCRUT4 GISS NCDC
Sep 2013 0.26 0.37 0.53 0.74 0.64
Change from last month 0.09 0.21 0.00 0.13 0.03
12 month running average 0.23 0.25 0.47 0.59 0.59
Average 2003-12 0.24 0.19 0.48 0.58 0.59

 

A bit of a mixed bag this month. GISS is up sharply, but the other surface datasets, HADCRUT and NCDC remain flat. Nevertheless, the 12-Month average for all three is just about bang on the 10-Year average for 2003-12. Bear in mind , as well, that the last 12 months have been ENSO neutral.

On the satellite sets, UAH continues to diverge from RSS, and is the only set to show a significant rise from the 2003-12 baseline. This divergence has occurred since UAH brought out their new Version 5.6, and it is worth pointing out that the old Version 5.5, which is still being kept running, shows a September anomaly of 0.30, much more in line with RSS.

 

Notice I have also introduced NCDC in to the analysis this month. NCDC and GISS both use the GHCN V3.2 dataset for land temperature anomalies, which GISS then adjust to allow for urban heat island effects. I will be doing a more detailed comparison of the two in the next day or two.

Graphs below.

 

 

 

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http://data.remss.com/msu/monthly_time_series/RSS_Monthly_MSU_AMSU_Channel_TLT_Anomalies_Land_and_Ocean_v03_3.txt

http://vortex.nsstc.uah.edu/data/msu/t2lt/uahncdc_lt_5.6.txt

http://www.metoffice.gov.uk/hadobs/hadcrut4/data/current/download.html#regional_series

http://data.giss.nasa.gov/gistemp/

http://www.ncdc.noaa.gov/cag/

from → Global Temperature Updates
3 Comments
  1. Brian H permalink
    November 1, 2013 3:31 am

    Gah. UHI adjusted monthly anomalies are higher than unadjusted? Gimme a break! Someone is lying through their incisors and bicuspids.

  2. QV permalink
    November 1, 2013 8:54 am

    One of the main reasons for the large increase in GISS/UAH anomalies, compared with NOAA/RSS/HC4, seems to be the different coverage/methodology of calculating the South Polar anomalies, which has a major influence on the Southern Hemisphere figures.

    We must also not forget that all of the different datasets are relative to different base periods and therefore cannot be compared with one another without adjustment to the same base period.

    • Paul Homewood permalink*
      November 1, 2013 11:33 am

      Yes good point.

      UAH go down to 85S, whereas RSS only go to 70S.

      The increase from Aug to Sep is :-

      UAH 60S to 85S = 0.98C

      RSS 60S to 70S = 0.07C

      As we know, when ice freezes, the air above it warms up, so maybe there is a link here. We also know that large temperature changes at the poles result from very small changes in kinetic energy, and therefore are not comparable to similar temperature changes at lower latitudes.

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