Monday, August 3, 2020

NCEP/NCAR reanalysis July 2020 surface temperature down 0.01°C from June.

The Moyhu NCEP/NCAR index came in at 0.214°C in July, following 0.214°C in June, on a 1994-2013 anomaly base. June was well down on earlier months, so that makes a fairly cool period. I should mention that Karsten Haustein has commented that NCEP/NCAR seems to have gone off the rails. Certainly the recent cooling is more extreme than in other indices.

The main difference this month was that the heat seems to have gone from Siberia; most of Asia was cool, as was Northern Europe. A lot of Antarctica was relatively, but the South Atlantic was cold.

In blog housekeeping, I should warn that I have been intermittently restricting comments. This is because of a very persistent and annoying spammer. I hope it won't last too long, although I fear Google is not maintaining Blogger as enthusiastically as it once did.

This post is part of a series that has now run for some years. The NCEP/NCAR integrated average is posted daily here, along with monthly averages, including current month, and graph. When the last day of the month has data (usually about the 3rd) I write this post.
The TempLS mesh data is reported here, and the recent history of monthly readings is here. Unadjusted GHCN is normally used, but if you click the TempLS button there, it will show data with adjusted, and also with different integration methods. There is an interactive graph using 1981-2010 base period here which you can use to show different periods, or compare with other indices. There is a general guide to TempLS here.

The reporting cycle starts with a report of the daily reanalysis index on about the 4th of the month. The next post is this, the TempLS report, usually about the 8th. Then when the GISS result comes out, usually about the 15th, I discuss it and compare with TempLS. The TempLS graph uses a spherical harmonics to the TempLS mesh residuals; the residuals are displayed more directly using a triangular grid in a better resolved WebGL plot here.

A list of earlier monthly reports of each series in date order is here:
  1. NCEP/NCAR Reanalysis report
  2. TempLS report
  3. GISS report and comparison with TempLS

1 comment:

  1. I saw Karsten's earlier comment. It would be interesting to know some detail about what the issues actually are - simple difference from other indices is not necessarily enough to class as 'these bugs'.