Tuesday, August 4, 2020

July global surface TempLS down 0.039°C from June.

The TempLS mesh anomaly (1961-90 base) was 0.75deg;C in July vs 0.789°C in June. This drop was less than the fall in the NCEP/NCAR reanalysis base index, which was 0.1°C. The UAH satellite data for the lower troposphere showed a small rise of 0.01°C.

Rather surprisingly, despite now three successive and substantial monthly falls, July 2020 was still the second warmest July in the record, not far behind 2019 (0.824°C).

Although I noted doubts about NCEP/NCAR's recent results, the pattern of anomalies was qualitatively similar to that of TempLS. Cool in a band extending N from India to the Arctic, and in N China/Japan. Cool in Argentina and S Atlantic, Scandinavia and in Alaska. Warm in Antarctica and E Canada/NE USA, and also around the Mediterranean, and in a band from Iraq through W Russia.

Here is the temperature map, using the LOESS-based map of anomalies.

As always, the 3D globe map gives better detail.

This post is part of a series that has now run since 2011. 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


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