Tuesday, September 15, 2020

GISS August global down by 0.05°C from July.

The GISS V4 land/ocean temperature anomaly was 0.85°C in August 2020, down from 0.90°C in July. That compares with a 0.049deg;C fall in the TempLS V4 mesh index. Jim Hansen's report is here, discussing how 2020 is becoming less lokely to catch 2016 as hottest year. 2020 had the fourth warmest August in the record, behind 2016, 2017 and 2019.

As usual here, I will compare the GISS and earlier TempLS plots below the jump.

Here is GISS V4

And here is the TempLS V4 LOESS-based plot

This post is part of a series that has now run for seven years. The GISS data completes the month cycle, and is compared with the TempLS result and map. GISS lists its reports here, and I post the monthly averages here.
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 update my prediction for GISS temperature anomaly using data up to Aug20.
    SON20 0.99+-0.13
    J-D20 1.02+-0.05
    DJF21 1.01+-0.22
    MAM21 0.99+-0.19
    JJA21 0.95+-0.15

    Now the prediction gives a 53 % chance of a new record this year.
    Note that this may be on the high side if a La Nina develops, because it still does not use newer ENSO data yet (only old MEI).