The 20th Century Reanalysis version 2 (20CRV2) is an effort led by PSL and the CIRES at the University of Colorado to produce a reanalysis dataset
spanning the entire twentieth century, assimilating only surface observations of synoptic pressure, monthly sea surface temperature and sea ice
distribution. V1 was initially completed as a test from 1950-1958. V2 covers the period from 1871-2012 . The model used is a 2008 experimental,

The 20th Century Reanalysis version 2c (20CRV2c)is an effort led by PSL and the CIRES at the University of Colorado to produce a reanalysis dataset
spanning the entire twentieth century, assimilating only surface observations of synoptic pressure, monthly sea surface temperature and sea
ice distribution. V1 was initially completed as a test from 1950-1958. V2 covers the period from 1871-2012 . The model used is a 2008 experimental,

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The NOAA 1/4° daily Optimum Interpolation Sea Surface Temperature (or daily OISST) is an analysis constructed by combining observations from
different platforms (satellites, ships, buoys) on a regular global grid. A spatially complete SST map is produced by interpolating to fill in gaps.
Data starts in 1981 and is updated to near present.

Data is from NCEP It consists of OLR uninterpolated from 2x/day

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In situ data: ICOADS2.5 before 2007 and NCEP in situ data from 2008 to present. Ice data: HadISST ice before 2010 and NCEP ice after 2010.

The NOAA Global Surface Temperature Dataset (NOAAGlobalTemp) is a merged land&ocean surface temperature analysis (formerly known as
MLOST) It is a spatially gridded (5° - 5°) global surface temperature dataset, with monthly resolution from January 1880
to present. We combine a global sea surface (water) temperature (SST) dataset with a global land surface air temperature dataset into this merged
dataset of both the Earth's and land's and ocean surface temperatures. The SST dataset is the Extended Reconstructed Sea Surface Temperature

Subjectively identified areas of large-scale organized convection over the global tropics (25N-25S) have been gridded daily for a 15-year period from 1971 to 1988.

Data is interpolated in time and space from NOAA twice-daily OLR values and averaged to once daily