Each month, as new station data come in, NCDC runs their pairwise
homogenization algorithm which looks for non-climatic breakpoints by comparing each station to its surrounding stations.
Not exact matches
The U.S. HCN version 2 «pairwise»
homogenization algorithm addresses these and other issues according to the following steps,
which are described in detail in Menne and Williams (2009).
In a future post I will address the pairwise
homogenization algorithm,
which attempts to correct for factors like the MMTS transition and the impact of urbanization on temperature trends.
We've found evidence that GHCN's
algorithm for
homogenization is reducing the trend of several important stations in the Arctic
which are very important to GHCN based datasets because they have less coverage than CRU (by a large margin).