Error in Princeton Data 1901-1947

Posted on Dec. 1, 2015

It has been brought to our attention that the version of the Princeton data set used so far within ISI-MIP2.1a for the time period 1901-1947 has been replaced by a new version by the producers of the data.

The version made available for ISI-MIP contains some fairly significant departures from the new version for the variables tas, tasmin, tasmax and shum (specific humidity).  We cannot yet tell you what the source of the error is, but we are endeavouring to find out from the producers of the data.

Since the changes only affect the first half of the 20th century, and the ISI-MIP reporting starts in 1971, we hope that this will affect at most a small subset of you - most likely Biomass models with long spin-up requirements.

We are in the process of doing some test runs with the LPJmL model, to assess the potential effect on results for the reporting period when using the updated 1901-1947 data.  We will share the results of these analyses with you as soon as they are complete.

At this stage we ask you to not perform any new runs with the 1901-1947 Princeton data (if you only need later data from 1948 onwards, go ahead!). We will be in touch again very soon with regards to how to proceed.