HAR Data - important notice

Date: 03.11.2014

Dear HAR users,

the "High Asia Reanalysis" is changing name and is now called the "High Asia Refined analysis". The acronym HAR remains unchanged.

We have updated our website and the netcdf files metadata; we kindly ask you to refer to the dataset with it's new name whenever possible.

There are several reasons for this change, the most important being that we would not like to mislead the potential users who might misinterpret the use of the term "reanalysis. As explained in the Journal of Climate paper and in the HAR user guide, the HAR dataset is generated by dynamical downscaling of global analysis data (Final Analysis data from the Global Forecasting System; dataset ds083.2) using the Weather Research and Forecasting (WRF-ARW) model, run with the daily reinitialization strategy and without further assimilation of observations during the simulation time. The term "reanalysis" is not a trademark but commonly used atmospheric reanalyses indeed rely on variational assimilation, which is not the case with the HAR. This is not feasible without considerable resources, and it is unlikely that any kind of regional reanalysis using variational assimilation will be available for High Asia in the near future.

The new name of the HAR better reflects the objective of the Chair of Climatology at the TU Berlin, which is to recompute at higher resolution and in a physically based manner the state of the atmosphere in High Asia for the recent past. The term "analysis" corresponds to the fact that the dataset used to force the WRF model is the Final Analysis data from GFS, which is not a reanalysis dataset. Please be aware of this and realize your own evaluation of the HAR products before use.

It is likely that in the future the TU Berlin will provide a HAR dataset Version 2, with whenever possible improved results, higher resolution and driven with global reanalysis products. We will keep you informed about these changes.

We apologize for any inconvenience caused. Please contact us if you have any question.

All infos on the Chair of Climatology's website: www.klima.tu-berlin.de