The Global Land Data Assimilation System Version 2 (GLDAS-2) data set, consisting of 1o
3-hourly and monthly NOAH model data (GLDAS_NOAH10_3H_E1.002
), has been released. This data set currently has temporal coverage from January 1948 to December 2008; it will soon be extended up to the present time. The data set is accessible via the Hydrology Data Holdings page at the Goddard Earth Sciences Data and Information Services Center, http://disc.sci.gsfc.nasa.gov/hydrology/data-holdings
. GLDAS-2 data from other models will also be available soon in the GES DISC data system.
Furthermore, it is planned that GLDAS-2 will include multiple experiments for the NOAH model (the current release is for GLDAS-2 NOAH Experiment 1). The GLDAS-2 README Document is available at http://disc.sci.gsfc.nasa.gov/hydrology/documentation
and will be updated as new data become available.
Motivated by the need to create more climatologically-consistent data sets, GLDAS-2 data have been generated using upgraded versions of Land Surface Models (LSMs). Compared with GLDAS-1, the GLDAS-2 data set has been enhanced by using the global meteorological forcing data set from Princeton University (Sheffield et al., 2006); initialization of soil moisture over desert; updated model specific parameter files; and an advanced snow assimilation scheme (in NOAH0.25). By using the Princeton forcing data set, GLDAS-2 temporal coverage is extended back to 1948. With this extended temporal coverage, the GLDAS-2 data are expected to play an even more important role in global hydrology and climate studies.
Where it rains and where it doesn't: Mean total precipitation fields (surface rainfall + surface snowfall) from 1ox1o monthly GLDAS-1 NOAH model (top) and GLDAS-2 NOAH model Experiment 1 (bottom) over 1979 to 2008. Click on either image to see a larger version.