563 High resolution LDAS over CONUS using downscaled OLR precipitation

Thursday, 14 January 2016
Roshan Shrestha, NOAA NCEP, College Park, MD; and J. Dong, J. Meng, P. Xie, Y. Xia, and M. B. Ek

Improvement in the Land Data Assimilation System (LDAS) experiment is driven by the need to create more climatologically consistent data sets. The next generation LDAS is expected to take advantages of upgraded versions of Land Surface Models (LSMs), enhanced global meteorological forcing data sets, more robust soil moisture initialization, updated model specific parameter sets and an advanced snow data assimilation scheme. In this experiment, we are using NCEP CPC's one of the latest precipitation data sets, which has utilized a long-term climatology of outgoing longwave radiation (OLR) estimated from satellite observations to produce a blended precipitation product. This data set is 0.25-degree at a daily interval, which is further downscaled to higher resolution (3km spatial and hourly temporal resolution) through a hybrid-stochastic precipitation downscaling method. The OLR-based blending of precipitation is noticed to be capable of providing a globally uniform and temporally stable high quality product, similar to geostationary satellite IR-based estimates over the tropics and to estimates based on microwave scattering observations over extra-tropical areas. We will present results of fluxes and water budget components from a newly run high resolution LDAS experiment over CONUS.
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