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Land
Data
Assimilation
Systems
(LDAS)
North American (NLDAS) and Global (GLDAS) LDAS systems are being developed that
will lead to more accurate reanalysis and forecast
simulations by numerical weather prediction (NWP) models. Specifically, these
systems will reduce the errors in the stores of soil moisture and energy
which are often present in NWP models and which degrade the accuracy of
forecasts. NLDAS is currently running retrospectively and in near real-time on a 1/8th-degree grid
while GLDAS is running at 1/4 degree resolution. The systems are currently forced by
terrestrial (NLDAS) and space based (GLDAS) precipitation data, space-based
radiation data and numerical model output. In order to create an optimal
scheme, the projects involve several LSMs, many sources of data, and several institutions.
Data from the project can be accessed on the NLDAS and GLDAS forcing
pages, the NLDAS and GLDAS model output pages, as well as on the NLDAS
Realtime Image Generator page.
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