GEWEX Americas Prediction Project

Project Description
The GAPP program (GEWEX [Global Energy and Water Cycle
Experiment] America Prediction Project) objectives are to make
monthly to seasonal predictions of the hydrological cycle and to
use these improved predictions for better water resources
management. The first objective largely involves improving the
land surface, hydrology, and boundary layer representations of
models used for climate prediction through improved
understanding of the hydrological processes, feedbacks between
the land and atmosphere, model transferability, and development
of a comprehensive modeling system. The second objective
involves scaling the climate model output to make it useful for
water resource managers, improved understanding of the links
between hydrologic predictions and water resources management,
including the use of demonstration projects, and better
understanding of the effects of land surface changes on the
regional hydrology. Two major new initiatives will be the
effect of orography ! on the hydrological cycle of the Western
Cordillera and the predictability of the North American Monsoon
(NAMS) and its effects on summer precipitation over the USA.
The other components all relate to improving the predictability
of the hydrological cycle with special regards to the land
surface and the role of predictions for water resources

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