Abstract
Land surface parameterizations (LSPs) are embedded in atmospheric numerical models and express the exchange of water and energy at the land surface. Under Global Soil Wetness Project (GSWP), the water balances in 1987 and 1988 were estimated by a few LSPs with common forcing data, such as precipitation and radiation. The estimates were validated by discharge data using the global river channel network, which was named Total Runoff Integrating Pathways (TRIP). As a result, the LSPs were found to calculate annual water balance fairly well where the forcing precipitation was estimated from enough density of raingauge observations (≥30/10(SUP)6(/SUP)km(SUP)2(/SUP)).
