Calculation Model Evaluation and Spatial-temporal Variations of Solar Radiation in Haihe Basin
Solar radiation is an important driving force in the process of the formation and evolution of climate system.It is of great significance to study the calculation model and spatial-temporal change of solar radiation.Based on the observation data of solar radiation at 6 stations and meteorological data of sunshine hours and temperature at 45 stations of Haihe basin during 1960-2012,four solar radiation calculation models are built.The average relative error and Nash-Sutcliffe equation are used as the model evaluation criterion.On this basis optimal model is used to calculate the multi-year monthly solar radiation at 45 stations,and then to research the spatial-temporal variations of solar radiation in Haihe basin.Resuits show that Angstrrom-Prescott model is the most suitable for global radiation estimation in Haihe basin.The annual solar radiation declines at a mean rate of-10 MJ ·m-2 ·a-1 in 1960--2012.Variations of solar radiation in four seasons all show a similarly significant decreasing trend,with highest decreasing rates in summer,then autumn,lowest in spring and winter.Spatially,multi-year average solar radiation during 1960--2012 is highest in the northwest part of the region,lowest in the southern region.Solar radiations at 44 stations (except for Fengning) show decreasing trend,while the largest decreasing rate is-27 MJ· m-2· a-1,mostly occur in the south central part of the region,where average solar radiation is the lowest.Increasing of air pollutants caused by human activity might be the main reason for the decline of solar radiation in Haihe basin.
solar radiationapplicability evaluationspatial-temporal variationHaihe basin
NETL
NSTL
万方数据
维普
