Abstract
Surface albedo is one of the key parameters of land surface radiation and energy balance. As surface albedoes for visible and near-infrared solar radiation are quite different, solar radiation partitioning is important to parameterize the total surface albedo and upward solar radiation. In this paper, a surface albedo parameterization scheme was introduced and a solar radiation partitioning method was developed to improve the simulation of the upward solar radiation. The simulation results were validated in a hinterland site of the Taklimakan Desert. The surface albedo is not only associated with the soil moisture, but associated with the solar zenith angle. The solar radiation partitioning method considers the joint influences of cloud cover, near-surface air pressure, and solar zenith angle and was compared with the method using the Simple Biosphere Model version 3 (SiB3). The total albedo depends on the partitioning of the total visible and near-infrared radiations. The results indicate the surface albedo parameterization scheme is important to parameterize the upward solar radiation. The new solar radiation partitioning method could improve the simulation result.
Highlights
Surface albedo is defined as the surface reflected solar radiation divided by the surface incident solar radiation
As the near-infrared surface albedo is larger than the visible surface albedo, it could be deduced that the total albedo based on the Simple Biosphere Model version 3 (SiB3) solar partitioning method is smaller than that based on the integrated urban land model (IUM) default solar partitioning method
As the total albedo based on the SiB3 solar partitioning method is smaller than that based on the IUM default solar partitioning method, the SiB3-based solar radiation partitioning method could not improve but deteriorate the simulation result. e new solar radiation partitioning method could improve the simulation result, but the range is relatively small; the bias is reduced about 8.5%
Summary
Surface albedo is defined as the surface reflected solar radiation divided by the surface incident solar radiation It is one of the key parameters of land surface radiation [1] and energy balance [2, 3] and shapes the earth’s climate and climate change [4,5,6,7,8,9,10,11,12,13,14]. Many research results [20,21,22,23,24,25,26,27] show that surface albedo is associated with the soil moisture and soil color, and associated with the solar zenith angle. Ese four parts of solar radiation are associated with the solar zenith angle and the near-surface air pressure. In the Simple Biosphere Model version 3 (SiB3) [31,32,33], these four parts of solar radiation are associated with the cloud cover
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