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Relationships between the ground surface VIS, NIR, and GR albedos and the solar elevation angle, and between the albedos and the surface soil moisture at 5 cm depth at the Gobi field observation site during the IOP, (a) and (b) the VIS, (c) and (d) the NIR, and (e) and (f) the GR, respectively. The solar elevation angle is shown in degree units, and the soil moisture at a 5 cm depth is shown in m3/m3 units.
