Fig. 6

Examples of the correction applied to the Kipp & Zonen PR1-V downwelling shortwave irradiance data, collected on two days with limited cloud cover. The step change seen in the uncorrected data at approximately 875 s (left) and 1520 s (right) are the combined result of a change in the HELiX yaw angle and slight calibration offset in the gimbal supporting the upward-looking sensor.