Global Hawk's Cloud Physics Lidar Analyzed a Saharan Air Layer (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption The Global Hawk's Cloud Physics Lidar analyzed the Saharan Air Layer and showed an elevated dust layer (dark blue shading between 1.5 to 2.8 miles). The red shading beneath shows low-level clouds associated with Erin's remnants. Lighter shading near 9.3 miles are thin cirrus clouds. Credit NASA Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.