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- Title
Fog Detection and Estimation Using CALIPSO Lidar Observations.
- Authors
Qiao, Na; Wang, Lixin; Marais, Eugene; Li, Feng
- Abstract
Most fog detection from space cannot differentiate fog and low stratus clouds, and cannot estimate fog deposition. This study assessed the feasibility of using spaceborne lidar observations from the Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) in fog detection and estimation. We tested the method in the central Namib Desert, Namibia, where frequent fog events occur and fog observations are available. Results showed the CALIPSO backscatter signal at 532 nm can differentiate low clouds and fog due to its high‐resolution vertical profiles. Backscatter signals during fog events were significantly higher than those during non‐fog periods. The R2 between backscatter signals and fog observations was 0.85. Moreover, the backscatter signal was also sensitive to relative humidity variation (R2 = 0.66). These results indicate that the CALIPSO data are feasible to estimate fog occurrence and deposition, providing a new perspective for space‐based fog studies. Plain Language Summary: Fog is an important water resource for ecosystem productivity and functions in many dryland regions. Most fog detection from space cannot differentiate fog and low stratus clouds, and cannot estimate fog deposition. The spaceborne lidar measurements from Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation with high‐resolution vertical profiles provide a possibility to differentiate fog and low stratus clouds from space. A significant correlation was shown between spaceborne lidar signals and ground fog observations. Our findings can help investigate fog formation mechanisms as well as improve the capacity and accuracy of satellite‐based fog detection. Key Points: The first use of spaceborne lidar measurements to retrieve fog depositionThe Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation lidar observations with high‐resolution vertical profiles can differentiate fog and low cloudsThe spaceborne lidar measurements reflect the spatial features of fog and clouds, and can assist to investigate fog formation and identify fog types
- Subjects
NAMIB Desert (Namibia); NAMIBIA; LIDAR; STRATUS clouds; ARID regions; BACKSCATTERING; FOG; HUMIDITY
- Publication
Geophysical Research Letters, 2022, Vol 49, Issue 24, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2022GL101375