Abstract
Ozone lidars measure continuous, high-resolution ozone profiles critical for process studies and for satellite validation in the lower troposphere. However, the effectiveness of lidar validation by using single-station data is limited. Recently, NASA initiated an interagency ozone lidar observation network under the name TOLNet to promote cooperative multiple-station ozone-lidar observations to provide highly timeresolved (few minutes) tropospheric-ozone vertical profiles useful for air-quality studies, model evaluation, and satellite validation. This article briefly describes the concept, stations, major specifications of the TOLNet instruments, and data archiving.
Highlights
The U.S EPA (Environmental Protection Agency) reports hourly surface ozone mixing ratios from a dense national ground-level monitoring network, upper-air ozone observations are extremely sparse
Lidar offers a number of significant advantages including continuous high spatial and temporal resolution vertical profiles, automated, high-quality retrievals under both day and nighttime conditions, and the ability to generate consistent, long-term, data sets
The lidar observations are critically important when a requirement exists for continuous ozone retrievals with high temporal and vertical resolution such as in the PBL where chemical and physical variations are both rapid and complicated
Summary
The U.S EPA (Environmental Protection Agency) reports hourly surface ozone mixing ratios from a dense national ground-level monitoring network, upper-air ozone observations are extremely sparse. Lidar offers a number of significant advantages including continuous high spatial and temporal resolution vertical profiles, automated, high-quality retrievals under both day and nighttime conditions, and the ability to generate consistent, long-term, data sets. Ground-based lidars, including mobile and fixed-station configurations, have lower operation cost than airborne lidars but have limited geographic coverage. This limitation motivates the development of a ground-based ozone lidar network to make simultaneous ozone profiling at multiple locations for process studies, model evaluation and satellite validation at reasonable cost. TOLNet contributes to intensive field campaigns such as DISCOVERAQ, and development of future satellite missions GEOstationary Coastal and Air Pollution Events (GEO-CAPE), and Tropospheric Emissions: Monitoring of Pollution (TEMPO)
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