Airborne lidar measurements of ozone and aerosols in the summertime Arctic troposphere

摘要

Abstract: Ozone (O$-3$/) and aerosol distributions were remotely measured from an aircraft using a differential absorption lidar (DIAL) system as part of the 1988 NASA Global Tropospheric Experiment - Arctic Boundary Layer Experiment (ABLE-3A). The airborne DIAL system made simultaneous measurements of O$-3$/ and aerosols from the surface to above the tropopause. These measurements were made in a broad range of atmospheric conditions over the tundra, ice, and ocean regions near Barrow and Bethel, Alaska, during July and August, 1988. The tropospheric composition over the Arctic was found to be strongly influenced by stratospheric intrusions. Regions of low-aerosol scattering and enhanced O$-3$/ mixing ratios were usually correlated with descending air from the upper troposphere or lower stratosphere. Several cases of enhanced O$-3$/ were observed during ABLE-3A in conjunction with enhanced aerosol layers in the free troposphere resulting from biomass burning. As was found in the Amazon, the products of biomass burning can significantly alter O$-3$/ concentrations in the troposphere. This paper describes the NASA airborne DIAL system and discusses the large-scale variations of O$-3$/ and aerosols observed with the airborne DIAL system during ABLE-3A.!