Lidar ratios of stratospheric volcanic ash and sulfate aerosols retrieved from CALIOP measurements

Lidar Backscattering Measurements of Background Stratospheric Aerosols

Synchronous deposition of volcanic ash and sulfate aerosols over Greenland in 1783 from the Laki eruption (Iceland)

[1] Sulfate aerosols from the 1783–1784 A.D. Laki eruption are widely used as a reference horizon for constraining Greenland ice core time scales, yet the timing of the arrival of the sulfate remains under discussion. Two ice cores from western Greenland, analyzed with high temporal resolution, confirm that sulfate aerosols arrived over Greenland late in 1783, concomitant with the tephra, eleva...

Quantitative Shape Measurements of Distal Volcanic Ash

Large-scale volcanic eruptions produce fine ash (< 200 μm) which has a long atmospheric residence time (1 hour or more) and can be transported great distances from the volcanic source, thus, becoming a hazard to aircraft and public health. Ash particles have irregular shapes, so data on particle shape, size, and terminal velocities are needed to understand how the irregular-shaped particles aff...

Aerosols and Clouds: Long-term Database from Spaceborne Lidar Measurements

Stratospheric aerosol measurements by dual polarisation lidar

We present measurements of stratospheric aerosol made at Aberystwyth, UK (52.4 N, 4.06 W) during periods of background aerosol conditions. The measurements were made with a lidar system based on a 532 nm laser and two polarisation channels in the receiver. When stratospheric aerosol amounts are very small, as at present, this method is, potentially, free of a number of systematic errors that be...