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On 4 June 2011, the Puyehue-Cordón Caulle volcanic complex(40.6° S, 72.1° W) in Chile erupted violently and injectedvolcanic aerosols into the atmosphere. For the safety of civil aviation,continuous lidar observations were made at Lauder, New Zealand(45.0° S, 169.7° E), from 11 June through 6 July 2011. Thepurpose of our study is to quantify the influence of the volcanic ejectionsfrom large eruptions, and we use the data from the ground-based lidarobservation. We analyzed lidar data at a wavelength of 532 nm and derivedthe backscattering ratio and depolarization ratio profiles. During June andJuly, within the altitude range of 10–15 km, the volcanic aerosols had highdepolarization ratios (20–35%), an indication of non-spherical volcanicash particles. The time series of the backscattering ratio during continuousobservations had three peaks occurring at about 12-day intervals: 26.7 at11.2 km on 11 June, 18.1 at 12.0 km on 23 June, and 5.3 at 11.1 km on 6July. The optical depth of the volcanic aerosols was 0.45 on 11 June, whenthe continuous lidar observation started, 0.31 on 23 June, and 0.12 on 6July. The depolarization ratio values remained high up to a month after theeruption, and the small wavelength exponent calculated from the backscatteringcoefficients at 532 nm and 1064 nm suggests that a major constituent of thevolcanic aerosols was large, non-spherical particles. The presence ofvolcanic ash in the stratosphere might affect the error in Greenhouse gasesObserving SATellite (GOSAT) XCO<sub>2</sub> retrieval using the 1.6 μmband. We briefly discuss the influence of the increased aerosols on GOSATproducts

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand