lidar observation of the 2011 puyehue-cordón caulle volcanic aerosols at lauder, new zealand
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2014
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Abstract
On 4 June 2011, the Puyehue-Cordón Caulle volcanic complex
(40.6° S, 72.1° W) in Chile erupted violently and injected
volcanic 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. The
purpose of our study is to quantify the influence of the volcanic ejections
from large eruptions, and we use the data from the ground-based lidar
observation. We analyzed lidar data at a wavelength of 532 nm and derived
the backscattering ratio and depolarization ratio profiles. During June and
July, within the altitude range of 10–15 km, the volcanic aerosols had high
depolarization ratios (20–35%), an indication of non-spherical volcanic
ash particles. The time series of the backscattering ratio during continuous
observations had three peaks occurring at about 12-day intervals: 26.7 at
11.2 km on 11 June, 18.1 at 12.0 km on 23 June, and 5.3 at 11.1 km on 6
July. The optical depth of the volcanic aerosols was 0.45 on 11 June, when
the continuous lidar observation started, 0.31 on 23 June, and 0.12 on 6
July. The depolarization ratio values remained high up to a month after the
eruption, and the small wavelength exponent calculated from the backscattering
coefficients at 532 nm and 1064 nm suggests that a major constituent of the
volcanic aerosols was large, non-spherical particles. The presence of
volcanic ash in the stratosphere might affect the error in Greenhouse gases
Observing SATellite (GOSAT) XCO2 retrieval using the 1.6 μm
band. We briefly discuss the influence of the increased aerosols on GOSAT
products.
| Reference Key |
nakamae2014atmosphericlidar
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|---|---|
| Authors | ;K. Nakamae;O. Uchino;I. Morino;B. Liley;T. Sakai;T. Nagai;T. Yokota |
| Journal | Journal of agricultural and food chemistry |
| Year | 2014 |
| DOI |
10.5194/acp-14-12099-2014
|
| URL | |
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