Multiwavelength lidar observation of thin cirrus at the base of the Pinatubo stratospheric layer during the EASOE Campaign
Year: 1994
Authors: Del Guasta M., Morandi M., Stefanutti L., Stein B., Kolenda J., Rairoux P., Wolf J.P., Matthey R., Kyro E.
Autors Affiliation: I.R.O.E. – C.N.R., Firenze, Italy; Freie Universitat Berlin, Germany; Switzerland; Finnish Meteorological Institute, Sodankyla, Finland
Abstract: Multiwavelength lidar measurements carried out in Sodankyl� (Finland, 66�N) during EASOE campaign showed high cirrus clouds growing at the base or within Pinatubo aerosol layer. The temperature was generally below -35�C. The mean peak depolarization at 532 nm for all the campaign was 28%, comparable to the values measured in polar cirrus clouds, observed in Dumont d\’Urville (Antarctica, 62�S) during 1989, well before the Pinatubo eruption. Optical depth at 532 nm was smaller than 0.3 (thin cirrus). A wavelength dependency was observed in EASOE cirrus backscattering, suggesting a major presence of submicron and micron-sized particles. Such a presence could explain the low depolarization values. Copyright 1994 by the American Geophysical Union.
Journal/Review: GEOPHYSICAL RESEARCH LETTERS
Volume: 21 (13) Pages from: 1339 to: 1342
KeyWords: Microphysical properties; Climatic implications; Cloud; Depolarization; Scattering; Particles
DOI: 10.1029/93GL03077
Citations: 12
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