One year of cloud lidar data from Dumont d\’Urville (Antarctica) 1. General overview of geometrical and optical properties
Anno: 1993
Autori: Del Guasta M., Morandi M., Stefanutti L., Brechet J., Piquad J.
Affiliazione autori: CNR – Istituto di Ricerca Onde Elettromagnetiche, Via Panciatichi 64, 50127 Firenze, Italy
Abstract: Tropospheric clouds play a major role in climate regulation but, so far, only a few long-term ground-based observations, devoted to the study of the cloud optical and radiative properties, have been carried out. In this work the statistics of one year of coastal Antarctic cloud lidar measurements (532 nm) are shown. Cloud macrophysical and optical parameters have been retrieved from lidar returns; radiosonde data allowed us to build statistics of such quantities in terms of cloud temperature. Information about the physical phase of water and ice crystal habit has been otbained from the depolarization and extinction/backscattering ratio; a change in crystal habit (and/or size) around -30°C is evidenced by the depolarization versus temperature behaviour. The extinction/backscattering ratio shows a negative trend with temperature, reflecting microphysical changes. Visible extinction shows wide data dispersion, but with a marked negative trend with temperature. The relative derivatives of extinction and optical depth with temperature have been computed, such quantities result quite constant with temperature. -Authors
Giornale/Rivista: JOURNAL OF GEOPHYSICAL RESEARCH
Volume: 98 (D10) Da Pagina: 18575 A: 18587
Parole chiavi: Cloud; geometrical property; lidar; optical property; trophosphere, Antarctica; Dumont d\’UrvilleDOI: 10.1029/93JD01476Citazioni: 38dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui