A comparative study of Rayleigh lidar performance

Gobbi, G.P. and Reali, L. (2002) A comparative study of Rayleigh lidar performance. Il nuovo cimento C, 25 (2). pp. 165-173. ISSN 1826-9885

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Abstract

Two co-located Rayleigh lidarsha ve been operated together to assess the quality of the middle-atmosphere temperature profiles obtained by this technique. Telescopes of the two systems have a 5 m2 and a 1.2 m2 collecting area, respectively. The smaller receiver has been implemented to replace the larger one in long-term observations of the middle-atmosphere temperature. A procedure to determine systems dead time is presented and characteristics of the dead-time correction are discussed. Temperature retrievals were performed at night with typical integration time of 2 hoursand vertical resolution of 2.7 km. Comparative results reveal a systematic temperature difference between the two instruments of approximately 0.1 K. Fluctuationsin temperature differencesw ell follow a Poissonian statistics at levels above 45 km. Below that altitude the temperature differences do not decrease with the same law but remain quasi-constant, at a level of about 0.7 K. We show that the systematic part of these differences is attributable to the dead-time correction of the larger receiver, the balance being caused by shot-noise in the smaller receiver. Therefore, the error of the new system is at most of 0.5 K below these levels. These results stress the importance of determining accurate signal corrections in Rayleigh lidar observations.

Item Type:	Article
Uncontrolled Keywords:	Climatology ; Atmospheric structure, pressure, density, and temperature (stratosphere, mesosphere, thermosphere, exosphere)
Subjects:	500 Scienze naturali e Matematica > 550 Scienze della Terra > 551.6 Climatologia e tempo atmosferico (Classificare qui i lo studio dei Cambiamenti climatici)
Depositing User:	Marina Spanti
Date Deposited:	12 Mar 2020 10:46
Last Modified:	12 Mar 2020 10:46
URI:	http://eprints.bice.rm.cnr.it/id/eprint/14785

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