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Behavior of cloud base height from ceilometer measurements

Given the importance of clouds in the climate, and the difficulty in determining their behavior and their contribution to climate change, there is a need for improvement of methods for automatic and continuous description of cloud characteristics. Ceilometers constitute a priori a reliable instrumental method for sounding the atmosphere and describing cloudiness, specifically cloud base height (CBH), cloud cover, and even cloud vertical structure. In the present study, the behavior of CBH at different time scales has been investigated at Girona (Spain) including a statistical analysis of the frequency distributions of CBH. The study covers four years (2007-2010) of high resolution (both in time and in the vertical direction) ceilometer measurements. At this location, ceilometer measurements reveal a seasonal cycle, with important differences between "extreme" seasons (winter and summer) and the "transition" seasons (spring and autumn). Summer months in general and July in particular behave quite differently than other periods in the year, both regarding the presence of clouds (with a minimum cloud occurrence of about 20-30%) and the distribution of CBH (with more than 25% of clouds having CBH around 1400. m and 80% of clouds with CBH lower than 3000. m). The distributions of CBH are explained on the basis of some atmospheric situations that generate clouds, in particular conditions that produce the large number of low level clouds found. © 2013 Elsevier B.V.

This research was funded by the Ministerio de Ciencia e Innovacion of the Spanish Government through grants CGL2007-62664 (NUCLIEREX) and CGL2010-18546 (NUCLIERSOL) projects. Visual observations of cloudiness used for comparison have been kindly provided by the Spanish Agenda Estatal de Meteorologia (AEMET). Montse Costa-Suros was supported by research fellowship FPI BES-2008-003129 from Ministerio de Ciencia e Innovacion of the Spanish Government

© Atmospheric Research, 2013, vol. 127, p. 64-76

Elsevier

Autor: Costa Surós, Montse
Calbó Angrill, Josep
González Gutiérrez, Josep Abel
Martin-Vide, Javier
Data: juny 2013
Resum: Given the importance of clouds in the climate, and the difficulty in determining their behavior and their contribution to climate change, there is a need for improvement of methods for automatic and continuous description of cloud characteristics. Ceilometers constitute a priori a reliable instrumental method for sounding the atmosphere and describing cloudiness, specifically cloud base height (CBH), cloud cover, and even cloud vertical structure. In the present study, the behavior of CBH at different time scales has been investigated at Girona (Spain) including a statistical analysis of the frequency distributions of CBH. The study covers four years (2007-2010) of high resolution (both in time and in the vertical direction) ceilometer measurements. At this location, ceilometer measurements reveal a seasonal cycle, with important differences between "extreme" seasons (winter and summer) and the "transition" seasons (spring and autumn). Summer months in general and July in particular behave quite differently than other periods in the year, both regarding the presence of clouds (with a minimum cloud occurrence of about 20-30%) and the distribution of CBH (with more than 25% of clouds having CBH around 1400. m and 80% of clouds with CBH lower than 3000. m). The distributions of CBH are explained on the basis of some atmospheric situations that generate clouds, in particular conditions that produce the large number of low level clouds found. © 2013 Elsevier B.V.
This research was funded by the Ministerio de Ciencia e Innovacion of the Spanish Government through grants CGL2007-62664 (NUCLIEREX) and CGL2010-18546 (NUCLIERSOL) projects. Visual observations of cloudiness used for comparison have been kindly provided by the Spanish Agenda Estatal de Meteorologia (AEMET). Montse Costa-Suros was supported by research fellowship FPI BES-2008-003129 from Ministerio de Ciencia e Innovacion of the Spanish Government
Format: application/pdf
ISSN: 0169-8095
Accés al document: http://hdl.handle.net/10256/9723
Llenguatge: eng
Editor: Elsevier
Col·lecció: MICINN/PN 2011-2014/CGL2010-18546
MEC/PN 2007-2010/CGL2007-62664
Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.atmosres.2013.02.005
Articles publicats (D-F)
És part de: © Atmospheric Research, 2013, vol. 127, p. 64-76
Drets: Tots els drets reservats
Matèria: Núvols
Clouds
Ceilòmetre
Ceilometer
Climatologia
Climatology
Títol: Behavior of cloud base height from ceilometer measurements
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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