16 February 2004 Determination of the mixing layer height from regular lidar measurements in the Barcelona area
Author Affiliations +
Proceedings Volume 5235, Remote Sensing of Clouds and the Atmosphere VIII; (2004); doi: 10.1117/12.511481
Event: Remote Sensing, 2003, Barcelona, Spain
Abstract
Regular aerosol backscatter measurements using an elastic-backscatter lidar were performed between May 2000 and November 2002 in Barcelona (Spain), in the frame of EARLINET (European Aerosol Research Lidar Network). The mixing layer height, required to understand the chemical and physical processes taking place in the low troposphere, was one of the major parameters to be retrieved. Three analytic definitions of the ML height have been tested using the range squared-corrected lidar signal: (1) the minimum of its first derivative, (2) the minimum of its second derivative, and (3) the minimum of the first derivative of its logarithm. The strong coastal and orographic influences and the climatological settling of Barcelona determine the complexity of its atmospheric boundary layer dynamics and the high heterogeneity of the lidar signals. Therefore, single lidar analyses do not allow an unambiguous determination of the mixing layer height in many cases and complementary data are needed, such as synoptic maps, backtrajectories, radiosoundings and solar irradiance profiles. The resulting mixing layer heights were compared to radiosoundings, and the second method was found to give statistically the best results. This definition was used to process the whole dataset. A number of 162 days and 660 profiles were examined. The mixing layer height was inferred in cases such as low clouds, Saharan dust events and sea breeze and mountain induced recirculation. Variations between 300 and 1450 m were observed over the three years.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Sicard, Carlos Perez, Adolfo Comeren, Jose Maria Baldasano, Francesc Rocadenbosch, "Determination of the mixing layer height from regular lidar measurements in the Barcelona area", Proc. SPIE 5235, Remote Sensing of Clouds and the Atmosphere VIII, (16 February 2004); doi: 10.1117/12.511481; https://doi.org/10.1117/12.511481
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
LIDAR

Aerosols

Clouds

Climatology

Troposphere

Atmospheric particles

Backscatter

Back to Top