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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:22 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Investigation of the cloud cover and Planetary Boundary layer (PBL) characteristics using ceilometer CL-31
Authors:
Ioana Ungureanu
Affiliation:
University of Bucharest, Faculty of Physics, P.O.BOX Mg-11, Bucharest, Romania
E-mail
ioana_ungureanu_18@yahoo.com
Keywords:
ceilometer,clouds,aerosols,PBL.
Abstract:
The aim of the present paper is to show the applications of the Ceilometer measurements for knowledge of the cloudiness, cloud type and the other characteristics of the Planetary Boundary Layer (PBL). The PBL is the layer where earth’s surface interacts with the large scale atmospheric flow.
Ceilometer CL-31 is a mini-lidar used in remote sensing measurements, especially for the cloud bases.The measurements with Ceilometer were performed in Magurele (44.35 N, 26.03 E) for a long winter (November 2008-March 2009.The data were processed using, initial the CL-VIEW soft and then in order to obtain the imagines and vertical backscatter profiles
the Lab-view soft. The imagines allow determining the cloud types, the presence of the aerosol layers, precipitation and the fog.The processing of the imagines and the vertical profiles has shown the most cases of stratus clouds in this period. The statistics analysis shows the appearance of altocumulus clouds or cirrus clouds is smaller than the stratus clouds and is related to air mass advection. The special cases with precipitation or aerosol intrusions were discussed in connection with meteorological parameters using HYSPLIT4 model and synoptic situations.The large cloudiness and precipitation periods were confirmed by meteorological data. This emphasizes the applicability of the ceilometer’s data in characterizing of the PBL.
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