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| Titel |
Some statistical properties of lidar measurements in the Atmospheric Boundary Layer |
| VerfasserIn |
Francesco Cairo, Alessandra Sabina Lanotte, Federico Fierli, Chiara Antonucci, Luca Di Liberto, Camillo Cammarota |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088816
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| Publikation (Nr.) |
 EGU/EGU2014-2976.pdf |
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| Zusammenfassung |
| We analyzed time series of lidar profiles to investigate the morphology, the evolution and
dynamical characteristics of the Planetary Boundary Layer (PBL) using aerosols as tracers of
motion. The lidar data provided the temporal evolution of the vertical distribution of aerosols,
from the ground up to an altitude of 3 km, with a vertical resolution of 3.75 m
and a temporal resolution of 1 s, and were acquired for little more than one hour,
during some summer day in a field near Rome. The height of the PBL was computed
with the gradient method and the Haar wavelet transform method. We produced
profiles of variance, skewness, kurtosis of the fluctuations of the time series of the
signal at various altitudes. The fluctuations deviate from a Gaussian distribution
within the PBL, while are Gaussian in the free troposphere. The power spectra in the
diurnal PBL scales as f-5-3 and the autocorrelation is not zero, with an integral
time scale between 20 and 40 s. This suggests that part of the inertial subrange
can be detected and the turbulent fluctuations can be resolved. The study of the
structure functions at various altitudes showed a pattern consistent with the presence of
turbulence. |
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