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| Titel |
Observations of the Atmospheric Boundary Layer Across the Land-Sea Transition Zone Using an Elastic Scanning Lidar |
| VerfasserIn |
Fei Gao, Klemen Bergant, Andrej Filipčič, Biagio Forte, Samo Stanič, Darko Veberič, Marko Zavrtanik |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033830
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| Zusammenfassung |
| In the case of uneven terrain, atmospheric effects in the land-sea transition zone are numerous
and diverse due to frequent changes in the wind direction and different effects of
the heat flux on the sea and land surface. Such a case is the coastal region of the
northernmost part of the Adriatic sea. Behind the coastal line the terrain rapidly rises
to a Karst plateau (about 300 m a.s.l.), falls into the Vipava valley (60 m a.s.l.)
and rises again to a mountainous region with maximum altitudes at about 1500 m
a.s.l.
To obtain complete meteorological status of the atmosphere in this region, a series of
remote sensing experiments of the atmospheric boundary layer (ABL) across the land–sea
transition zone were performed on 1 July 2009 using an elastic scattering lidar. The lidar
system, which has vertical scanning and long-range detection functionality, was located at
Otlica observatory in Slovenia, within 30 km of the coastal line and at an elevation of 945 m
a.s.l.
The atmosphere was scanned for elevation angles between 0- and 20- and the lidar data
was processed into Cartesian 2-dimensional range-height-indicator plots with a spatial
resolution of 50 m in both coordinates. Each pixel of the plot represents the weighted
logarithm range-squared-corrected signal at that position and contains all the atmospheric
information. Assuming horizontal atmospheric homogeneity, the optical depth, the extinction
coefficients and the height of the ABL were calculated.
The increase of the lidar detection range and the steepening of the optical depth profiles
with time were observed, showing that on average the extinction coefficients in the ABL were
decreasing during the experiment. The height of the ABL changed from 1.8 km to 0.55 km in
about 3 hours. Rapid drop of the ABL height indicates highly variable atmospheric
conditions in the land-sea transition zone and the adjacent mountainous region. |
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