In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 19, No. 9 ( 2019-05-10), p. 6217-6233
Kurzfassung:
Abstract. Within this publication, lidar observations of the vertical aerosol
distribution above Punta Arenas, Chile (53.2∘ S and
70.9∘ W), which have been performed with the Raman lidar
PollyXT from December 2009 to April 2010, are presented. Pristine
marine aerosol conditions related to the prevailing westerly circulation
dominated the measurements. Lofted aerosol layers could only be observed
eight times during the whole measurement period. Two case studies are
presented showing long-range transport of smoke from biomass burning in
Australia and regionally transported dust from the Patagonian Desert,
respectively. The aerosol sources are identified by trajectory analyses with
the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and
FLEXible PARTicle dispersion model (FLEXPART). However, seven of the eight
analysed cases with lofted layers show an aerosol optical thickness of less
than 0.05. From the lidar observations, a mean planetary boundary layer (PBL)
top height of 1150 ± 350 m was determined. An analysis of particle
backscatter coefficients confirms that the majority of the aerosol is
attributed to the PBL, while the free troposphere is characterized by a very
low background aerosol concentration. The ground-based lidar observations at
532 and 1064 nm are supplemented by the Aerosol Robotic Network (AERONET)
Sun photometers and the space-borne Cloud-Aerosol Lidar with Orthogonal
Polarization (CALIOP) aboard the Cloud-Aerosol Lidar and Infrared Pathfinder
Satellite Observation (CALIPSO). The averaged aerosol optical thickness (AOT)
determined by CALIOP was 0.02 ± 0.01 in Punta Arenas from 2009 to 2010.
Materialart:
Online-Ressource
ISSN:
1680-7324
DOI:
10.5194/acp-19-6217-2019
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2019
ZDB Id:
2092549-9
ZDB Id:
2069847-1
