Aerosol columnar properties retrieved from CIMEL radiometers during VELETA 2002

Autor(en)

Lucas Alados-Arboledas, Antonio Alcantara, Francisco J. Olmo, Jose A. Martinez-Lozano, Victor Estelles, Victoria Cachorro, Ana Maria Silva, Helmuth Horvath, Martin Gangl, Ana M. Diaz Rodriguez, Manuel Pujadas, Jeronimo Lorente, Antonio Labajo, Mar Sorribas, Giulia Pavese

Abstrakt

During the 2002 summer, the VELETA 2002 field campaign has been carried out at the Sierra Nevada Massif, close to Granada in South-Eastern Spain. During the campaign, CIMEL CE-318 robotic radiometer has been one of the key instruments in the characterization of the atmospheric aerosol columnar properties. This kind of radiometers have been operated at Motril, a coastal location at sea level, Pitres (1200 m a.s.l.), located in the South slope of Sierra Nevada Massif, Las Sabinas (2200m a.s.l.), located on the north slope of the mountain range, and Armilla (680m a.s.l.), located in the valley. The principal feature of the locations is that they provide a strong altitudinal gradient. This work presents the evolution of changes followed by the atmospheric aerosol in the vertical column. Columnar aerosol properties have been derived from the CIMEL CE-318 measurements obtained at the four stations. In this sense, the combination of solar direct measurements and sky radiances were used to retrieve the aerosol columnar size distributions by means of Nakajima's code. Marked changes in the atmospheric aerosol along the campaign have been explained in terms of the synoptic conditions. A detailed study of the columnar properties at the different places has been done. Changes in the spectral dependence of the single scattering albedo under the influence of different air masses have been discussed. The size distributions have been fitted to a bimodal lognormal distribution function model, and the associated parameters have been correlated with aerosol optical depth or Angstrom exponent. In some cases, it has been necessary to develop different correlations for cases affected or non-affected by the arrival of Saharan dust. In the case of Armilla (680 m a.s.l.) and Las Sabinas (2200 m a.s.l.), the small horizontal distance allow us to consider that both stations are representative of the same atmospheric column, a fact that has been used to analyse the daily evolution of the mixing layer in the north slope.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Universidad de Granada, Universitat de València, University of Valladolid, Universidade de Évora, Universidad de La Laguna, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Universitat Autònoma de Barcelona , Instituto Nacional de Meteorologia, Institute of Methodologies for Environmental Analysis - IMAA

Journal

Atmospheric Environment

Band

42

Seiten

2654-2667

Anzahl der Seiten

14

ISSN

1352-2310

DOI

https://doi.org/10.1016/j.atmosenv.2007.10.006

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5523fc7c-6c09-4374-a514-5d84bd9a669a