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AGU: Journal of Geophysical Research, Atmospheres

 

Keywords

  • altitude effect
  • UVA and UVB radiation
  • UV Index
  • atmospheric aerosols
  • stratospheric ozone
  • broad and narrow band measurements

Index Terms

  • Atmospheric Composition and Structure: Radiation: transmission and scattering
  • Atmospheric Processes: Radiative processes
  • Atmospheric Processes: Instruments and techniques
  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Pollution: urban and regional
Abstract
Cited By (5)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 113, D23202, 11 PP., 2008
doi:10.1029/2007JD009742

Altitude effect in UV radiation during the Evaluation of the Effects of Elevation and Aerosols on the Ultraviolet Radiation 2002 (VELETA-2002) field campaign

Y. Sola

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

J. Lorente

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

E. Campmany

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

X. de Cabo

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

J. Bech

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

A. Redaño

Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain

J. A. Martínez-Lozano

Grupo de Radiación Solar, Departamento Física de la Tierra i Termodinámica, Universitat de València, Burjassot, Spain

M. P. Utrillas

Grupo de Radiación Solar, Departamento Física de la Tierra i Termodinámica, Universitat de València, Burjassot, Spain

L. Alados-Arboledas

Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, Granada, Spain

F. J. Olmo

Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, Granada, Spain

J. P. Díaz

Departamento de Física, Facultad de Ciencias, Universidad de La Laguna, La Laguna, Spain

F. J. Expósito

Departamento de Física, Facultad de Ciencias, Universidad de La Laguna, La Laguna, Spain

V. Cachorro

Grupo de Óptica Atmosférica, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain

M. Sorribas

Grupo de Óptica Atmosférica, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain

A. Labajo

Agencia Estatal de Meteorología, Madrid, Spain

J. M. Vilaplana

Departamento de Observación de la Tierra, Teledetección y Atmósfera, Estación de Sondeos Atmosféricos de El Arenosillo, INTA, Huelva, Spain

A. M. Silva

Centro de Geofisica de Évora, University of Évora, Evora, Portugal

J. Badosa

Grup de Física Ambiental, Departamento de Física, Escola Politècnica Superior, Universitat de Girona, Girona, Spain

The Evaluation of the Effects of Elevation and Aerosols on the Ultraviolet Radiation 2002 (VELETA-2002) field campaign was designed to study the influence of aerosols and altitude on solar UV irradiance. The altitude effect (AE) was evaluated for UV irradiance under cloudless conditions by taking spectral and broadband measurements in SE Spain in the summer of 2002 at three nearby sites located at different heights (680 m, 2200 m, and 3398 m). A spectral radiative transfer model (Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART)) was also applied, mainly to evaluate the tropospheric ozone impact on AE. Results are related to the optical properties and air mass origin of the aerosols as determined by back-trajectory analysis. During the 1-week observing period of the campaign, there were two main synoptic situations with different air masses (polar maritime and tropical continental air mass associated with a Saharan dust event). The AE showed a high dependency on wavelength, solar zenith angle, and aerosols, although the growth of the mixing layer during the day also caused substantial AE variability. Saharan dust caused an increase in AE, especially in the UVB region and in the erythemal irradiance. In the UVA (320–400 nm) band the AE ranged 6–8% km−1 at noon, while for the UVB (280–320 nm) band it reached 7–11% km−1. The AE for erythemally weighted irradiance ranged from 11 to 14% km−1 between the lowest and highest stations when it was calculated from spectral measurements.

Received 20 December 2007; accepted 4 September 2008; published 5 December 2008.

Citation: Sola, Y., et al. (2008), Altitude effect in UV radiation during the Evaluation of the Effects of Elevation and Aerosols on the Ultraviolet Radiation 2002 (VELETA-2002) field campaign, J. Geophys. Res., 113, D23202, doi:10.1029/2007JD009742.

Cited By

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