Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.

Issue 7, 2013
Previous Article Next Article

Spectral UV radiance measured at a coastal site: a case study

Author affiliations


We have sampled the spatial distribution of the UV radiation (i.e. the UV radiance) at a station located on the southern pacific coastline (Valparaiso, Chile, 33.03°S–71.58°W). The site is characterized by the partial horizon obstruction (due to the surrounding topography). Our spectral measurements were carried out over the period January–March 2012 and were meant to weigh up the effects of the local cloudiness, the heterogeneous albedo, and the horizon obscuration. We found that a nearly translucent overcast sky affects the radiance distribution such that from its maximum (measured close to the solar zenith angle) the radiance is monotonically decreasing towards the horizon. Under cloudless conditions, the radiance distribution becomes less isotropic with the wavelength; we detected spatial variations in the distribution of radiation up to a factor of 5 at 320 nm, and up to a factor of 9 at 400 nm. We also observed that radiances measured at points over the sea are greater than those measured at the corresponding point over the land; we partially attributed this effect to the spatial variations in the albedo. Moreover, we found that the horizon obscuration leads to significant reductions in the radiance at points on the blocked horizon; these reductions range from 60% (at 400 nm) to 80% (at 300 nm). Methodological details are provided below.

Graphical abstract: Spectral UV radiance measured at a coastal site: a case study

Back to tab navigation

Publication details

The article was received on 22 Dec 2012, accepted on 22 Mar 2013 and first published on 25 Mar 2013

Article type: Paper
DOI: 10.1039/C3PP25440B
Citation: Photochem. Photobiol. Sci., 2013,12, 1193-1201

  •   Request permissions

    Spectral UV radiance measured at a coastal site: a case study

    R. R. Cordero, A. Damiani, L. Da Silva, D. Laroze and F. Labbe, Photochem. Photobiol. Sci., 2013, 12, 1193
    DOI: 10.1039/C3PP25440B

Search articles by author