NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Influence of Desert Dust Intrusions on Ground-based and Satellite Derived Ultraviolet Irradiance in Southeastern SpainThe desert dust aerosols strongly affect propagation of solar radiation through the atmosphere, reducing surface irradiance available for photochemistry and photosynthesis. This paper evaluates effects of desert dust on surface UV erythemal irradiance (UVER), as measured by a ground-based broadband UV radiometer and retrieved from the satellite Ozone Monitoring Instrument (OMI) at Granada (southern Spain) from January 2006 to December 2010. The dust effects are characterized by the transmittance ra tio of the measured UVER to the corresponding modeled clear sky value. The transmittance has an exponential dependency on aerosol optical depth (AOD), with minimum values of approximately 0.6 (attenuation of approximately 40%). The OMI UVER algorithm does not account for UV aerosol absorption, which results in overestimation of the ground-based UVER especially during dust episodes with a mean relative difference up to 40%. The application of aerosol absorption post-correction method reduces OMI bias up to approximately 13%. The results highlight great effect of desert dust on the surface UV irradiance in regions like southern Spain, where dust intrusions from Sahara region are very frequent.
Document ID
20130009059
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1029/2012JD018056
Authors
Krotkov, Nickolay A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Anton, Manuel (Extremadura Univ. Spain)
Valenzuela, Antonio (Granada Univ. Spain)
Roman, Roberto (Valladolid Univ. Spain)
Lyamani, Hassan (Granada Univ. Spain)
Arola, Antti (Finnish Meteorological Inst. Finland)
Olmo, Francisco J. (Granada Univ. Spain)
Alados-Arboledas (Granada Univ. Spain)
Date Acquired
August 27, 2013
Publication Date
October 9, 2012
Publication Information
Publication: Journal of Geophysical Research-Atmospheres
Volume: 117
Subject Category
Geophysics
Report/Patent Number
GSFC-E-DAA-TN6564
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available