Seasonal variation of UV radiation in the ocean under clear and cloudy conditions

Ziauddin Ahmad; Jay R. Herman; Alexander P. Vasilkov; Maria Tzortziou; B. Gregory Mitchell; Mati Kahru

doi:10.1117/12.505298

4 November 2003 Seasonal variation of UV radiation in the ocean under clear and cloudy conditions

Ziauddin Ahmad, Jay R. Herman, Alexander P. Vasilkov, Maria Tzortziou, B. Gregory Mitchell, Mati Kahru

Proceedings Volume 5156, Ultraviolet Ground- and Space-based Measurements, Models, and Effects III; (2003) https://doi.org/10.1117/12.505298
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Seasonal variability of solar UV radiation in ocean waters is estimated on a global scale by combining satellite measurements of scene reflectivity (TOMS), column ozone (TOMS) and chlorophyll concentration (SeaWiFS) with radiative transfer calculations for an ocean-atmosphere system. The new features are an extension of underwater radiative transfer (scattering and absorption) into the UV, inclusion of polarization in the above water diffuse radiances, the proper treatment of Fresnel reflection, and first order atmospheric backscatter of water-leaving radiance to the oceans. Maps of downwelling diffuse irradiances (E_d) at ocean surface and at different depths in the ocean, diffuse attenuation coefficient (K_d), and ten percent penetration depth (Z₁₀) of solar irradiation are computed for open ocean waters. Results on spectral irradiances at 310 nm in UV-B and at 380 nm in UV-A part of the spectrum are presented with particular emphasis on the role of aerosols, clouds, and ozone in the atmosphere and chlorophyll concentrations in the ocean.

Citation Download Citation

Ziauddin Ahmad, Jay R. Herman, Alexander P. Vasilkov, Maria Tzortziou, B. Gregory Mitchell, and Mati Kahru "Seasonal variation of UV radiation in the ocean under clear and cloudy conditions", Proc. SPIE 5156, Ultraviolet Ground- and Space-based Measurements, Models, and Effects III, (4 November 2003); https://doi.org/10.1117/12.505298

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available