Errors in UV reflectivity and albedo calculations due to neglecting polarization

Piet Stammes

doi:10.1117/12.198580

4 January 1995 Errors in UV reflectivity and albedo calculations due to neglecting polarization

Piet Stammes

Proceedings Volume 2311, Atmospheric Sensing and Modelling; (1995) https://doi.org/10.1117/12.198580
Event: Satellite Remote Sensing, 1994, Rome, Italy

Abstract

Ultraviolet (UV) spectrometer of the atmosphere is becoming increasingly important for the determination of ozone concentrations from space (cf., e.g., the new satellite instruments GOME on board ERS-2 and SCIAMACHY on board Envisat-1). By measuring the shape of the ozone Huggins bands, which are situated from about 310 to 340 nm, accurate ozone column and profile detection is possible in principle. In the retrieval procedure, based on radiative transfer calculations of atmospheric UV reflectivity, polarization is usually neglected. However, this may introduce an appreciable error, because in the UV molecular (Rayleigh) scattering, which can yield a high degree of polarization, is the dominant scattering process. In this study the magnitude and spectral dependency of the reflectivity error in the Huggins bands due to neglecting polarization has been investigated. The maximum relative error in the nadir reflectivity is of the order of 5%. Furthermore, the error shows the structure of the Huggins bands, amounting to about 1% in the relative reflectivity. This has implications for the retrieval of ozone column and profile. The UV albedo has been found to be in error by at most about 2% when polarization is neglected. This is contrary to the usual assumption that angularly integrated quantities are not influenced by neglection of polarization in molecular scattering atmospheres.

Citation Download Citation

Piet Stammes "Errors in UV reflectivity and albedo calculations due to neglecting polarization", Proc. SPIE 2311, Atmospheric Sensing and Modelling, (4 January 1995); https://doi.org/10.1117/12.198580

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