Comparisons between ground measurements of broadband ultraviolet irradiance (300 to 380 nm) and total ozone mapping spectrometer ultraviolet estimates at Moscow for 1979 to 2000

Nataly Ye. Chubarova; Alla Yu. Yurova; Nickolay A. Krotkov; Jay Herman; Pawan K. Bhartia

doi:10.1117/1.1516819

1 December 2002 Comparisons between ground measurements of broadband ultraviolet irradiance (300 to 380 nm) and total ozone mapping spectrometer ultraviolet estimates at Moscow for 1979 to 2000

Nataly Ye. Chubarova, Alla Yu. Yurova, Nickolay A. Krotkov, Jay Herman, Pawan K. Bhartia

Author Affiliations +

Optical Engineering, Vol. 41, Issue 12, (December 2002). https://doi.org/10.1117/1.1516819

We show the comparisons between ground-based measurements of spectrally integrated (300 to 380 nm) UV irradiance and satellite estimates from the total ozone mapping spectrometer (TOMS) total ozone and reflectivity data for the whole period of TOMS measurements (1979 to 2000) over the Meteorological Observatory of Moscow State University (MO MSU), Russia. Several aspects of the comparisons are analyzed, including effects of cloudiness, aerosol, and snow cover. Special emphasis is given to the effect of different spatial and temporal averaging of ground-based data when comparing low-resolution satellite measurements. The comparisons in cloud-free conditions with different aerosol loading have revealed positive TOMS bias with interannual variations within +5 to +20%. Reprocessing the TOMS data by accounting for boundary layer aerosol absorption (single scattering albedo ~0.9) removes the bias for all-sky conditions, except for completely overcast situations, where the TOMS bias remains large (15 to 17%). The single scattering albedo was independently verified using sun photometer (CIMEL Electronique) sun and sky-radiance measurements at MO MSU in September 2001. The analysis of interannual UV variations shows quite similar behavior for both TOMS and ground measurements (correlation coefficient r0.8). No long-term trend in the annual mean bias was found for all conditions. Both TOMS and ground data show positive trends in broadband UV irradiance (300 to 380 nm) between 1979 and 2000. The UV trend is attributed to decreases in both cloudiness and aerosol optical thickness during the late 1990s over the Moscow region. However, if the analyzed period is extended to include the preTOMS era (1968 to 2000 period), no trend in ground UV irradiance is detected.

©(2002) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Nataly Ye. Chubarova, Alla Yu. Yurova, Nickolay A. Krotkov, Jay Herman, and Pawan K. Bhartia "Comparisons between ground measurements of broadband ultraviolet irradiance (300 to 380 nm) and total ozone mapping spectrometer ultraviolet estimates at Moscow for 1979 to 2000," Optical Engineering 41(12), (1 December 2002). https://doi.org/10.1117/1.1516819

Published: 1 December 2002

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