World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Effect of Water Vapor on the Determination of Aerosol Direct Radiative Effect Based on the Aeronet Fluxes : Volume 14, Issue 12 (20/06/2014)

By Huttunen, J.

Click here to view

Book Id: WPLBN0003993922
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Effect of Water Vapor on the Determination of Aerosol Direct Radiative Effect Based on the Aeronet Fluxes : Volume 14, Issue 12 (20/06/2014)  
Author: Huttunen, J.
Volume: Vol. 14, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Lindfors, A. V., Mikkonen, S., Arola, A., Myhre, G., J. Lehtine, K. E., Mielonen, T.,...Tripathi, S. N. (2014). Effect of Water Vapor on the Determination of Aerosol Direct Radiative Effect Based on the Aeronet Fluxes : Volume 14, Issue 12 (20/06/2014). Retrieved from

Description: Finnish Meteorological Institute, Kuopio, Finland. The aerosol direct radiative effect (ADRE) is defined as the change in the solar radiation flux, F, due to aerosol scattering and absorption. The difficulty in determining ADRE stems mainly from the need to estimate F without aerosols, F0, with either radiative transfer modeling and knowledge of the atmospheric state, or regression analysis of radiation data down to zero aerosol optical depth (AOD), if only F and AOD are observed. This paper examines the regression analysis method by using modeled surface data products provided by the Aerosol Robotic Network (AERONET). We extrapolated F0 by two functions: a straight linear line and an exponential nonlinear decay. The exponential decay regression is expected to give a better estimation of ADRE with a few percent larger extrapolated F0 than the linear regression. We found that, contrary to the expectation, in most cases the linear regression gives better results than the nonlinear. In such cases the extrapolated F0 represents an unrealistically low water vapor column (WVC), resulting in underestimation of attenuation caused by the water vapor, and hence too large F0 and overestimation of the magnitude of ADRE. The nonlinear ADRE is generally 40–50% larger in magnitude than the linear ADRE due to the extrapolated F0 difference. Since for a majority of locations, AOD and WVC have a positive correlation, the extrapolated F0 with the nonlinear regression fit represents an unrealistically low WVC, and hence too large F0. The systematic underestimation of F0 with the linear regression is compensated by the positive correlation between AOD and water vapor, providing the better result.

Effect of water vapor on the determination of aerosol direct radiative effect based on the AERONET fluxes

Bokoye, A. I., Royer, A., Cliche, P., and O'Neill, N.: Calibration of Sun Radiometer – based atmospheric water vapor retrievals using GPS meteorology, J. Atmos. Ocean. Tech., 24, 964–979, doi:10.1175/JTECH2011.1, 2007.; Bush, B. C. and Valero, F. P. J.: Spectral aerosol radiative forcing at the surface during the Indian Ocean Experiment (INDOEX), J. Geophys. Res., 107, 8003, doi:10.1029/2000JD000020, 2002.; Bush, B. C. and Valero, F. P. J.: Surface aerosol radiative forcing at Gosan during the ACE-Asia campaign, J. Geophys. Res., 108, 8660, doi:10.1029/2002JD003233, 2003.; Conant, W. C., Seinfeld, J. H., Wang, J., Carmichael, G. R., Tang, Y., Uno, I., Flatau, P. J., Markowicz, K. M., and Quinn, P. K.: A model for the radiative forcing during ACE-Asia derived from CIRPAS Twin Otter and R/V Ronald H. Brown data and comparison with observations, J. Geophys. Res., 108, 8661, doi:10.1029/2002JD003260, 2003.; Derimian, Y., Léon, J.-F., Dubovik, O., Chiapello, I., Tanré, D., Sinyuk, A., Auriol, F., Podvin, T., Brogniez, G., and Holben, B. N.: Radiative properties of aerosol mixture observed during the dry season 2006 over M'Bour, Senegal (African Monsoon Multidisciplinary Analysis campaign), J. Geophys. Res., 113, D00C09, doi:10.1029/2008JD009904, 2008.; Di Sarra, A., Pace, G., Meloni, D., De Silvestri, L., Piacentino, S., and Monteleone, F.: Surface shortwave radiative forcing of different aerosol types in the central Mediterranean, Geophys. Res. Lett., 35, L02714, doi:10.1029/2007GL032395, 2008.; Dubovik, O. and King, M. D.: A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements, J. Geophys. Res., 105, 20673–20696, doi:10.1029/2000JD900282, 2000.; Dubovik, O., Smirnov, A., Holben, B. N., King, M. D., Kaufman, Y. J., Eck, T. F., and Slutsker, I.: Accuracy assessments of aerosol optical properties retrieved from Aerosol Robotic Network (AERONET) Sun and sky radiance measurements, J. Geophys. Res., 105, 9791–9806, doi:10.1029/2000JD900040, 2000.; Dumka, U. C., Satheesh, S. K., Pant, P., Hegde, P., and Krishna Moorthy, K.: Surface changes in solar irradiance due to aerosols over central Himalayas, Geophys. Res. Lett., 33, L20809, doi:10.1029/2006GL027814, 2006.; Eck, T. F., Holben, B. N., Reid, J. S., Dubovik, O., Smirnov, A., O'Neill, N. T., Slutsker, I., and Kinne, S.: Wavelength dependence of the optical depth of biomass burning, urban, and desert dust aerosols, J. Geophys. Res., 104, 31333–31349, doi:10.1029/1999JD900923, 1999.; García, O. E., Díaz, A. M., Expósito, F. J., Díaz, J. P., Dubovik, O., Dubuisson, P., Roger, J.-C., Eck, T. F., Sinuyk, A., Derimian, Y., Dutton, E. G., Schafer, J. S., Holben, B. N., and García, C. A.: Validation of AERONET estimates of atmospheric solar surface fluxes and aerosol radiative forcing by ground-based broadband measurements, J. Geophys. Res., 113, D21207, doi:10.1029/2008JD010211, 2008.; García, O. E., Díaz, A. M., Expósito, F. J., Díaz, J. P., Redondas, A., and Sasaki, T.: Aerosol radiative forcing and forcing efficiency in the UVB for regions affected by Saharan and Asian Mineral Dust, J. Atmos. Sci., 66, 1033–1040, doi:10.1175/2008JAS2816.1, 2009.; García, O. E., Díaz, J. P., Expósito, F. J


Click To View

Additional Books

  • Cloud Droplet Activation and Surface Ten... (by )
  • Reassessment of Mipas Age of Air Trends ... (by )
  • Technical Note: Evaluation of Standard U... (by )
  • An Assessment of Caliop Polar Stratosphe... (by )
  • New Trajectory Driven Aerosol and Chemic... (by )
  • Variability of Cirrus Clouds in a Convec... (by )
  • Do Biomass Burning Aerosols Intensify Dr... (by )
  • Mean Winds in the Mlt, the Sqbo and Msao... (by )
  • Size-resolved Cloud Condensation Nuclei ... (by )
  • Tight Coupling of Particle Size and Comp... (by )
  • Tes Ammonia Retrieval Strategy and Globa... (by )
  • Long-lived Halocarbon Trends and Budgets... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Fair are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.