World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Retrieval of Dust Aerosols During Night: Improved Assessment of Long Wave Dust Radiative Forcing Over Afro-asian Regions : Volume 28, Issue 8 (18/08/2010)

By Deepshikha, S.

Click here to view

Book Id: WPLBN0003983728
Format Type: PDF Article :
File Size: Pages 5
Reproduction Date: 2015

Title: Retrieval of Dust Aerosols During Night: Improved Assessment of Long Wave Dust Radiative Forcing Over Afro-asian Regions : Volume 28, Issue 8 (18/08/2010)  
Author: Deepshikha, S.
Volume: Vol. 28, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Srinivasan, J., & Deepshikha, S. (2010). Retrieval of Dust Aerosols During Night: Improved Assessment of Long Wave Dust Radiative Forcing Over Afro-asian Regions : Volume 28, Issue 8 (18/08/2010). Retrieved from

Description: Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore-560012, India. Several investigators in the past have used the radiance depression (with respect to clear-sky infrared radiance), resulting from the presence of mineral dust aerosols in the atmosphere, as an index of dust aerosol load in the atmosphere during local noon. Here, we have used a modified approach to retrieve dust index during night since assessment of diurnal average infrared dust forcing essentially requires information on dust aerosols during night. For this purpose, we used infrared radiance (10.5–12.5 μm), acquired from the METEOSAT-5 satellite (~ 5 km resolution). We found that the dust index algorithm, valid for daytime, will no longer hold during the night because dust is then hotter than the theoretical dust-free reference. Hence we followed a minimum reference approach instead of a conventional maximum reference approach. A detailed analysis suggests that the maximum dust load occurs during the daytime. Over the desert regions of India and Africa, maximum change in dust load is as much as a factor of four between day and night and factor of two variations are commonly observed. By realizing the consequent impact on long wave dust forcing, sensitivity studies were carried out, which indicate that utilizing day time data for estimating the diurnally averaged long-wave dust radiative forcing results in significant errors (as much as 50 to 70%). Annually and regionally averaged long wave dust radiative forcing (which account for the diurnal variation of dust) at the top of the atmosphere over Afro-Asian region is 2.6 ± 1.8 W m−2, which is 30 to 50% lower than those reported earlier. Our studies indicate that neglecting diurnal variation of dust while assessing its radiative impact leads to an overestimation of dust radiative forcing, which in turn result in underestimation of the radiative impact of anthropogenic aerosols.

Retrieval of dust aerosols during night: improved assessment of long wave dust radiative forcing over Afro-Asian regions

Chandra, S., Satheesh, S. K., and Srinivasan, J.: Can the state of mixing of black carbon aerosols explain the mystery of excess atmospheric absorption?, Geophys. Res. Lett., 31, L19109, doi:10.1029/2004GL020662, 2004.; Coackley, J. A. and Bretherton, F. P.: Cloud cover from high resolution scanner data: method and preliminary results, J. Geophys. Res., 87, 4917–4932, 1982.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Regional Distribution of Absorbing Efficiency of Dust Aerosols over India and Adjacent Continents inferred using Satellite Remote Sensing, Geophys. Res. Lett., 32(3), L03811, doi:10.1029/2004GL022091, 2005.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Dust aerosols over India and adjacent continents retrieved using METEOSAT infrared radiance Part I: sources and regional distribution, Ann. Geophys., 24, 37–61, doi:10.5194/angeo-24-37-2006, 2006a.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Dust aerosols over India and adjacent continents retrieved using METEOSAT infrared radiance Part II: quantification of wind dependence and estimation of radiative forcing, Ann. Geophys., 24, 63–79, doi:10.5194/angeo-24-63-2006, 2006b.; Haywood, J. and Boucher, O.: Estimates of the direct and indirect radiative forcing due to tropospheric aerosols: A review, Rev. Geophys., 38(4), 513–543, 2000.; Hess, M., Koepke, P., and Schult, I.: Optical properties of aerosols and clouds: The software package OPAC, B. Am. Meteorol. Soc., 79, 831–844, 1998.; Intergovernmental Panel on Climate Change (IPCC): Fourth Assessment Report, Cambridge University Press, 2007.; Kaufman, Y. J., Tanré, D., Gordon, H. R., et al.: Passive remote sensing of tropospheric aerosol and atmospheric correction for the aerosol effect, J. Geophys. Res., 102(D14), 16815–16830, 1997.; Legrand, M., Plana-Fattori, A., and N'doume, C.: Satellite detection of dust using the IR imagery of Meteosat 1. Infrared Difference Dust Index, J. Geophys. Res., 106(D16), 18251–18274, 2001.; Liao, H. and Seinfeld, J. H.: Radiative forcing by mineral dust aerosols: sensitivity to key variables, J. Geophys. Res., 103, 31637–31645, 1998.; Ricchiazzi, P., Yang, S., Gautier, C., and Sowle, D.: SBDART, A research and teaching tool for plane-parellel radiative transfer in the Earth's atmosphere, B. Am. Meteorol. Soc., 79, 2101–2114, 1998.; Seinfeld, J. H., Carmichael, G. R., Arimoto, R., et al.: Regional Climatic and Atmospheric Chemical Effects of Asian Dust and Pollution, B. Am. Meteorol. Soc., 367–380, 2004.; Sokolik, I. N., Toon, O. B., and Bergstrom, R. W.: Modeling the radiative characteristics of airborne mineral aerosols at infrared wavelengths, J. Geophys. Res., 103(D8), 8813–8826, 1998.; Tanré, D. and Legrand, M.: On the satellite retrieval of Saharan dust optical thickness over land: Two different approaches, J. Geophys. Res., 96, 5221–5227, 1991.; Tegen, I. and Lacis, A. A.: Modeling of particle size distribution and its influence on the radiative properties of mineral dust aerosol, J. Geophys. Res.-A., 101(D14), 19237–19244, 1996.; Tegen, I., Hollrig, P., Chin, M., et al.: Contribution of different aerosol species to the global aerosol extinction optical thickness: Estimates from model results, J. Geophys. Res.-A., 102(D20), 23895–23915, 1997.


Click To View

Additional Books

  • On the Origin of Falling-tone Chorus Ele... (by )
  • Statistics of Auroral Langmuir Waves : V... (by )
  • Gravity Wave Propagation in the Realisti... (by )
  • First Cluster Results of the Magnetic Fi... (by )
  • Seasonal Cycle of Cloud Cover Analyzed U... (by )
  • Solar and Auroral Evidence for an Intens... (by )
  • Influence of the Ionosphere on the Altit... (by )
  • Complexity in the Scaling of Velocity Fl... (by )
  • Outflowing Ionospheric Oxygen-ion Motion... (by )
  • Mesopause Dynamics from the Scandinavian... (by )
  • Integrated Water Vapor from Igs Ground-b... (by )
  • Results of the Rio De Janeiro Magnetic O... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from Sony eBook Library 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.