World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Sensitivity of Boreal-summer Circulation and Precipitation to Atmospheric Aerosols in Selected Regions – Part 1: Africa and India : Volume 27, Issue 10 (23/10/2009)

By Sud, Y. C.

Click here to view

Book Id: WPLBN0003980831
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Sensitivity of Boreal-summer Circulation and Precipitation to Atmospheric Aerosols in Selected Regions – Part 1: Africa and India : Volume 27, Issue 10 (23/10/2009)  
Author: Sud, Y. C.
Volume: Vol. 27, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Nenes, A., Walker, G. K., Lau, W. K., Wilcox, E., Zhou, Y., Sud, Y. C.,...Kim, K. (2009). Sensitivity of Boreal-summer Circulation and Precipitation to Atmospheric Aerosols in Selected Regions – Part 1: Africa and India : Volume 27, Issue 10 (23/10/2009). Retrieved from

Description: Laboratory for Atmospheres, NASA/Goddard Space Flight Center, Greenbelt, MD, USA. Version-4 of the Goddard Earth Observing System (GEOS-4) General Circulation Model (GCM) was employed to assess the influence of potential changes in aerosols on the regional circulation, ambient temperatures, and precipitation in four selected regions: India and Africa (current paper), as well as North and South America (companion paper). Ensemble-simulations were carried out with the GCM to assess the aerosol direct and indirect effects, hereafter ADE and AIE. Each simulation was started from the NCEP-analyzed initial conditions for 1 May and was integrated through May-June-July-August of each year: 1982–1987 to provide an ensemble set of six simulations. In the first set, called experiment (#1), climatological aerosols were prescribed. The next two experiments (#2 and #3) had two sets of simulations each: one with 2X and other with 1/2X the climatological aerosols over each of the four selected regions. In experiment #2, the anomaly regions were advectively restricted (AR), i.e., the large-scale prognostic fields outside the aerosol anomaly regions were prescribed while in experiment #3, the anomaly regions were advectively Interactive (AI) as is the case in a normal GCM integrations, but with the same aerosols anomalies as in experiment #2. Intercomparisons of circulation, diabatic heating, and precipitation difference fields showed large disparities among the AR and AI simulations, which raised serious questions about the proverbial AR assumption, commonly invoked in regional climate simulation studies. Consequently AI simulation mode was chosen for the subsequent studies. Two more experiments (#4 and #5) were performed in the AI mode in which ADE and AIE were activated one at a time. The results showed that ADE and AIE work in concert to make the joint influences larger than sum of each acting alone. Moreover, the ADE and AIE influences were vastly different for the Indian and Africa regions, which suggest an imperative need to include them rationally in climate models. We also found that the aerosol induced increase of tropical cirrus clouds would potentially offset any cirrus thinning that may occur due to warming in response to CO2 increase.

Sensitivity of boreal-summer circulation and precipitation to atmospheric aerosols in selected regions – Part 1: Africa and India

Ackerman, A. S., van Zanten, M. C., Stevens, B., Savic-Jovcic, V., Bretherton, C. S., Chlond, A., Gloaz, J.-G., Jiang, H., Khairoutdinov, M., Krueger, S. K., Lewellen, D. C. Lock, A., Moeng, C.-H., Nakamura, K., Petters, M. D., Snider, J. R., Weinbrecht, S., and Zulauf, M.: Large-eddy simulations of a drizzling, stratocumulus-topped marine boundary layer, Mon. Weather Rev., 137, 3, doi:10.1175/2008MWR2582.1, 2009.; Albrecht, B. A.: Aerosols, Cloud Microphysics, and Fractional Cloudiness, Science, 245(1989), 1227–1230, 1989.; Andreae, M. O., Jones, C. D., and Cox, P. M.: Strong present-day aerosol cooling implies a hot future, Nature, 435(3671), 1187–1190, 2005.; Ångström, A.: On the Atmospheric Transmission of Sun Radiation and on Dust in the Air, Geografiska Annaler, 11, 156–166, 1929.; Bell, T. L., Rosenfeld, D., Kim, K.-M, Yoo, J.-M., Lee, M.-I., and Hahnenberger, M.: Midweek increase in U.S. summer rain and storm heights suggests air pollution invigorates rainstorms, J. Geophys. Res., 113, D02209, doi:10.1029/2007JD008623, 2008.; Bony, S., Coleman, R., and Kattsov, V. M.: How well do we understand and evaluate climate change feedback processes. A Review Paper, J. Climate, 19, 3455–3482, 2006.; Bollasina, M., Nigam, S., and Lau, K.-M.: Absorbing aerosols and summer monsoon evolution over south Asia: an observational portrayal, J. Climate, 21, 3221–3229, 2008.; Brierley, C. M., Fedorov, A. V., Liu, Z., Herbert, T. D., Lawrence, K. T., and LaRiviere, J. P.: Greatly Expanded Tropical Warm Pool and Weakened Hadley Circulation in the Early Pliocene (27 March 2009), Science, 323(5922), 1714, doi:10.1126/science.1167625, 2009.; Chand, D., Wood, R., Anderson, T. L., Satheesh, S. K., and Charlson, R. J.: Satellite-derived direct radiative effect of aerosols dependent on cloud cover, Nature Geosci., 2, 181–184, 2009.; Gradel, T. E. and Crutzen, P. J.: Atmospheric Change: an Earth System Perspective, W. H. Freeman & Co., New York, 1993.; Charlson, R. J., Schwartz, S. E., Hales, J. M., Cess, R. D., Coakley Jr., J. A., Hansen, J.E., and Hoffman, D. J.: Climate Forcing by Anthropogenic Aerosols, Science, 255, 423–430, 1992.; Chin, M., Ginuox, P., Kinne, S., Torres, O., Holben, B. N., Duncan, B. N., Martin, R. V., Logan, J. A., Higurashi, A., and Nakijima, T.: Tropospheric Aerosol Optical Thickness from the GOCART Model and Comparisons with Satellite and Sun Photometer Measurements, J. Atmos. Sci., 59, 461–483, 2002.; Chin, M., Chu, D. A., Levy, R., Remer, L., Kaufman, Y., Holben, B. N., Eck, T., Ginoux, P., and Gao, Q.: Aerosol distribution in the Northern Hemisphere during ACE-Asia: Results from global model, satellite observations, and Sun photometer measurements, J. Geophys. Res., 109(D23), S90, doi:10.1029/2004JD004829, 2004.; Chou, M.-D. and Suarez, M. J.: An efficient thermal infrared radiation parameterization for use in general circulation models, NASA Tech. Memo., 104606, vol. 3, 85 pp., NTIS N95-15745, 1994.; Chou, M. D. and Suarez, M. J.: A Solar Radiation Parameterization for Atmospheric Studies, NASA Tech. Memo., 104606, vol. 15, 38 pp, 1999.; Chou, M. D., Suarez, M. J., Ho, C. H., Yan, M. H., and Lee, K. T.: Parameterizations for cloud overlapping and shortwave single scattering properties for use in general circulation and cloud ensemble models, J. Climate, 11, 202–214, 1998.; Chylek, P., Dubey, M. K., Lohmann, U., Ramanathan, V., Kaufman, Y., Lesins, G., Hudson, J., Altmann, G., and Olsen, S.: Aerosol indirect effect over the Indian Ocean, Geophys. Res. Lett., 33, L06806, doi:10.1029/2005GL025397, 2006.; Del Genio, A. D., Yao, M.-S., and Jonas, J.: Will moist convection be stronger in a warmer climate?, Geophys. Res. Lett., 34, L16703, doi:10.1029/2007GL030525, 2007.; Easter, R. C., Ghan, S. J., Zhang, Y., et al.: MIRAGE: Model description and evaluation of aerosols and trace gases, J. Geophys. Res.-Atmos., 109, D20210, doi:10.1029/2004JD004571, 2004.; Fountoukis, C. and Nenes, A.: Continued development of a cloud


Click To View

Additional Books

  • Payload Charging Events in the Mesospher... (by )
  • Identifying Power Line Harmonic Radiatio... (by )
  • Mapping Ionospheric Backscatter Measured... (by )
  • Cluster Peace Observations of Electrons ... (by )
  • Mesoscale Ionospheric Electrodynamics of... (by )
  • Identification of Magnetosheath Mirror M... (by )
  • Release of 222Rn from Some Soils : Volum... (by )
  • A One-way Nested Eddy Resolving Model of... (by )
  • Improving and Testing the Empirical Equa... (by )
  • Initial Daytime and Nighttime Sofdi Obse... (by )
  • Ionospheric Long-term Trends: Can the Ge... (by )
Scroll Left
Scroll Right


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