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Modeling the Influences of Aerosols on Pre-monsoon Circulation and Rainfall Over Southeast Asia : Volume 13, Issue 12 (16/12/2013)

By Lee, D.

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Book Id: WPLBN0003996598
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Modeling the Influences of Aerosols on Pre-monsoon Circulation and Rainfall Over Southeast Asia : Volume 13, Issue 12 (16/12/2013)  
Author: Lee, D.
Volume: Vol. 13, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kim, K., Oreopoulos, L., Sud, Y. C., Lee, D., Lau, W. K., & Kang, I. (2013). Modeling the Influences of Aerosols on Pre-monsoon Circulation and Rainfall Over Southeast Asia : Volume 13, Issue 12 (16/12/2013). Retrieved from http://worldlibrary.net/


Description
Description: GESTAR, Morgan State University, Baltimore, Maryland, USA. We conduct several sets of simulations with a version of the GEOS-5 Atmospheric Global Climate Model (AGCM) equipped with a two-moment cloud microphysical scheme to understand the role of biomass burning (BB) aerosol emissions in Southeast (SE) Asia in the pre-monsoon period February–May. Our experiments are designed so that both direct and indirect aerosol effects can be evaluated. For climatologically prescribed monthly sea surface temperatures, we conduct sets of model integrations with and without biomass burning emissions in the area of peak burning activity, and with direct aerosol radiative effects either active or deactivated. Taking appropriate differences between AGCM experiment sets we find that BB aerosols affect liquid clouds in statistically significantly ways, increasing cloud droplet number concentrations, decreasing droplet effective radii (i.e., a classic aerosol indirect effect), and locally suppressing precipitation due to a decelerate of the autoconversion process, with the latter effect apparently also leading to cloud condensate increases. Geographical re-arrangements of precipitation patterns, with precipitation increases downwind of aerosol sources are also seen, most likely because of advection of weakly precipitating cloud fields. Somewhat unexpectedly, the change in cloud radiative effects (cloud forcing) is in the direction of less cooling because of decreases in cloud fraction. Overall, however, because of direct radiative effect contributions, aerosols exert a negative forcing at both the top of the atmosphere and, perhaps most importantly, the surface, where decreased evaporation triggers feedbacks that further reduce precipitation. Invoking the approximation that direct and indirect aerosol effects are additive, we estimate that the overall precipitation reduction is about 40% due to the direct effects of absorbing aerosols which stabilize the atmosphere and reduce surface latent heat fluxes via cooler land surface temperatures. Further refinements of our two-moment cloud microphysics scheme are needed for a more complete examination of the role of aerosol-convection interactions in the seasonal development of the SE Asia monsoon.

Summary
Modeling the influences of aerosols on pre-monsoon circulation and rainfall over Southeast Asia

Excerpt
Albrecht, B.: Aerosols, cloud microphysics, and fractional cloudiness, Science, 245, 1227–1230, doi:10.1126/science.245.4923.1227, 1989.; Barahona, D. and Nenes, A.: Parameterizing the competition between homogeneous and heterogeneous freezing in cirrus cloud formation – monodisperse ice nuclei, Atmos. Chem. Phys., 9, 369–381, doi:10.5194/acp-9-369-2009, 2009a.; Barahona, D. and Nenes, A.: Parameterizing the competition between homogeneous and heterogeneous freezing in ice cloud formation – polydisperse ice nuclei, Atmos. Chem. Phys., 9, 5933–5948, doi:10.5194/acp-9-5933-2009, 2009b.; Chin, M., Ginoux, P., Kinne, S., Torres, O., Holben, B., Duncan, B., Martin, R., Logan, J., Higurashi, A., and Nakajima, T.: Tropospheric aerosol optical thickness from the GOCART model and comparisons with satellite and Sun photometer measurements, J. Atmos. Sci., 59, 461–483, 2.0.CO;2>doi:10.1175/1520-0469(2002)059<0461:TAOTFT>2.0.CO;2, 2002.; Chu, D., Kaufman, Y., Ichoku, C., Remer, L., Tanre, D., and Holben, B.: Validation of MODIS aerosol optical depth retrieval over land, Geophys. Res. Lett., 29, doi:10.1029/2001GL013205, 2002.; Clough, S., Shephard, M., Mlawer, E., Delamere, J., Iacono, M., Cady-Pereira, K., Boukabara, S., and Brown, P.: Atmospheric radiative transfer modeling: a summary of the AER codes, J. Quant. Spectrosc. Ra., 91, 233–244, doi:10.1016/j.jqsrt.2004.05.058, 2005.; Colarco, P., da Silva, A., Chin, M., and Diehl, T.: Online simulations of global aerosol distributions in the NASA GEOS-4 model and comparisons to satellite and ground-based aerosol optical depth, J. Geophys. Res.-Atmos., 115, D14207, doi:10.1029/2009JD012820, 2010.; Darmenov, A. and da Silva, A.: The Quick Fire Emissions Dataset (QFED) – Documentation of Versions 2.1, 2.2 and 2.4., NASA Technical Report Series on Global Modeling and Data Assimilation. NASA TM-2013-104606, vol. 32, 183 pp., 2013.; Gautam, R., Hsu, N., Eck, T., Holben, B., Janjai, S., Jantarach, T., Tsay, S., and Lau, W.: Characterization of aerosols over the Indochina peninsula from satellite-surface observations during biomass burning pre-monsoon season, Atmos. Environ., 78, 51–59, doi:10.1016/j.atmosenv.2012.05.038, 2013.; Huffman, G., Adler, R., Morrissey, M., Bolvin, D., Curtis, S., Joyce, R., McGavock, B., and Susskind, J.: Global precipitation at one-degree daily resolution from multisatellite observations, J. Hydrometeorol., 2, 36–50, 2.0.CO;2>doi:10.1175/1525-7541(2001)002<0036:GPAODD>2.0.CO;2, 2001.; IPCC: Climate Change, The Physical Science Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panelon Climate Change, edited by: Solomon, S. et al., Cambridge Univ. Press, USA, 2007.; Kim, D. and Kang, I.-S.: A bulk mass flux convection scheme for climate model: description and moisture sensitivity, Clim. Dynam., 38, 411–429, doi:10.1007/s00382-010-0972-2, 2012.; Kim, M.-K., Lau, K.-M., Kim, K.-M., and Lee, W.: A GCM study of effects of radiative forcing of sulfate aerosol on large scale circulation and rainfall in East Asia during boreal spring, Geophys. Res. Lett., 34, L24701, doi:10.1029/2007GL031683, 2007.; Lau, K.-M. and Kim, K.-M.: Observational relationships betwe

 

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