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Accumulation of Aerosols Over the Indo-gangetic Plains and Southern Slopes of the Himalayas: Distribution, Properties and Radiative Effects During the 2009 Pre-monsoon Season : Volume 11, Issue 5 (23/05/2011)

By Gautam, R.

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Book Id: WPLBN0003976822
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Accumulation of Aerosols Over the Indo-gangetic Plains and Southern Slopes of the Himalayas: Distribution, Properties and Radiative Effects During the 2009 Pre-monsoon Season : Volume 11, Issue 5 (23/05/2011)  
Author: Gautam, R.
Volume: Vol. 11, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hsu, N. C., Tsay, S. C., Lau, K. M., Kim, K. M., Payra, S., Aryal, D.,...Bell, S. (2011). Accumulation of Aerosols Over the Indo-gangetic Plains and Southern Slopes of the Himalayas: Distribution, Properties and Radiative Effects During the 2009 Pre-monsoon Season : Volume 11, Issue 5 (23/05/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Universities Space Research Association, Columbia, MD 21044, USA. We examine the distribution of aerosols and associated optical/radiative properties in the Gangetic-Himalayan region from simultaneous radiometric measurements over the Indo-Gangetic Plains (IGP) and the foothill/slopes of the Himalayas during the 2009 pre-monsoon season. Enhanced dust transport extending from the Southwest Asian arid regions into the IGP, results in seasonal mean (April–June) aerosol optical depths of over 0.6 – highest over southern Asia. The influence of dust loading is greater over the western IGP as suggested by pronounced coarse mode peak in aerosol size distribution and spectral single scattering albedo (SSA). The transported dust in the IGP, driven by prevailing westerly airmass, is found to be more absorbing (SSA550 nm ~0.89) than the near-desert region in NW India (SSA550 nm ~0.91) suggesting mixing with carbonaceous aerosols in the IGP. On the contrary, significantly reduced dust transport is observed over eastern IGP and foothill/elevated slopes in Nepal where strongly absorbing haze is prevalent, associated with upslope transport of pollution, as indicated by low values of SSA (0.85–0.9 for the wavelength range of 440–1020 nm), suggesting presence of more absorbing aerosols compared to IGP. Assessment of the radiative impact of aerosols over NW India suggests diurnal mean reduction in solar radiation fluxes of 19–23 Wm−2 at surface (12–15 % of the surface solar insolation). Based on limited observations of aerosol optical properties during the pre-monsoon period and comparison of our radiative forcing estimates with published literature, there exists spatial heterogeneity in the regional aerosol forcing, associated with the absorbing aerosol distribution over northern India, with both diurnal mean surface forcing and forcing efficiency over the IGP exceeding that over NW India. Additionally, the role of the seasonal progressive buildup of aerosol loading and water vapor is investigated in the observed net aerosol forcing over NW India. The radiative impact of water vapor is found to amplify the net regional aerosol radiative forcing suggesting that the two exert forcing in tandem leading to enhanced surface cooling. It is suggested that water vapor contribution should be taken into account while assessing aerosol forcing impact for this region and other seasonally similar environments.

Summary
Accumulation of aerosols over the Indo-Gangetic plains and southern slopes of the Himalayas: distribution, properties and radiative effects during the 2009 pre-monsoon Season

Excerpt
Beegum, S. N., Moorthy, K. K., Nair, V. S., Babu, S. S., Satheesh, S. K., Vinoj, V., Reddy, R. R., Gopal, K. R., Badarinath, K. V. S., Niranjan, K., Pandey, S. K., Behera, M., Jeyaram, A., Bhuyan, P. K., Gogoi, M. M., Singh, S., Pant, P., Dumka, U. C., Kant, Y., Kuniyal, J. C., and Singh, D.: Characteristics of Spectral Aerosol Optical Depths over India during ICARB, J. Earth Syst. Sci., 117, 303–313, 2008.; Bollasina, M., Nigam, S., and Lau, K.-M.: Absorbing aerosols and summer monsoon evolution over South Asia: An observational portrayal, J. Clim., 21, 3221–3239, 2008.; Bonasoni, P., Laj, P., Marinoni, A., Sprenger, M., Angelini, F., Arduini, J., Bonaf�, U., Calzolari, F., Colombo, T., Decesari, S., Di Biagio, C., di Sarra, A. G., Evangelisti, F., Duchi, R., Facchini, MC., Fuzzi, S., Gobbi, G. P., Maione, M., Panday, A., Roccato, F., Sellegri, K., Venzac, H., Verza, GP., Villani, P., Vuillermoz, E., and Cristofanelli, P.: Atmospheric Brown Clouds in the Himalayas: first two years of continuous observations at the Nepal Climate Observatory-Pyramid (5079 m), Atmos. Chem. Phys., 10, 7515–7531, doi:10.5194/acp-10-7515-2010, 2010.; Conant, W. C.: An observational approach for determining aerosol surface radiative forcing: Results from the first field phase of INDOEX, J. Geophys. Res., 105, 15347–15360, doi:10.1029/1999JD901166, 2000.; Collier, J. C. and Zhang, G. J.: Aerosol direct forcing of the summer Indian monsoon as simulated by the NCAR CAM3, Clim. Dyn., 32, 313–332, 2009.; Carrico, C. M., Bergin, M. H., Shrestha, A. B., Dibb, J. E., Gomes, L., and Harris J. M.: The importance of carbon and mineral dust to seasonal aerosol properties in the Nepal Himalaya, Atmos. Environ., 37, 2811–2824, 2003.; Deepshikha, S., Satheesh, S. K., and Srinivasan, J.: Dust Aerosols over India and Adjacent Continents Retrieved using METEOSAT Infrared Radiance: Part-I. Sources, Regional Distribution and Radiative Effects, Ann. Geophys., 24, 37–61, 2006.; Dey, S., Tripathi, S. N., Singh, R. P., and Holben, B. N.: Influence of dust storms on the aerosol optical properties over the Indo-Gangetic basin, J. Geophys. Res., 109, D20211, doi:10.1029/2004JD004924, 2004.; Dey, S. and Tripathi, S. N.: Aerosol direct radiative effects over Kanpur in the Indo-Gangetic basin, northern India: Long-term (2001–2005) observations and implications to regional climate, J. Geophys. Res., 113, D04212, doi:10.1029/2007JD009029, 2008.; Dubovik, O., Sinyuk, A., Lapyonok, T., Holben, B. N., Mishchenko,M., Yang, P., Eck, T. F., Volten, H., Munoz, O., Veihelmann, B., van der Zande, W. J., Leon, J.-F., Sorokin, M., and Slutsker, I.: The application of spheroid models to account for aerosol particle non-sphericity in remote sensing of desert dust, J. Geophys. Res., 111, D11208, doi:10.1029/2005JD006619, 2006.; Dumka, U. C., Moorthy, K. K., Kumar, R., Hegde, P., Sagar, R., Pant, P., Singh, N., and Babu, S. S.: Characteristics of aerosol black carbon mass concentration over a high altitude location in the Central Himalayas from multi-year measurements, Atmos. Res., 96, 510–521, doi:10.1016/j.atmosres.2009.12.010, 2010.; 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.; Fu, Q. and Liou, K. N.: Parameterization of the radiative properties of cirrus clouds, J. Atmos. Sci., 50, 2008–2025, 1993.; Menon, S., Hansen

 

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