Evidence of Atmospheric Brown Clouds Over India During the 2009 Drought Year

Using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite derived vertical pro- files (Total Attenuated Backscatter at 532 nm, Depolarization Ratios at 532 nm, Vertical Feature Mask, monthly mean vertical aerosol and extinction variability), monthly precipitation anomalies from National Centers for Environmental Prediction-Climate Prediction Center (NCEP-CPC) and NCEP wind anomalies; we report the presence of Atmospheric Brown Clouds (ABCs) over India (65°E-95°E; 8°N-35°N) during the summer monsoon of 2009. CALIPSO data revealed the persistent presence of a massive aerosol plume till 4 Km above sea level; this plume persisted for over 7 months (March through September 2009) over India and was loaded with anthropogenic aerosols like sulphates, black carbon products from biomass burning and fossil fuel combustion. The CALIPSO vertical profiles, NCEP-CPC monthly precipitation anomalies and NCEP monthly wind anomalies corroborate the presence of aerosol plume.

[1]  D. Winker,et al.  Initial performance assessment of CALIOP , 2007 .

[2]  David M. Winker,et al.  Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar , 2010 .

[3]  Rosenfeld,et al.  Suppression of rain and snow by urban and industrial air pollution , 2000, Science.

[4]  Zhaoyan Liu,et al.  Two contrasting dust‐dominant periods over India observed from MODIS and CALIPSO data , 2009 .

[5]  J. Jimenez,et al.  Absorption Angstrom Exponent in AERONET and related data as an indicator of aerosol composition , 2009 .

[6]  M. V. Ramana,et al.  Warming trends in Asia amplified by brown cloud solar absorption , 2007, Nature.

[7]  P. Webster,et al.  Monsoons: Processes, predictability, and the prospects for prediction , 1998 .

[8]  P. N. Vinayachandran,et al.  Extremes of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean oscillation , 2004 .

[9]  David M. Winker,et al.  Summer dust aerosols detected from CALIPSO over the Tibetan Plateau , 2007 .

[10]  J. Kiehl,et al.  Atmospheric brown clouds: impacts on South Asian climate and hydrological cycle. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[11]  Qun Xu,et al.  Abrupt change of the mid-summer climate in central east China by the influence of atmospheric pollution , 2001 .

[12]  P. Devara,et al.  Study of successive contrasting monsoons (2001–2002) in terms of aerosol variability over a tropical station Pune, India , 2009 .

[13]  Martin Wild,et al.  Inaugural Article by a Recently Elected Academy Member , 2003 .

[14]  S. Gadgil,et al.  The aberrant behaviour of the Indian monsoon in June 2009 , 2009 .

[15]  Dave Winker,et al.  The CALIPSO mission and initial results from CALIOP , 2006, SPIE Asia-Pacific Remote Sensing.

[16]  Zhaoyan Liu,et al.  Airborne dust distributions over the Tibetan Plateau and surrounding areas derived from the first year of CALIPSO lidar observations , 2008 .

[17]  M. Andreae,et al.  Smoking Rain Clouds over the Amazon , 2004, Science.

[18]  B. Hoskins,et al.  Relations between interannual and intraseasonal monsoon variability as diagnosed from AMIP integrations , 1997 .

[19]  Patrick Minnis,et al.  Long-range transport and vertical structure of Asian dust from CALIPSO and surface measurements during PACDEX , 2008 .

[20]  V. Ramaswamy,et al.  Linear additivity of climate response for combined albedo and greenhouse perturbations , 1997 .

[21]  Vinay Kumar,et al.  The Indian summer monsoon drought of 2002 and its linkage with tropical convective activity over northwest Pacific , 2007 .