TY - GEN
T1 - The Brahmaputra River Valley
T2 - Aerosol and Atmospheric Optics: Visibility and Air Pollution Specialty Conference 2012
AU - Chakrabarty, Rajan K.
AU - Garro, Mark A.
AU - Wilcox, Eric M.
AU - Moosmüller, Hans
PY - 2012
Y1 - 2012
N2 - BC mass concentrations observed in Guwahati (a major city in the BRV region of SE Asia) during winter-time were found to be higher than those measured in mega cities of India and China, and much higher than values observed in urban locations of Europe and USA. Median values of the diurnal cycle of the BC mass concentration over the study period in January February 2011 are in the range of 9-41 μgm-3, with some individual values as high as 50 μgm -3 during evening and early morning times. The high level of BC mass concentrations reduces the short wave radiation at the surface which translates to a clear-sky lower atmospheric heating of ∼2K/d. This large surface cooling accompanied with significant atmospheric heating could qualitatively explain the regional climate change in the BRV region. Such a situation could intensify low-level inversion, which slows down convection and in turn inhibits cloud formation. Additionally, indirect effects associated with BC aerosols such as the cloud 'burn off effect 8 could affect the normal precipitation pattern over this region.
AB - BC mass concentrations observed in Guwahati (a major city in the BRV region of SE Asia) during winter-time were found to be higher than those measured in mega cities of India and China, and much higher than values observed in urban locations of Europe and USA. Median values of the diurnal cycle of the BC mass concentration over the study period in January February 2011 are in the range of 9-41 μgm-3, with some individual values as high as 50 μgm -3 during evening and early morning times. The high level of BC mass concentrations reduces the short wave radiation at the surface which translates to a clear-sky lower atmospheric heating of ∼2K/d. This large surface cooling accompanied with significant atmospheric heating could qualitatively explain the regional climate change in the BRV region. Such a situation could intensify low-level inversion, which slows down convection and in turn inhibits cloud formation. Additionally, indirect effects associated with BC aerosols such as the cloud 'burn off effect 8 could affect the normal precipitation pattern over this region.
UR - https://www.scopus.com/pages/publications/84879771780
M3 - Conference contribution
AN - SCOPUS:84879771780
SN - 9781622768219
T3 - Air and Waste Management Association - Aerosol and Atmospheric Optics: Visibility and Air Pollution Specialty Conference 2012
SP - 215
EP - 217
BT - Air and Waste Management Association - Aerosol and Atmospheric Optics
Y2 - 25 September 2012 through 28 September 2012
ER -