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Title: Increased absorption by coarse aerosol particles over the Gangetic–Himalayan region

Each atmospheric aerosol type has distinctive light-absorption characteristics related to its physical/chemical properties. Climate models treat black carbon as the main light-absorbing component of carbonaceous atmospheric aerosols, while absorption by some organic aerosols is also considered, particularly at ultraviolet wavelengths. Most absorbing aerosols are assumed to be < 1 μm in diameter (sub-micron). Here we present results from a recent field study in India, primarily during the post-monsoon season (October–November), suggesting the presence of absorbing aerosols sized 1–10 μm. Absorption due to super-micron-sized particles was nearly 30% greater than that due to smaller particles. Periods of increased absorption by larger particles ranged from a week to a month. Radiative forcing calculations under clear-sky conditions show that super-micron particles account for nearly 44% of the total aerosol forcing. The origin of the large aerosols is unknown, but meteorological conditions indicate that they are of local origin. Such economic and habitation conditions exist throughout much of the developing world. Furthermore, large absorbing particles could be an important component of the regional-scale atmospheric energy balance.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 14; Journal Issue: 3; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1396303

Manoharan, Vani Starry, Kotamarthi, R., Feng, Yan, and Cadeddu, Maria P.. Increased absorption by coarse aerosol particles over the Gangetic–Himalayan region. United States: N. p., Web. doi:10.5194/acp-14-1159-2014.
Manoharan, Vani Starry, Kotamarthi, R., Feng, Yan, & Cadeddu, Maria P.. Increased absorption by coarse aerosol particles over the Gangetic–Himalayan region. United States. doi:10.5194/acp-14-1159-2014.
Manoharan, Vani Starry, Kotamarthi, R., Feng, Yan, and Cadeddu, Maria P.. 2014. "Increased absorption by coarse aerosol particles over the Gangetic–Himalayan region". United States. doi:10.5194/acp-14-1159-2014. https://www.osti.gov/servlets/purl/1396303.
@article{osti_1396303,
title = {Increased absorption by coarse aerosol particles over the Gangetic–Himalayan region},
author = {Manoharan, Vani Starry and Kotamarthi, R. and Feng, Yan and Cadeddu, Maria P.},
abstractNote = {Each atmospheric aerosol type has distinctive light-absorption characteristics related to its physical/chemical properties. Climate models treat black carbon as the main light-absorbing component of carbonaceous atmospheric aerosols, while absorption by some organic aerosols is also considered, particularly at ultraviolet wavelengths. Most absorbing aerosols are assumed to be < 1 μm in diameter (sub-micron). Here we present results from a recent field study in India, primarily during the post-monsoon season (October–November), suggesting the presence of absorbing aerosols sized 1–10 μm. Absorption due to super-micron-sized particles was nearly 30% greater than that due to smaller particles. Periods of increased absorption by larger particles ranged from a week to a month. Radiative forcing calculations under clear-sky conditions show that super-micron particles account for nearly 44% of the total aerosol forcing. The origin of the large aerosols is unknown, but meteorological conditions indicate that they are of local origin. Such economic and habitation conditions exist throughout much of the developing world. Furthermore, large absorbing particles could be an important component of the regional-scale atmospheric energy balance.},
doi = {10.5194/acp-14-1159-2014},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 3,
volume = 14,
place = {United States},
year = {2014},
month = {2}
}