Journal article
Impact of Southeast Asian smoke on aerosol properties in Southwest China: First comparison of model simulations with satellite and ground observations
Journal of geophysical research. Atmospheres, Vol.122(7), pp.3904-3919
04/16/2017
DOI: 10.1002/2016JD025793
Abstract
Smoke aerosols have been observed in Southwest China as a result of long‐range transport from surrounding areas in March and April. The processes driving this transport and the resultant impact on regional aerosol optical properties are studied here through a combined use of the Goddard Earth Observing System (GEOS)‐Chem chemistry transport model in conjunction with satellite and the first‐ever ground‐based observations in the Southwest China. The potential biomass burning source regions as well as their respective contributions to aerosol loading in Southwest China are quantified. Compared to Sun photometer observations of aerosol optical depth (AOD) at 550 nm at eight stations in the study region (10–28°N, 90–115°E, comprising Northeast India, Indo‐China Peninsula, and Southwest and South China), the AOD simulated by GEOS‐Chem (nested grid with 0.5° × 0.667° resolution) by using the Fire Inventory from National Center for Atmospheric Research shows an average bias of −0.17 during January 2012 to May 2013. However, during the biomass burning months (March–April), the simulated AOD is much improved with a bias of −0.04. Model sensitivity experiments show that biomass burning in Burma and Northeast India is the largest contributor to smoke AOD (~88%) and total AOD (~57%) over Kunming, an urban site in Southwest China. Case studies on 21–23 March 2013 show that the smoke layer in Northeast India and North Burma can extend from the surface to 4 km and then be transported to Southwest China by prevailing westerly airflow. Model‐simulated AOD and vertical distribution of aerosols are respectively in good agreement with satellite measurements from Moderate Resolution Imaging Spectroradiometer and Cloud‐Aerosol Lidar with Orthogonal Polarization.
Key Points
GESO‐Chem model with nested grid capability and FINN emission shows smoke transport from Southeast Asia to Southwest China
Simulated AOD temporal variability agrees with that from the limited but first‐ever ground observations in the region
Northeast India and Burma are the largest contributor to smoke aerosol in Southwest China
Details
- Title: Subtitle
- Impact of Southeast Asian smoke on aerosol properties in Southwest China: First comparison of model simulations with satellite and ground observations
- Creators
- Jun Zhu - University of Chinese Academy of SciencesXiangao Xia - University of Chinese Academy of SciencesJun Wang - University of IowaJinqiang Zhang - University of Chinese Academy of SciencesChristine Wiedinmyer - National Center for Atmospheric ResearchJenny A Fisher - University of WollongongChristoph A Keller - Harvard University
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Atmospheres, Vol.122(7), pp.3904-3919
- DOI
- 10.1002/2016JD025793
- ISSN
- 2169-897X
- eISSN
- 2169-8996
- Number of pages
- 16
- Grant note
- Chinese Academy of Sciences (XDA05100301) Australian government National Science Foundation of China (41475138) Nanjing University of Information Science and Technology
- Language
- English
- Date published
- 04/16/2017
- Academic Unit
- Electrical and Computer Engineering; Civil and Environmental Engineering; Physics and Astronomy; Chemical and Biochemical Engineering
- Record Identifier
- 9984104911602771
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