DOI: 10.1002/2016JD025592
论文题名: Radiative effects of absorbing aerosols over northeastern India: Observations and model simulations
作者: Gogoi M.M. ; Babu S.S. ; Moorthy K.K. ; Bhuyan P.K. ; Pathak B. ; Subba T. ; Chutia L. ; Kundu S.S. ; Bharali C. ; Borgohain A. ; Guha A. ; De B.K. ; Singh B. ; Chin M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 2 起始页码: 1132
结束页码: 1157
语种: 英语
英文关键词: biomass-burning fraction
; black carbon
; GOCART
; radiative forcing
; spectral absorption
; WRF-Chem
Scopus关键词: absorption coefficient
; aerosol
; atmospheric modeling
; biomass burning
; black carbon
; concentration (composition)
; fossil fuel
; MODIS
; observational method
; optical depth
; particulate organic matter
; radiative forcing
; weather forecasting
; Gangetic Plain
; India
英文摘要: Multiyear measurements of spectral properties of aerosol absorption are examined over four geographically distinct locations of northeastern India. Results indicated significant spatiotemporal variation in aerosol absorption coefficients (σabs) with highest values in winter and lowest in monsoon. The western parts of the region, close to the outflow of Indo-Gangetic Plains, showed higher values of σabs and black carbon (BC) concentration—mostly associated with fossil fuel combustion. But, the eastern parts showed higher contributions from biomass-burning aerosols, as much as 20–25% to the total aerosol absorption, conspicuously during premonsoon season. This is attributed to a large number of burning activities over the Southeast Asian region, as depicted from Moderate Resolution Imaging Spectroradiometer fire count maps, whose spatial extent and magnitude peaks during March/April. The nearly consistent high values of aerosol index (AI) and layer height from Ozone Monitoring Instrument indicate the presence of absorbing aerosols in the upper atmosphere. The observed seasonality has been captured fairly well by Goddard Chemistry Aerosol Radiation and Transport (GOCART) as well as Weather Research and Forecasting–Chemistry (WRF-Chem) model simulations. The ratio of column-integrated optical depths due to particulate organic matter and BC from GOCART showed good coincidence with satellite-based observations, indicating the increased vertical dispersion of absorbing aerosols, probably by the additional local convection due to higher fire radiative power caused by the intense biomass-burning activities. In the WRF-Chem though underperformed by different magnitude in winter, the values are closer or overestimated near the burnt areas. Atmospheric forcing due to BC was highest (~30 Wm−2) over the western part associated with the fossil fuel combustion. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62739
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India; CAOS, Indian Institute of Science, Bangalore, India; Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh, India; North Eastern Space Application Centre, Shillong, India; Department of Physics, Tripura University, Agartala, India; Department of Physics, Manipur University, Imphal, India; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Gogoi M.M.,Babu S.S.,Moorthy K.K.,et al. Radiative effects of absorbing aerosols over northeastern India: Observations and model simulations[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)