DOI: 10.1016/j.atmosres.2017.09.018
Scopus记录号: 2-s2.0-85033576152
论文题名: Most probable mixing state of aerosols in Delhi NCR, northern India
作者: Srivastava P. ; Dey S. ; Srivastava A.K. ; Singh S. ; Tiwari S.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 200 起始页码: 88
结束页码: 96
语种: 英语
Scopus关键词: Aerosols
; Atmospheric radiation
; Atmospheric thermodynamics
; Carbon
; Climate change
; Climate models
; Coatings
; Dust
; Uncertainty analysis
; Aerosol chemical composition
; Aerosol composition
; Aerosol direct radiative forcing
; Aerosol mixing
; External mixing
; Limited information
; Satellite retrieval
; Sources of uncertainty
; Mixing
; aerosol
; chemical composition
; climate change
; dust
; estimation method
; monsoon
; radiative forcing
; winter
; Delhi
; India
英文摘要: Unknown mixing state is one of the major sources of uncertainty in estimating aerosol direct radiative forcing (DRF). Aerosol DRF in India is usually reported for external mixing and any deviation from this would lead to high bias and error. Limited information on aerosol composition hinders in resolving this issue in India. Here we use two years of aerosol chemical composition data measured at megacity Delhi to examine the most probable aerosol mixing state by comparing the simulated clear-sky downward surface flux with the measured flux. We consider external, internal, and four combinations of core-shell (black carbon, BC over dust; water-soluble, WS over dust; WS over water-insoluble, WINS and BC over WINS) mixing. Our analysis reveals that choice of external mixing (usually considered in satellite retrievals and climate models) seems reasonable in Delhi only in the pre-monsoon (Mar-Jun) season. During the winter (Dec-Feb) and monsoon (Jul-Sep) seasons, ‘WS coating over dust’ externally mixed with BC and WINS appears to be the most probable mixing state; while ‘WS coating over WINS’ externally mixed with BC and dust seems to be the most probable mixing state in the post-monsoon (Oct–Nov) season. Mean seasonal TOA (surface) aerosol DRF for the most probable mixing states are 4.4 ± 3.9 (− 25.9 ± 3.9), − 16.3 ± 5.7 (− 42.4 ± 10.5), 13.6 ± 11.4 (− 76.6 ± 16.6) and − 5.4 ± 7.7 (− 80.0 ± 7.2) W m− 2 respectively in the pre-monsoon, monsoon, post-monsoon and winter seasons. Our results highlight the importance of realistic mixing state treatment in estimating aerosol DRF to aid in policy making to combat climate change. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109009
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India; Indian Institute of Tropical Meteorology (Delhi Branch), Prof. Ramnath Vij Marg, New Delhi, 110060, India; Radio & Atmospheric Sciences Division, National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India
Recommended Citation:
Srivastava P.,Dey S.,Srivastava A.K.,et al. Most probable mixing state of aerosols in Delhi NCR, northern India[J]. Atmospheric Research,2018-01-01,200