DOI: 10.1007/s11069-019-03636-x
论文题名: Atmospheric aerosol optical depth and its variability over an urban location in Eastern India
作者: Mukherjee T. ; Vinoj V.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 102, 期: 2 起始页码: 591
结束页码: 605
语种: 英语
中文关键词: Aerosol optical depth
; Angstrom exponent
; Bhubaneswar
; Diurnal variability
; MERRA
; MODIS
英文关键词: aerosol property
; anthropogenic source
; diurnal variation
; long range transport
; MODIS
; optical property
; urban area
; Bhubaneswar
; India
; Odisha
英文摘要: Eastern India is characterized by high aerosol loading of primarily anthropogenic origin due to both local emissions and long-range transport and hence outflow of air mass from the Indo-Gangetic Plains. Using a year-long measurement of atmospheric aerosol optical properties over Bhubaneswar, one of the fastest growing tier-two cities in the Eastern India, we show that the aerosol optical depth (AOD) varied between 0.39 and 0.96 with high loading during February and low during July. The Angstrom exponent (AE) was found to be mostly higher than unity indicating large dominance of fine mode particles with a larger AE. Further analysis using spectral curvature of AOD and satellite-based estimates indicates that more than 80% of the time, fine mode aerosols dominate the region. It is observed that there is a large diurnal variability in AOD (AE) of the order of 15% (5%) indicating a large change in loading (spectral characteristics) over a short period of within a day. The aerosols types inferred from spectral curvature method match reasonably well with those from MERRA-2 chemical reanalysis. Further, it is found that satellite-derived AOD’s are low biased with respect to ground measurements and are unable to capture seasonality consistently. These findings show that additional research is required to assess the causes for such inconsistency especially during the monsoon period. © 2019, Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168645
Appears in Collections: 气候变化与战略
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作者单位: School of Earth Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, India
Recommended Citation:
Mukherjee T.,Vinoj V.. Atmospheric aerosol optical depth and its variability over an urban location in Eastern India[J]. Natural Hazards,2020-01-01,102(2)