DOI: 10.1002/2013JD020507
论文题名: Trends in aerosol optical depth over Indian region: Potential causes and impact indicators
作者: Babu S.S. ; Manoj M.R. ; Moorthy K.K. ; Gogoi M.M. ; Nair V.S. ; Kompalli S.K. ; Satheesh S.K. ; Niranjan K. ; Ramagopal K. ; Bhuyan P.K. ; Singh D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11794
结束页码: 11806
语种: 英语
英文关键词: anthropogenic impact
; atmospheric aerosol
; size distribution
Scopus关键词: Atmospheric radiation
; Atmospheric thermodynamics
; Dust
; Loading
; Rain
; Size distribution
; Space research
; Aerosol optical depths
; Aerosol radiative forcing
; Anthropogenic activity
; Anthropogenic components
; Anthropogenic impacts
; Indian space research organizations
; Indian subcontinents
; Seasonal variability
; Atmospheric aerosols
; aerosol property
; atmospheric modeling
; dust
; human activity
; monsoon
; optical depth
; radiative forcing
; seasonal variation
; size distribution
; spectral analysis
; trend analysis
; turbidity
; India
英文摘要: The first regional synthesis of long-term (back to ~ 25 years at some stations) primary data (from direct measurement) on aerosol optical depth from the ARFINET (network of aerosol observatories established under the Aerosol Radiative Forcing over India (ARFI) project of Indian Space Research Organization over Indian subcontinent) have revealed a statistically significant increasing trend with a significant seasonal variability. Examining the current values of turbidity coefficients with those reported ~ 50 years ago reveals the phenomenal nature of the increase in aerosol loading. Seasonally, the rate of increase is consistently high during the dry months (December to March) over the entire region whereas the trends are rather inconsistent and weak during the premonsoon (April to May) and summer monsoon period (June to September). The trends in the spectral variation of aerosol optical depth (AOD) reveal the significance of anthropogenic activities on the increasing trend in AOD. Examining these with climate variables such as seasonal and regional rainfall, it is seen that the dry season depicts a decreasing trend in the total number of rainy days over the Indian region. The insignificant trend in AOD observed over the Indo-Gangetic Plain, a regional hot spot of aerosols, during the premonsoon and summer monsoon season is mainly attributed to the competing effects of dust transport and wet removal of aerosols by the monsoon rain. Contributions of different aerosol chemical species to the total dust, simulated using Goddard Chemistry Aerosol Radiation and Transport model over the ARFINET stations, showed an increasing trend for all the anthropogenic components and a decreasing trend for dust, consistent with the inference deduced from trend in Angstrom exponent. Key Points First-ever synthesis of long-term primary data on spectral AOD over India Statistically significant increasing trend in AOD with seasonal variability Spectral variation of AOD reveals the significance of anthropogenic activities ©2013. 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/63225
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, Thiruvananthapuram 695 022, Kerala, India; Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, India; Department of Physics, Andhra University, Visakhapatanam, India; Department of Physics, Sri Krishnadevaraya University, Anantapur, India; Department of Physics, Dibrugarh University, Dibrugarh, India; Department of Physics, Punjabi University, Patiala, India
Recommended Citation:
Babu S.S.,Manoj M.R.,Moorthy K.K.,et al. Trends in aerosol optical depth over Indian region: Potential causes and impact indicators[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)