DOI: 10.1016/j.gloplacha.2013.02.007
论文题名: Absorbing aerosol variability over the Indian subcontinent and its increasing dependence on ENSO
作者: Abish B. ; Mohanakumar K.
刊名: Global and Planetary Change
ISSN: 0921-8290
出版年: 2013
卷: 106 起始页码: 13
结束页码: 19
语种: 英语
英文关键词: Aerosol index
; Oceanic Niño index
; Zonal circulation
Scopus关键词: Aerosol concentration
; Aerosol index
; El Nino southern oscillation
; Indian subcontinents
; Interannual variability
; Sea surface temperature anomalies
; Statistical correlation
; Tropical Pacific ocean
; Aerosols
; Air
; Atmospheric temperature
; Climate change
; Loading
; Subsidence
; Atmospheric movements
; absorption
; aerosol composition
; aerosol property
; annual variation
; concentration (composition)
; El Nino-Southern Oscillation
; marine atmosphere
; sea surface temperature
; Arabian Peninsula
; India
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: In this study, the influence of the El Nino Southern Oscillation (ENSO) on the transport, deposition and distribution of absorbing aerosols over the Indian subcontinent during a period of 30. years (1982 to 2011) is investigated. The analysis reveals that the changes in the zonal circulation over the tropics have a significant effect on the aerosol loading over the Indian region. This interannual variability in aerosol concentration arises due to its increasing dependence on the development of sea surface temperature (SST) anomalies over the tropical Pacific Ocean. Significant statistical correlations in SST anomalies confirm this relationship. During El Nino conditions, warm SST anomalies cause the zonal circulation to become pronounced with well-defined areas of rising and sinking motion along a mean air flow driven by convection at the west (the Arabian Peninsula), and subsidence to the east (Indian subcontinent). These intense westerlies at 700. hPa altitude transport large quantities of aerosols from the Arabian Peninsula towards the east and deposit them over the Indian subcontinent. However, a weaker and less organised zonal circulation system associated with cold SST anomalies suppresses the aerosol loading during the La Nina phase. •During El Nino the zonal circulation over the Indian subcontinent gains strength.•Mean air flow at 700hPa gets intensified from Arabian Peninsula towards India.•Strong upper level subsidence converges these aerosols over the Indian region.•Warm SST anomalies at Nino 3.4 region influence this zonal circulation.•Zonal circulation gets suppressed during La Nina decreasing aerosol concentration. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84875603801&doi=10.1016%2fj.gloplacha.2013.02.007&partnerID=40&md5=37b8ce83810db3b26251d35f5e24cbb0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11196
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Atmospheric Sciences, Cochin University of Science and Technology, Cochin - 682016, India
Recommended Citation:
Abish B.,Mohanakumar K.. Absorbing aerosol variability over the Indian subcontinent and its increasing dependence on ENSO[J]. Global and Planetary Change,2013-01-01,106.