DOI: 10.1175/JCLI-D-14-00661.1
Scopus记录号: 2-s2.0-84944080858
论文题名: The response of the Indian Ocean dipole asymmetry to anthropogenic aerosols and greenhouse gases
作者: Cowan T. ; Cai W. ; Ng B. ; England M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 7 起始页码: 2564
结束页码: 2583
语种: 英语
Scopus关键词: Aerosols
; Atmospheric temperature
; Atmospheric thermodynamics
; Climate models
; Greenhouse gases
; Higher order statistics
; Stream flow
; Surface waters
; Anthropogenic aerosols
; Atmosphere-ocean interactions
; Climate sensitivity
; Climate variability
; Coupled Model Intercomparison Project
; Indian ocean dipoles
; Sea surface temperature (SST)
; Tropical Indian ocean
; Oceanography
; aerosol
; air-sea interaction
; climate variation
; evaporation
; greenhouse gas
; Indian Ocean Dipole
; precipitation assessment
; sea surface temperature
; skewness
; thermocline
; zonal wind
; Indian Ocean
英文摘要: The tropical Indian Ocean has experienced a faster warming rate in the west than in the east over the twentieth century. The warming pattern resembles a positive Indian Ocean dipole (IOD) that is well captured by climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5), forced with the two main anthropogenic forcings, long-lived greenhouse gases (GHGs), and aerosols. However, much less is known about how GHGs and aerosols influence the IOD asymmetry, including the negative sea surface temperature (SST) skewness in the east IOD pole (IODE). Here, it is shown that the IODE SST negative skewness is more enhanced by aerosols than by GHGs using single-factor forcing experiments from 10 CMIP5 models. Aerosols induce a greater mean zonal thermocline gradient along the tropical Indian Ocean than that forced by GHGs, whereby the thermocline is deeper in the east relative to the west. This generates strong asymmetry in the SST response to thermocline anomalies between warm and cool IODE phases in the aerosol-only experiments, enhancing the negative IODE SST skewness. Other feedback processes involving zonal wind, precipitation, and evaporation cannot solely explain the enhanced SST skewness by aerosols. An interexperiment comparison in one model with strong skewness confirms that the mean zonal thermocline gradient across the Indian Ocean determines the magnitude of the SST-thermocline asymmetry, which in turn controls the SST skewness strength. The findings suggest that as aerosol emissions decline and GHGs increase, this will likely contribute to a future weakening of the IODE SST skewness. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50861
Appears in Collections: 气候变化事实与影响
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作者单位: CSIRO Marine and Atmospheric Research, Aspendale, VIC, Australia; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia
Recommended Citation:
Cowan T.,Cai W.,Ng B.,et al. The response of the Indian Ocean dipole asymmetry to anthropogenic aerosols and greenhouse gases[J]. Journal of Climate,2015-01-01,28(7)