DOI: 10.1175/JCLI-D-12-00029.1
Scopus记录号: 2-s2.0-84871757059
论文题名: Interannual tropospheric aerosol variability in the late twentieth century and its impact on tropical atlantic and west african climate by direct and semidirect effects
作者: Mahajan S. ; Evans K.J. ; Truesdale J.E. ; Hack J.J. ; Lamarque J.-F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 23 起始页码: 8031
结束页码: 8056
语种: 英语
Scopus关键词: Aerosol models
; Carbonaceous aerosol
; Chemical compositions
; Climate variability
; Climate variation
; Community atmosphere model
; Coupled Model Intercomparison Project
; Data sets
; Diabatic heating
; Dust aerosols
; Free troposphere
; Gulf of Guinea
; High resolution
; Interannual
; Interannual time scale
; Interannual variability
; Intertropical convergence zone
; Marine stratocumulus clouds
; North Atlantic
; Ocean mixed layers
; Reanalysis
; Regional climate
; Sea surface temperature (SST)
; Slab ocean models
; Spring season
; Stratocumulus clouds
; Surface emissions
; Tropical atlantic
; Tropical variability
; Tropospheric aerosols
; Twentieth century
; Atmospheric temperature
; Climate models
; Climatology
; Clouds
; Greenhouse gases
; Offshore oil wells
; Regression analysis
; Sea ice
; Tropics
; Troposphere
; Aerosols
; aerosol composition
; annual variation
; climate modeling
; climate variation
; cloud cover
; diabatic process
; greenhouse gas
; marine atmosphere
; regional climate
; sea ice
; sea surface temperature
; stratocumulus
; troposphere
; twentieth century
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Gulf of Guinea
; West Africa
英文摘要: A new high-resolution global tropospheric aerosol dataset with monthly resolution is generated using version 4 of the Community Atmosphere Model (CAM4) coupled to a bulk aerosol model and forced with recent estimates of surface emissions for the period 1961-2000 to identify tropospheric aerosol-induced interannual climate variations. The surface emissions dataset is constructed from phase 5 of the Coupled Model Intercomparison Project (CMIP5) decadal-resolution surface emissions dataset to include reanalysis of tropospheric chemical composition [40-yr Reanalysis of Tropospheric Chemical Composition (RETRO)] wildfire monthly emissions data. A four-member ensemble run is conducted using the spectral configuration of CAM4, forced with the new tropospheric aerosol dataset and prescribed with observed sea surface temperature, sea ice, and greenhouse gases. CAM4 only simulates the direct and semidirect effects of aerosols on the climate. The simulations reveal that variations in tropospheric aerosol levels can induce significant regional climate variability on the interannual time scales. Regression analyses over tropical Atlantic and Africa suggest that increasing dust aerosols can cool the North African landmass and shift convection southward fromWest Africa into the Gulf of Guinea in the spring season. Further, it is found that carbonaceous aerosols emanating from the southwestern African savannas can significantly cool the region and increase the marine stratocumulus cloud cover over the southeast tropical Atlantic Ocean by aerosol-induced diabatic heating of the free troposphere above the low clouds. Experiments conducted with CAM4 coupled to a slab ocean model suggest that present-day aerosols can cool the tropical North Atlantic and shift the intertropical convergence zone southward and can reduce the ocean mixed layer temperature beneath the increasedmarine stratocumulus clouds in the southeastern tropicalAtlantic. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52125
Appears in Collections: 气候变化事实与影响
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作者单位: Oak Ridge National Laboratory, Oak Ridge, TN, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Mahajan S.,Evans K.J.,Truesdale J.E.,et al. Interannual tropospheric aerosol variability in the late twentieth century and its impact on tropical atlantic and west african climate by direct and semidirect effects[J]. Journal of Climate,2012-01-01,25(23)