DOI: 10.1002/jgrd.50428
论文题名: Volcanic sulfate deposition to Greenland and Antarctica: A modeling sensitivity study
作者: Toohey M. ; Krüger K. ; Timmreck C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4788
结束页码: 4800
语种: 英语
英文关键词: aerosol transport
; ice cores
; sulfate aerosol
; sulfate deposition
; volcanic eruptions
Scopus关键词: Aerosols
; Atmospheric movements
; Efficiency
; Glaciers
; Ice
; Sulfur
; Sulfur dioxide
; Volcanoes
; Aerosol transport
; Ice core
; Sulfate aerosols
; Sulfate deposition
; Volcanic eruptions
; Sedimentation
; aerosol
; ice core
; ice sheet
; particle size
; sedimentation
; stratosphere
; sulfate
; volcanic eruption
; winter
; Antarctica
; Arctic
; Greenland
; Pinatubo
英文摘要: Reconstructions of the atmospheric sulfate aerosol burdens resulting from past volcanic eruptions are based on ice core-derived estimates of volcanic sulfate deposition and the assumption that the two quantities are directly proportional. We test this assumption within simulations of tropical volcanic stratospheric sulfur injections with the MAECHAM5-HAM aerosol-climate model. An ensemble of 70 simulations is analyzed, with SO2 injections ranging from 8.5 to 700 Tg, with eruptions in January and July. Modeled sulfate deposition flux to Antarctica shows excellent spatial correlation with ice core-derived estimates for Pinatubo and Tambora, although the comparison suggests the modeled flux to the ice sheets is 4-5 times too large. We find that Greenland and Antarctic deposition efficiencies (the ratio of sulfate flux to each ice sheet to the maximum hemispheric stratospheric sulfate aerosol burden) vary as a function of the magnitude and season of stratospheric sulfur injection. Changes in simulated sulfate deposition for large SO2 injections are connected to increases in aerosol particle size, which impact aerosol sedimentation velocity and radiative properties, the latter leading to strong dynamical changes including strengthening of the winter polar vortices, which inhibits the transport of stratospheric aerosols to high latitudes. The resulting relationship between Antarctic and Greenland volcanic sulfate deposition is nonlinear for very large eruptions, with significantly less sulfate deposition to Antarctica than to Greenland. These model results suggest that variability of deposition efficiency may be an important consideration in the interpretation of ice core sulfate signals for eruptions of Tambora-magnitude and larger. Key PointsModeled deposition of volcanic sulfate varies with eruption magnitude and seasonAntarctic sulfate deposition efficiency decreases for strong eruptionsAnomalous post-eruption dynamics impacts transport from stratosphere to surface ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63742
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: GEOMAR Helmholtz-Centre for Ocean Research Kiel, Kiel, Germany; Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
Toohey M.,Krüger K.,Timmreck C.. Volcanic sulfate deposition to Greenland and Antarctica: A modeling sensitivity study[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)