DOI: 10.1175/2011JCLI4067.1
Scopus记录号: 2-s2.0-84859945126
论文题名: Mechanisms linking volcanic aerosols to the Atlantic meridional overturning circulation
作者: Iwi A.M. ; Hermanson L. ; Haines K. ; Sutton R.T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 8 起始页码: 3039
结束页码: 3051
语种: 英语
Scopus关键词: Arctic
; Hydrologic cycles
; Meridional overturning circulations
; Radiative forcings
; Salinity
; Sea surface temperature (SST)
; Aerosols
; Atmospheric radiation
; Atmospheric temperature
; Climate change
; Flow of water
; Volcanoes
; Atmospheric aerosols
; aerosol composition
; atmospheric convection
; atmospheric transport
; hydrological cycle
; Intergovernmental Panel on Climate Change
; meridional circulation
; overturn
; radiative forcing
; salinity
; sea surface temperature
; surface temperature
; volcanic aerosol
; volcanic eruption
; Arctic Ocean
; Central Luzon
; Greenland Sea
; Iceland
; Krakatau
; Luzon
; Mount Pinatubo
; Norwegian Sea
; Philippines
; Zambales
; Pinatubo
英文摘要: This study examines the sensitivity of the climate system to volcanic aerosol forcing in the third climate configuration of the Met Office Unified Model (HadCM3). The main test case was based on the 1880s when there were several volcanic eruptions, the well-known Krakatau being the largest. These eruptions increased atmospheric aerosol concentrations and induced a period of global cooling surface temperatures. In this study, an ensemble of HadCM3 has been integrated with the standard set of radiative forcings and aerosols from the Intergovernmental Panel on Climate Change Fourth Assessment Report simulations, from 1860 to present. A second ensemble removes the volcanic aerosols from 1880 to 1899. The all-forcings ensemble shows an attributable 1.2-Sv (1 Sv = 10 6 -3 s -1) increase in the Atlantic meridional overturning circulation (AMOC) at 45°N-with a 0.04-PW increase in meridional heat transport at 40°N and increased northern Atlantic SSTs-starting around 1894, approximately 11 years after the first eruption, and lasting a further 10 years at least. The mechanisms responsible are traced to the Arctic, with suppression of the global water cycle (high-latitude precipitation), which leads to an increase in upper-level Arctic and Greenland Sea salinities. This then leads to increased convection in the Greenland-Iceland-Norwegian (GIN) Seas, enhanced Denmark Strait overflows, and AMOC changes with density anomalies traceable southward along the western Atlantic boundary. The authors investigate whether a similar response to the Pinatubo eruption in 1991 could still be ongoing, but do not find strong evidence. © 2012 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52480
Appears in Collections: 气候变化事实与影响
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作者单位: BADC, NCAS, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom; NCAS-Climate, Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Earth Observation, University of Reading, Reading, United Kingdom; NCAS-Climate, Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Iwi A.M.,Hermanson L.,Haines K.,et al. Mechanisms linking volcanic aerosols to the Atlantic meridional overturning circulation[J]. Journal of Climate,2012-01-01,25(8)