DOI: 10.1016/j.atmosres.2018.04.021
Scopus记录号: 2-s2.0-85048820651
论文题名: The influence of volcanic eruptions on weather regimes over the North Atlantic simulated by ECHAM5/MPI-OM ensemble runs from 800 to 2000 CE
作者: Guðlaugsdóttir H. ; Steen-Larsen H.C. ; Sjolte J. ; Masson-Delmotte V. ; Werner M. ; Sveinbjörnsdóttir Á.E.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 213 起始页码: 211
结束页码: 223
语种: 英语
Scopus关键词: Atmospheric pressure
; Earth (planet)
; Oceanography
; Sea ice
; Vortex flow
; Atmospheric circulation
; Atmospheric response
; Decadal timescale
; Dynamic interaction
; Future climate projections
; North Atlantic oscillations
; Northern hemisphere
; Volcanic eruptions
; Volcanoes
; annual variation
; atmospheric circulation
; decadal variation
; ensemble forecasting
; ice cover
; North Atlantic Oscillation
; Northern Hemisphere
; polar vortex
; regional climate
; temperature
; volcanic eruption
; wind field
; Atlantic Ocean
; Atlantic Ocean (North)
; Scandinavia
英文摘要: The volcanic fingerprint on the winter North Atlantic atmospheric circulation and climate is analyzed in six ensemble runs of ECHAM5/MPI-OM covering 800–2000 CE, both for equatorial and Northern Hemisphere (NH) eruptions. Large volcanic eruptions influence climate on both annual and decadal time scales due to dynamic interactions of different climate components in the Earth's system. It is well known that the North Atlantic Oscillation (NAO) tends to shift towards its positive phase during winter in the first 1–2 years after large tropical volcanic eruptions, causing warming over Europe, but other North Atlantic weather regimes have received less attention. Here we investigate the four dominant weather regimes in the North Atlantic: The negative and positive phase of NAO as well as the Atlantic Ridge, Scandinavian blocking. The volcanic fingerprint is detected as a change in the frequency of occurrence and anomalies in the wind and temperature fields as well as in the sea ice cover. We observe a strong significant increase in the frequency of Atlantic Ridge in the second year after equatorial eruptions that precede the NAO+ detected in year 3–5 as a result of a strong zonal wind anomalies in year 1–2. Evidence for a stronger polar vortex is detected in years 12–14 where NAO+ is detected both as a frequency increase and in the wind and temperature fields. A short-term response is also detected 2–4 years after NH eruptions. The longterm signal after NH eruptions indicate a weak polar vortex around a decade after an eruption. Although the signal after NH eruptions is weaker our results stress the need for further studies. The simulated atmospheric response recorded in ECHAM5 after volcanic eruptions suggest a more dynamic response than previously thought. The methodology used can also be applied to other forcing scenario, for example for future climate projections where the aim is to search for a long-term climate signal. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108779
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Institute of Earth Sciences, University of Iceland, Iceland; Nordic Volcanological Centre (NordVulk), Institute of Earth Sciences, University of Iceland, Iceland; Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway; Department of Geology, Lund University, Sweden; LSCE (UMR 8212 CEA-CNRS-UVSQ), Université Paris Saclay, Institut Pierre Simon Laplace, France; Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Guðlaugsdóttir H.,Steen-Larsen H.C.,Sjolte J.,et al. The influence of volcanic eruptions on weather regimes over the North Atlantic simulated by ECHAM5/MPI-OM ensemble runs from 800 to 2000 CE[J]. Atmospheric Research,2018-01-01,213