DOI: 10.1175/JCLI-D-12-00471.1
Scopus记录号: 2-s2.0-84880655306
论文题名: Impact of strong tropical volcanic eruptions on enso simulated in a coupled gcm
作者: Ohba M. ; Shiogama H. ; Yokohata T. ; Watanabe M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 14 起始页码: 5169
结束页码: 5182
语种: 英语
Scopus关键词: Coupled general circulation models
; Equatorial Pacific
; Maritime Continent
; Precipitation anomalies
; Sea surface temperature (SST)
; Short-wave radiation
; Volcanic eruptions
; Walker circulation
; Atmospheric pressure
; Atmospheric radiation
; Atmospheric temperature
; Experiments
; Thermostats
; Tropics
; Volcanoes
; El Nino
; El Nino-Southern Oscillation
; general circulation model
; La Nina
; precipitation (climatology)
; radiative forcing
; sea surface temperature
; shortwave radiation
; stratosphere
; volcanic aerosol
; volcanic eruption
; Walker circulation
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: The impact of strong tropical volcanic eruptions (SVEs) on the El Niño-Southern Oscillation (ENSO) and its phase dependency is investigated using a coupled general circulation model (CGCM). This paper investigates the response of ENSO to an idealized SVE forcing, producing a peak perturbation of global-mean surface shortwave radiation larger than26.5 W m22. Radiative forcing due to volcanic aerosols injected into the stratosphere induces tropical surface cooling around the volcanic forcing peak. Identical-twin forecast experiments of an ENSO-neutral year in response to an SVE forcing show an El Niño-like warming lagging one year behind the peak forcing. In addition to a reduced role of the mean subsurface water upwelling (known as the dynamical thermostat mechanism), the rapid land surface cooling around the Maritime Continent weakens the equatorial Walker circulation, contributing to the positive zonal gradient of sea surface temperature (SST) and precipitation anomalies over the equatorial Pacific. Since the warm and cold phases of ENSO exhibit significant asymmetry in their transition and duration, the impact of a SVE forcing on El Niño and La Niña is also investigated. In the warm phase of ENSO, the prediction skill of the SVE-forced experiments rapidly drops approximately six months after the volcanic peak. Since the SVE significantly facilitates the duration of El Niño, the following transition from warm to cold ENSO is disrupted. The impact of SVE forcing on La Niña is, however, relatively weak. These results imply that the intensity of a dynamical thermostat-like response to a SVE could be dependent on the phase of ENSO.©2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51768
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Central Research Institute of Electric Power Industry, Abiko, Japan; National Institute for Environmental Studies, Tsukuba, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
Recommended Citation:
Ohba M.,Shiogama H.,Yokohata T.,et al. Impact of strong tropical volcanic eruptions on enso simulated in a coupled gcm[J]. Journal of Climate,2013-01-01,26(14)