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ENSO response to external forcing in CMIP5 simulations of the last millennium

le, Vinh Thanh LU (2017) In Global and Planetary Change 148. p.105-112
Abstract

The El Niño–Southern Oscillation (ENSO) is dominant mode of interannual climate variability, but its response to external climate forcings remains uncertain. Past studies have limitations including the use of short datasets and the uncertainty contained in reconstructions or simulations of past ENSO variations. To improve our understanding on ENSO variations, it is important to examine its response to these forcings by using multi model simulations since they provide longer datasets and help improving the statistical significance of the results. In this study, Granger causality test is applied to investigate the influence of external forcings on ENSO by using past millennium simulations (period 850–1850 CE) of Coupled Model... (More)

The El Niño–Southern Oscillation (ENSO) is dominant mode of interannual climate variability, but its response to external climate forcings remains uncertain. Past studies have limitations including the use of short datasets and the uncertainty contained in reconstructions or simulations of past ENSO variations. To improve our understanding on ENSO variations, it is important to examine its response to these forcings by using multi model simulations since they provide longer datasets and help improving the statistical significance of the results. In this study, Granger causality test is applied to investigate the influence of external forcings on ENSO by using past millennium simulations (period 850–1850 CE) of Coupled Model Intercomparison Project Phase 5 (CMIP5) models. The results show robust influence of volcanic forcing to ENSO during preindustrial times of last millennium. The response of ENSO to solar forcing is more likely to be weak. Detection of GHGs variations signal in ENSO response is not significant. However, this study also indicates that there are uncertainties in the responses of ENSO to solar forcing and GHGs radiative forcing. The possibility of the true causal connection between Total Solar Irradiance (TSI) or GHGs radiative forcing and ENSO cannot be rejected at 95% significance level.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ENSO, Granger causality, Greenhouse gases radiative forcing, Last millennium, Solar forcing, Volcanic forcing
in
Global and Planetary Change
volume
148
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85007605034
  • wos:000393528200010
ISSN
0921-8181
DOI
10.1016/j.gloplacha.2016.12.002
language
English
LU publication?
yes
id
3cf80881-923e-4d24-85c2-1c75a44ba6ad
date added to LUP
2017-03-16 12:17:20
date last changed
2018-01-07 11:56:04
@article{3cf80881-923e-4d24-85c2-1c75a44ba6ad,
  abstract     = {<p>The El Niño–Southern Oscillation (ENSO) is dominant mode of interannual climate variability, but its response to external climate forcings remains uncertain. Past studies have limitations including the use of short datasets and the uncertainty contained in reconstructions or simulations of past ENSO variations. To improve our understanding on ENSO variations, it is important to examine its response to these forcings by using multi model simulations since they provide longer datasets and help improving the statistical significance of the results. In this study, Granger causality test is applied to investigate the influence of external forcings on ENSO by using past millennium simulations (period 850–1850 CE) of Coupled Model Intercomparison Project Phase 5 (CMIP5) models. The results show robust influence of volcanic forcing to ENSO during preindustrial times of last millennium. The response of ENSO to solar forcing is more likely to be weak. Detection of GHGs variations signal in ENSO response is not significant. However, this study also indicates that there are uncertainties in the responses of ENSO to solar forcing and GHGs radiative forcing. The possibility of the true causal connection between Total Solar Irradiance (TSI) or GHGs radiative forcing and ENSO cannot be rejected at 95% significance level.</p>},
  author       = {le, Vinh Thanh},
  issn         = {0921-8181},
  keyword      = {ENSO,Granger causality,Greenhouse gases radiative forcing,Last millennium,Solar forcing,Volcanic forcing},
  language     = {eng},
  month        = {01},
  pages        = {105--112},
  publisher    = {Elsevier},
  series       = {Global and Planetary Change},
  title        = {ENSO response to external forcing in CMIP5 simulations of the last millennium},
  url          = {http://dx.doi.org/10.1016/j.gloplacha.2016.12.002},
  volume       = {148},
  year         = {2017},
}