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| Titel |
Stability of ENSO and its tropical Pacific teleconnections over the Last Millennium |
| VerfasserIn |
S. C. Lewis, A. N. LeGrande |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 10 ; Nr. 11, no. 10 (2015-10-13), S.1347-1360 |
| Datensatznummer |
250117435
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| Publikation (Nr.) |
 copernicus.org/cp-11-1347-2015.pdf |
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| Zusammenfassung |
| Determining past changes in the amplitude, frequency and teleconnections of
the El Niño-Southern Oscillation (ENSO) is important for understanding
its potential sensitivity to future anthropogenic climate change.
Palaeo-reconstructions from proxy records can provide long-term information
of ENSO interactions with the background climatic state through time.
However, it remains unclear how ENSO characteristics have changed on long
timescales, and precisely which signals proxies record. Proxy
interpretations are typically underpinned by the assumption of stationarity
in relationships between local and remote climates, and often utilise
archives from single locations located in the Pacific Ocean to reconstruct
ENSO histories. Here, we investigate the long-term characteristics of ENSO
and its teleconnections using the Last Millennium experiment of CMIP5
(Coupled Model Intercomparison Project phase 5; Taylor et al.,
2012). We show that the relationship between ENSO conditions (NINO3.4) and
local climates across the Pacific basin differs significantly for 100-year
epochs defining the Last Millennium and the historical period 1906–2005.
Furthermore, models demonstrate decadal- to centennial-scale modulation of
ENSO behaviour during the Last Millennium. Overall, results suggest that
the stability of teleconnections may be regionally dependent and that proxy
climate records may reveal complex changes in teleconnected patterns, rather
than large-scale changes in base ENSO characteristics. As such, proxy
insights into ENSO may require evidence to be considered over large spatial
areas in order to deconvolve changes occurring in the NINO3.4 region from
those relating to local climatic variables. To obtain robust histories of
the ENSO and its remote impacts, we recommend interpretations of proxy
records should be considered in conjunction with palaeo-reconstructions from
within the central Pacific. |
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