globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00382-017-4015-0
Scopus记录号: 2-s2.0-85035802160
论文题名:
Teleconnection stationarity, variability and trends of the Southern Annular Mode (SAM) during the last millennium
作者: Dätwyler C.; Neukom R.; Abram N.J.; Gallant A.J.E.; Grosjean M.; Jacques-Coper M.; Karoly D.J.; Villalba R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期:2018-05-06
起始页码: 2321
结束页码: 2339
语种: 英语
英文关键词: Climate change ; Climate reconstruction ; Holocene ; Paleoclimate ; Southern Hemisphere
Scopus关键词: annual variation ; climate variation ; Holocene ; paleoclimate ; reconstruction ; Southern Hemisphere ; teleconnection ; trend analysis ; Australia ; New Zealand ; South America ; Tasmania
英文摘要: The Southern Annular Mode (SAM) is the leading mode of atmospheric interannual variability in the Southern Hemisphere (SH) extra-tropics. Here, we assess the stationarity of SAM spatial correlations with instrumental and paleoclimate proxy data for the past millennium. The instrumental period shows that temporal non-stationarities in SAM teleconnections are not consistent across the SH land areas. This suggests that the influence of the SAM index is modulated by regional effects. However, within key-regions with good proxy data coverage (South America, Tasmania, New Zealand), teleconnections are mostly stationary over the instrumental period. Using different stationarity criteria for proxy record selection, we provide new austral summer and annual mean SAM index reconstructions over the last millennium. Our summer SAM reconstructions are very robust to changes in proxy record selection and the selection of the calibration period, particularly on the multi-decadal timescale. In contrast, the weaker performance and lower agreement in the annual mean SAM reconstructions point towards changing teleconnection patterns that may be particularly important outside the summer months. Our results clearly portend that the temporal stationarity of the proxy-climate relationships should be taken into account in the design of comprehensive regional and hemispherical climate reconstructions. The summer SAM reconstructions show no significant relationship to solar, greenhouse gas and volcanic forcing, with the exception of an extremely strong negative anomaly following the AD 1257 Samalas eruption. Furthermore, reconstructed pre-industrial summer SAM trends are very similar to trends obtained by model control simulations. We find that recent trends in the summer SAM lie outside the 5–95% range of pre-industrial natural variability. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109151
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland; Research School of Earth Sciences and ARC Centre of Excellence for Climate System Science, Australian National UniversityACT, Australia; School of Earth, Atmosphere and Environment, Monash UniversityVIC 3800, Australia; Departamento de Geofísica and Center for Climate and Resilience Research, Universidad de Concepción, Concepción, Chile; School of Earth Sciences and ARC Centre of Excellence for Climate System Science, University of Melbourne, Melbourne, VIC 3010, Australia; Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CCT CONICET, Mendoza, 5500, Argentina

Recommended Citation:
Dätwyler C.,Neukom R.,Abram N.J.,et al. Teleconnection stationarity, variability and trends of the Southern Annular Mode (SAM) during the last millennium[J]. Climate Dynamics,2018-01-01,51(2018-05-06)
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