DOI: 10.1007/s00382-013-2038-8
Scopus记录号: 2-s2.0-84892145762
论文题名: Summer temperature in the eastern part of southern South America: its variability in the twentieth century and a teleconnection with Oceania
作者: Jacques-Coper M. ; Brönnimann S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-07-08 起始页码: 2111
结束页码: 2130
语种: 英语
英文关键词: Interannual variability
; Interdecadal variability
; Oceania
; Patagonia
; South America
; Teleconnection
英文摘要: The 1907–2001 summer-to-summer surface air temperature variability in the eastern part of southern South America (SSA, partly including Patagonia) is analysed. Based on records from instruments located next to the Atlantic Ocean (36°S–55°S), we define indices for the interannual and interdecadal timescales. The main interdecadal mode reflects the late-1970s cold-to-warm climate shift in the region and a warm-to-cold transition during early 1930s. Although it has been in phase with the Pacific Decadal Oscillation (PDO) index since the 1960s, they diverged in the preceding decades. The main interannual variability index exhibits high spectral power at ~3.4 years and is representative of temperature variability in a broad area in the southern half of the continent. Eleven-years running correlation coefficients between this index and December-to-February (DJF) Niño3.4 show significant decadal fluctuations, out-of-phase with the running correlation with a DJF index of the Southern Annular Mode. The main interannual variability index is associated with a barotropic wavetrain-like pattern extending over the South Pacific from Oceania to SSA. During warm (cold) summers in SSA, significant anticyclonic (cyclonic) anomalies tend to predominate over eastern Australia, to the north of the Ross Sea, and to the east of SSA, whereas anomalous cyclonic (anticyclonic) circulation is observed over New Zealand and west of SSA. This teleconnection links warm (cold) SSA anomalies with dry (wet) summers in eastern Australia. The covariability seems to be influenced by the characteristics of tropical forcing; indeed, a disruption has been observed since late 1970s, presumably due to the PDO warm phase. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54642
Appears in Collections: 过去全球变化的重建
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作者单位: Oeschger Centre for Climate Change Research and Institute of Geography, University of Bern, Hallerstrasse 12, Bern, Switzerland
Recommended Citation:
Jacques-Coper M.,Brönnimann S.. Summer temperature in the eastern part of southern South America: its variability in the twentieth century and a teleconnection with Oceania[J]. Climate Dynamics,2014-01-01,43(2017-07-08)