Nearly Synchronous Multidecadal Oscillations of Surface Air Temperature in Punta Arenas and the Atlantic Multidecadal Oscillation Index

Kayano, Mary Toshie; Setzer, Alberto

doi:10.1175/jcli-d-17-0793.1

Cited by 2 publications

(3 citation statements)

References 48 publications

(59 reference statements)

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“…They linked this Atlantic-Antarctic teleconnection to changes in the Atlantic Multidecadal Oscillation (AMO). Kayano and Setzer (2018) also found a multidecadal relation between AMO-induced circulation anomalies and temperature variations in Punta Arenas, southern Chile. The literature cited above provides an overview of the spatial and temporal scales on which circulation variabilities can affect the Antarctic climate.…”

Section: Introductionmentioning

confidence: 63%

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Spatiotemporal Variability of the Southern Annular Mode and its Influence on Antarctic Surface Temperatures

et al. 2020

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The Southern Annular Mode (SAM) is the predominant atmospheric variability mode in the Southern Hemisphere. In this paper, we present the spatial variability results of the SAM pattern for the period 1979-2018. The SAM-intrinsic pattern variability analysis is based on the principal component analysis (PCA), which is carried out for the ERA-Interim 500 hPa geopotential height (GPH) data set. A spatiotemporally resolved data set of SAM pattern maps (PCA loadings) is derived by projecting monthly shifted sub-sequences of SAM index values (PCA scores) on the corresponding GPH anomalies. The dominant SAM structure within single pattern fields is mapped automatically and can be interpreted as the Southern Hemisphere polar front. This data set allows an analysis of the geographical positions of the characteristic circumpolar SAM structure over four decades and shows considerable variability over space and time. Five different states of SAM patterns, which are associated with characteristic circulation anomalies during different phases of the study period, are identified. Station-based Antarctic temperature anomalies can be synoptically explained by these circulation anomalies. The overall latitudinal trend of the SAM pattern indicates an intensification of the meridional structure, especially over the East Antarctic Southern Ocean. Furthermore, we show that the SAM pattern variability is significantly correlated with the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation. Composites of 500 hPa GPH anomalies during the positive and negative phases of the respective indices indicate teleconnections with Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation, and this can explain latitudinal trends of the SAM pattern.

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Section: Introductionmentioning

confidence: 63%

“…They linked this Atlantic‐Antarctic teleconnection to changes in the Atlantic Multidecadal Oscillation (AMO). Kayano and Setzer (2018) also found a multidecadal relation between AMO‐induced circulation anomalies and temperature variations in Punta Arenas, southern Chile.…”

Section: Introductionmentioning

confidence: 87%

Spatiotemporal Variability of the Southern Annular Mode and its Influence on Antarctic Surface Temperatures

et al. 2020

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“…It affects the Atlantic hurricane activity [9], North American and European summer climate [10], African Sahel rainfall [9,11], Asian monsoon [12][13][14], and summer rainfall over India [15]. Over South America, important linkages with the AMO have been described for precipitation variability over northeastern Brazil [8,16], surface air temperature of southern South America [17], and the dynamics of low-level jets [18,19]. More specifically, Jones and Carvalho [18] analyzed the influence of the AMO on decadal to multidecadal variability in the South American low-level jet (SALLJ).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Atlantic Multidecadal Oscillation on South American Atmosphere Dynamics and Precipitation

et al. 2022

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The Atlantic Multidecadal Oscillation (AMO) is coherently linked to climate variations over many parts of the globe. Despite recent achievements, the mechanism by which the AMO influences regional precipitation over South America is not well understood. In this study, we isolate the atmospheric response to the AMO using a water isotope-enabled version of the Community Earth System Model version 1.2 (iCESM1.2) and determine its influence on (sub)tropical South American regional precipitation and atmospheric circulation. The results suggest an interhemispheric seesaw in Hadley circulation strength and that the section of the Atlantic Hadley cell is marked by a stronger upward air component south of the equator during the cold AMO phase. We also find that the precipitation anomalies over (sub)tropical South America during AMO phases are mainly related to changes in the Atlantic Intertropical Convergence Zone (ITCZ) core strength, where in the cold (warm) AMO phase the core region strengthens (weakens) from February to July, while from July to November the core region weakens (strengthens). Our results stress the importance of acknowledging the dynamics of season- and regional-dependent ITCZ responses, as they are sufficient to produce observed AMO-related signals even in the absence of marked changes in the ITCZ position.

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Nearly Synchronous Multidecadal Oscillations of Surface Air Temperature in Punta Arenas and the Atlantic Multidecadal Oscillation Index

Cited by 2 publications

References 48 publications

Spatiotemporal Variability of the Southern Annular Mode and its Influence on Antarctic Surface Temperatures

Spatiotemporal Variability of the Southern Annular Mode and its Influence on Antarctic Surface Temperatures

Influence of the Atlantic Multidecadal Oscillation on South American Atmosphere Dynamics and Precipitation

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