Linking Emergence of the Central Pacific El Niño to the Atlantic Multidecadal Oscillation

Yu, Jin‐Yi; Kao, Pei Ken; Paek, Houk; Hsu, Huang‐Hsiung; Hung, Chih Wen; Lu, Mong Ming; An, Soon Il

doi:10.1175/jcli-d-14-00347.1

Cited by 179 publications

(140 citation statements)

References 54 publications

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“…This may be associated with the shift of the location of the El Niño developing phase from the Eastern Pacific to the Central Pacific since the early 1990s. Yu et al [38] pointed out that the reason for this shift is possibly from the influence of AMO. A4 represents the events with particularly rare and extremely heavy precipitation in one season, which mainly occurred in the years around 2000 (e.g., the serious storm and flood in 1998 because of the infrequent El Niño occurrence [5,6,36]).…”

Section: Trend Analysis Of the Archetype Occurrencementioning

confidence: 99%

Spatiotemporal Variability of Extreme Summer Precipitation over the Yangtze River Basin and the Associations with Climate Patterns

Hao

Yuan

et al. 2017

Water

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Abstract:Understanding the spatiotemporal variability of seasonal extreme precipitation and its linkage with climate patterns is of great importance for water resource management over the Yangtze River Basin. Hence, this study examined the spatiotemporal variability of seasonal extreme precipitation through the archetypal analysis (AA), by which observations were decomposed and characterized as several extreme modes. Six archetypes were identified and can obviously exhibit the features of events with above average or below average precipitation. Summer precipitation is the most variable compared to the winter, spring, and autumn precipitation through the trend analysis. It ranged from extremely dry (A6) to normal (A1 and A2) to extremely wet (A4). Climate teleconnections to the four archetypes for summer precipitation and relative importance of climate patterns were thus investigated. Results show that El Niño Southern Oscillation index is the strongest determinant of the ensuing archetypes representing the events with above average precipitation, while the Atlantic Multi-decadal Oscillation (AMO) contributes most to the events with below-average precipitation. A warm phase of the Pacific Decadal Oscillation (PDO) is significantly correlated with the above-average precipitation.

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Section: Trend Analysis Of the Archetype Occurrencementioning

confidence: 99%

Spatiotemporal Variability of Extreme Summer Precipitation over the Yangtze River Basin and the Associations with Climate Patterns

Hao

Yuan

et al. 2017

Water

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“…It supports the existence of strong Central Pacific La Niñas (strong negative values of IC3), as in 1943-1944 (see Figure 10), especially during the positive phase of AMO (see the negative loading factor of PC2 for IC3 in Table 5). The loading factors of PC4, PC5, and PC2 contributing to IC3 (Table 5) also reflect the tendency for CP-El Niño (CP-La Niña) during negative (positive) phases of AMO [79], which is visible through the symmetrical correlation signals of IC3 with SSTA (Figure 11), respectively, in CP and North Atlantic areas. The imprint of the characteristic South Pacific dipole shown in EOF10 is also visible in the loading map (Figure 12).…”

Section: 4mentioning

confidence: 78%

Independent Subspace Analysis of the Sea Surface Temperature Variability: Non-Gaussian Sources and Sensitivity to Sampling and Dimensionality

Pires

Hannachi

2017

Complexity

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We propose an expansion of multivariate time-series data into maximally independent source subspaces. The search is made among rotations of prewhitened data which maximize non-Gaussianity of candidate sources. We use a tensorial invariant approximation of the multivariate negentropy in terms of a linear combination of squared coskewness and cokurtosis. By solving a high-order singular value decomposition problem, we extract the axes associated with most non-Gaussianity. Moreover, an estimate of the Gaussian subspace is provided by the trailing singular vectors. The independent subspaces are obtained through the search of "quasiindependent" components within the estimated non-Gaussian subspace, followed by the identification of groups with significant joint negentropies. Sources result essentially from the coherency of extremes of the data components. The method is then applied to the global sea surface temperature anomalies, equatorward of 65 ∘ , after being tested with non-Gaussian surrogates consistent with the data anomalies. The main emerging independent components and subspaces, supposedly generated by independent forcing, include different variability modes, namely, The East-Pacific, the Central Pacific, and the Atlantic Niños, the Atlantic Multidecadal Oscillation, along with the subtropical dipoles in the Indian, South Pacific, and South-Atlantic oceans. Benefits and usefulness of independent subspaces are then discussed.

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“…This results in positive geopotential height anomalies along a low-latitude belt (centered around 20°N). The AMO-associated Central Pacific El Niño can also support troposphere warming and positive height anomalies in the mid-troposphere (Yu et al 2015). This is why the regressed SLP anomaly pattern shows a dipole structure between the western and eastern halves of the NH, while the 500-hPa height anomaly pattern exhibits an in-phase structure over most of the NH, centered along the low latitudes.…”

Section: Connections Between the Amo And Teleconnection Patternsmentioning

confidence: 99%

Impacts of four northern-hemisphere teleconnection patterns on atmospheric circulations over Eurasia and the Pacific

Gao

Paek

2016

Theor Appl Climatol

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The impacts of four teleconnection patterns on atmospheric circulation components over Eurasia and the Pacific region, from low to high latitudes in the Northern Hemisphere (NH), were investigated comprehensively in this study. The patterns, as identified by the Climate Prediction Center (USA), were the East Atlantic (EA), East Atlantic/ Western Russia (EAWR), Polar/Eurasia (POLEUR), and Scandinavian (SCAND) teleconnections. Results indicate that the EA pattern is closely related to the intensity of the subtropical high over different sectors of the NH in all seasons, especially boreal winter. The wave train associated with this pattern serves as an atmospheric bridge that transfers Atlantic influence into the low-latitude region of the Pacific. In addition, the amplitudes of the EAWR, SCAND, and POLEUR patterns were found to have considerable control on the "Vangengeim-Girs" circulation that forms over the AtlanticEurasian region in winter or spring. The EA and EAWR mainly affect the westerlies in winter and spring and the POLEUR and SCAND, respectively, in summer and winter. Strong westerlies confine the extension of the North Polar vortex, which generally results in a small weak vortex and a shallow East Asian trough located in a position further east than normal. Furthermore, the North Polar vortex presents significant connections with the patterns during winter and summer. Analyses in this work suggest that the teleconnection patterns in summer could be driven, at least partly, by the Atlantic Multidecadal Oscillation, which to some degree might transmit the influence of the Atlantic Ocean to Eurasia and the Pacific region.

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Linking Emergence of the Central Pacific El Niño to the Atlantic Multidecadal Oscillation

Cited by 179 publications

References 54 publications

Spatiotemporal Variability of Extreme Summer Precipitation over the Yangtze River Basin and the Associations with Climate Patterns

Spatiotemporal Variability of Extreme Summer Precipitation over the Yangtze River Basin and the Associations with Climate Patterns

Independent Subspace Analysis of the Sea Surface Temperature Variability: Non-Gaussian Sources and Sensitivity to Sampling and Dimensionality

Impacts of four northern-hemisphere teleconnection patterns on atmospheric circulations over Eurasia and the Pacific

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