Multi-decadal modulations in the Aleutian-Icelandic Low seesaw and the
                        axial symmetry of the Arctic Oscillation signature, as revealed in the 20th
                        century reanalysis

Shi, Ning; Nakamura, Hisashi

doi:10.3402/tellusa.v66.22660

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…14a). More efforts should be dedicated in the future to understand the interbasin teleconnections (Kucharski et al 2006;Honda et al 2001Honda et al , 2005bChafik et al 2016) and their long-term modulations (Shi and Nakamura 2014) that may lead to a synchronized enhancement of subseasonal variability over the two sectors.…”

Section: Discussionmentioning

confidence: 99%

Modulations of North American and European Weather Variability and Extremes by Interdecadal Variability of the Atmospheric Circulation over the North Atlantic Sector

et al. 2020

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The dominant mode of wintertime interdecadal covariability between sub-seasonal surface air temperature (SAT) variability and mid-tropospheric circulation over the North Atlantic sector is identified through maximum covariance analysis applied to century-long reanalysis data. This mode highlights a tendency for sub-seasonal temperature variability over Europe and eastern North America to be enhanced during decades when the negative phase of the North Atlantic Oscillation (NAO) prevails. This interdecadal NAO is characterized by a stationary Rossby wave train that originates from the subtropical Atlantic, propagates northward into the subpolar Atlantic, and finally refracts towards Europe and the Middle East. A decadal increase in precipitation in the subtropics under the enhanced supply of heat and moisture from the Gulf Stream and its surroundings appears to act as a source for this wave train. The influence of the interdecadal NAO on sub-seasonal SAT variability is explained primarily by the modulated efficiency of baroclinic conversion of available potential energy from the background atmospheric flow to sub-seasonal eddies. The combination of enhanced sub-seasonal variability and low winter-mean temperature anomalies associated with the negative phase of the interdecadal NAO increases the frequency of cold extremes affecting Europe and the eastern U.S.

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Section: Discussionmentioning

confidence: 99%

Modulations of North American and European Weather Variability and Extremes by Interdecadal Variability of the Atmospheric Circulation over the North Atlantic Sector

et al. 2020

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“…An issue remains to be further explored in the future is the possible factors for the change in the spatial structure of the winter AO. Studies have demonstrated that structure of the winter AO can be impacted by several factors, such as the solar cycle [46], polar vortex [47,48], the Aleutian Low-Aleutian Low oscillator [49], and the eastern Pacific atmospheric wave train [50,51]. Individual and combined roles of the above factors in modulating the spatial structure of the winter AO need to be investigated in the future.…”

Section: Summary and Discussionmentioning

confidence: 99%

Recent Strengthened Impact of the Winter Arctic Oscillation on the Southeast Asian Surface Air Temperature Variation

Chen

Song

2019

Atmosphere

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A previous study indicated that the Arctic Oscillation (AO) and Siberian High (SH) are two important drivers for the interannual variation of winter surface air temperature (SAT) over southeast Asia. This study reveals that the impact of the winter SH on the southeast Asian SAT was stable. By contrast, the connection between the winter AO and southeast Asian SAT displays a pronounced interdecadal change around the late-1990s. Significant impact of the winter AO on the southeast Asian SAT can only be detected after the late-1990s. The result shows that change in the impact of the winter AO on southeast Asian SAT was mainly attributed to change in the spatial structure of the AO. Before the late-1990s, significant atmospheric signals related to the winter AO were confined to the North Atlantic region and the atmospheric anomalies over Eurasia were weak. As such, impact of the winter AO on the southeast Asian SAT was weak. By contrast, after the late-1990s, winter AO displays a more zonally symmetric structure, with significant negative sea level pressure (SLP) anomalies over the Arctic, and positive anomalies over mid-latitudes. Specifically, the positive SLP anomalies over East China induce clear northerly wind anomalies over southeast Asia, which lead to negative SAT anomalies there via wind-induced temperature advection. Hence, the winter AO has a significant impact on the southeast Asian SAT after the late-1990s. Further analysis shows that after the late-1990s, hindcast skill of the winter southeast Asian SAT anomalies was enhanced when taking both the winter AO and SH into account.

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“…Previous studies found that the spatial structure of the AO is not stationary under certain specific conditions (Honda and Nakamura 2001;Castanheira and Graf 2003;Zhao and Moore 2009;Sun and Tan 2013;Shi and Nakamura 2014;Dai and Tan 2017). In this section, we investigate whether the wintertime AO pattern itself is variable during the different periods of 1920-2010.…”

Section: B Time-varying Ao Pattern During the Winters Of 1920-2010mentioning

confidence: 95%

“…From another aspect, some studies found that the spatial structure of the AO is nonstationary and that the Pacific center of the AO cannot be observed very often (e.g., Honda and Nakamura 2001;Castanheira and Graf 2003;Zhao and Moore 2009;Sun and Tan 2013;Shi and Nakamura 2014;Dai and Tan 2017). For example, Honda and Nakamura (2001) pointed out that the amplitude of the Pacific AO pattern is linked to the Aleutian low and the Icelandic low seesaw (AIS) pattern in late winter (February-March) during 1973-94.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Honda and Nakamura (2001) pointed out that the amplitude of the Pacific AO pattern is linked to the Aleutian low and the Icelandic low seesaw (AIS) pattern in late winter (February-March) during 1973-94. During the twentieth century, the leading mode of SLP variability over the Northern Hemisphere is remarkably different in different phases of the AIS (Shi and Nakamura 2014). Besides, the Pacific center of the AO pattern can also be modulated significantly by the stratospheric polar vortex.…”

Section: Introductionmentioning

confidence: 99%

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Multidecadal Fluctuation of the Wintertime Arctic Oscillation Pattern and Its Implication

et al. 2018

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The multidecadal fluctuations in the patterns and teleconnections of the winter mean Arctic Oscillation (AO) are investigated based on observational and reanalysis datasets. Results show that the Atlantic center of the AO pattern remains unchanged throughout the period 1920–2010, whereas the Pacific center of the AO is strong during 1920–59 and 1986–2010 and weak during 1960–85. Consequently, the link between the AO and the surface air temperature over western North America is strong during 1920–59 and 1986–2010 and weak during 1960–85. The time-varying Pacific center of the AO motivates a revisit to the nature of the AO from the perspective of decadal change. It reveals that the North Pacific mode (NPM) and North Atlantic Oscillation (NAO) are the inherent regional atmospheric modes over the North Pacific and North Atlantic, respectively. Their patterns over the North Pacific and North Atlantic remain stable and change little with time during 1920–2010. The Atlantic center of the AO always resembles the NAO over the North Atlantic, but the Pacific center of the AO only resembles the NPM over the North Pacific when the NPM–NAO coupling is strong. These results suggest that the AO seems to be fundamentally rooted in the variability over the North Atlantic and that the annular structure of the AO very likely arises from the coupling of the atmospheric modes between the North Pacific and North Atlantic.

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Multi-decadal modulations in the Aleutian-Icelandic Low seesaw and the axial symmetry of the Arctic Oscillation signature, as revealed in the 20th century reanalysis

Cited by 18 publications

References 34 publications

Modulations of North American and European Weather Variability and Extremes by Interdecadal Variability of the Atmospheric Circulation over the North Atlantic Sector

Modulations of North American and European Weather Variability and Extremes by Interdecadal Variability of the Atmospheric Circulation over the North Atlantic Sector

Recent Strengthened Impact of the Winter Arctic Oscillation on the Southeast Asian Surface Air Temperature Variation

Multidecadal Fluctuation of the Wintertime Arctic Oscillation Pattern and Its Implication

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