North Atlantic Multidecadal Variability Enhancing Decadal Extratropical Extremes in Boreal Late Summer in the Early Twenty-First Century

Zhang, Jie; Chen, Zhiheng; Chen, Haishan; Teshome, Asaminew

doi:10.1175/jcli-d-19-0536.1

Cited by 19 publications

(8 citation statements)

References 88 publications

(137 reference statements)

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“…Previous studies have suggested when the AMO is in the warm North Atlantic phase, the summer NAO tends to be in its negative phase (Folland; et al., 2009; Knight et al., 2005; Sutton & Hodson, 2005; J. Zhang et al., 2020). Here, we have investigated the possible linkage between the Atlantic SST and summer NAO after performing the 9 years low‐pass filtering (Figure 4).…”

Section: Resultsmentioning

confidence: 97%

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The Unstable Relationship Between the Precipitation Dipole Pattern in the Tibetan Plateau and Summer NAO

Liu

Chen

2021

Geophysical Research Letters

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Substantial progress has been made in understanding the relationship between summer precipitation in the Tibetan Plateau (TP) and North Atlantic Oscillation (NAO), but impacts of the summer NAO on precipitation spatial pattern remain controversial. Using the long‐term observational and reanalysis datasets, we have identified the intimate relationship between summer NAO and TP precipitation dipole pattern has been weakened since the late 1990s. Changes in regional atmospheric circulation induced by the asymmetrical wave propagation structure along the Eurasian continent are responsible for this weakened linkage. Further analyses revealed that the wave propagation anomalies are mainly induced by interdecadal change of summer NAO, which is attributed to the Atlantic multidecadal oscillation (AMO) variations. Moreover, the model simulations derived from the Geophysical Fluid Dynamics Laboratory (GFDL AM2.1) provide direct evidence to demonstrate that the AMO phase transition contributes to the unstable relationship between the summer NAO and precipitation dipole pattern in the eastern TP.

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Section: Resultsmentioning

confidence: 97%

“…Previous studies have suggested when the AMO is in the warm North Atlantic phase, the summer NAO tends to be in its negative phase Knight et al, 2005;Sutton & Hodson, 2005;J. Zhang et al, 2020).…”

Section: Resultsmentioning

confidence: 98%

The Unstable Relationship Between the Precipitation Dipole Pattern in the Tibetan Plateau and Summer NAO

Liu

Chen

2021

Geophysical Research Letters

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“…Both the N‐S shift and the W‐E extending of the NA JS change with global warming, exhibiting an anomaly basic flow, which is identified to link to NA and Eurasian continent (Woollings and Blackburn, 2012; Zhang et al ., 2019a). Besides, the positive AMO since the mid‐1990s can cause SRP‐like atmospheric anomalies(Zhang et al ., 2020), and result in Eurasian summer nonuniform warming, which could have important effect on the wave patterns and KE.…”

Section: Resultsmentioning

confidence: 99%

“…A positive North Atlantic Oscillation (NAO), associated with the North Atlantic SST mode, excites a high‐latitude Rossby wave train, which modulates the Ural high, Okhotsk blocking high (Wu et al ., 2012) and a mid‐latitude Eurasian wave train via the Tibetan Plateau (Sato and Takahashi, 2006; Xin et al ., 2010; Cui et al ., 2015). Previous studies also suggested that the Atlantic Multidecadal Oscillation (AMO) could excite the Silk Road Pattern‐like responses and impact on the Eurasian nonuniform warming could increase the baroclinicity and energy conversion (Sun et al ., 2019; Zhang et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

Increasing energy transfer over Eurasia and the North Atlantic enhancing the Eurasian low‐frequency wave and boreal summer droughts in China

Zhang

Zhao

Chen

2020

Intl Journal of Climatology

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The prolonged droughts that frequently occur in northern China are related to persistent anomalies of circulation and the low‐frequency waves. To explore the formation of the low‐frequency waves and the related internal variability and external forcing, the intra‐seasonal kinetic energy (KE) and the corresponding energy transfer terms are investigated algorithmically with multiscale energy and vorticity analysis. The results show two major energy sources located over the central North Atlantic (NA) and Europe, with increasing baroclinicity and energy conversion. The major energy conversion is from basic flow to intra‐seasonal KE, which corresponds to a southeastern extension of NA jet stream (JS) exit and the northward shift in the entrance of Afro Asian JS. JS shifts are helpful to the conjunction of both JS, and thereby enhance JS waveguide and wave energy dispersion. In addition, with increasing surface temperature and diabatic heating over Europe and the Mediterranean Sea, there are increase baroclinicity that facilitates the buoyancy energy conversion, ascending KE flux and positive pressure flux in the lower troposphere, those result in higher mid‐upper‐troposphere KE. The divergent energy contributes to the development and enhancement of the low‐frequency waves, favouring the extratropical eddy, wave structure, and quasi‐stationary waves amplitude, which is thereby conducive to magnified wave amplitude and extreme droughts in northern China. The results emphasize the internal dynamics and local forcing and provide prediction reference for extratropical extremes.

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“…Notably, the SST anomalies have significant interdecadal climate variability, such as AMO and Pacific Decadal Oscillation, which are ascribed to the wind stress and thermocline changes of the oceans physical processes (Black et al., 2014; Guo et al., 2020; Knight et al., 2006; Z. Liu, 2012). Besides, the interdecadal variation of the SST anomaly could modulate the interannual variability of SST and the associated atmospheric anomalies (Folland et al., 2009; J. Zhang et al., 2020; L. Wang et al., 2008). This is mainly because the different phase of the interdecadal variability of SST provide different background of climatic conditions (Power et al., 1999).…”

Section: Summary and Discussionmentioning

confidence: 99%

Changes in the Dominant Mode of Summer Precipitation Over the Central‐Eastern Tibetan Plateau Around the Mid‐1990s

et al. 2022

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The interdecadal changes in the dominant mode of the summer precipitation over the central‐eastern Tibetan Plateau (TP) are investigated around the mid‐1990s. It is found that the leading empirical orthogonal function mode of the interannual variations of summer precipitation over the central‐eastern TP is shown an out‐of‐phase pattern, with opposite variation between the southeastern and northeastern TP during 1961–1996, while the dominant mode become an in‐phase pattern during 1997–2019. During 1961–1996, the dipole pattern of TP precipitation is mainly related to the North Atlantic Oscillation (NAO) and associated circulation anomalies. However, the impact of NAO on the dipole pattern of TP precipitation has weakened since the mid‐1990s. In contrast, during 1997–2019, more pronounced positive height anomalies in the upper troposphere are observed over the whole TP regions. Meanwhile, the southerly moisture flux from the Bay of Bengal and the Philippine Sea is prevalent significantly with strong moisture convergence. Further analysis demonstrates that this interdecadal spatial change is mainly linked to the significant increasing of the sea surface temperature in the North Atlantic, South Atlantic, and Indo‐Pacific warm pool, via wave trains propagation. The wave train‐related positive height anomalies over the TP regions are in favor of the strengthening of the South Asian high (SAH). Moreover, the zonal and meridional mean temperature advections by SAH‐related circulation anomalies are primarily responsible for the intense vertical flow anomalies. Consequently, the summer precipitation anomalies over the entire TP regions are largely enhanced and formed the mono‐sign pattern during 1997–2019.

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North Atlantic Multidecadal Variability Enhancing Decadal Extratropical Extremes in Boreal Late Summer in the Early Twenty-First Century

Cited by 19 publications

References 88 publications

The Unstable Relationship Between the Precipitation Dipole Pattern in the Tibetan Plateau and Summer NAO

The Unstable Relationship Between the Precipitation Dipole Pattern in the Tibetan Plateau and Summer NAO

Increasing energy transfer over Eurasia and the North Atlantic enhancing the Eurasian low‐frequency wave and boreal summer droughts in China

Changes in the Dominant Mode of Summer Precipitation Over the Central‐Eastern Tibetan Plateau Around the Mid‐1990s

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