The combined impact of subtropical wave train and Polar−Eurasian teleconnection on the extreme cold event over North China in January 2021

Luo, Yongyue; Shi, Jian; An, Xiadong; Li, Chun

doi:10.1007/s00382-022-06520-w

Cited by 13 publications

(10 citation statements)

References 65 publications

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“…In the positive phase of EOF1/EU-AO mode (Figure 5a), corresponding to the positive ART of geopotential height at the starting point of Rossby wave train (Figure 4d), there is significant positive ART of RWS over the western coast of Europe, which is accompanied with obvious anomalous convergence (vectors) in the upper layer and near-surface divergence (figure not shown) as well as the descending vertical motion (figure not shown), and vice versa. It is consistent with previous studies that convergence or divergence anomalies in the upper troposphere are generally supposed to be the fountainhead for a stationary Rossby wave train (Chen, Fang, & Yang, 2020;Chen, Wu, et al, 2020;Luo et al, 2023;Watanabe, 2004). Similarly, in the positive phase of EOF2/EU-NAO mode, the strongest positive ART of RWS is located in the region from east of North Atlantic around 40°N to the western Mediterranean Sea (Figure 5c), and it is consistent with the sinking movements caused by the anomalous convergence in the upper air and divergence in the lower air.…”

Section: Rossby Wave Sourcesupporting

confidence: 93%

“…In this regard, SST in the mid‐latitude may have an effect on the atmosphere circulation anomalies by means of the above‐mentioned transient eddy feedback from the aspect of dynamical process (Ren et al., 2007, 2011). Moreover, increased (decreased) storm track generally corresponds to much more (less) precipitation than normal (figure not shown), which is accompanied with the ascending (descending) vertical motion as well as the ART of upper‐level divergence (convergence), conducive to the excitation of local RWS (Figure 5a; Branstator, 2002; Watanabe, 2004; Luo et al., 2023). In addition, the decreased and increased low‐level westerly winds are beneficial to reduce and enhance the upward LHF in North Atlantic centered around 45° N and 70° N, respectively (Figure 7g; Czaja et al., 2002), resulting in SST warming and cooling over there (Figure 5b).…”

Section: Dynamic Origin and Propagation Processmentioning

confidence: 98%

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The Interannual Wintertime Climate Modes Over Mid‐High Latitude Eurasia and Their Climate Impacts

Zhang,

Sun,

Yuan

et al. 2024

JGR Atmospheres

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Eurasian teleconnection pattern (EU) and its two variants (EU1 and EU2) are the representative wintertime atmospheric teleconnections over Eurasian continent. They are mainly indicative of the local features and closely related to other teleconnection patterns. What are the major interannual climate modes over mid‐high latitude Eurasia in boreal winter is still an open question. With the ERA5 reanalysis data sets after removing the linear impact of El Niño‐Southern Oscillation (ENSO), three wintertime climate modes over mid‐high latitude Eurasia are identified by the first three empirical orthogonal function (EOF) modes of the anomalous relative tendency (ART) of 500 hPa geopotential height. They approximately explain 75% of the interannual variance in total. The three climate modes have combined features of EU‐like patterns with Arctic Oscillation (AO), North Atlantic Oscillation (NAO) and West Atlantic (WA) teleconnections, respectively, and they are named EU‐AO, EU‐NAO and EU‐WA climate modes accordingly. All the three climate modes originate mainly from the North Atlantic and demonstrate clear Rossby wave trains downstream to East Asia along the great circle route, and they can be primarily stimulated and maintained by positive air‐sea feedback over North Atlantic regarding to the obvious North Atlantic tripole‐like sea surface temperature patterns. Interannual climate variations over the most Eurasian continent are strongly linked to and well reproduced by the three ENSO‐independent climate modes, which can be applied as the important signals for monitoring and predicting winter interannual climate variabilities over mid‐high latitude Eurasia.

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Section: Rossby Wave Sourcesupporting

confidence: 93%

Section: Dynamic Origin and Propagation Processmentioning

confidence: 98%

The Interannual Wintertime Climate Modes Over Mid‐High Latitude Eurasia and Their Climate Impacts

Zhang,

Sun,

Yuan

et al. 2024

JGR Atmospheres

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“…One research conducted by Branstator (2002) revealed that AO‐related atmospheric disturbances at high latitudes propagate from the North Atlantic and Europe to Southeast Asia. Moreover, some atmospheric models such as the CMIP6 (Saeed et al., 2023) and linear baroclinic model (Luo et al., 2022) have also adequately reproduced this atmospheric Rossby wave. Thus, such AO‐related teleconnection embedded in the background air flows is physically robust and not very sensitive to the selected cases.…”

Section: Resultsmentioning

confidence: 95%

Joint Impact of the AO and ENSO on Vegetation NPP Over Indo‐Myanmar in Boreal Winter

Lan,

Gong

2024

JGR Atmospheres

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In this paper, the authors quantitatively investigated the joint impact of the Arctic Oscillation (AO) and El Niño‐Southern Oscillation (ENSO) on vegetation net primary productivity (NPP) over Indo‐Myanmar in boreal winter from 1981 to 2018, and found that there is a significant in‐phase variation between them. When the warm ENSO co‐occurs with the positive AO, the NPP in more than 80% of the grids in the study region significantly increases by approximately 24 gC m−2. For the cold ENSO plus the negative AO, the regionally averaged NPP anomalies are approximately −10 gC m−2, and the local minimum is as low as −60 gC m−2. The combination of AO and ENSO can explain approximately 36% of the total variance of NPP in Indo‐Myanmar. The AO/ENSO linkages to the NPP are very likely due to regional precipitation anomalies through atmospheric circulation. In association with the positive (negative) AO, the Rossby wave, propagating eastward along the subtropical jet stream, brings an anomalous cyclone (anticyclone) over Indo‐Myanmar. This enhances (weakens) Indo‐Myanmar Trough, and resulting in more (less) regional precipitation. During the warm (cold) ENSO, through the Gill‐type response, an anomalous high (low)‐pressure appears in the lower and middle troposphere over Philippine‐South China Sea. The Walker circulation is also weaker (stronger) than normal. These are conducive to anomalous southerly (northerly) winds in Indochina. As a result, in the warm ENSO plus positive AO winters, the mean precipitation anomaly in Indo‐Myanmar increased by 27% as averaged for five data sets. In contrast, when the cold ENSO co‐occurs with negative AO, the precipitation is significantly reduced where the largest anomaly exceeds 100 mm in the ERA5. The precipitation changes are consistent with the local NPP anomalies, whereas the temperature does not seem to be a dominant limiting factor.

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“…In fact, the heating above the GS front can reach values as high as 5K/day, or even higher during AR days, which has been reported to be sufficient for triggering wave trains in the troposphere (An et al 2022;Luo et al 2022). The WAF exhibits a wave propagation from the GS region to the Eurasian continent, with gradually decaying amplitude (vectors in Fig.…”

Section: Impacts Of the Gs Front On Rossby Wave Trainmentioning

confidence: 90%

Impact of the Gulf Stream front on atmospheric rivers and Rossby wave train in the North Atlantic

Ma,

Jia,

Han

2023

Preprint

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The Gulf Stream (GS) ocean front exhibits intense ocean-atmosphere interaction in winter, which has a significant impact on the genesis and development of extratropical cyclones in the North Atlantic. The atmospheric rivers (ARs), closely related with the cyclones, transport substantial moisture from the North Atlantic towards the Western European coast. While the influence of the GS front on extratropical cyclones has been extensively studied, its effect on ARs remains unclear. In this study, two sets of ensemble experiments are conducted using a high-resolution global Community Atmosphere Model forced with or without the GS sea surface temperature (SST) front. Our findings reveal that the inclusion of the strong GS front leads to approximately 25% enhancement of water vapor transport and precipitation associated with ARs in the GS region and a more pronounced downstream response in Western Europe, characterized by up to 60% (40%) precipitation increases (reductions) around Spain (Norway). The influence of the GS front on ARs is mediated by both thermodynamic and dynamic factors. The thermodynamic aspect involves an overall increase of water vapor in both the GS region and Western Europe, promoting AR genesis. The dynamic aspect encompasses changes in storm tracks and Rossby wave train, contributing to downstream AR shift. Importantly, we find the co-occurrence of ARs and the GS front is crucial for inducing deep ascending motion and heating above the GS front, which perturbs the deep troposphere and triggers upper-level Rossby wave response. These findings provide a further understanding of the complex interaction between the oceanic front in the western boundary current regions and extratropical weather systems and the associated dynamics behind them.

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The combined impact of subtropical wave train and Polar−Eurasian teleconnection on the extreme cold event over North China in January 2021

Cited by 13 publications

References 65 publications

The Interannual Wintertime Climate Modes Over Mid‐High Latitude Eurasia and Their Climate Impacts

The Interannual Wintertime Climate Modes Over Mid‐High Latitude Eurasia and Their Climate Impacts

Joint Impact of the AO and ENSO on Vegetation NPP Over Indo‐Myanmar in Boreal Winter

Impact of the Gulf Stream front on atmospheric rivers and Rossby wave train in the North Atlantic

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