Subseasonal relationship between Arctic and Eurasian surface air temperature

Kim, Hye-Jin; Son, Seok‐Woo; Moon, Wonkyu; Kug, Jong‐Seong; Hwang, Jaeyoung

doi:10.1038/s41598-021-83486-5

Cited by 32 publications

(30 citation statements)

References 40 publications

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“…Shading shows the SLP anomaly composite over these events at the case-defined peak of maximum heating within the main heating domain for blocking trajectories (for 29 Ural and 10 Scandinavian events in panels (a) and (b), respectively; see also Tables S2 and S4 tic. The majority of the residual events show a weaker ridge over the Urals, which is consistent with the study from Kim et al (2021), showing that 22 % of the WACE patterns are in fact driven by weaker anticyclonic anomalies over the Urals rather than a stronger blocking high.…”

Section: Discussionsupporting

confidence: 88%

“…15c) enabling penetration of heat and moisture into the polar cap, leading to Arctic warming (Fearon et al, 2020;Papritz and Dunn-Sigouin, 2020). These results support the importance of Ural blocking or similar circulation anomalies over the Urals in promoting horizontal temperature advection (Kim et al, 2021) or enhanced moisture flux convergence (Gong and Luo, 2017) in the periphery of the blocks, thus giving rise to warming in the high-Arctic, especially via the increased downward longwave radiation in the Arctic. This anomalous moisture transport is also seen in Fig.…”

Section: Discussionsupporting

confidence: 70%

“…Specifically, Gong and Luo (2017) show that Ural blocking is an important amplifier of sea-ice loss in the Barents-Kara seas (BKS) via increased surface air temperature (SAT) anomalies over BKS concurrent with the enhanced northward moisture flux convergence and the intensified downward longwave radiation. The in-phase correlation between BKS SAT anomalies and anticyclonic anomalies over the Ural region is also noted by Kim et al (2021), emphasizing the major role of horizontal temperature advection in driving the observed WACE patterns, whereas the budget analysis reveals a canceling of the warming by diabatic and adiabatic cooling induced by Ural blocking.…”

Section: Weather Systems and Importance Of Blockingmentioning

confidence: 72%

“…In particular, Ural blocking has been associated with Arctic sea-ice loss as well as the so-called warm-Arctic-cold-Eurasian (WACE) temperature pattern (Luo et al, 2016b, a;Tyrlis et al, 2019;Kim et al, 2021). Specifically, Gong and Luo (2017) show that Ural blocking is an important amplifier of sea-ice loss in the Barents-Kara seas (BKS) via increased surface air temperature (SAT) anomalies over BKS concurrent with the enhanced northward moisture flux convergence and the intensified downward longwave radiation.…”

Section: Weather Systems and Importance Of Blockingmentioning

confidence: 99%

See 3 more Smart Citations

Interaction between Atlantic cyclones and Eurasian atmospheric blocking drives wintertime warm extremes in the high Arctic

Murto

Caballero

Svensson

et al. 2022

Weather Clim. Dynam.

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Abstract. Atmospheric blocking can influence Arctic weather by diverting the mean westerly flow and steering cyclones polewards, bringing warm, moist air to high latitudes. Recent studies have shown that diabatic heating processes in the ascending warm conveyor belt branch of extratropical cyclones are relevant to blocking dynamics. This leads to the question of the extent to which diabatic heating associated with mid-latitude cyclones may influence high-latitude blocking and drive Arctic warm events. In this study we investigate the dynamics behind 50 extreme warm events of wintertime high-Arctic temperature anomalies during 1979–2016. Classifying the warm events based on blocking occurrence within three selected sectors, we find that 30 of these events are associated with a block over the Urals, featuring negative upper-level potential vorticity (PV) anomalies over central Siberia north of the Ural Mountains. Lagrangian back-trajectory calculations show that almost 60 % of the air parcels making up these negative PV anomalies experience lifting and diabatic heating (median 11 K) in the 6 d prior to the block. Further, almost 70 % of the heated trajectories undergo maximum heating in a compact region of the mid-latitude North Atlantic, temporally taking place between 6 and 1 d before arriving in the blocking region. We also find anomalously high cyclone activity (on average five cyclones within this 5 d heating window) within a sector northwest of the main heating domain. In addition, 10 of the 50 warm events are associated with blocking over Scandinavia. Around 60 % of the 6 d back trajectories started from these blocks experience diabatic heating, of which 60 % undergo maximum heating over the North Atlantic but generally closer to the time of arrival in the block and further upstream relative to heated trajectories associated with Ural blocking. This study suggests that, in addition to the ability of blocks to guide cyclones northwards, Atlantic cyclones play a significant role in the dynamics of high-latitude blocking by providing low-PV air via moist-diabatic processes. This emphasizes the importance of the mutual interactions between mid-latitude cyclones and Eurasian blocking for wintertime Arctic warm extremes.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 70%

Section: Weather Systems and Importance Of Blockingmentioning

confidence: 72%

Section: Weather Systems and Importance Of Blockingmentioning

confidence: 99%

See 2 more Smart Citations

Interaction between Atlantic cyclones and Eurasian atmospheric blocking drives wintertime warm extremes in the high Arctic

Murto

Caballero

Svensson

et al. 2022

Weather Clim. Dynam.

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“…Much attention has been devoted to the extent to which Arctic ice loss and/or regional atmospheric blocking can be associated with weather and climate extremes in the midlatitudes and whether and how local, midlatitude, and tropical features influence the Arctic ice. There is now a large and growing body of literature directed at aspects of these issues [22][23][24][25][26][27][28][29][30][31][32] and they reveal much about the intricate interrelationships between these climate components.…”

Section: Introductionmentioning

confidence: 99%

Trends and variability in polar sea ice, global atmospheric circulations, and baroclinicity

Simmonds

2021

Annals of the New York Academy of Sciences

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We analyze the polar sea ice distribution and the global sea level pressure (SLP) and baroclinicity distributions over the "satellite" period of 1979-2020. In the Arctic, there are statistically significant sea ice extent (SIE) decreases in all calendar months, and the annual mean has lost 2.22 million km 2 over the four decades. The Antarctic SIE, in marked contrast, increased up to 2014, then commenced a remarkable retreat (the annual mean ice extent decreased by 2.03 million km 2 in the 3 years to 2017), and subsequently increased to near its long-term average value in 2020. The shifts in seasonal-mean SLP patterns are consistent with a warming planet. At the synoptic scale, we diagnose the changes in the baroclinicity, the mechanism by which cyclones, fronts, and other weather systems are generated. Through a novel presentation, we give an overview of the relative roles of changes in the vertical shear and static stability in influencing the global trends in baroclinicity. In both the Arctic and Antarctic regions, baroclinicity is shown to have increased in each season (with the sole exception of the Arctic in summer). This increase, coupled with midlatitude decreases in baroclinicity, results in poleward shifts of the storm tracks.

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Significant relationship between Arctic warming and East Asia hot summers

Kim

Jun

Lee

et al. 2022

Intl Journal of Climatology

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Arctic warming is of growing interest because it could affect midlatitude climates. Even though numerous studies have paid attention to the relationship between Arctic warming and the midlatitude climate in winter, the influence of Arctic warming on the summer conditions has not been examined in depth. Here we identify a significant relationship between East Asia hot summers and Arctic warming over the Barents and Kara seas. To represent Arctic warming, we define a combined index by simply differencing the normalized surface air temperature and sea-ice indices. We found that the combined index in July has significantly high correlations with the temperatures in China, Korea, and Japan. While the teleconnection mechanism is not completely revealed, it is evident that warming over the Barents and Kara seas is accompanied by the local development of an anomalous anticyclone and downstream wave trains, which yield a strong anticyclonic circulation over East Asia and the North Pacific. The anticyclonic circulation persists and intensifies until August, which leads to hot summer conditions in East Asia with warm advection and enhanced shortwave radiation. Our results suggest that Arctic climate conditions can be used as a useful precursor of East Asia temperature variations even in summer.

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Subseasonal relationship between Arctic and Eurasian surface air temperature

Cited by 32 publications

References 40 publications

Interaction between Atlantic cyclones and Eurasian atmospheric blocking drives wintertime warm extremes in the high Arctic

Interaction between Atlantic cyclones and Eurasian atmospheric blocking drives wintertime warm extremes in the high Arctic

Trends and variability in polar sea ice, global atmospheric circulations, and baroclinicity

Significant relationship between Arctic warming and East Asia hot summers

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