Large‐scale circulation anomalies associated with persistent low temperature over Southern China in January 2008

Bueh, Cholaw; Shi, Ning; Xie, Zhenghui

doi:10.1002/asl.333

Cited by 48 publications

(44 citation statements)

References 14 publications

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“…Time-mean anomalies of (a),(b) 500-hPa geopotential height (gpm; contour interval 5 30 gpm) and (c),(d) surface air temperature (colors) and areas with significant precipitation (green shading) for the two UB events averaged (left) from 30 December 2007 to 12 January 2008 (event 1) and (right) from 17 to 30 January 2008 (event 2). This leads to persistent low temperatures and snow-ice weather over southern China from 15 to 31 January 2008 (Wen et al 2009;Bueh et al 2011;Han et al 2011), but this is not the case for event 1 (Figs. In (c),(d), the dotted regions are above the 95% confidence level based on a two-sided Student's t test and the dark arrows denote the time-mean 850-hPa total wind vector.…”

Section: A Case Study Of the January 2008 Cold Event Overmentioning

confidence: 99%

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Impact of Ural Blocking on Winter Warm Arctic–Cold Eurasian Anomalies. Part II: The Link to the North Atlantic Oscillation

et al. 2016

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In Part I of this study, the Ural blocking (UB)-induced amplification role of winter warm Arctic-cold Eurasian (WACE) anomalies has been examined. It was found that the long-lived UB together with the positive North Atlantic Oscillation (NAO 1 ) significantly contributes to the amplification of the WACE pattern. The present study examines how the UB variability affects quasi-biweekly WACE (QB-WACE) anomalies and depends on the NAO 1 and North Atlantic conditions by classifying the UB based on a case study of a cold event that occurred over southern China in January 2008. A composite analysis during 1979-2013 shows that the QB-WACE anomalies associated with the UB that often occur with the NAO 1 are strong and influenced by the North Atlantic jet (NAJ) and zonal wind strengths over Eurasia. For NAO 1 -related UB, the QB-WACE anomaly depends strongly on the location of UB, and the UB anomalies lag the NAO 1 by approximately 4-7 days.The strength of the NAJ determines whether the combined NAO 1 and UB anomalies exhibit a negative East Atlantic/West Russia (EA/WR 2 ) pattern, while the region of weak zonal winds over Eurasia and the zonal extent of the NAJ dominate the location of UB. For southward-, eastward-, and westward-displaced UBs associated with a strong NAJ, the NAO 1 favors the UB with a southward-displaced QB-WACE anomaly through wave train propagation like an EA/WR 2 pattern. Eastward-and southward-displaced UB anomalies induce similarly displaced cold anomalies with intrusion into southern China. However, for a northward-displaced UB, this happens without pronounced EA/WR 2 patterns because of a weak NAJ and is accompanied by a northward-displaced QB-WACE anomaly.

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Section: A Case Study Of the January 2008 Cold Event Overmentioning

confidence: 99%

“…The persistent cold temperatures and severe snow-ice weather over southern China in January 2008 are typical examples of extreme cold events over East Asia (Wen et al 2009;Han et al 2011;Bueh et al 2011). Thus, it is reasonable to classify the UB pattern in terms of its zonal and meridional positions.…”

Section: A Case Study Of the January 2008 Cold Event Overmentioning

confidence: 99%

Impact of Ural Blocking on Winter Warm Arctic–Cold Eurasian Anomalies. Part II: The Link to the North Atlantic Oscillation

et al. 2016

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“…This cyclone appears as a merge of the two wave trains. Previous studies have identified the effects on the cold events over East Asia of either the north wave train (Bueh et al, ; Hsu, ; Hsu & Wallace, ; Joung & Hitchman, ; Lau & Lau, ; Park et al, ; Song et al, ; Suda, ; Takaya & Nakamura, , , ; Wu & Chan, ; Yang & Li, ; Yao et al, ) or the south wave train (Song & Wu, ; Wen et al, ). Here, we detect that the two wave trains may coexist in association with intraseasonal variability of the East Asian winter monsoon.…”

Section: Two Wave Trains Associated With the East Asian Intraseasonalmentioning

confidence: 99%

“…The occurrence of East Asian cold events has been linked to a wave train over the middle-to-high latitude Eurasia (Bueh et al, 2011;Hsu, 1987;Hsu & Wallace, 1985;Joung & Hitchman, 1982;Lau & Lau, 1984;Park et al, 2011;Song et al, 2016;Song & Wu, 2017;Suda, 1957;Takaya & Nakamura, 2005a, 2005bWu & Chan, 1997;Yang & Li, 2016;Yao et al, 2016). The wave train propagates eastward along the polar jet stream.…”

Section: Introductionmentioning

confidence: 99%

Individual and Combined Impacts of Two Eurasian Wave Trains on Intraseasonal East Asian Winter Monsoon Variability

Jiao

Song

2019

JGR Atmospheres

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The present study investigates the intraseasonal wind variations over East Asia during boreal winter. It is shown that the wind variations less than 30 days are the main component of total intraseasonal signal. The intraseasonal variations in this time period are associated with two distinctive wave trains over Eurasia starting from the North Atlantic Ocean. One wave train propagates along the polar front jet eastward over Europe and Siberia and then southeastward after passing the Lake Baikal. The other wave train propagates along the subtropical jet southeastward through the Mediterranean region and the Arabian Peninsula to north India and then eastward to southern China. The East Asian wind and temperature anomalies are determined by the combination of the two wave trains. An anomalous cyclone forms over East Asia with large extent and intensity when the two wave trains work coherently, resulting in strong lower‐level northerly wind anomalies with a large meridional extent. More cold air is transported southward from high latitudes by anomalous northerly winds, causing widespread and large temperature decrease in East Asia. When only a single wave train exists, lower‐level wind and temperature anomalies are reduced. When there is a destructive interference of the two wave trains, the lower‐level wind and temperature anomalies are weak in East Asia. Observational analyses and barotropic model experiments indicate that the formation of the two wave trains may be related to the combination of disturbances at different locations over the North Atlantic Ocean.

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“…For example, four consecutive years of cold winters occurred over Northern Asia from 2009/2010to 2012/2013(Bueh et al, 2011Buchan et al, 2014;Gong et al, 2014;Qiao et al, 2014). Under global warming, frequent cold winters over Northern Asia may have an impact on the subsequent spring and summer climate, but there has been little research focusing on this earlier signal.…”

Section: Introductionmentioning

confidence: 99%

Relationship between cold winters over Northern Asia and the subsequent hot summers over mid‐lower reaches of the Yangtze River valley under global warming

Qiao

Gong

Feng

et al. 2015

Atmospheric Science Letters

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Under global warming, cold winters over Northern Asia are highly correlated with the subsequent hot summers over middle and lower reaches of the Yangtze River valley (MLYRV). This high correlation may result from an oceanic bridge's effect in the Western Pacific. The mechanism may be described as follows: the atmospheric circulation anomalies of cold winters corresponds with a simultaneous warmer Western Pacific warm pool (WPWP) by decreasing surface latent heat fluxes. The warmer sea surface temperature (SST) can persist and move eastward gradually to the subsequent summer through the oceanic processes, and thus in turn affect the hot days (HDs) over MLYRV.

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Large‐scale circulation anomalies associated with persistent low temperature over Southern China in January 2008

Cited by 48 publications

References 14 publications

Impact of Ural Blocking on Winter Warm Arctic–Cold Eurasian Anomalies. Part II: The Link to the North Atlantic Oscillation

Impact of Ural Blocking on Winter Warm Arctic–Cold Eurasian Anomalies. Part II: The Link to the North Atlantic Oscillation

Individual and Combined Impacts of Two Eurasian Wave Trains on Intraseasonal East Asian Winter Monsoon Variability

Relationship between cold winters over Northern Asia and the subsequent hot summers over mid‐lower reaches of the Yangtze River valley under global warming

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