Possible mechanisms for four regimes associated with cold events over East Asia

Yang, Zhi; Huang, Wenyu; Wang, Bin; Chen, Ruyan; Wright, Jonathon S.; Ma, Wenqian

doi:10.1007/s00382-017-3905-5

Cited by 28 publications

(19 citation statements)

References 58 publications

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“…The mean blocking frequency over western Siberia for the wintertime extreme precipitation events was 5.7%, double the climatological mean value of 2.8%. As demonstrated by Yang et al (2017), the presence of a blocking high or anticyclonic anomaly over western Siberia favors cold air intrusions into the eastern parts of the Eurasian continent, downstream of the anomalous anticyclone. Possible relationships between such cold air intrusions and temperature anomalies over the SETP are examined in section 5.…”

Section: Composite Evolution Of the Large-scale Circulationmentioning

confidence: 95%

On the Formation Mechanism for Wintertime Extreme Precipitation Events Over the Southeastern Tibetan Plateau

et al. 2018

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The formation mechanism for wintertime extreme precipitation events over the southeastern Tibetan Plateau (SETP) is explored. The crucial step in the development of these events was the emergence of a cyclonic anomaly above the Tibetan Plateau. Wave activity fluxes along a Rossby wave train embedded in the subtropical jet stream (i.e., the circumglobal teleconnection) played the dominant role in producing this cyclonic anomaly, supported by weaker wave activity fluxes along a second Rossby wave train originating over Scandinavia. The cyclonic anomaly then moved over the SETP, favored strong updrafts, large‐scale moisture convergence, and intense precipitation. Extreme precipitation was more likely to ensue when the arrival of the cyclonic anomaly was preceded by persistent warm anomalies over the SETP, which favored moisture accumulation there. Temperatures above the SETP dropped sharply around the onset of the extreme precipitation. A heat budget analysis indicates that adiabatic cooling associated with convective ascent along the downstream edge of the cyclone played a leading role in this temperature drop, while a cold air intrusion associated with an anticyclonic anomaly over western Siberia (one center of action along the second wave train) played a complementary role. An Eulerian moisture budget analysis shows that variations in precipitable water delayed the onset and enhanced the intensity of these events, with moisture for precipitation delivered to the SETP mainly through the western and southern boundaries. A companion Lagrangian moisture source analysis reveals that the land areas south of the Tibetan Plateau typically contributed 78.7% of the moisture supply for these events.

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Section: Composite Evolution Of the Large-scale Circulationmentioning

confidence: 95%

On the Formation Mechanism for Wintertime Extreme Precipitation Events Over the Southeastern Tibetan Plateau

et al. 2018

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“…It has been argued that the warming in the Arctic is conducive to the occurrence of the midlatitude atmospheric blocking (Francis & Vavrus, 2015;Walsh, 2014). Midlatitude atmospheric blocking is known to play an important role in the extreme temperature and precipitation events in the Atlantic-European sector and East Asia (e.g., Huang et al, 2018;Sillmann et al, 2011;Sillmann & Croci-Maspoli, 2009;Yang et al, 2018). The role of Ural blocking in contributing to the warm Arctic-cold Eurasia temperature pattern and the association with the reduction of sea ice and the temperature variability over the B/K Sea are highlighted by Luo et al (2016).…”

Section: Introductionmentioning

confidence: 99%

The Influences of the Arctic Troposphere on the Midlatitude Climate Variability and the Recent Eurasian Cooling

Jung

Semmler

2018

JGR Atmospheres

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Understanding the influence of the Arctic troposphere on the climate at midlatitudes is critical for projecting the impacts of ongoing and anticipated Arctic changes such as Arctic amplification and rapid sea ice decline over the Northern Hemisphere. In this study, we analyze a suite of atmospheric model experiments, with and without atmospheric relaxation toward reanalysis data, to study the impacts of the Arctic troposphere on the midlatitude atmospheric circulation and climate variability. The Arctic troposphere is found to strongly impact the interannual variability of the atmospheric circulation and temperature over the midlatitude continents. The major mechanisms for the impacts of Arctic troposphere include the modulation of the large‐scale atmospheric circulation, the associated heat transport over the continents, and the impacts on synoptic variations in the North Atlantic‐European sector. The impact of the Arctic troposphere on the intensity of the Siberian High is an important factor for how the Arctic can influence temperature variability in south Siberia and East Asia. The trends in the Arctic troposphere in recent decades are closely linked to the recent winter cooling in Northern Eurasia. These recent cooling trends are not driven by the trends in sea surface temperature/sea ice, tropical atmosphere, and the stratosphere. It is argued that the temperature trend pattern of warm Arctic‐cold Eurasia is a manifestation of two possibly independent phenomena and the cooling trend is contributed to by the Arctic troposphere through impacting the large‐scale atmospheric circulation, the atmospheric blocking frequency, and the intensity of the Siberian High.

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“…Downstream of the Siberian High, robust northerly winds prevail over the coastal areas of East Asia and surrounding oceans. This climatological circulation favors the frequent occurrence of cold surges associated with the transport of cold, dry air masses from high latitudes (Chen et al, ; Song et al, ; Wang et al, , ; Yang et al, ). The prevailing northerly winds and associated incursions of cold, dry air also inhibit water vapor transport into East Asia from the surrounding oceans, including the South China Sea, the western North Pacific, and Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

Moisture Sources for Wintertime Extreme Precipitation Events Over South China During 1979–2013

Huang

Yang

et al. 2018

JGR Atmospheres

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A Lagrangian approach is applied to explore the evaporative moisture sources within the boundary layer for 103 wintertime extreme precipitation events over South China during 1979China during -2013 Oceanic sources provided about 67.7% of the moisture for these extreme precipitation events, with terrestrial sources providing the remaining parts. The five most important moisture source regions were the South China Sea (30.

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Possible mechanisms for four regimes associated with cold events over East Asia

Cited by 28 publications

References 58 publications

On the Formation Mechanism for Wintertime Extreme Precipitation Events Over the Southeastern Tibetan Plateau

On the Formation Mechanism for Wintertime Extreme Precipitation Events Over the Southeastern Tibetan Plateau

The Influences of the Arctic Troposphere on the Midlatitude Climate Variability and the Recent Eurasian Cooling

Moisture Sources for Wintertime Extreme Precipitation Events Over South China During 1979–2013

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