scholarly journals Intraseasonal Variation of the Strength of the East Asian Trough and Its Climatic Impacts in Boreal Winter

2016 ◽  
Vol 29 (7) ◽  
pp. 2557-2577 ◽  
Author(s):  
Lei Song ◽  
Lin Wang ◽  
Wen Chen ◽  
Yang Zhang
Keyword(s):  
East Asia ◽  
East Asian ◽  
Quantitative Description ◽  
Storm Track ◽  
Northern Eurasia ◽  
Boreal Winter ◽  
Near Surface ◽  
East Asian Trough ◽  
Climatic Impacts

Abstract The East Asian trough (EAT) is a distinct component of the boreal winter circulation whose strength corresponds to the amplitude of the Northern Hemispheric stationary waves. In this study, the mechanism and climatic impacts of the intraseasonal variations of the EAT’s strength are investigated through composite analysis and dynamical diagnostics. The significant roles played by the low-frequency Rossby wave (RW) and synoptic transient eddy (TE) are revealed. Before the peaks of strong EAT events, an upper-tropospheric RW train propagates across northern Eurasia and interacts with preexisting surface cold anomalies over central Siberia. This pattern intensifies the Siberian high and causes RW convergence toward the EAT, leading to 30% of the EAT’s amplification directly via the RW-induced feedback forcing. Meanwhile, RW weakens the background baroclinicity and reduces TE activities near the entrance region of the North Pacific storm track. The TE-induced feedback forcing leads to another 30% of the EAT’s amplification. The evolution and dynamical processes of the weak EAT events generally resemble those of the strong events with opposite signs. These results are consistent with the knowledge on the mechanism of the strong and weak EAT events regarding the role of RWs with additional quantitative description and provide new insights regarding the role of TEs. Variations of the EAT’s strength exert significant climatic impacts on East Asia and its downstream region. Near-surface air temperature is below (above) normal over East Asia during the growth and peak stages of the strong (weak) EAT events and above (below) normal over North America afterward.

scholarly journals Recent Winter Precipitation Changes over Eastern China in Different Warming Periods and the Associated East Asian Jets and Oceanic Conditions

2017 ◽  
Vol 30 (12) ◽  
pp. 4443-4462 ◽  
Author(s):  
Danqing Huang ◽  
Aiguo Dai ◽  
Jian Zhu ◽  
Yaocun Zhang ◽  
Xueyuan Kuang
Keyword(s):  
East Asia ◽  
Southern China ◽  
East Asian ◽  
Eastern China ◽  
Winter Precipitation ◽  
Northeastern China ◽  
Boreal Winter ◽  
The South ◽  
East Asian Trough ◽  
Siberian High

Global-mean surface temperature has experienced fast warming during 1985–98 but stabilized during 1999–2013, especially in boreal winter. Climate changes over East Asia between the two warming periods and the associated mechanisms have not been fully understood. Analyses of observation and reanalysis data show that winter precipitation has decreased (increased) over southern (northeastern) China from 1985–98 to 1999–2013. Winds at 300 hPa over East Asia strengthened during 1999–2013 around 30°–47.5°N but weakened to the north and south of it. This change pattern caused the East Asian polar front jet (EAPJ) and the East Asian subtropical jet (EASJ) to shift, respectively, equatorward and poleward during 1999–2013. Associated with these jet displacements, the Siberian high enhanced and the East Asian trough shifted westward. The enhanced Siberian high strengthened the East Asian winter monsoon and weakened southwesterly winds over the South China Sea, leading to precipitation decreases over southern China. The westward shift of the East Asian trough enhanced convergence and precipitation over northeastern China. A combination of a negative phase of the interdecadal Pacific oscillation and a positive phase of the Atlantic multidecadal oscillation during 1999–2013 resulted in significant tropospheric warming over the low and high latitudes and cooling over the midlatitudes of East Asia. These changes enhanced the meridional temperature gradient and thus westerlies over the region between the two jets but weakened them to the south and north of it, thereby contributing to the wind change patterns and the jet displacements.

Domestic Politics and Nationalism in East Asian Security

2017 ◽  
Author(s):  
Randall L. Schweller
Keyword(s):  
East Asia ◽  
Domestic Politics ◽  
East Asian ◽  
Primary Factor ◽  
Security Policies ◽  
Asian Security ◽  
Rise Of China ◽  
East Asian Security ◽  
The Rise Of China

This chapter works within the neoclassical realist tradition to examine the role of nationalism in foreign policymaking and the implication for the international politics of East Asia. Whereas the rise of China is an important structural factor necessarily affecting states' security policies throughout East Asia, China's rise does not determine these states' security policies. Rather, domestic politics ultimately determines how a state responds to changing security circumstances. In particular, nationalism can drive states to adopt more belligerent policies than warranted by their strategic environment, thus contributing to heightened bilateral conflicts and regional tension. The chapter argues that, in contemporary East Asia, rising China sets the context of policymaking, but domestic politics has been the primary factor shaping policy.

The Transnational Archive of the Sinosphere: The Early Modern East Asian Information Order

2018 ◽  
Author(s):  
Kiri Paramore
Keyword(s):  
Information Systems ◽  
Early Modern ◽  
East Asia ◽  
Chinese Language ◽  
East Asian ◽  
Global History ◽  
Early Modern Japan ◽  
Information Order ◽  
Modern Information

This chapter argues for the existence of an intellectually Confucian-centred, Classical Chinese language delivered archive of knowledge across early modern East Asia. I argue that this broad, transferable, and often commercially delivered Sinosphere archive supported the creation of state-led information orders in early modern East Asia. This argument resonates with recent work in South Asian and Global History demonstrating the role of regional early modern information orders in facilitating global flows of knowledge. I focus particularly on the transregional nature of the literary, pedagogical, and book culture that underlay the information order of early modern East Asia, and the state’s prime role in its development in early modern Japan. The article thus employs the concept of archivality to analyse early modern information systems, demonstrating patterns of trans-regional knowledge development in East Asia which resonate with other early modern global examples.

scholarly journals Further inquiry into the interaction between the winter North Pacific storm track and the East Asian trough

2020 ◽  
Vol 55 (3-4) ◽  
pp. 471-483
Author(s):  
Minghao Yang ◽  
Chongyin Li ◽  
Yanke Tan ◽  
Xin Li ◽  
Xiong Chen ◽  
...  
Keyword(s):  
North Pacific ◽  
East Asian ◽  
Storm Track ◽  
East Asian Trough ◽  
North Pacific Storm Track

Pandemic expands role of South-east Asian philanthropy

2020 ◽  
Keyword(s):  
Civil Society ◽  
East Asia ◽  
East Asian ◽  
South East Asia ◽  
Content Type ◽  
Non Profit ◽  
Economic Distress ◽  
Severe Recession ◽  
Private Philanthropy

Subject Private philanthropy. Significance In South-east Asia, as elsewhere, there is growing pressure on civil society, from non-profit organisations to corporations, to help address the economic distress and social dislocation caused by the COVID-19 pandemic. Impacts Despite government and philanthropic efforts, South-east Asia is expected to experience a severe recession. A rise in philanthropy by religious organisations will fuel religious polarisation and the risk of violence post-crisis. Indonesia’s non-profit sector will likely experience a particularly sharp funding dip as foreign donations fall.

scholarly journals HISTORIES OF MODERN MIGRATION IN EAST ASIA: STUDIES OF THE FIRST HALF OF THE TWENTIETH CENTURY

2017 ◽  
Vol 14 (2) ◽  
pp. 171-195
Author(s):  
Noriaki Hoshino ◽  
Qian Zhu
Keyword(s):  
Twentieth Century ◽  
East Asia ◽  
English Language ◽  
East Asian ◽  
Border Crossing ◽  
Japanese Empire ◽  
Social Transformations ◽  
Theoretical Approaches ◽  
Heterogeneous Features

In recent historical studies of modern East Asia, the issue of migration has received increased scholarly attention. This article traces recent historiographical and methodological trends by analyzing influential English-language works on modern East Asian migrations in the first half of the twentieth century. Modern East Asian migrations during this period present dynamic and heterogeneous features as results of modern social transformations, such as the development of global capitalism, national and global economic integration, the emergence of new transportation and communication technology, and the expansion and collapse of the Japanese empire. Accordingly, the historical works on modern East Asian migrations we examine display a variety of historiographical and theoretical approaches. Specifically, this article underscores important trends or comparable emphases in these studies, including the growing scholarly interest in transnational/regional border crossing movements, migrants’ subject formations in the new environments, and the methodological interest in the role of culture, political economy, and the environment. Thus this article offers a reflective overview of the ongoing development of migration studies centering on modern East Asia.

scholarly journals Seasonal Prediction Skill of Northern Extratropical Surface Temperature Driven by the Stratosphere

2017 ◽  
Vol 30 (12) ◽  
pp. 4463-4475 ◽  
Author(s):  
Liwei Jia ◽  
Xiaosong Yang ◽  
Gabriel Vecchi ◽  
Richard Gudgel ◽  
Thomas Delworth ◽  
...  
Keyword(s):  
Climate Model ◽  
Lower Troposphere ◽  
Polar Vortex ◽  
Seasonal Prediction ◽  
The Arctic ◽  
Northern Eurasia ◽  
Stratospheric Polar Vortex ◽  
Near Surface ◽  
Predictive Skill

This study explores the role of the stratosphere as a source of seasonal predictability of surface climate over Northern Hemisphere extratropics both in the observations and climate model predictions. A suite of numerical experiments, including climate simulations and retrospective forecasts, are set up to isolate the role of the stratosphere in seasonal predictive skill of extratropical near-surface land temperature. It is shown that most of the lead-0-month spring predictive skill of land temperature over extratropics, particularly over northern Eurasia, stems from stratospheric initialization. It is further revealed that this predictive skill of extratropical land temperature arises from skillful prediction of the Arctic Oscillation (AO). The dynamical connection between the stratosphere and troposphere is also demonstrated by the significant correlation between the stratospheric polar vortex and sea level pressure anomalies, as well as the migration of the stratospheric zonal wind anomalies to the lower troposphere.

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