scholarly journals Interdecadal Changes in the Relationship between ENSO, EAWM, and the Wintertime Precipitation over China at the End of the Twentieth Century

2017 ◽  
Vol 30 (6) ◽  
pp. 1923-1937 ◽  
Author(s):  
Xiaojing Jia ◽  
Jingwen Ge
Keyword(s):  
Twentieth Century ◽  
Southern Oscillation ◽  
Winter Precipitation ◽  
Interdecadal Change ◽  
Northwestern Pacific ◽  
Southeastern China ◽  
Precipitation Anomalies ◽  
The Impact ◽  
The Relationship ◽  
Interdecadal Changes

Abstract The current study investigates the interdecadal changes in the relationship between the winter precipitation anomalies in southeastern China, El Niño–Southern Oscillation (ENSO), and the East Asian winter monsoon (EAWM) at the end of the twentieth century. It appears that the relationships between the interannual variability of the southeastern China winter precipitation and ENSO as well as EAWM are obviously weakened after 1998/99. The possible mechanisms accounting for this interdecadal change in the relationship have been examined by dividing the data into two subperiods [1980–98 (P1) and 1999–2015 (P2)]. The results indicate that, without the linear contribution of EAWM, ENSO only play a limited role in the variability of winter precipitation in southeastern China in both subperiods. In contrast, in P1, corresponding to an ENSO-independent weaker-than-normal EAWM, anomalous southerlies along coastal southeastern China associated with an anticyclone over the northwestern Pacific transport water vapor to China. However, in P2 the impact of EAWM on winter precipitation in southeastern China is weakened because of the regime shift of EAWM. The EAWM-related positive SLP anomalies over the North Pacific move eastward in P2, causing an eastward migration of the associated anomalous southerlies along its western flank and therefore cannot significantly contribute to the positive winter precipitation anomalies in southeastern China.

scholarly journals Strengthened Relationships of Northwest China Wintertime Precipitation with ENSO and Midlatitude North Atlantic SST since the Mid-1990s

2020 ◽  
Vol 33 (10) ◽  
pp. 3967-3988
Author(s):  
Xiaoxue Yin ◽  
Lian-Tong Zhou
Keyword(s):  
North Atlantic ◽  
Arctic Oscillation ◽  
Southern Oscillation ◽  
Northwest China ◽  
Winter Precipitation ◽  
Sea Surface ◽  
Physical Processes ◽  
Atmospheric Teleconnections ◽  
Precipitation Anomalies ◽  
The Relationship

AbstractThe present study investigates the interdecadal changes in the relationship between El Niño–Southern Oscillation (ENSO) and midlatitude North Atlantic (MNA) sea surface temperature (SST) with northwest China (NWC) winter precipitation (WP) variability and the plausible causes. Results show that ENSO and MNA SST have weak correlations with NWC WP before the mid-1990s, whereas the connections are enhanced sharply afterward, with above (below) normal precipitation occuring when there are positive (negative) ENSO SST and negative (positive) MNA SST anomalies (SSTA). Remarkable differences are found in the atmospheric circulations. After the mid-1990s, there is a pronounced Pacific–North American–Eurasian (PNA-EU)-like pattern in the Northern Hemisphere, whereas an Arctic Oscillation–like pattern is found before the mid-1990s. The change in the relationships between NWC WP and SSTs is likely attributable to the enhanced connection between ENSO and MNA SST after the mid-1990s. It is found that ENSO and MNA SSTA can cause NWC WP variation independently through atmospheric teleconnections. In addition, significant precipitation anomalies also occur when concurrent but oppositely signed SSTs anomalies in the two regions are observed. The reinforced negative correlations between ENSO and MNA SST after the mid-1990s act in concert on NWC WP by exciting a PNA-EU-like pattern. This information would help us to better understand the physical processes of the teleconnections between NWC WP variability and the ENSO/MNA SST, in which the strength of the correlation between ENSO and MNA SST should be taken into account.

scholarly journals Seasonal Prediction of Winter Precipitation Anomalies over Central Southwest Asia: A Canonical Correlation Analysis Approach

2018 ◽  
Vol 31 (2) ◽  
pp. 727-741 ◽  
Author(s):  
Sapna Rana ◽  
James Renwick ◽  
James McGregor ◽  
Ankita Singh
Keyword(s):  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Canonical Correlation ◽  
Southern Oscillation ◽  
Winter Precipitation ◽  
Southwest Asia ◽  
Potential Predictability ◽  
The Pacific ◽  
Precipitation Anomalies ◽  
The Impact

Central southwest Asia (CSWA; 20°–47°N, 40°–85°E) is a water-stressed region prone to significant variations in precipitation during its winter precipitation season of November–April. Wintertime precipitation is crucial for regional water resources, agriculture, and livelihood; however, in recent years droughts have been a notable feature of CSWA interannual variability. Here, the predictability of CSWA wintertime precipitation is explored based on its time-lagged relationship with the preceding months’ (September–October) sea surface temperature (SST), using a canonical correlation analysis (CCA) approach. For both periods, results indicate that for CSWA much of the seasonal predictability arises from SST variations in the Pacific related to El Niño–Southern Oscillation (ENSO) and the Pacific decadal oscillation (PDO). Additional sources of skill that play a weaker predictive role include long-term SST trends, North Atlantic variability, and regional teleconnections. CCA cross-validation skill shows that the regional potential predictability has a strong dependency on the ENSO phenomenon, and the strengthening (weakening) of this relationship yields forecasts with higher (lower) predictive skill. This finding is validated by the mean cross-validated correlation skill of 0.71 and 0.38 obtained for the 1980/81–2014/15 and 1950/51–2014/15 CCA analyses, respectively. The development of cold (warm) ENSO conditions during September–October, in combination with cold (warm) PDO conditions, is associated with a northward (southward) shift of the jet stream and a strong tendency of negative (positive) winter precipitation anomalies; other sources of predictability influence the regional precipitation directly during non-ENSO years or by modulating the impact of ENSO teleconnection based on their relative strengths.

scholarly journals The relationship between landslide activity and weather: examples from Hungary

2003 ◽  
Vol 3 (1/2) ◽  
pp. 43-52 ◽  
Author(s):  
J. Szabó
Keyword(s):  
Case Studies ◽  
Winter Precipitation ◽  
Unconsolidated Sediments ◽  
Rainfall Events ◽  
Landscape Type ◽  
Landslide Processes ◽  
Landscape Types ◽  
The Impact ◽  
The Relationship ◽  
Precipitation Events

Abstract. The paper presents the impact of irregular rainfall events triggering landslides in the regional context of landslides in Hungary. The author’s experience, gathered from decades of observations, confirms that landslide processes are strongly correlate with precipitation events in all three landscape types (hill regions of unconsolidated sediments; high bluffs along river banks and lake shores; mountains of Tertiary stratovolcanoes). Case studies for each landscape type underline that new landslides are triggered and old ones are reactivated by extreme winter precipitation events. This assertion is valid mainly for shallow and translational slides. Wet autumns favour landsliding, while the triggering influence of intense summer rainfalls is of a subordinate nature. A recent increasing problem lies in the fact that on previously unstable slopes, stabilised during longer dry intervals, an intensive cultivation starts, thus increasing the damage caused by movements during relatively infrequent wet winters.

Islamic Modernism, Political Reform and the Arabisation of Education: The Relationship between Moroccan Nationalists and al-Azhar University

2015 ◽  
Author(s):  
Ann Wainscott
Keyword(s):  
Twentieth Century ◽  
Political Reform ◽  
Educational Policies ◽  
Nationalist Movement ◽  
Religious Reform ◽  
Ideological Position ◽  
The University ◽  
The Impact ◽  
The Relationship ◽  
Islamic Modernism

This chapter studies the impact of al Azhar University on the Moroccan nationalist movement and specifically its independence leader Allal al Fasi, whose ten-year exile in Egypt exposed him to the ideas of Muhammad Abduh and influenced the ideological position of the Moroccan independence party, Istiqlal. The chapter emphasises the impact that Abduh's ideas had on the educational policies of the independence party and their continued importance in Moroccan educational politics throughout the twentieth century. Graduates of the university, including Abdullah ibn Idris al Sanusi and Abu Shu'ayb al Dukkali, brought ideas of Islamic modernism back to Morocco. These ideas were shared with Moroccan religious students through lectures at the Qarawiyyin University in Fez and flourished into a movement for religious reform.

Power and Place

2020 ◽  
pp. 186-233
Author(s):  
Erika Hanna
Keyword(s):  
Twentieth Century ◽  
Social Justice ◽  
Documentary Photography ◽  
Irish Society ◽  
The People ◽  
History Of ◽  
Societal Problems ◽  
New Generation ◽  
The Impact ◽  
The Relationship

Chapter 6 surveys the history of documentary photography in twentieth-century Ireland. In particular, it examines the emergence of a new generation of documentary photographers and their role in debates about the nature of Irish society from the 1970s to the 1990s. Self-consciously radical, these photographers aimed to use their work to expose injustice and ‘reveal’ the hidden side of Irish life. In particular, the chapter focuses on the career of three photographers: Derek Speirs, Joanne O’Brien, and Frankie Quinn. It uses close readings of the work of these photographers, contemporaneous photography magazines, coupled with the extensive use of oral histories to explore the impact of documentary photography on Ireland in the later twentieth century. In their depiction of poverty as both visceral and uncomfortable, they challenged the traditional iconography of Ireland which had aestheticized or even eulogized these themes. Moreover, these photographers were often self-conscious and reflective regarding the relationship between themselves and the people—often in difficult circumstances—whom they portrayed. Nevertheless, they were often forced to make difficult choices about the depiction of poverty, violence, and injustice which attempted to expose societal problems without being voyeuristic. An exploration of choices they made regarding how they engaged with their subjects, what they photographed, and where they published provides a way of exploring the visual economies of social justice in later twentieth-century Ireland.

scholarly journals Atmospheric teleconnection patterns and eddy kinetic energy content: wavelet analysis

2004 ◽  
Vol 11 (3) ◽  
pp. 295-301 ◽  
Author(s):  
V. N. Khokhlov ◽  
A. V. Glushkov ◽  
I. A. Tsenenko
Keyword(s):  
Kinetic Energy ◽  
North Atlantic ◽  
Energy Content ◽  
Southern Oscillation ◽  
Eddy Kinetic Energy ◽  
The North ◽  
The North Atlantic ◽  
The Impact ◽  
The Relationship

Abstract. In this paper, we employ a non-decimated wavelet decomposition to analyse long-term variations of the teleconnection pattern monthly indices (the North Atlantic Oscillation and the Southern Oscillation) and the relationship of these variations with eddy kinetic energy contents (KE) in the atmosphere of mid-latitudes and tropics. Major advantage of using this tool is to isolate short- and long-term components of fluctuations. Such analysis allows revealing basic periodic behaviours for the North Atlantic Oscillations (NAO) indices such as the 4-8-year and the natural change of dominant phase. The main results can be posed as follows. First, if the phases of North Atlantic and Southern Oscillations vary synchronously with the 4-8-year period then the relationship between the variations of the NAO indices and the KE contents is the most appreciable. Second, if the NAO phase tends to abrupt changes then the impact of these variations on the eddy kinetic energy contents in both mid-latitudes and tropics is more significant than for the durational dominance of certain phase.

The Actress-Manager and the Movies: Resolving the Double Life of Sarah Bernhardt

2018 ◽  
Vol 45 (1) ◽  
pp. 27-55 ◽  
Author(s):  
Victoria Duckett
Keyword(s):  
Nineteenth Century ◽  
Twentieth Century ◽  
Film Industry ◽  
Silent Film ◽  
Late Nineteenth Century ◽  
Modern Media ◽  
Business Experience ◽  
Late Nineteenth ◽  
The Impact ◽  
The Relationship

Sarah Bernhardt is one of the most globally celebrated actress-managers of the late nineteenth century. Bernhardt’s fame, however, is rarely associated with silent film. This article explores the coincidence between Sarah Bernhardt’s role as a theatrical manager in the late nineteenth and early twentieth century and her pioneering work in the nascent film industry. I argue that Bernhardt was not only a performer and manager in the theatre, but a creative agent in modern media industries. Questions about the relationship between Bernhardt and early film allow us to discuss the formation of female business experience in the theatre and its subsequent movement into a cinematographic culture that would dominate and define twentieth-century culture and commerce. Even if Bernhardt is regarded as a ‘lone entrepreneur’ and therefore extraneous to broader national discussions of theatrical industrialisation, it is important to understand the impact she has as a media celebrity who used film in order to expand her own twentieth-century global marketability.

scholarly journals The Predictability of Interdecadal Changes in ENSO Activity and ENSO Teleconnections

2006 ◽  
Vol 19 (19) ◽  
pp. 4755-4771 ◽  
Author(s):  
Scott Power ◽  
Malcolm Haylock ◽  
Rob Colman ◽  
Xiangdong Wang
Keyword(s):  
Time Scales ◽  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
La Niña ◽  
Enso Teleconnections ◽  
La Nina ◽  
Sst Anomaly ◽  
The Relationship ◽  
Interdecadal Changes

Abstract El Niño–Southern Oscillation (ENSO) in a century-long integration of a Bureau of Meteorology Research Centre (BMRC) coupled general circulation model (CGCM) drives rainfall and temperature changes over Australia that are generally consistent with documented observational changes: dry/hot conditions occur more frequently during El Niño years and wet/mild conditions occur more frequently during La Niña years. The relationship between ENSO [as measured by Niño-4 or the Southern Oscillation index (SOI), say] and all-Australia rainfall and temperature is found to be nonlinear in the observations and in the CGCM during June–December: a large La Niña sea surface temperature (SST) anomaly is closely linked to a large Australian response (i.e., Australia usually becomes much wetter), whereas the magnitude of an El Niño SST anomaly is a poorer guide to how dry Australia will actually become. Australia tends to dry out during El Niño events, but the degree of drying is not as tightly linked to the magnitude of the El Niño SST anomaly. Nonlinear or asymmetric teleconnections are also evident in the western United States/northern Mexico. The implications of asymmetric teleconnections for prediction services are discussed. The relationship between ENSO and Australian climate in both the model and the observations is strong in some decades, but weak in others. A series of decadal-long perturbation experiments are used to show that if these interdecadal changes are predictable, then the level of predictability is low. The model’s Interdecadal Pacific Oscillation (IPO), which represents interdecadal ENSO-like SST variability, is statistically linked to interdecadal changes in ENSO’s impact on Australia during June–December when ENSO’s impact on Australia is generally greatest. A simple stochastic model that incorporates the nonlinearity above is used to show that the IPO [or the closely related Pacific Decadal Oscillation (PDO)] can appear to modulate ENSO teleconnections even if the IPO–PDO largely reflect unpredictable random changes in, for example, the relative frequency of El Niño and La Niña events in a given interdecadal period. Note, however, that predictability in ENSO-related variability on decadal time scales might be either underestimated by the CGCM, or be too small to be detected by the modest number of perturbation experiments conducted. If there is a small amount of predictability in ENSO indices on decadal time scales, and there may be, then the nonlinearity described above provides a mechanism via which ENSO teleconnections could be modulated on decadal time scales in a partially predictable fashion.

scholarly journals Interactions of ENSO, the IOD, and the SAM in CMIP3 Models

2011 ◽  
Vol 24 (6) ◽  
pp. 1688-1704 ◽  
Author(s):  
Wenju Cai ◽  
Arnold Sullivan ◽  
Tim Cowan
Keyword(s):  
Southern Oscillation ◽  
Global Climate ◽  
Coupled Model ◽  
Southern Annular Mode ◽  
Enso Events ◽  
Intercomparison Project ◽  
Wave Trains ◽  
Induced Signal ◽  
The Impact ◽  
The Relationship

Abstract Simulations of individual global climate drivers using models from the Coupled Model Intercomparison Project phase 3(CMIP3) have been examined; however, the relationship among them has not been assessed. This is carried out to address several important issues, including the likelihood of the southern annular mode (SAM) forcing Indian Ocean dipole (IOD) events and the possible impact of the IOD on El Niño–Southern Oscillation (ENSO) events. Several conclusions emerge from statistics based on multimodel outputs. First, ENSO signals project strongly onto the SAM, although ENSO-forced signals tend to peak before ENSO. This feature is similar to the situation associated with the IOD. The IOD-induced signal over southern Australia, through stationary equivalent Rossby barotropic wave trains, peak before the IOD itself. Second, there is no control by the SAM on the IOD, in contrast to what has been suggested previously. Indeed, no model produces a SAM–IOD relationship that supports a positive (negative) SAM driving a positive (negative) IOD event. This is the case even in models that do not simulate a statistically significant relationship between ENSO and the IOD. Third, the IOD does have an impact on ENSO. The relationship between ENSO and the IOD in the majority of models is far weaker than the observed. However, the ENSO’s influence on the IOD is boosted by a spurious oceanic teleconnection, whereby ENSO discharge–recharge signals transmit to the Sumatra–Java coast, generating thermocline anomalies and changing IOD properties. Without the spurious oceanic teleconnection, the influence of the IOD on ENSO is comparable to the impact of ENSO on the IOD. Other model deficiencies are discussed.

Hereditary Tenancy and Corporate Landlordism in Traditional China: A Case Study

1977 ◽  
Vol 11 (2) ◽  
pp. 161-182 ◽  
Author(s):  
James L. Watson
Keyword(s):  
Twentieth Century ◽  
Land Reform ◽  
Balance Of Power ◽  
High Rate ◽  
Asian Studies ◽  
Southeastern China ◽  
The Relationship ◽  
Intense Debate

After half a century of intense debate, landlordism in traditional China continues to be one of the most controversial subjects in Asian Studies circles. The earlier literature on this topic tends to be contradictory and, at times, highly polemical. Two loosely defined schools of thought have emerged since the 1930s: (A) those scholars who argue that landlord-tenant relations were primarily exploitative with the balance of power passing increasingly to urban-based absentee landlords, and (B) those who maintain that a high rate of tenancy is not particularly unique to the twentieth century and that the relationship between landlord and tenant was not uniformly exploitative. The present paper does not fit neatly into either school, although specific elements of the following argument can be isolated to support opposing sides of the debate. I intend to explore one form of traditional Chinese tenancy, known in the literature as ‘hereditary’ or ‘permanent’ tenancy, which was common throughout many parts of Southeastern China until the Communist land reform campaigns of the early 1950s. The tenants were hereditary in the sense that the usufruct passed patrilineally from father to son while the actual title to the land remained in the hands of powerful lineage corporations. The tenants lived in satellite villages near the landlords' communities and were overshadowed in every way by their dominant neighbors.

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