A study on the west Sahel rainfall variability: The role of the intertropical convergence zone (ITCZ)

2012 ◽  
Vol 7 (14) ◽  
Author(s):  
P. S. Lucio
Keyword(s):  
Rainfall Variability ◽  
Intertropical Convergence Zone ◽  
Convergence Zone ◽  
The West ◽  
Sahel Rainfall

scholarly journals Climatologia da pluviometria do município de Teresina, Piauí, Brasil

2016 ◽  
Vol 11 (4) ◽  
pp. 135
Author(s):  
Hudson Ellen Alencar Menezes ◽  
Raimundo Mainar de Medeiros ◽  
José Lucas Guilherme Santos
Keyword(s):  
Water Resources ◽  
Rainfall Variability ◽  
Intertropical Convergence Zone ◽  
Atmospheric Dynamics ◽  
Rainfall Data ◽  
Annual Rainfall ◽  
Convergence Zone ◽  
Northeast Brazil ◽  
Urban Structures ◽  
Urbanized Areas

<p>As variações nas precipitações refletem claramente a dinâmica atmosférica da região, marcada pela intensa variabilidade, onde se observa a atuação da Zona de Convergência Intertropical (ZCIT) com sua atuação entre os meses de janeiro a março, sendo esse período mais chuvoso. As variabilidades espaço temporal no comportamento das chuvas tem sido analisadas e diagnosticadas por vários autores no Nordeste do Brasil (NEB), portanto objetivou-se diagnosticar a variabilidade dos índices pluviométricos em Teresina no Estado do Piauí no período de 1913 a 2010. A análise do comportamento da precipitação nas cidades de grande e médio porte é de extrema importância para o gerenciamento dos recursos hídricos, uma vez que se trata de áreas densamente urbanizadas. Muitas vezes, sem uma estruturação urbana adequada, estas cidades se encaixam perfeitamente nesse contexto. Foram utilizados dados mensais observados e anuais de precipitação pluviométrica no período de 1913 a 2010, com 97 anos de observações. Os resultados mostraram a recorrência de valores máximos de precipitação anual dentro de um intervalo de 18, 11 e 8 anos. Na análise dos desvios-padrões, os resultados mostraram predominância dos desvios negativos em relação aos desvios positivos.</p><p align="center"><strong><em>Climatology of rainfall in the Teresina city, Piauí state, Brazil</em></strong></p><p>Variations in precipitation clearly reflect the atmospheric dynamics of the region, marked by intense variability, where we observe the performance of the Intertropical Convergence Zone (ITCZ) with his performance in the months of January-March, this being more rain tem period. The timeline of rainfall variability in behavior has been analyzed and diagnosed by several authors in Northeast Brazil (NEB), so let's study this variability between the periods 1913 to 2010 of Teresina city.  The behavior of rainfall in cities large and medium sized is of utmost importance to the managerial of water resources, since it is densely urbanized areas. Often without adequate urban structures these cities fit perfectly in this context. We used observed monthly and annual rainfall data for the period 1913-2010, 97 years of observations. The results showed recurrence of maximum values of annual precipitation an interval of 18, 11 and 8 years. In the analysis of standard deviations, the results showed a predominance of negative deviations from the positive deviations.<strong></strong></p><p align="center"><strong><em><br /></em></strong></p>

scholarly journals Interdecadal Changes in the Leading Ocean Forcing of Sahelian Rainfall Interannual Variability: Atmospheric Dynamics and Role of Multidecadal SST Background

2018 ◽  
Vol 31 (17) ◽  
pp. 6687-6710 ◽  
Author(s):  
Roberto Suárez-Moreno ◽  
Belén Rodríguez-Fonseca ◽  
Jesús A. Barroso ◽  
Andreas H. Fink
Keyword(s):  
Southern Oscillation ◽  
Rainfall Variability ◽  
Summer Rainfall ◽  
Rain Gauge ◽  
Sst Variability ◽  
Cold Events ◽  
Sahel Rainfall ◽  
West African Sahel ◽  
First Time

The atmospheric response to global sea surface temperatures is the leading cause of rainfall variability in the West African Sahel. On interannual periodicities, El Niño–Southern Oscillation, the Atlantic equatorial mode, and Mediterranean warm/cold events primarily drive variations of summer rainfall over the Sahel. Nevertheless, the rainfall response to these modes of interannual SST variability has been suggested to be unstable throughout the observational record. This study explores changes in the leading patterns of covariability between Sahel rainfall and SSTs, analyzing the dynamical mechanisms at work to explain the nonstationary relationship between anomalies in these two fields. A new network of rain gauge stations across West Africa is used for the first time to investigate these instabilities during the period 1921–2010. A hypothesis is raised that the underlying SST background seems to favor some interannual teleconnections and inhibit others in terms of the cross-equatorial SST gradients and associated impacts on the location of the intertropical convergence zone. Results of this study are relevant for improving the seasonal predictability of summer rainfall in the Sahel.

scholarly journals The Role of the Sahara Low in Summertime Sahel Rainfall Variability and Change in the CMIP3 Models

2009 ◽  
Vol 22 (21) ◽  
pp. 5755-5771 ◽  
Author(s):  
M. Biasutti ◽  
A. H. Sobel ◽  
Suzana J. Camargo
Keyword(s):  
North Atlantic ◽  
Rainfall Variability ◽  
Coupled Model ◽  
First Century ◽  
African Region ◽  
Low Level ◽  
The North ◽  
Sahel Rainfall ◽  
Intercomparison Project

Abstract Projections for twenty-first-century changes in summertime Sahel precipitation differ greatly across models in the third Coupled Model Intercomparison Project (CMIP3) dataset and cannot be explained solely in terms of discrepancies in the projected anomalies in global SST. This study shows that an index describing the low-level circulation in the North Atlantic–African region, namely, the strength of the low-level Saharan low, correlates with Sahel rainfall in all models and at the time scales of both interannual and interdecadal natural variability and of the forced centennial trend. An analysis of Sahel interannual variability provides evidence that variations in the Sahara low can be a cause, not just a consequence, of variations in Sahel rainfall and suggests that a better understanding of the sources of model discrepancy in Sahel rainfall predictions might be gained from an analysis of the mechanisms influencing changes in the Sahara low.

scholarly journals The Role of the Cloud Radiative Effect in the Sensitivity of the Intertropical Convergence Zone to Convective Mixing

2018 ◽  
Vol 31 (17) ◽  
pp. 6821-6838 ◽  
Author(s):  
Joshua Talib ◽  
Steven J. Woolnough ◽  
Nicholas P. Klingaman ◽  
Christopher E. Holloway
Keyword(s):  
Energy Transport ◽  
Hadley Circulation ◽  
Intertropical Convergence Zone ◽  
Convergence Zone ◽  
Convective Mixing ◽  
Surface Latent Heat Flux ◽  
Mixing Rates ◽  
Cloud Radiative Effects ◽  
Static Energy

Studies have shown that the location and structure of the simulated intertropical convergence zone (ITCZ) is sensitive to the treatment of sub-gridscale convection and cloud–radiation interactions. This sensitivity remains in idealized aquaplanet experiments with fixed surface temperatures. However, studies have not considered the role of cloud-radiative effects (CRE; atmospheric heating due to cloud–radiation interactions) in the sensitivity of the ITCZ to the treatment of convection. We use an atmospheric energy input (AEI) framework to explore how the CRE modulates the sensitivity of the ITCZ to convective mixing in aquaplanet simulations. Simulations show a sensitivity of the ITCZ to convective mixing, with stronger convective mixing favoring a single ITCZ. For simulations with a single ITCZ, the CRE maintains the positive equatorial AEI. To explore the role of the CRE further, we prescribe the CRE as either zero or a meridionally and diurnally varying climatology. Removing the CRE is associated with a reduced equatorial AEI and an increase in the range of convective mixing rates that produce a double ITCZ. Prescribing the CRE reduces the sensitivity of the ITCZ to convective mixing by 50%. In prescribed-CRE simulations, other AEI components, in particular the surface latent heat flux, modulate the sensitivity of the AEI to convective mixing. Analysis of the meridional moist static energy transport shows that a shallower Hadley circulation can produce an equatorward energy transport at low latitudes even with equatorial ascent.

Economic and Legal Support for Commercialization of Intellectual Property in Russia

2003 ◽  
pp. 66-76
Author(s):  
I. Dezhina ◽  
I. Leonov
Keyword(s):  
Intellectual Property ◽  
The State ◽  
Commercial Application ◽  
The West ◽  
Role Of The State ◽  
Legal Context

The article is devoted to the analysis of the changes in economic and legal context for commercial application of intellectual property created under federal budgetary financing. Special attention is given to the role of the state and to comparison of key elements of mechanisms for commercial application of intellectual property that are currently under implementation in Russia and in the West. A number of practical suggestions are presented aimed at improving government stimuli to commercialization of intellectual property created at budgetary expense.

Magistri Legis. Eine Studie zur dogmatischen Funktion im industriellen System

2011 ◽  
Vol 2 (2) ◽  
pp. 69-112
Author(s):  
Pierre Legendre
Keyword(s):  
Social Function ◽  
Modern Human ◽  
Human Behaviour ◽  
Cultural Reproduction ◽  
Industrial System ◽  
The West ◽  
History Of ◽  
History Of Law ◽  
New Look

"Der Beitrag reevaluiert die «dogmatische Funktion», eine soziale Funktion, die mit biologischer und kultureller Reproduktion und folglich der Reproduktion des industriellen Systems zusammenhängt. Indem sie sich auf der Grenze zwischen Anthropologie und Rechtsgeschichte des Westens situiert, nimmt die Studie die psychoanalytische Frage nach der Rolle des Rechts im Verhalten des modernen Menschen erneut in den Blick. </br></br>This article reappraises the dogmatic function, a social function related to biological and cultural reproduction and consequently to the reproduction of the industrial system itself. On the borderline of anthropology and of the history of law – applied to the West – this study takes a new look at the question raised by psychoanalysis concerning the role of law in modern human behaviour. "

Introduction

2017 ◽  
Author(s):  
George Hoffmann
Keyword(s):  
Chief Editor ◽  
City Council ◽  
The West ◽  
Son Of God ◽  
Warm Summer ◽  
The City

On a warm summer afternoon in 1561, Calvin’s chief editor donned a heavy stole, thick robes, and a gleaming tiara and proceeded to strut and fret his hour upon the stage in a comedy of his own devising. For little more than a century, Christians in the West had celebrated on August 6th Christ’s Transfiguration as the son of God in shining robes. But on this Sunday in Geneva, the city council, consistory, and an audience fresh from having attended edifying sermons at morning service gathered to applaud the transfiguration of the learned Conrad Badius into the title role of ...

Levantine Art in the “Orientalizing” Period

2019 ◽  
pp. 369-383
Author(s):  
Marian H. Feldman
Keyword(s):  
Twentieth Century ◽  
Cultural Relations ◽  
Ancient Greek ◽  
The West ◽  
False Dichotomy ◽  
First Millennium

The “Orientalizing period” represents a scholarly designation used to describe the eighth and seventh centuries bce when regions in Greece, Italy, and farther west witnessed a flourishing of arts and cultures attributed to contact with cultural areas to the east—in particular that of the Phoenicians. This chapter surveys Orientalizing as an intellectual and historiographic concept and reconsiders the role of purportedly Phoenician arts within the existing scholarly narratives. The Orientalizing period should be understood as a construct of nineteenth- and twentieth-century scholarship that was structured around a false dichotomy between the Orient (the East) and the West. The designation “Phoenician” has a similarly complex historiographic past rooted in ancient Greek stereotyping that has profoundly shaped modern scholarly interpretations. This chapter argues that the luxury arts most often credited as agents of Orientalization—most prominent among them being carved ivories, decorated metal bowls, and engraved tridacna shells—cannot be exclusively associated with a Phoenician cultural origin, thus calling into question the primacy of the Phoenicians in Orientalizing processes. Each of these types of objects appears to have a much broader production sphere than is indicated by the attribute as Phoenician. In addition, the notion of unidirectional influences flowing from east to west is challenged, and instead concepts of connectivity and networking are proposed as more useful frameworks for approaching the problem of cultural relations during the early part of the first millennium bce.

scholarly journals TANIAN LANJANG Pola Tata Ruang dan Kekerabatan Masyarakat Madura

2017 ◽  
Vol 10 (2) ◽  
Author(s):  
Abdul Sattar
Keyword(s):  
Family Relationship ◽  
Vital Role ◽  
The West ◽  
Architectural Pattern ◽  
The Third ◽  
House Building

This study is intended to describe the meaning of the architectural pattern and family relationship among Madurese society. There are three points that will be discussed in this article. The first, the meaning behind Madurese choice in building their home in tanian lanjang. The second, the vital role of kobhung on the pattern of tanian lanjang. The third, the metamorphosis of tanian lanjang: changable and unchangable pattern. To describe all of these aspects and to know what is really meant by Madurese society, it is extremely needed to be part of this society; living with them for a temporal time is a must. The result of this research consists of three important points. The first, the meaning of house building in tanian lanjang is to present the seniority of the inhabitants. The oldest always stays in the west position and the youngest always stay in the east position. A house also becomes a private place for women and kids. Women are also the inhabitants and the owners of houses. The second, kobhung has a vital role in tanian lanjang. It is used to become the centre of all activities done by men. The third, the existence of tongghuh and kobhung is one of unchangable pattern of tanian lanjang.

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