scholarly journals Mexico City basin wind circulation during the MCMA-2003 field campaign

2005 ◽  
Vol 5 (3) ◽  
pp. 2503-2558 ◽  
Author(s):  
B. de Foy ◽  
E. Caetano ◽  
V. Magaña ◽  
A. Zitácuaro ◽  
B. Cárdenas ◽  
...  
Keyword(s):  
Mexico City ◽  
Atmospheric Chemistry ◽  
Regional Scale ◽  
The South ◽  
Cold Surge ◽  
Field Campaign ◽  
The North ◽  
Wind Circulation ◽  
Stable Conditions ◽  
The City

Abstract. MCMA-2003 was a major field campaign investigating the atmospheric chemistry of the Mexico City Metropolitan Area (MCMA) in April of 2003. This paper describes the wind circulation patterns during the campaign both within the Mexico City basin and on the regional scale. ''Time roses'' are introduced to concisely analyze the diurnal wind patterns. Three episode types were identified that explain the conditions encountered: ''O3-South'', ''Cold Surge'' and ''O3-North''. These can be diagnosed from a combination of synoptic and basin observations based on whether the day was predominantly cloudy, or whether the O3 peak was in the north or south of the basin. O3-South days have weak synoptic forcing due to an anti-cyclone over the eastern Pacific. Strong solar heating leads to northerly flows in the basin and an evening shift due to a gap flow from the south-east. Peak ozone concentrations are in the convergence zone in the south of the city. Cold Surge days are associated with ''El Norte'' events, with strong surface northerlies bringing cold moist air and rain. Stable conditions lead to high concentrations of primary pollutants and peak ozone in the city center. O3-North days occur when the sub-tropical jet is closer to Mexico City. With strong westerlies aloft, the circulation pattern is the same as O3-South days except for a wind shift in the mid-afternoon leading to ozone peaks in the north of the city. This classification is proposed as a means of understanding pollutant transport in the Mexico City basin and as a basis for future meteorological and chemical analysis. Furthermore, model evaluation and design of policy recommendations will need to take into account the three episode types.

scholarly journals Mexico City basin wind circulation during the MCMA-2003 field campaign

2005 ◽  
Vol 5 (8) ◽  
pp. 2267-2288 ◽  
Author(s):  
B. de Foy ◽  
E. Caetano ◽  
V. Magaña ◽  
A. Zitácuaro ◽  
B. Cárdenas ◽  
...  
Keyword(s):  
Mexico City ◽  
Atmospheric Chemistry ◽  
Regional Scale ◽  
The South ◽  
Cold Surge ◽  
Field Campaign ◽  
The North ◽  
Wind Circulation ◽  
Stable Conditions ◽  
The City

Abstract. MCMA-2003 was a major field campaign investigating the atmospheric chemistry of the Mexico City Metropolitan Area (MCMA) in April of 2003. This paper describes the wind circulation patterns during the campaign both within the Mexico City basin and on the regional scale. ''Time roses'' are introduced to concisely analyze the diurnal wind patterns. Three episode types were identified that explain the conditions encountered: ''O3-South'', ''Cold Surge'' and ''O3-North''. These can be diagnosed from a combination of synoptic and basin observations based on whether the day was predominantly cloudy, or whether the O3 peak was in the north or south of the basin. O3-South days have weak synoptic forcing due to an anti-cyclone over the eastern Pacific. Strong solar heating leads to northerly flows in the basin and an evening shift due to a gap flow from the south-east. Peak ozone concentrations are in the convergence zone in the south of the city. Cold Surge days are associated with ''El Norte'' events, with strong surface northerlies bringing cold moist air and rain. Stable conditions lead to high concentrations of primary pollutants and peak ozone in the city center. O3-North days occur when the sub-tropical jet is closer to Mexico City. With strong westerlies aloft, the circulation pattern is the same as O3-South days except for a wind shift in the mid-afternoon leading to ozone peaks in the north of the city. This classification is proposed as a means of understanding pollutant transport in the Mexico City basin and as a basis for future meteorological and chemical analysis. Furthermore, model evaluation and design of policy recommendations will need to take into account the three episode types.

scholarly journals Influence of the North Atlantic oscillation on the atmospheric levels of benzo[a]pyrene over Europe

2021 ◽  
Author(s):  
Pedro Jiménez-Guerrero ◽  
Nuno Ratola
Keyword(s):  
Spatial Pattern ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Transport Model ◽  
Regional Scale ◽  
The South ◽  
Climatic Fluctuations ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

AbstractThe atmospheric concentration of persistent organic pollutants (and of polycyclic aromatic hydrocarbons, PAHs, in particular) is closely related to climate change and climatic fluctuations, which are likely to influence contaminant’s transport pathways and transfer processes. Predicting how climate variability alters PAHs concentrations in the atmosphere still poses an exceptional challenge. In this sense, the main objective of this contribution is to assess the relationship between the North Atlantic Oscillation (NAO) index and the mean concentration of benzo[a]pyrene (BaP, the most studied PAH congener) in a domain covering Europe, with an emphasis on the effect of regional-scale processes. A numerical simulation for a present climate period of 30 years was performed using a regional chemistry transport model with a 25 km spatial resolution (horizontal), higher than those commonly applied. The results show an important seasonal behaviour, with a remarkable spatial pattern of difference between the north and the south of the domain. In winter, higher BaP ground levels are found during the NAO+ phase for the Mediterranean basin, while the spatial pattern of this feature (higher BaP levels during NAO+ phases) moves northwards in summer. These results show deviations up to and sometimes over 100% in the BaP mean concentrations, but statistically significant signals (p<0.1) of lower changes (20–40% variations in the signal) are found for the north of the domain in winter and for the south in summer.

scholarly journals Effect of daily periodic human movement on dengue dynamics: the case of the 2010 outbreak in Hermosillo, Mexico

2020 ◽  
Author(s):  
Mayra R. Tocto-Erazo ◽  
Daniel Olmos-Liceaga ◽  
José A. Montoya
Keyword(s):  
Real Data ◽  
Human Movement ◽  
Basic Reproductive Number ◽  
Reproductive Number ◽  
The South ◽  
South Side ◽  
Transmission Rates ◽  
The North ◽  
Local Properties ◽  
The City

AbstractThe human movement plays an important rol in the spread of infectious diseases. On an urban scale, people move daily to workplaces, schools, among others. Here, we are interested in exploring the effect of the daily local stay on the variations of some characteristics of dengue dynamics such as the transmission rates and local basic reproductive numbers. For this, we use a two-patch mathematical model that explicitly considers that daily mobility of people and real data from the 2010 dengue outbreak in Hermosillo, Mexico. Based on a preliminary cluster analysis, we divide the city into two regions, the south and north sides, which determine each patch of the model. We use a Bayesian approach to estimate the transmission rates and local basic reproductive numbers of some urban mobility scenarios where residents of each patch spend daily the 100% (no human movement between patches), 75% and 50% of their day at their place of residence. For the north side, estimates of transmission rates do not vary and it is more likely that the local basic reproductive number to be greater than one for all three different scenarios. On the contrary, tranmission rates of the south side have more weight in lower values when consider the human movement between patches compared to the uncoupled case. In fact, local basic reproductive numbers less than 1 are not negligible for the south side. If information about commuting is known, this work might be useful to obtain better estimates of some contagion local properties of a patch, such as the basic reproductive number.

scholarly journals A Study on Urban Furniture: Nicosia Old City

2019 ◽  
Vol 8 (2) ◽  
pp. 1
Author(s):  
Mine Kuset Bolkaner ◽  
Selda İnançoğlu ◽  
Buket Asilsoy
Keyword(s):  
Urban Space ◽  
Urban Life ◽  
The South ◽  
Urban Identity ◽  
South Side ◽  
The North ◽  
North Side ◽  
Old City ◽  
Street Furniture ◽  
The City

Urban furniture can be defined as aesthetics and comfort elements that reflect the identity of a city and enable the urban space to become livable. Urban furniture is an important element of the city in order to improve the quality of urban life, to create a comfortable and reliable environment and to meet the needs of the users in the best way. For designing these elements, the social, economic, cultural and architectural structure of the city should be considered and evaluated. It is important to adapt the urban furniture to the urban texture and to the cultural structure achieving an urban identity, in order to ensure the survival and sustainability of the historical environments. In this study, a study was carried out in the context of urban furniture in Nicosia Walled City, which has many architectural cultures with its historical texture. In this context, firstly the concept of urban identity and urban furniture was explained and then, information about urban furniture was given in historical circles with urban furniture samples from different countries. As a field study, a main axis was determined and the streets and squares on this axis were discussed. These areas have been explored starting from Kyrenia Gate in North Nicosia; İnönü Square, Girne Street, Atatürk Square, Arasta Square, Lokmacı Barricade and on the south side Ledra Street and Eleftherias Square. In this context, the existing furniture in the North and South were determined and evaluated in terms of urban identity accordingly. As a result, it can be suggested that the existing street furniture equipments, especially on the north side, do not have any characteristic to emphasize the urban identity. According to the findings, it was determined that the urban furniture in the streets and squares on the north side is generally older and neglected, and does not provide a unity with the environment, whereas on the south side, these elements on the street and square are relatively new, functional and environmentally compatible.Key words: urban furniture, historical environment, urban identity, Nicosia Old City

Al-Makrīzī’s Khitat and the Markets in Cairo during the Mamlūks Era

Belleten ◽  
2017 ◽  
Vol 81 (291) ◽  
pp. 329-372
Author(s):  
Abdullah Mesut Ağır
Keyword(s):  
The South ◽  
Domestic Markets ◽  
The North ◽  
15Th Century ◽  
The City

This study examines the markets in Cairo during the reign of the Mamlūks in the light of al-Makrīzī's Chronicle al-Khitat. Besides those which were built during the Mamlūks era the commercial life were ongoing at the markets dating back to the Fatimids and the Ayyubids periods. The marketplaces generally occupied in al-Qasaba which was between Bāb al-Futūh in the north and Bāb al-Zuwayla in the south was the trading center of the city. Al-Qasaba is al-Mu'izz Street today which takes its name from the Fatimid Caliph al-Mu'izz li-Dinillah (341-364/953-975). The economic and social decline especially seen during the second half of the Mamlūks in the 15th century affected also the domestic markets stability and most of the sûqs disappeared depending on these conditions.

The Grey Wolf

Antiquity ◽  
1943 ◽  
Vol 17 (65) ◽  
pp. 11-18 ◽  
Author(s):  
Colin Matheson
Keyword(s):  
17Th Century ◽  
Grey Wolf ◽  
The South ◽  
The North ◽  
The City ◽  
Close Investigation ◽  
Animal World

In a previous paper (1) an attempt was made to describe the inter-relations of man and bear in Europe from early times to the present day. In many ways the influence of the wolf has been more important than that of the bear on the habits and thoughts of European man. Occasionally it has figured in a favourable light, as in the case of the she-wolf credited with suckling the twin founders of the City on Seven Hills (though even here the double meaning of lupa—applied in a transferative sense to ladies whose character would not bear close investigation—has led some authors to a conjecture which it might not have been politic to mention to any patriotic inhabitant of the grandeur that was Rome). But in general, whether in Italy or elsewhere, no animal has been so hated and feared. Among the ancient Greeks in the south—whose Lyceum at Athens and sanctuary of Apollo Lukeios at Sicyon may have originated in efforts to propitiate the wolves-as among the Letts of the north who, perhaps as late as the 17th century, sacrificed a goat each December to the wolves so that their other livestock might be spared(2) ; from Scotland where priests offered the prayer, quoted by Fittis (3) from the old Litany of Dunkeld, for deliverance ‘from robbers and caterans, from wolves and all wild beasts’, to Russia where peasants pronounced a spell on St. George's Day with the recurring plea, ‘God grant the wolf may not take our cattle‘ (4); the wolf was the great destroyer, the despoiler of flocks and herds and man's chief enemy in the animal world.

A Road Trip with Strabo

Mnemosyne ◽  
2016 ◽  
Vol 69 (2) ◽  
pp. 202-225
Author(s):  
Sarah Pothecary
Keyword(s):  
The South ◽  
Road Trip ◽  
Euphrates River ◽  
The Road ◽  
The North ◽  
South West ◽  
Explicit Reference ◽  
The City

A number of places that feature in Strabo’s description of the Asian peninsula were situated on the ancient road that ran between the Euphrates river and the city of Ephesus. It is likely that Strabo journeyed along the entire thousand-kilometre length of the road, even though he makes explicit reference to his presence in only a few locations. He most probably made the journey as a youth on his way to Roman Asia, in the south west of the peninsula, from Pontus in the north. Decades pass before Strabo, as an old man, writes the Geography and includes in it the memories of places he had visited. The outdated tone of some of his descriptions reflects this passage of time.

Tell el-Amarna, Spring 2017

2017 ◽  
Vol 103 (2) ◽  
pp. 137-151
Author(s):  
Barry Kemp
Keyword(s):  
Labour Force ◽  
The South ◽  
Initial Field ◽  
The North ◽  
Excavation Work ◽  
Field Season ◽  
The City

The spring 2017 season at Amarna focused on excavation at the large pit-grave cemetery adjacent to the North Tombs, the results of which support the suggestion, made after an initial field season in 2015, that this is a cemetery for a labour force involved in building and maintaining the city of Akhetaten. Post-excavation work was also undertaken on pottery from the Stone Village, reliefwork from Kom el-Nana and a new study of burial textiles from the South Tombs Cemetery.

Excavations at Carthage 1974: First Interim Report

1975 ◽  
Vol 55 (1) ◽  
pp. 11-40 ◽  
Author(s):  
Henry Hurst
Keyword(s):  
Second Temple ◽  
Fifth Century ◽  
Sixth Century ◽  
Interim Report ◽  
The South ◽  
City Wall ◽  
North Shore ◽  
The North ◽  
The City ◽  
Harbour Area

SummaryIn the first season of excavation by a British team participating in the UNESCO Save Carthage Project, two sites in the harbour area and one inland were examined. On the site on the island in the circular harbour, the remains probably of the νεώρια described by Appian succeeded earlier Punic occupation periods and were in turn followed by two successive Roman temples and a building, probably a pharos, associated with the second temple. After this, there appears to have been domestic or commercial occupation in the fifth and sixth centuries A.D. On the north shore of the circular harbour, remains of the late Roman quayside and associated streets and buildings were found. On the inland site, situated to the south of the Roman street grid, there were the remains of third–fifth-century and fifth–sixth-century buildings fronting a street and backed by a substantial wall identified as the city wall constructed in the reign of Theodosius II.

scholarly journals First Results and Perspectives of a New Archaeological Project in the Armenian Capital Artaxata: From Artashes-Artaxias I to Roman Imperialism

Electrum ◽  
2021 ◽  
Vol 28 ◽  
pp. 245-276
Author(s):  
Achim Lichtenberger ◽  
Torben Schreiber ◽  
Mkrtich H. Zardaryan
Keyword(s):  
The South ◽  
Roman Imperialism ◽  
The North ◽  
Exact Function ◽  
First Results ◽  
Archaeological Project ◽  
Two Phases ◽  
Roman Province ◽  
The City ◽  
Three Phases

The paper deals with the first results of the Armenian-German Artaxata Project which was initiated in 2018. The city of Artaxata was founded in the 2nd century BC as the capital of the Artaxiad kingdom. The city stretches over the 13 hills of the Khor Virap heights and the adjacent plain in the Ararat valley. The new project focusses on Hill XIII and the Lower city to the south and the north of it. This area was investigated by magnetic prospections in 2018 and on the basis of its results, in total eleven 5 × 5 m trenches were excavated in 2019. On the eastern part of Hill XIII several structures of possibly domestic function were uncovered. They were laid out according to a regular plan and in total three phases could be determined. According to 14C data, the first phase already dates to the 2nd century BC while the subsequent two phases continue into the 1st/2nd century AD. In the 2019 campaign, the overall layout and exact function of the structures could not be determined and more excavations will be undertaken in the forthcoming years. North of Hill XIII the foundations of piers of an unfinished Roman aqueduct on arches were excavated. This aqueduct is attributed to the period 114–117 AD when Rome in vain tried to establish the Roman province of Armenia with Artaxata being the capital.

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