scholarly journals The spatial pattern of selected extreme precipitation indices for Turkey (1975-2012)

2020 ◽  
Vol 19 (1) ◽  
pp. 19-30
Author(s):  
Faize Sarış

AbstractThis paper analyses extreme precipitation characteristics of Turkey based on selected WMO climate change indices. The indices – monthly total rainy days (RDays); monthly maximum 1-day precipitation (Rx1day); simple precipitation intensity index (SDII); and monthly count of days when total precipitation (represented by PRCP) exceeds 10 mm (R10mm) – were calculated for 98 stations for the 38-year overlapping period (1975–2012). Cluster analysis was applied to evaluate the spatial characterisation of the annual precipitation extremes. Four extreme precipitation clusters were detected. Cluster 1 corresponds spatially to Central and Eastern Anatolia and is identified with the lowest values of the indices, except rainy days. Cluster 2 is concentrated mainly on the west and south of Anatolia, and especially the coastal zone, and can be characterised with the lowest rainy days, and high and moderate values of other indices. These two clusters are the most prominent classes throughout the country, and include a total of 82 stations. Cluster 3 is clearly located in the Black Sea coastal zone in the north, and has high and moderate index values. Two stations on the north-east coast of the Black Sea region are identified as Cluster 4, which exhibits the highest values among all indices. The overall results reveal that winter months and October have the highest proportion of precipitation extremes in Turkey. The north-east part of the Black Sea region and Mediterranean coastal area from the south-west to the south-east are prone to frequent extreme precipitation events.

2021 ◽  
Vol 8 (1) ◽  
pp. 26-44
Author(s):  
Vladimir Pokalyuk ◽  
Igor Lomakin ◽  
Valentyn Verkhovtsev ◽  
Vladimir Kochelab

Modern high-precision global digital 3-d models of the relief of the continents and the ocean floor (SRTM, GEBCO) are the objective basis to clarify the structure and features of the organization of the planetary fault network of of the Black Sea region and adjacent areas of the Mediterranean mobile belt and surrounding platform areas, to find out the location of the main transregional supermegalineaments forming the deep structural-tectonic framework of the territory. A complete consistency of the structural plan of faults and fault zones within the sea areas and continental surroundings is established. The structural position of the Black Sea basin as a whole is determined by its location at the intersection area (superposition, interference) of the diagonal (subdiagonal) transcontinental tectonolinament belts: the north-west – Elba-Zagros, Caucasus-Kopetdag, and the north-east – Atlas- Black Sea. The absence of large-scale lateral displacements at the intersection nodes of differently oriented supermegalineament systems indicates the relative autonomous stationarity and inheritance of the formation of the lyneament framework during the entire Mezozoic-Cenozoic and relatively low-shear nature of its implementation. This feature of the Black Sea region structural pattern significantly limits the possibility of using neomobilistic geodynamic models to explain the history of the geological development of the region. The strict consistency and orderliness of the lineament framework can be ensured only by global planetary factors associated with the influence of the rotational regime of the Earth's shells on the stress distribution in the lithosphere.


Author(s):  
Т.В. Гиоргобиани

В статье рассмотрены условия формирования складчатой системы Большого Кавказа в альпийскую эпоху. Показано, что главная зональная линейная складчатая структура региона была сформирована на ранне- и среднеальпийской стадиях развития в результате проявления батской и пиренейской фаз складчатости. Установлено, что причиной складкообразования было активное столкновение Черноморско-Закавказского микроконтинента на юго-западе с пассивной окраиной Большого Кавказа. Определено, что позднеальпийская стадия в регионе проходила в условиях субмеридионального тангенциального давления, во время проявления плиоцен-четвертичных фаз складчатости. В это время на Большой Кавказ воздействовал не целостный Черноморско-Закавказский микроконтинент, а слагающие его мелкие плиты и блоки-шоли. Выяснено, что они в процессе тектогенеза перемещались и косо вдвигались в складчатую систему Большого Кавказа, вызывая преобразование первичной структуры и возникновение интерференционной складчатости. В результате повторного деформирования отдельных участков региона в его пределах образовалась неоднородная складчатая структура. Изучена основная особенность складчатой системы Большого Кавказа, выраженная структурной неоднородностью складчатости в поперечном и продольном направлениях. Установлено, что она отражает поэтапную и разноплановую деформацию отдельных участков, возникающую в результате последовательного проявления в регионе локальной и региональной геодинамики микроконтинента, а также связанных с ними общих и частных механизмов его формирования. Структурный анализ морфологии складчатости БК действительно показал неравномерную дислоцированность его – С-З и Ю-В сегментов, сложенных в основном ранне- и среднеальпийскими структурами, выраженную в разной степени осложненности коллизионными деформациями. Так, в пределах мальм-эоценового структурного этажа С-З Кавказа, раннеальпийская структура которого меньше всех остальных сегментов усложнена коллизионными деформациями, четко проявлена латеральная асимметричная зональность его складчатой структуры.  Она выражена в последовательной смене с юго-запада на северо-восток интенсивной линейной сильно сжатой складчатости линейными гребневидными, а затем слабо вытянутыми типичными брахиморфными складками, переходящими, в свою очередь, в полого наклонную на северо-восток моноклиналь The article considers the conditions of formation of folded system of the Greater Caucasus in the Alpine Epoch. It is shown that main zonal linear folded structure of the region was formed at the early and middle Alpine stages of the evolution in the result of manifestation of Bathonian and Pyrenean stages of folding. It was established that the cause of the folding was an active collision of the Black Sea-Transcaucasian microcontinent in the south-west with the passive margin of the Greater Caucasus. It was also determined that the Late Alpine stage in the region took place under the conditions ofsubmeridional tangential stress, during the Pliocene-Quarternary folding phases. During this period the Greater Caucasus was affected not by the whole Black Sea-Transcaucasian microcontinent, but by its smaller plates and blocks. It was found out that during the process of tectogenesis they drifted and obliquely moved into the folded system of the Greater Caucasus, causing the transformation of the initial structure and the occurrence of interferential folding. In the result of repeated deformation of separate areas of the region the heterogeneous folded structure was formed. The main feature of the folded structures of the Greater Caucasus (expressed by a structural heterogeny in transversal and longitudinal directions) was studied. It was determined that it reflects the gradual and diverse deformation of individual sections, resulting from the consistent manifestation of the local and regional geodynamics of the microcontinent, as well as the common and specific mechanisms of its formation associated with them. The structural analysis of the morphology of folding of the Great Caucasus really showed its uneven dislocation, i.e. the N-W and S-E of the segments, composed mainly of early and middle Alpine structures, expressed in varying degrees of complication by collisional deformations. So, within the Malm-Eocene structural floor of the northwestern Caucasus, the Early Alpine structure of which is less than all the other segments, is complicated by collimated deformations, the lateral asymmetric zonality of its folded structure is clearly manifested. It is expressed in a successive change from the south-west to the north-east of intensive linear highly compressed folding with linear ridge-like, and then slightly elongated typical brachymorphic folds, which turn into a hollow sloping to the north-east monocline


Author(s):  
V.N. Maslova ◽  
◽  
E.N. Voskresenskaya ◽  
A.V. Yurovsky ◽  
V.Yu. Zhuravsky ◽  
...  

The aim of the paper is to study the surface and mid – tropospheric synoptic fields, the location of trajectories and of the deep cyclones centers for different selected types of storm for the cases if the wave heights are of at least 5 m. The sets of cyclone parameters in the Black Sea region were analysef within the 37°-50° N, 27°-45° E. Cyclones and their main parameters were determined using 4-term NCEP / NCAR reanalysis data sets on the 1000 and 500 hPa geopotential height (GPH) in 1951-2017. Bardin’s methodology was used for calculation. Deep cyclones were identified by the criterion of exceeding the upper 75% quartile threshold of the depth (≥40 gpm) and intensity (≥16.8 gpm) of cyclones. It was done by analogy with the method used earlier by the authors to calculate extreme precipitation and statistical characteristics of storms. In addition, we used the author’s method of objective tracking using spline interpolation on the bases of sea surface pressure from the same NCEP / NCAR reanalysis. The reason to apply an additional method was the result obtained during the work realisation: about 30% of extreme storms in the region are caused by small local cyclones that occur over the Black sea. however, some of them cannot be determined using method 1 due to the coarser step of isogyps. As a result, the distribution of deep cyclone centers and their trajectories of different storm types at the Northern Black Sea coast for the cases if the wave height of at least 5 m is shown. It is found that storm types depend of synoptic field features. The centers of deep cyclones are concentrated to the North from the Black Sea coast (for Western type 1B), to the Northwest (for mixed type 2A), to the North-East (for mixed type 2B), and to the South-Eeast (for Central type 3).


Author(s):  
Paul Huddie

The year 2014 marked the 160th anniversary of the beginning of the Crimean War, 1854–6. It was during that anniversary year that the names of Crimea, Sevastopol, Simferopol and the Black Sea re-entered the lexicon of Ireland, and so did the terms ‘Russian aggression’, ‘territorial violation’ and ‘weak neighbour’. Coincidentally, those same places and terms, and the sheer extent to which they perpetuated within Irish and even world media as well as popular parlance, had not been seen nor heard since 1854. It was in that year that the British and French Empires committed themselves to war in the wider Black Sea region and beyond against the Russian Empire. The latter had demonstrated clear aggression, initially diplomatic and later military, against its perceived-to-be-weak neighbour and long-term adversary in the region, the Ottoman Empire, or Turkey. As part of that aggression Russia invaded the latter’s vassal principalities in the north-western Balkans, namely Wallachia and Moldavia (part of modern-day Romania), collectively known as the Danubian Principalities. Russia had previously taken Crimea from the Ottomans in 1783....


2018 ◽  
Vol 931 ◽  
pp. 790-796
Author(s):  
Viktoria V. Pishchulina

A one-apsidal hall church is always a reflection of so-called “vulgar” Christianity, thus revealing the important peculiarities of the spatial culture of the region where it is erected. In this region we can mark two periods when such temples were built: VI-VII c. and X-XII c. The first period is associated with the missionary activity by Byzantine Empire, Antioch, Caucasian Albania which was conditioned by both geopolitical interests (Byzantian Empire, Antioch) and the shift of The Great Silk Way to the north (Caucasian Albania). The second, as the research has shown, is connected with the migration of the peoples of Abkhazia, the abzakhs to this territory in the XII-XIII c. and the development of contacts with the Crimea. In the North Black Sea Region the one-apsidal hall church appears as early as in the VI c. – in the territory of Abkhazia we know about ten such temples. The temples of this type in the area of Big Sochi are dated back to the VII-VIII c. In the first Abhzaian temples we can reveal the influence of denominational centers – Byzantian Empire, Antioch, Caucasian Albania. In the temples of the Black Sea coast of both periods – introduction of the samples from Abkhazia.


Ocean Science ◽  
2012 ◽  
Vol 8 (2) ◽  
pp. 183-196 ◽  
Author(s):  
A. I. Kubryakov ◽  
G. K. Korotaev ◽  
V. L. Dorofeev ◽  
Y. B. Ratner ◽  
A. Palazov ◽  
...  

Abstract. The Black Sea coastal nowcasting and forecasting system was built within the framework of EU FP6 ECOOP (European COastalshelf sea OPerational observing and forecasting system) project for five regions: the south-western basin along the coasts of Bulgaria and Turkey, the north-western shelf along the Romanian and Ukrainian coasts, coastal zone around of the Crimea peninsula, the north-eastern Russian coastal zone and the coastal zone of Georgia. The system operates in the real-time mode during the ECOOP project and afterwards. The forecasts include temperature, salinity and current velocity fields. Ecosystem model operates in the off-line mode near the Crimea coast.


2012 ◽  
Vol 7 (1) ◽  
pp. 107-109
Author(s):  
Yaroslav Bilanchyn ◽  
Svetlana Rezvaya ◽  
Volodymyr Medinets

Many years’ studies of process of changes in composition, properties and fertility of the black soils of the North-Western Black Sea area in Ukraine with irrigation have revealed mobility of carbonates and humus in them, decrease of capacity of cationic consumption and content of consumed calcium, increase of share of consumed magnesium and sodium. Indicators of agro-physical state of soils under irrigation conditions are worsening significantly.


Author(s):  
Eugeny Godin ◽  
Eugeny Godin ◽  
Yury Goryachkin ◽  
Yury Goryachkin ◽  
Vyacheslav Dolotov ◽  
...  

This work is a multi-disciplinary research aimed to develop common approaches to estimating the current state and forecasting evolution of coastal geosystems. From 2010 to now, the state of coastal zone geosystems of the Crimean and Caucasian Russian coast has been studied. The research tasks are solved using up-to-date IT based integrated analysis of historical and new observational data.


Author(s):  
O. Podymov ◽  
O. Podymov ◽  
N. Kuzevanova ◽  
N. Kuzevanova ◽  
A. Khvorosch ◽  
...  

The work demonstrates the results of the 6-years complex ship-borne monitoring of coastal zone in the north-eastern part of the Black Sea, carried out by the Southern Branch of P.P.Shirshov Institute of Oceanology, RAS, on a marine cross-section at the Blue Bay (Gelendzhik) beam 1-2 times per month. Climatic changes and eutrophication exert a significant impact on the sea water at the coastal area. In case of the Black Sea these factors pile up with a permanent hydrogen sulphide contamination of the sea water below 80-200 meters depth (depending on the season and distance from the shore). Strong pycno-halocline at the depths from 70 to 160 meters, formed due to the inflow of high salinity water from the Marmara Sea, inhibits the mixing between the water layers and, as a result, also limits the oxygen transport into the deeper layers. The winter cooling reduces the pycno-halocline and enriches the top active layer, down to the cold intermediate layer (CIL), with oxygen and nutrients, which subsequently lead to a vernal phytoplankton bloom. Formation of the thermocline and upper quasi-homogeneous layer (UQL), caused by the water warming in spring, at large extent determines a thickness of phytoplankton-rich layer during the spring and summer seasons. The work demonstrates seasonal and interannual dynamics of the UQL, thermocline, CIL and hydrogen sulphide boundary position in the coastal zone of the north-eastern part of the Black Sea.


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