Operational forecasting in the Aegean Sea: The POSEIDON system

Author(s):  
K. Nittis ◽  
T. Soukissian ◽  
G. Chronis
2010 ◽  
Vol 23 ◽  
pp. 25-30 ◽  
Author(s):  
P. Louka ◽  
D. Boucouvala ◽  
F. Gofa ◽  
M. Balami ◽  
D. Ziakopoulos

Abstract. A case of an intense snowfall in the Greater Athens Area (GAA) between 16 and 18 February 2008 is investigated. The physical processes that forced the snowfall event are identified and analysed. The main factor causing the event at its start was the entrainment of arctic air masses from North-Eastern Europe. At a second stage, the Aegean Sea acted as the Great Lakes of Canada and North-East USA and in association with the existing extremely cold air masses aloft and the enrichment of the air with humidity and heat led to the enhancement of the snowfall in the GAA. In the final stage of the event, the local meteorological conditions associated with the topography of the area resulted in the occurrence of very intense snowfall event on the leeward side of the GAA. The available operational observations and forecast tools were used for accurately predicting the intensity, duration and evolution of the event.


2020 ◽  
pp. 046
Author(s):  
Thierry Bergot ◽  
Pierre Bessemoulin ◽  
Claire Sarrat

La synergie entre campagnes de mesures et modélisation numérique a permis de faire fortement progresser notre compréhension des interactions sol-végétation-atmosphère. Ces progrès ont conduit à l'élaboration du modèle de surface Isba développé par Joël Noilhan et utilisé aujourd'hui encore dans les modèles de prévision opérationnelle de Météo-France. Cet article vise à illustrer l'apport des campagnes de mesures dans l'amélioration de nos connaissances des processus en surface à travers trois exemples, Hapex-Mobilhy pour l'étude du bilan hydrique, Carbo-Europe pour l'étude du bilan en carbone et l'étude du brouillard sur l'aéroport Paris-CdG pour l'influence des conditions de surface sur les nuages bas. The synergy between field experiments and numerical modeling has allowed to significantly advance our understanding of soil-vegetation-atmosphere interactions. This progress led to the ISBA surface model developed by Joël Noilhan and used today in Météo-France's operational forecasting models. This article aims to illustrate the contribution of field experiments in improving our knowledge of surface processes through three examples: Hapex-Mobilhy, Carbo-Europe, and the study of fog at Paris-CdG airport.


Author(s):  
Nikolay Esin ◽  
Nikolay Esin ◽  
Vladimir Ocherednik ◽  
Vladimir Ocherednik

A mathematical model describing the change in the Black Sea level depending on the Aegean Sea level changes is presented in the article. Calculations have shown that the level of the Black Sea has been repeating the course of the Aegean Sea level for the last at least 6,000 years. And the level of the Black Sea above the Aegean Sea level in the tens of centimeters for this period of time.


2007 ◽  
Vol 7 (1) ◽  
pp. 253-260 ◽  
Author(s):  
T. Theodoulou ◽  
C. Memos

Limenoscope is a web based database aiming at promoting the cultural heritage regarding ancient Greek harbours and disseminate the relevant information equally to the general public and to researchers with an interest in that particular cognitive field. The scope of the project is the realization of a database, where one can search for concise information relevant to the historical role, the topography, the morphology, as well as the technical works and installations of ancient harbours in the Mediterranean and the Black Sea. The Database started off with the registration of harbours located in the Aegean Sea and Cyprus, dating from Archaic to Byzantine times. Special emphasis is laid on the bibliographical update of the data forms of the harbour sites, as well as on the related references in ancient literature. The database enables the locating of these sites on a general map, where photographs, plans etc. are also archived. The principles of the database structure are briefly presented along with an example, that of the harbour of Phalasarna, among the harbours registered therein.


Author(s):  
Gozde Guney Dogan ◽  
Ahmet Cevdet Yalciner ◽  
Yalcin Yuksel ◽  
Ergin Ulutaş ◽  
Orhan Polat ◽  
...  
Keyword(s):  

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 102
Author(s):  
Paraskevi Nomikou ◽  
Dimitris Evangelidis ◽  
Dimitrios Papanikolaou ◽  
Danai Lampridou ◽  
Dimitris Litsas ◽  
...  

On 30 October 2020, a strong earthquake of magnitude 7.0 occurred north of Samos Island at the Eastern Aegean Sea, whose earthquake mechanism corresponds to an E-W normal fault dipping to the north. During the aftershock period in December 2020, a hydrographic survey off the northern coastal margin of Samos Island was conducted onboard R/V NAFTILOS. The result was a detailed bathymetric map with 15 m grid interval and 50 m isobaths and a morphological slope map. The morphotectonic analysis showed the E-W fault zone running along the coastal zone with 30–50° of slope, forming a half-graben structure. Numerous landslides and canyons trending N-S, transversal to the main direction of the Samos coastline, are observed between 600 and 100 m water depth. The ENE-WSW oriented western Samos coastline forms the SE margin of the neighboring deeper Ikaria Basin. A hummocky relief was detected at the eastern margin of Samos Basin probably representing volcanic rocks. The active tectonics characterized by N-S extension is very different from the Neogene tectonics of Samos Island characterized by NE-SW compression. The mainshock and most of the aftershocks of the October 2020 seismic activity occur on the prolongation of the north dipping E-W fault zone at about 12 km depth.


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