Recent studies have demonstrated a link between ozone changes caused by human activities and changing UV levels at the Earth's surface, as well as a link to climate through changes in radiative forcing and links to changes in chemical composition. This book draws together key scientists who provide state of the art contributions on the variable ozone layer and the interplay of longwave and shortwave radiative interactions which link ozone, the climate and UV issues.

Following the rapid developments in the UV-B measurement techniques and the rapidly growing research in the field in the late 80's and early 90's, we organized a large gathering of distinguished experts in a NATO Advanced Study Institute, held in Halkidiki, Greece on October, 2-11. 1995. The Institute was organized so as to include state of the art lectures on most aspects of solar ultraviolet radiation and its effects. This was achieved by extended lectures and discussions given in five sessions by 27 lecturers and a demonstration of filed measurements and calibration techniques at the end of the Institute. The ASI began with the sun and fundamentals on solar radiative emissions and their variability in time and continued with the interaction of solar Ultraviolet with the atmosphere through the complex scattering processes and photochemical reactions involved. Particular emphasis was given to changes in atmospheric composition imposed by different manifestations of the solar activity cycle. as well as on the modelling of radiative transfer through the atmosphere and the ocean under variable environmental conditions. Overviews on the ozone issue. its monitoring and variability were extensively discussed with emphasis on the observed acceleration of ozone decline in the early 90's. This acceleration had as a consequence, significant increases in UV-B radiation observed at a few world-wide distributed stations.

This volume contains progress papers in atmospheric ozone research which were presen- ted at the Ouadrennial Ozone symposium held in Greece from 3 to 7 September, 1984. These pa- pers are grouped in nine chapters corresponding to the nine sessions of the symposium. The Editors proVide the following summary of the highlights for each chapter; this summary has been prepared after consulting the papers submitted for publication as well as session summa- ries kindly provided by the following session chairmen: R. Bojkov, H. DOtsch, P. Fabian, J. Hai- gh, I. Isaksen, L. Kaplan, K. KOnzi, J. London, H. Mantis, C. Mateer, A. Matthews, G. Megie and J. Russell. Chapter 1 entitled: Chemical -radiative -dynamical model calculations includes results from recent developments in modeling techniques. The chapter begins with the results from a two -dimensional model using isentropic coordinates. With prescribed diabatic heating rates and a judicious choice of eddy diffusion coefficients this method can produce realistic fields of several stratospheric species. Three dimensional model simulations come next which demon- strate ozone transport by the stationary and transient components of the flow and emphasize the role of wave transport of ozone during a sudden stratospheric warming. The problem of chemical model validation is addressed in several different approaches.

Recent studies have demonstrated a link between ozone changes caused by human activities and changing UV levels at the Earth's surface, as well as a link to climate through changes in radiative forcing and links to changes in chemical composition. This book draws together key scientists who provide state of the art contributions on the variable ozone layer and the interplay of longwave and shortwave radiative interactions which link ozone, the climate and UV issues.

Hellenistic Alexandria: Celebrating 24 Centuries' presents the proceedings of a conference held at the Acropolis Museum in Athens, on December 13-15, 2017, and includes high-level dialogues and philosophical discussions between international experts on Hellenistic Alexandria. The goal was to celebrate the 24 centuries which have elapsed since its foundation and the beginning of the Library and the Museum of Alexandria. The conference was divided into two parts, to include in the first part archaeology, history, philosophy, literature, art, culture and legal issues and in the second part science, medicine, technology and environment. A total of 28 original and peer-reviewed articles point to the importance of the brilliantly-original ideas that emerged during the Hellenistic age and the curious modernity of the whole atmosphere of the time. The range of presented topics covers a variety of new data on the foundation of Alexandria to comparison between Ptolemaic Alexandria and Ptolemaic Greece through philosophy, culture and drama to the forgotten revolution of science, medicine and the prevailing climatological and geophysical conditions throughout the Hellenistic Period. The conference and its proceedings were co-sponsored by the arianna V. Vardinoyannis Foundation, the Acropolis Museum, the Alexandria Center for Hellenistic Studies at Bibliotheca Alexandrina and the Mariolopoulos-Kanaginis Foundation for the Environmental Sciences. The Publication also celebrates the 10th anniversary of the Alexandria Center for Hellenistic Studies, a joint collaboration between the Bibliotheca Alexandrina, the Vardinoyannis Foundation and the University of Alexandria. Scholars from around the world follow the Center's programme in various specialisations, ranging from historyliterature- art, to archaeology and architecture-philosophy, and science.

Alexandria is located on the Mediterranean coast of Egypt, bordered by Egypt's Western Desert and the fertile Nile Delta. For many centuries, Alexandria was the major port city in the Eastern Mediterranean and it has been repeatedly struck by natural disasters, such as earthquakes, tsunamis and land subsidence, in its ~2400-year history. This book focuses on the geomorphological and archaeological evidence on the coastal zone of Alexandria, attempting to provide a comprehensive review of its evolution, taking into consideration long-term and short-term factors. The book provides an extensive background on the geomorphology and recent geoarchaeological history of Alexandria, discussing historical maps and natural disasters. In the coastal area of Alexandria there is numerous archaeological evidence, such as burial sites, quarry activities and ancient building remnants, as well as geomorphological features, all revealing a complex evolution of the coastal zone. New evidence, such as fish tanks and ship wrecks in order to discuss the Late Holocene evolution of the coastal zone. Detailed illustrations and maps accompany the book chapters providing the reader the opportunity to gain an extensive view of Alexandria's features.