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Professor Costas Varotsos is a Greek physicist (born 14 August 1956) known from his outstanding contribution to the global climate-dynamics research and remote sensing.

Firstly, he became worldwide known from his journal publication about the unprecedented occurrence of the major sudden stratospheric warming over Antarctica in September 2002, an event which resulted in both the smaller-sized ozone hole over Antarctica and its splitting into two holes (see Highlights of United Nations Environmental Programme ). It is noteworthy, that prior to September 2002, it was thought, that a major sudden stratospheric warming could happen only in the Northern Hemisphere. He has announced this extraordinary event before its occurrence in COSPAR Symposium on Natural Hazards Using Space Technology, held in Houston, USA, October 9–19, 2002. His follow-up work on this subject published in highly regarded journals (e.g., Eos Transactions - the official Journal of the American Geophysical Union ; Europhysics News. ) He has been invited by Thomson Reuters Science Watch to comment on his work.

Secondly, he is well-known from his publications on the fractal structure of the total ozone and temperature in the Earth's atmosphere. Specifically, in 2005-2006 he showed that processes based on the nonlinear nature of the atmospheric dynamics could probably address the question “What caused the southern hemisphere to exhibit very strong planetary waves in 2002?” This evidence is based on his new finding that the fluctuations of the total ozone content and temperature exhibit long-range correlations (e.g., see his invited comment in Thomson Reuters Science Watch. )

Thirdly, he is known from his 10 international books (monographs ) published by Springer Publishing during 2000-2013 on the fields of Remote Sensing, Atmospheric Physics & Chemistry, and Environmental change.

He published more than 250 research papers that have received over 5000 citations from other scientists and his h-index in Thomson ISI is 53. In 1989 he established at the National and Kapodistrian University of Athens the Laboratory of the Middle and Upper Atmosphere. This Lab, among others, is routinely operating monitoring stations (of various atmospheric quantities), which belong to International Networks of WMO, UN and EU.

He has been elected Fellow the Royal Meteorological Society, and member of several scientific societies including the American Meteorological Society, the American Geophysical Union, European Geosciences Union several scientific societies in Greece and non-governmental organizations. He coordinated or participated in more than 40 large international research competitive projects, funded by International Organizations (e.g. European Commission, NATO, WMO). He has been appointed as Editor of the “International Journal of Remote Sensing (Taylor & Francis Pub. )” (since January, 2006), Advisor of the “Environmental Science and Pollution Research” (2007-2009), Specialty Chief Editor of “Frontiers in Environmental Science” (Nature Pub. Group). Guest Editor of a number of Journals with peer-reviewing system and member of the Editorial board in a few International Journals (e.g. Current Chemical Research, Atmospheric Pollution Research, The Scientific World Journal). He is reviewer for the Journal of Geophysical Research, Geophysical Research Letters, Atmospheric Environment, and several other international scientific journals. He also served as reviewer of various EU, UN and US Scientific Proposals and Reports. He has been invited from more than 40 International Conferences, Workshops and European Conferences to give talks on the disciplines of his research activity. He has been invited scientist in many Institutions (e.g. Clarendon Laboratory, Department of Atmospheric Physics, Oxford University, UK; University of Maryland, Department of Atmospheric and Oceanic Science, USA(Visiting Professor); NASA Goddard Space Flight Center, USA; Russian Academy of Science, Moscow and St. Petersburg, Russia).