Climate change, ocean warming, land ice melt and sea level rise
About the Event:
It is now well established that the Earth‘s climate is warming and that the main reason is the accumulation inside the atmosphere of green house gases produced by anthropogenic fossil fuel combustion and change in land use. Global warming has already several visible consequences, in particular increase of the Earth’s mean temperature and of ocean heat content, melting of glaciers, and ice mass loss from the Greenland and Antarctica ice sheets. Ocean warming causes thermal expansion of sea waters, hence sea level rise. Similarly, land ice melt that ultimately reaches the oceans, also causes sea level to rise. In this presentation, we summarize the most up-to-date knowledge about climate change and associated impacts on ocean warming, land ice melt and sea level rise. We highlight the contribution of space data, in particular satellite altimetry and space gravimetry, to measure ice sheet mass loss and sea level rise. We also discuss the various causes of sea level rise at global and regional scales and show that in terms of global average, we are now able to close the sea level budget. Finally, we discuss the importance of measuring sea level change at the coast, as well as the many complex processes at work in such regions (due to natural phenomena and anthropogenic forcing) that cause important adverse effects and significant vulnerability.
About the Speaker:
Anny Cazenave is a senior scientist at the ‘Laboratoire d’Etudes en Géophysique et Océanographie Spatiale’, ‘Centre National d’Etudes Spatiales’, Toulouse, France, and director for Earth sciences at the International Space Science Institute/ISSI, Bern, Switzerland. Her research deals with the applications of space techniques to geosciences (geodesy, gravity and solid Earth geophysics; sea level variations from satellite altimetry and study of climatic causes; global water cycle and land hydrology from space; climate research). She published 250 articles in international journals and edited several books. She contributed as P.I. or co-I in several space missions in geodesy and oceanography. She served in several national and international scientific committees (e.g., World Climate Research Programme/WCRP, “Future Earth”, European Research Council/ERC Advanced Grants, US National Research Council/NRC), and was lead author of the IPCC (Intergovernmental Panel on Climate Change) Working Group I (4th and 5th Assessment reports). She is Fellow of the American Geophysical Union and the American Association for the Advancement of Science. She is member of the French Academy of sciences and foreign member of the American, Indian and Belgium academies of sciences.