Two Decades of Global and Regional Sea Level Observations from the ESA Climate Change Initiative Sea Level Project

Wednesday, 17 December 2014: 8:00 AM
Jerome Benveniste1, Gilles Larnicol2, Anny A Cazenave3, Michael Ablain2, Jean-François Legeais2, Yannice Faugère2, Bruno Lucas4, Salvatore Dinardo5, Johnny A Johannessen6, Detlef Stammer7, Gary Timms8, Per Knudsen9, Paolo Cipollini10, Mònica Roca11, Sergei Rudenko12, Joana Fernandes13, Magdalena Balmaseda14, Graham Quartly15, Luciana Fenoglio-Marc16 and Thierry Guinle17, (1)ESA ESRIN, Frascati, Italy, (2)CLS, Toulouse, France, (3)LEGOS, Toulouse, France, (4)ESA ESRIN, DEIMOS, Frascati, Italy, (5)ESA ESRIN, SERCO, Frascati, Italy, (6)Nansen Environmental and Remote Sensing Center, Bergen, Norway, (7)University of Hamburg, Hamburg, Germany, (8)CGI, Leatherhead, United Kingdom, (9)Technical University of Denmark - Space, Kongens Lyngby, Denmark, (10)National Oceanography Centre, Southampton, United Kingdom, (11)isardSAT, Barcelona, Spain, (12)GFZ, Wessling, Germany, (13)University of Porto, Porto, Portugal, (14)ECMWF, Reading, United Kingdom, (15)Plymouth Marine Laboratory, Plymouth, United Kingdom, (16)Technical University Darmstadt, Darmstadt, Germany, (17)CNES French National Center for Space Studies, Toulouse Cedex 09, France
Sea level is a very sensitive index of climate change and variability. Sea level integrates the ocean warming, mountain glaciers and ice sheet melting. Understanding the sea level variability and changes implies an accurate monitoring of the sea level variable at climate scales, in addition to understanding the ocean variability and the exchanges between ocean, land, cryosphere, and atmosphere. That is why Sea Level is one of the Essential Climate Variables (ECV) selected in the frame of the ESA Climate Change Initiative (CCI) program. It aims at providing long-term monitoring of the sea level ECV with regular updates, as required for climate studies. The program has just completed its first phase (Oct. 2010 to Dec. 2013) and has started in February 2014 the second phase of 3 years. The objectives of the second phase are to involve the climate research community, to refine their needs and collect their feedbacks on product quality, to develop, test and select the best algorithms and standards to generate an updated climate time series and to produce and validate the Sea Level ECV product. This will better answer the climate user needs by improving the quality of the Sea Level products and maintain a sustain service for an up-to-date production. To this extent, a temporal extension of the ECV will be delivered at the end of 2014 so that the covered period becomes 1993-2013.

We will firstly present the main achievements of the ESA CCI Sea Level Project. On the one hand, the major steps required to produce the 18 years climate time series (delivered in Sept. 2012) are briefly described: collect and refine the user requirements, development of adapted algorithms for climate applications and specification of the production system. On the other hand, the product characteristics are described as well as the results from product validation, performed by several groups of the ocean and climate modeling community. At last, the work plan and key challenges of the second phase of the project are described.