CLIMAR Workshops track the progress in marine climatology comprehensively covering scientific, methodological and data management issues of marine climatology (see e.g. Gulev, 2005;Gulev and Woodruff, 2011).Marine climatological data play a crucial role in assessing past and ongoing climate variability and change. Without long-term global and regional time series of marine climatological data, we cannot track global climate and quantify the ocean's role in climate variability and change. Besides estimation of variability of surface state variables, marine climatological data allow for computation of surface air-sea fluxes -the language of ocean and atmosphere communication. Also marine climatological archives provide invaluable contribution to the data assimilated by modern reanalyses, some of which are going back now to the 19th century, documenting the dynamically consistent history of the climate system. Marine climatological records (e.g. information about winds and waves) are also widely used for estimation of extreme events over the ocean, including storminess, storm surges and extreme sea level rise. These phenomena are of great importance for all types of marine structures, including operations of marine carriers and offshore engineering. Finally, marine climatological data provide an important source of in situ information for validation of satellite measurements of surface meteorological variables.