Preface to Special Issue on the National Report to the IUGG Centennial by CNC-IAMAS(2011–2018)

The 27th General Assembly of the International Union of Geodesy and Geophysics(IUGG),which also marks the 100th anniversary of IUGG,will be held during 8–18 July 2019 in Montr′eal,Canada.The Chinese National Committee(CNC)for the International Association of Meteorology and Atmospheric Sciences(IAMAS)has a more than 30-year tradition of submitting national reports to the IUGG General Assembly every four years.Since 2004,CNC-IAMAS has published its progress report as a special issue in Advances in Atmospheric Sciences.Three special issues comprising invited reviews written by leading Chinese scientists,published in 2004,2007 and 2012 respectively,have received wide attention and are highly cited.