%0 Journal Article %T Two weather radar time series of the altitude of the volcanic plume during the May 2011 eruption of Gr¨Ēmsv tn, Iceland %A G. N. Petersen %A H. Bjornsson %A P. Arason %A S. von L wis %J Earth System Science Data (ESSD) & Discussions (ESSDD) %D 2012 %I Copernicus Publications %R 10.5194/essd-4-121-2012 %X The eruption of Gr¨Ēmsv tn volcano in Iceland in 2011 lasted for a week, 21¨C28 May. The eruption was explosive and peaked during the first hours, with the eruption plume reaching 20¨C25 km altitude. The height of the plume was monitored every 5 min with a C-band weather radar located at Keflav¨Ēk International Airport and a mobile X-band radar, 257 km and 75 km distance from the volcano respectively. In addition, photographs taken during the first half-hour of the eruption give information regarding the initial rise. Time series of the plume-top altitude were constructed from the radar observations. This paper presents the two independent radar time series. The series have been cross validated and there is a good agreement between them. The echo top radar series of the altitude of the volcanic plume are publicly available from the Pangaea Data Publisher (doi:10.1594/PANGAEA.778390). %U http://www.earth-syst-sci-data.net/4/121/2012/essd-4-121-2012.html