Daily updates have resumed for the 2020 Greenland melt season, the National Snow and Ice Data Center (NSIDC), based in Boulder, Colorado, announced last month. The open-access information is available for those interested on the NSIDC website for the April through October melt season. The Greenland Ice Sheet Today data collection contains daily, monthly, and annual melt areas for the Greenland Ice Sheet. The data is displayed as an interactive chart where users can select years to compare back to 1979.
The green plot line below represents the 2019 melt year. According to the NSIDC, melting on the Greenland ice sheet for 2019 was the seventh-highest since 1978, behind 2012, 2010, 2016, 2002, 2007, and 2011.
The Greenland ice sheet data is derived from passive microwave sensors, which project data onto a 25-kilometer equal-area grid. Ice monitoring gained a powerful new tool with the launch of ICESat-2 in the fall of 2018. The orbiter uses a laser altimeter to produce imagery with astounding resolution. According to NASA, “With 10,000 laser pulses per second, this fast-shooting laser technology allows ATLAS to take measurements every 28 inches along the satellite’s path.”
Greenland’s ice sheet lost 200 gigatons of ice per year from 2003-2019, mostly from coastal glaciers, due to warmer air and ocean temperatures. One glacier alone lost ~22 gt/yr.— NASA Ice (@NASA_ICE) April 30, 2020
1 gigaton🧊 would fill 400,000 Olympic swimming pools pic.twitter.com/EdGPl8u27X