Speaker: Dr. Dorothy Hall, Cryospheric Sciences Laboratory, NASA / GSFC
Title: Measuring surface temperature in the Cryosphere from space
Time: 10:30 – 11:30 am ET on Friday 10-October 2014
Location: NOAA Great Lakes Environmental Research Lab, 4840 South State Road, Ann Arbor, MI 48108
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Abstract: Surface temperature measurements from space can provide accurate and consistent measurements of cryospheric features under clear-sky conditions. These measurements are useful for climate and modeling studies as well as for some applications. Moderate-Resolution Imaging Spectroradiometer (MODIS) data, available since February of 2000, have been used to develop ice-surface temperature (IST) products of the Greenland ice sheet, polar sea ice and the Great Lakes. 14-yr trends in the clear-sky IST and melt extent of the Greenland ice sheet show increasing surface temperatures over most of the ice sheet. Over sea ice, the IST-derived temperature of ice and open water adjacent to sea ice has helped to document enhanced melting of sea ice in the 2012 spring/summer when the Arctic sea ice extent hit a record low. IST maps of the Great Lakes for the winter of 2012-13 show both the ice and adjacent water temperature providing insight into ice formation and breakup. The validation and consistency of the MODIS IST record reveals excellent correspondence with measured surface temperature at “high” temperatures, near 0°C, but the accuracy decreases as ice temperatures drop.