Diurnal, Seasonal and Interannual Variations of Surface Temperature Over Greenland As Observed In AIRS, MODIS and In-Situ Measurements

Friday, 19 December 2014
Jae N Lee, University of Maryland Baltimore County, Baltimore, MD, United States, Joel Susskind, NASA-GSFC, Greenbelt, MD, United States, Dong Liang Wu, NASA/Goddard Space Flight Cent, Greenbelt, MD, United States, Lena Fornito Iredell, Science Applications International Corporation Greenbelt, Greenbelt, MD, United States, Sophie Nowicki, NASA GSFC, Greenbelt, MD, United States, Dorothy K Hall, NASA Goddard Space Flight Center, Cryospheric Sciences Laboratory, Greenbelt, MD, United States and Yuping Liu, SSAI, Greenbelt, MD, United States
The near surface temperature record is an important indicator of Greenland ice mass loss. During the summer of 2012, almost the entirety of the Greenland ice sheet simultaneously experienced surface melt, including Summit. In this presentation, we will show the spatial distribution of the seasonal and interannual variability of surface skin and surface air temperatures (Ts and Ta) as depicted in the AIRS Version-6 data set for the 12 year period since 2002 to present. We will compare these variability with those obtained from MODIS Ice Surface Temperature (IST), and from two in situ stations at Summit.

The comparison between AIRS Ts and MODIS IST is in good agreement within ~3K during the summer season (JJA) except near the coast. The differences are most pronounced during the winter season (DJF), in the south of the Greenland near the coast, as MODIS IST is more than 10K lower than AIRS Ts. The temporal correlation at Summit between two temperature data set is ~0.85 during 10 years of analysis period. Large seasonal dependence on diurnal variability is found over Summit. The most significant diurnal variation is found during warm season (March to August), when interannual variability is low.