In autumn 2005, a joint expedition between the University of Maine and the Institute of Tibetan Plateau Research 
recovered three ice cores from Guoqu Glacier (33°34'37.8"N, 91°10'35.3"E, 5720 m above sea level) on the northern 
side of Mt. Geladaindong, central Tibetan Plateau. Isotopes (d18O), major soluble ions (Na+, K+, Mg2+, Ca2+, 
Cl-, NO3-,SO4 2-), and radionuclide (b-activity) measurements from one of the cores revealed a 70-year record (1935-2005).