In 1997, three ice cores were recovered from the Dasuopu glacier (28°23'N, 85°43'E) with the use of an electromechanical drill 
in dry holes. The first core (C1) was 159.9 m long and was drilled at 7000 m above sea level (a.s.l.) down the flow line from 
the top of the col, and two cores (C2 and C3), 149.2 and 167.7 m long, respectively, were drilled to bedrock 100 m apart 
on the col at 7200 m a.s.l. Visible stratigraphy showed no hiatus features in any of the cores. All cores were analyzed 
over their entire lengths for oxygen isotopic ratio (d18O), chemical composition, and dust concentration.

References:
Thompson, L.G., T. Yao, E. Mosley-Thompson, M.E. Davis, K.A. Henderson, and P.-N. Lin. 2000. 
A high-resolution millennial record of the South Asian Monsoon from Himalayan ice cores. 
Science, 289, 1916-1919.

Thompson, L.G., E. Mosley-Thompson, M.E. Davis, P.-N. Lin, K. Henderson, and T.A. Mashiotta. 2003. 
Tropical glacier and ice core evidence of climate change on annual to millennial time scales. 
Climatic Change, 59, 137-155.