We describe a radio-echo sounding (RES) survey for the determination of ice thickness, subglacial topography and ice volume of Glacier No. 1 , in Tien Shan, China, using ground-penetrating radar (GPR). Radar data were...We describe a radio-echo sounding (RES) survey for the determination of ice thickness, subglacial topography and ice volume of Glacier No. 1 , in Tien Shan, China, using ground-penetrating radar (GPR). Radar data were collected with 100-MHz antennas that were spaced at 4 m with a step size of 8 m. The images produced from radar survey clearly show the continuity of bedrock echoes and the undulation features of the bedrock surface. Radar results show that the maximum ice thickness of Glacier No. 1 is 133 m, the thickness of the east branch of Glacier No. 1 averages at 58. 77 m while that of the west branch of Glacier No. 1 averages at 44. 84 m. Calculation on ice volume indicates that the ice volume of the east branch of Glacier No. 1 is 51. 87 × 106 m3 and that of the west branch of Glacier No. 1 is 20. 21 × 106 m3. The amplitude of the undulation of the bedrock surface topography revealed by radar profiles is larger than that of the glacier surface topography, indicating that the surface relief does not directly depend on that of the bedrock undulation in Glacier No. 1 , in Tien Shan.展开更多
THE PHILIPPINES The MV Bavaria,a Liberian-flagged container ship,at the Subic Bay Freeport on May 30.It has been commissioned to take truckloads of garbage that Canada transported to the Philippines from 2013 back to ...THE PHILIPPINES The MV Bavaria,a Liberian-flagged container ship,at the Subic Bay Freeport on May 30.It has been commissioned to take truckloads of garbage that Canada transported to the Philippines from 2013 back to Canada.展开更多
基金the National Natural Science Foundation of China(No.40071022)the Ministry of Science and tchnology,the People's Republic of China(No.2001DIA50040)+1 种基金Tien Shan Glacier Station Research FoundationLaboratory foundation of Iee Core and Cold Region Envionment,Cold and Anid Regions Enironmental and Engineeing Insitute,Chinese Academry of Sciences(No.BX2001-04).
文摘We describe a radio-echo sounding (RES) survey for the determination of ice thickness, subglacial topography and ice volume of Glacier No. 1 , in Tien Shan, China, using ground-penetrating radar (GPR). Radar data were collected with 100-MHz antennas that were spaced at 4 m with a step size of 8 m. The images produced from radar survey clearly show the continuity of bedrock echoes and the undulation features of the bedrock surface. Radar results show that the maximum ice thickness of Glacier No. 1 is 133 m, the thickness of the east branch of Glacier No. 1 averages at 58. 77 m while that of the west branch of Glacier No. 1 averages at 44. 84 m. Calculation on ice volume indicates that the ice volume of the east branch of Glacier No. 1 is 51. 87 × 106 m3 and that of the west branch of Glacier No. 1 is 20. 21 × 106 m3. The amplitude of the undulation of the bedrock surface topography revealed by radar profiles is larger than that of the glacier surface topography, indicating that the surface relief does not directly depend on that of the bedrock undulation in Glacier No. 1 , in Tien Shan.
文摘THE PHILIPPINES The MV Bavaria,a Liberian-flagged container ship,at the Subic Bay Freeport on May 30.It has been commissioned to take truckloads of garbage that Canada transported to the Philippines from 2013 back to Canada.
