报告人：Sergey Popov(副教授)

时间：2023.7.10 9:30-11:30

地点：测绘馆401会议室

报告人简介

  Dr. Sergey Popov is a leading geophysicist of the Antarctic Division of the Polar Marine Geosurvey Expedition, Russia, also associate professor of Saint Petersburg State University. For thirty years he studies Antarctica by radio-echo sounding and GPR, also subglacial lakes especially Lake Vostok.

报告简介

     This lecture focused on the results of Russian airborne radio-echo sounding (RES) investigations and also seismic reflection soundings carried out in 1971–2023 over a vast area of the coastal part of East Antarctica. It is the first comprehensive summary mapping of these data. Field research, equipment, errors of initial RES data, and methods of gridding are discussed. Ice thickness, ice base elevation, and bedrock topography are presented. The ice thickness across the research area varies from a few meters to 3620 m, and is greatest in the local subglacial depressions. The average thickness is about 1220 m. The total volume of the ice is about 710,500 km³. The bedrock heights vary from 2860 m below sea level in the ocean bathyal zone to 2040 m above sea level in the Grove Mountains area 4900 m. The bottom melting rate was estimated on the basis of the simple Zotikov model. The total annual melting under the study area is about 0.633 km³. The total annual melting in the study area is approximately 1.5 mm/yr.