Browsing by Author "Johnson, Erling"
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Item Georeferenciación de datos obtenidos a través de radio eco-sondaje al norte de la península antártica(Universidad de Magallanes, 2011) Cárdenas, Carlos; Carvallo, Rubén; Dodman, Cristian; Johnson, Erling; Hernández, JorgeThis investigation presents data from working with Global Positioning System (GPS) to complement the work of Radio Echo Sounding from January 2009 at the area next to the Chilean Base Station Bernardo O’Higgins and Jakenau Mountain at north of the Antarctic peninsula (63° 19’ S, 57° 51’ W). The main objective was to georeference the information onto crevasses zones identified by Radio Eco Sounding, using two topographic GPS equipment. The measured points correspond to a grid draw on the area that is normally used for Twin Otter aircraft landing thus, surface and subglacier topographyItem Topografía superficial y subglacial de un sector aledaño a la base O'Higgins, ubicada en el extremo norte de la península antártica(Universidad de Magallanes, 2011) Cárdenas, Carlos; Johnson, Erling; Carvallo, RubénIn January 2009, Radio Echo Sounding (RES) measures were made during the campaign in the northern part of the Antarctic Peninsula, at the surroundings of the Chilean Base Bernardo O’Higgins (63° 19’ S; 57° 53’ W). The system has three main components: Transmitter, Receiver and a Data Acquisition System. The transmitting antenna, penetrating the ice and then returning to the receptor after their reflection in an internal target or bedrock, carries out radio frequency signals generated by the transmitter. The records are stored in a data acquisition system for post processing purposes. All radar data collected was georeferenced with post-processed GPS measurements. With the Radar and GPS data we will obtain the surface and subglacial topography.Item Transport of crustal microparticles from Chilean Patagonia to the Antarctic Peninsula by SEM-EDS analysis(Blackwell Munksgaard, 2004) Pereira, Kely Cristine Dalia; Evangelista, Eitor; Pereira, Enio Bueno; Cardia Simoes, Jefferson; Johnson, Erling; Rodrigues Melo, LeticiaThe individual elemental composition of insoluble airborne particulates found in King George Island (KGI), Antarctic Peninsula (atmosphere, snow, firn and ice deposits) and in the atmosphere of Chilean Patagonia by SEM-EDS analysis identify probable sources and transport mechanisms for the atmospheric aerosols observed in these regions. Insoluble airborne particulates found in the snow, firn and ice in a core from Lange Glacier (KGI) call for significant crustal influence, mainly associated with aluminium potassium, aluminium calcium and magnesium iron silicates together with other aluminium silicates of calcium and magnesium, among rare others containing Ti, Ni and Cr. Our study suggests that 95% of the bulk mode insoluble particulates deposited in Lange Glacier can be explained by atmospheric transport from Chilean Patagonia. Cyclonic systems passing between southernmost South America and the Antarctic Peninsula are the most probable atmospheric transport mechanism, tracked by measurements of 222Rn and Si.